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1.
Rev. Asoc. Odontol. Argent ; 109(1): 3-8, ene.-abr. 2021. ilus, tab, graf
Article in Spanish | LILACS | ID: biblio-1255177

ABSTRACT

Objetivo: Comparar clínicamente el comportamiento, el tiempo operatorio requerido, el costo y la dificultad de diferentes técnicas de restauración en piezas primarias, empleando ionómero vítreo fotoactivado (IVF) polvo/líquido, con y sin uso de acondicionamiento dentinario, y en cápsulas, con acondicionamiento. Materiales y métodos: El diseño de este estudio fue experimental y comparativo. Se realizaron, en 18 pacientes de 7±2 años, 33 restauraciones con IVF de una o más piezas primarias vitales con lesiones amelodentinarias en 1 o 2 superficies. Según su día de concurrencia a la Cátedra de Odontología Integral Niños, se empleó: A) IVF polvo/líquido, con acondicionamiento (3M™ VitremerTM); B) IVF polvo/líquido, sin acondicionamiento (3M™ VitremerTM); y C) IVF en cápsulas, con acondicionamiento (Riva Light Cure). Las restauraciones fueron evaluadas clínicamente al inicio y a los 12 meses según los siguientes criterios: pérdida total, pérdida total con caries, requerimiento de reemplazo por pérdida parcial, requerimiento de reemplazo por caries, aceptable con deterioro, en condiciones. El grado de dificultad se analizó utilizando una planilla diseñada para tal fin. El tiempo operatorio requerido se midió sin considerar el tiempo de inserción. Resultados: El tiempo operatorio requerido fue de 2 minutos, 15 segundos en A; 1 minuto, 25 segundos en B; y 1 minuto, 10 segundos en C, sin considerar el tiempo de inserción. El costo fue 61,11% mayor para C. La dificultad fue de 3,2±0,6 para A y B, y de 1,5±0,7 para C (ANOVA; P<0,001). El comportamiento clínico no registró diferencias significativas entre los grupos (Fisher; P=0,339). Conclusión: Los ionómeros de restauración fotoactivados encapsulados utilizados en este estudio presentaron menor dificultad de manipulación, mayor costo y similar comportamiento clínico a un año que las presentaciones polvo-líquido, con o sin uso de acondicionamiento previo en piezas primarias (AU)


Aim: To assess the clinical performance, operative time required, cost and technical difficulties of different restorative techniques in primary teeth, using light cured glass ionomers (LCG), powder/liquid, with and without dentin conditioning and light cured glass ionomer in capsules with conditioning. Materials and methods: The design of this study was experimental and comparative. 33 restorations with LCG were performed in 18 patients, 7 ± 2-years-old, in one or more vital primary teeth with carious lesions involving one or more tooth surfaces. Patients were assigned to one of the three groups according to the day of the week in which they attended to the Pediatric Department of the Dental School: A) LCG powder/liquid, with conditioning (3M™ VitremerTM); B) LCG powder/liquid without conditioning (3M™ VitremerTM); and C) LCG in capsules with conditioning (Riva Light Cure). The restorations were clinically evaluated at baseline and after 12 months according to the following criteria: complete loss of the restoration, complete loss with caries, need of replacement because of partial loss, need of replacement because of caries, good condition with some wear and good condition. Technical difficulties were analyzed using a data sheet designed for that purpose. The operative time required was evaluated without considering the insertion time. Results: Time operative time required was 2 minutes 15 seconds in A, 1 minute 25 seconds in B and 1 minute 10 seconds in C. Cost was 61.11% higher for C. Difficulty was 3.2±0.6 for A and B and 1.5±0.7 for C (ANOVA; P<0.001). No significant differences were observed among the three groups in relation to the clinical performance (Fisher; P=0.339). Conclusions: In these 12 months, study in primary teeth, the light cured glass ionomers used dispensed in capsules showed to be the easiest to handle, had higher cost and similar clinical performance than the powder liquid presentations with and without dentin conditioner (AU)


Subject(s)
Humans , Male , Female , Child, Preschool , Child , Tooth, Deciduous , Dentin-Bonding Agents , Dental Care for Children/methods , Dental Restoration, Permanent/methods , Glass Ionomer Cements/therapeutic use , Argentina , Schools, Dental , Statistical Analysis , Prospective Studies , Analysis of Variance , Clinical Trial , Costs and Cost Analysis , Light-Curing of Dental Adhesives , Time-to-Treatment
2.
Rev. Fac. Odontol. (B.Aires) ; 36(82): 21-26, 2021. ilus
Article in Spanish | LILACS | ID: biblio-1290951

ABSTRACT

El objetivo de este artículo es presentar una alternativa de tratamiento rehabilitador para pacientes jóvenes con gran pérdida de estructura dental vinculada a lesiones de origen no bacteriano. Se presenta el caso clínico de un paciente de 36 años de edad, con reflujo gastroesofágico crónico bajo tratamiento médico, que concurrió a la Cátedra de Odontología Integral Adultos de la Facultad de Odontología de la Universidad de Buenos Aires (FOUBA), en busca de un cambio estético en su sonrisa y relatando sensibilidad al calor, al frío y dolor al masticar. No manifestó sintomatología dolorosa a nivel muscular ni articular. En función de sus posibilidades económicas y de la etiología erosiva de las lesiones existentes en sus piezas dentarias, se llevó a cabo una rehabilitación oral adhesiva con resinas compuestas utilizando la sistematización de atención que sugiere la Cátedra. Las resinas compuestas actuales, en combinación con las técnicas y procedimientos desarrollados en este artículo han demostrado un adecuado comportamiento al ser utilizadas como restauraciones definitivas en pacientes que necesitan rehabilitación oral total debido a la gran pérdida de estructura dental por erosión ácida (AU)


Subject(s)
Humans , Male , Adult , Tooth Erosion/therapy , Dental Bonding , Composite Resins/therapeutic use , Argentina , Schools, Dental , Gastroesophageal Reflux/complications , Dental Restoration, Permanent/methods , Mouth Rehabilitation
3.
Rev. Fac. Odontol. Porto Alegre ; 61(2): 50-63, jul-dez. 2020.
Article in English | LILACS, BBO | ID: biblio-1281698

ABSTRACT

Objetivo: Este ensaio clínico randomizado avaliou o comportamento de restaurações com resina composta bulk-fill flow em dentes posteriores após três anos do tratamento restaurador. Métodos: Dezessete pacientes (12 mulheres, 5 homens, idade 23-59) foram selecionados para ter pelo menos duas restaurações de amálgama ou de resina composta substituídas, ou receber tratamento restaurador para lesão cariosa. As cavidades foram aleatoriamente alocadas para receberem o compósito bulk-fill flow Suferil SDR Flow, oclusamente coberto por uma resina composta convencional nano-híbrida Esthet-X HD (técnica bulk and body), ou serem preenchidas exclusivamente com Esthet-X HD, inseridas em incrementos de 2mm cada técnica incremental). Um adesivo convencional de dois passos foi aplicado em todas as cavidades. Trinta e quatro restaurações Classes I ou II foram realizados em dentes posteriores (n=17) no início do estudo (baseline). Após 03 anos, os critérios do USPHS modificado e FDI foram utilizados para avaliar as restaurações. Os dados foram submetidos à análise estatística Mann-Whitney (p<0,05). Resultados: No acompanhamento de 3 anos, vinte e quatro restaurações (17 Classes I e 7 Classes II) foram avaliadas. Não foram detectadas diferenças entre as técnicas restauradoras (p>0,05). Não houve falha em nenhuma restauração ao longo do tempo. Conclusão: Após 03 anos de serviço clínico, todas restaurações utilizando um compósito bulk-fill flow em dentes posteriores demonstraram uma performance satisfatória. Significância Clínica: A qualidade geral das restaurações em dentes posteriores realizadas com a técnica bulk and body foi similar ao das restaurações incrementais utilizando um compósito nano-híbrido. (AU)


Objective: This randomized clinical trial evaluated the behavior of restorations with flowable bulk-fill resin composite in posterior teeth three years after the restorative treatment. Methods: Seventeen patients (12 women, 5 men, age 23-59) were selected to have at least two failing amalgam or resin restorations replaced and/or to have a carious lesion restored. The cavities were randomly allocated to receive either the flowable bulk-fill composite Surefil SDR Flow occlusally covered with the conventional nano-hybrid composite Esthet-X HD (bulk and body technique) or filled exclusively with Esthet-X HD placed in 2 mm increments (incremental technique). A two-step etch-and-rinse adhesive was applied in all cavities. Thirty-four Class I or II restorations were performed in posterior teeth (n=17) during baseline. After 03 years, modified USPHS and FDI criteria were used to evaluate the restorations. Data were subjected to Mann-Whitney statistical analysis (p<0.05). Results: At the 3-year follow-up, twenty-four restorations (17 Class I and 7 Class II) were evaluated. No diff erences were detected between the bulk and body and the incremental restorations (p>0.05). No restoration failures were observed over time. Conclusion: After 03 years of clinical service, all restorations using a flowable bulk-fill composite in posterior teeth showed an acceptable performance. Clinical Significance: The overall quality of posterior restorations made with the bulk and body technique was similar to that of restorations made with a nano-hybrid composite incrementally placed. (AU)


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Young Adult , Composite Resins , Dental Restoration, Permanent/methods , Bicuspid , Double-Blind Method , Follow-Up Studies , Statistics, Nonparametric , Molar
5.
Int. j. odontostomatol. (Print) ; 14(1): 73-80, mar. 2020. graf
Article in Spanish | LILACS | ID: biblio-1056504

ABSTRACT

RESUMEN: La rehabilitación oral tradicional del paciente con mordida profunda y braquifacial puede ser muy compleja e invasiva, sin embargo, podría involucrar muchas especialidades para su resolución ideal. Un análisis integral estético-oclusal es necesario antes de empezar el tratamiento para hacer propuestas con el menor costo biológico, de tiempo y económico. La odontología adhesiva permite una propuesta aditiva y no invasiva como un tratamiento de mediano plazo o transitorio. Este artículo presenta un caso de una paciente de 46años de edad con mordida profunda anterior y desgaste dental severo en las caras palatinas de los dientes antero-superiores, sin disfunción temporomandibular, ni compromisos sistémicos. Se destaca la rehabilitación estética- oclusal con el mínimo compromiso biológico (ultra-conservadora), mediante restauraciones adhesivas semi-indirectas de resina compuesta con acompañamiento de 12meses. Esta propuesta rehabilitadora con resinas compuestas representa una alternativa de tratamiento para el manejo del paciente con mordida profunda anterior. El control a un año de tratamiento demostró que se siguió una secuencia y resolución que aseguró los principios de la rehabilitación oral, al mismo tiempo, se procedió de la manera menos invasiva posible.


ABSTRACT: The traditional oral rehabilitation of the patient with deep bite and brachifacial can be very complex and invasive, however, a number of treatments could be considered to improve rehabilitation. A comprehensive aesthetic-occlusal analysis is necessary prior to starting treatment in order to consider the best procedure, time involved, and economic cost. Adhesive dentistry allows an additive and non-invasive proposal as a medium-term or transitory treatment. A case of a 46-year-old patient is presented, with anterior deep bite and severe dental wear on palatal surfaces of the antero-superior teeth, without temporomandibular dysfunction, or systemic compromises. The objective was to emphasize the aesthetic and occlusal rehabilitation with the least biological commitment (ultraconservative), through semi-indirect adhesive restorations of composite resin with 12 months follow-up. This restorative proposal with composite resins represents an alternative treatment for patient management with anterior deep bite. Control at one year of treatment showed that a sequence and resolution was followed, that ensured adequate oral rehabilitation in the least invasive manner possible.


Subject(s)
Humans , Female , Middle Aged , Composite Resins/administration & dosage , Composite Resins/therapeutic use , Dental Occlusion , Dental Restoration, Permanent/methods , Dental Cements/therapeutic use , Esthetics, Dental , Tooth Wear/therapy , Overbite/pathology
6.
Int. j. odontostomatol. (Print) ; 14(1): 60-66, mar. 2020. tab, graf
Article in English | LILACS | ID: biblio-1056502

ABSTRACT

ABSTRACT: The objective of the study was to evaluate marginal adaptation of Class II mesial-occlusal-distal (MOD) restorations before and after thermo-mechanical loading and volumetric shrinkage of the bulk-fill vs conventional composite resin. For marginal adaptation assessment, 24 Class II MOD cavities with cervical margins extending 1.0 mm below (distal) and 1.0 mm beyond (mesial) the cement-enamel junction were prepared in extracted human molars. The teeth were filled as follows: Group A - bulk-fill with SureFil SDR flow (first increment, 4 mm; second increment, 2 mm); Group B - bulk-fill with SureFil SDR flow as a base (first increment, 4 mm) and covered with the conventional nanohybrid composite Esthet-X HD (second increment, 2 mm); and Group C - incrementally filled with Esthet-X HD. Marginal adaptation was evaluated by scanning electron microscopy before and after thermomechanical loading (240,000 loading cycles and simultaneous 600 thermal cycles). To evaluate volumetric polymerization shrinkage, a semi-spherical mold was filled with the tested composites and placed in an AccuVol device after light curing. Both before and after loading, marginal adaptation in cervical dentin was superior (p < 0.05) for Groups A and B compared with Group C. In cervical enamel, Group B showed better marginal adaptation than Group C, and Group A presented intermediary results, between Groups B and C. Furthermore, bulk-fill flow resulted in greater shrinkage than Esthet-X HD. A significant improvement of marginal adaptation was observed when bulkfill flow was used instead of conventional composite resin both before and after thermomechanical loading. However, the bulk-fill flow presented higher volumetric polymerization shrinkage than the conventional composite.


RESUMEN: El objetivo de este trabajo consistió en evaluar la adaptación marginal de las restauraciones mesiales-oclusales-distales (MOD) de Clase II antes y después de la carga termo-mecánica y la contracción volumétrica de la carga compuesta de resina "bulk-fill" en comparación con resina convencional. Para la evaluación de adaptación, se prepararon 24 cavidades MOD de Clase II en molares humanos extraídos, los que se restauraron de la siguiente manera: Grupo A: restaurado con resina fluida Bulk-Fill SureFilSDR (primer incremento, 4 mm; segundo incremento, 2 mm); Grupo B: restaurado con resina fluida Bulk-Fill SureFil SDR (primer incremento, 4 mm) y cubierto con resina compuesta nanohíbrida Esthet-X HD (segundo incremento, 2 mm); y Grupo C - rellenado incrementalmente con Esthet-X HD. La adaptación marginal se evaluó mediante microscopía electrónica de barrido antes y después de la carga termomecánica (240.000 ciclos de carga y 600 ciclos térmicos simultáneos). Para evaluar la contracción volumétrica de la polimerización, se llenó un molde semiesférico con los compuestos probados y se colocó en un dispositivo AccuVol después del fotopolimerización. Tanto antes como después de la carga, la adaptación marginal en la dentina cervical fue superior (p <0,05) para los grupos A y B en comparación con el grupo C. En el esmalte cervical, el grupo B mostró una mejor adaptación marginal que el grupo C, y el grupo A presentó resultados intermedios, entre Grupos B y C. Se observó una mejora significativa de la adaptación marginal al utilizar la resina fluida Bulk-Fill en lugar de resina compuesta convencional tanto antes como después de la carga termomecánica. Sin embargo, la resina fluida 'Bulk-Fill' presentó una mayor contracción volumétrica de polimerización que el compuesto convencional.


Subject(s)
Humans , Dental Marginal Adaptation , Composite Resins , Dental Cavity Preparation/instrumentation , Dental Restoration, Permanent/methods , Malocclusion, Angle Class II , Stress, Mechanical , Statistical Analysis , Ethics Committees , Dental Restoration Wear , Dental Cavity Preparation/standards , Polymerization
7.
J. appl. oral sci ; 28: e20190042, 2020. graf
Article in English | LILACS, BBO | ID: biblio-1056592

ABSTRACT

Abstract Gap formation of composite resin restorations is a serious shortcoming in clinical practice. Polymerization shrinkage stress exceeds the tooth-restoration bond strength, and it causes bacterial infiltration within gaps between cavity walls and the restorative material. Thus, an intermediate liner application with a low elastic modulus has been advised to minimize polymerization shrinkage as well as gap formation. Objective: The purpose of this in vitro study was to assess gap formation volume in premolars restored with different bulk-fill composites, with and without a resin-modified glass-ionomer cement (RMGIC) liner, using x-ray micro-computed tomography (micro-CT). Methodology: Sixty extracted human maxillary premolars were divided into six groups according to bucco-palatal dimensions (n=10). Standardized Class II mesio-occluso-distal cavities were prepared. G-Premio Bond (GC Corp., Japan) was applied in the selective-etch mode. Teeth were restored with high-viscosity (Filtek Bulk Fill, 3M ESPE, USA)-FB, sonic-activated (SonicFill 2, Kerr, USA)-SF and low viscosity (Estelite Bulk Fill Flow, Tokuyama, Japan)-EB bulk-fill composites, with and without a liner (Ionoseal, Voco GmbH, Germany)-L. The specimens were subjected to 10,000 thermocycles (5-55°C) and 50,000 simulated chewing cycles (100 N). Gap formation based on the volume of black spaces at the tooth-restoration interface was quantified in mm3 using micro-computed tomography (SkyScan, Belgium), and analyses were performed. Data were analyzed using repeated-measures ANOVA and the Bonferroni correction test (p < 0.05). Results: The gap volume of all tested bulk-fill composites demonstrated that Group SF (1.581±0.773) had significantly higher values than Group EB (0.717±0.679). Regarding the use of a liner, a significant reduction in gap formation volume was observed only in Group SFL (0.927±0.630) compared with Group SF (1.581±0.773). Conclusion: It can be concluded that different types of bulk-fill composite resins affected gap formation volume. Low-viscosity bulk-fill composites exhibited better adaptation to cavity walls and less gap formation than did sonic-activated bulk-fill composites. The use of an RMGIC liner produced a significant reduction in gap formation volume for sonic-activated bulk-fill composites.


Subject(s)
Humans , Composite Resins/chemistry , Imaging, Three-Dimensional/methods , Dental Cavity Preparation/methods , Dental Materials/chemistry , Dental Restoration, Permanent/methods , Polymerization , In Vitro Techniques , Materials Testing , Resin Cements , Dental Stress Analysis , X-Ray Microtomography
8.
J. appl. oral sci ; 28: e20190544, 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1101250

ABSTRACT

Abstract Objective To evaluate the influence of three levels of dental structure loss on stress distribution and bite load in root canal-treated young molar teeth that were filled with bulk-fill resin composite, using finite element analysis (FEA) to predict clinical failure. Methodology Three first mandibular molars with extensive caries lesions were selected in teenager patients. The habitual occlusion bite force was measured using gnathodynamometer before and after endodontic/restoration procedures. The recorded bite forces were used as input for patient-specific FEA models, generated from cone-beam computed tomographic (CT) scans of the teeth before and after treatment. Loads were simulated using the contact loading of the antagonist molars selected based on the CT scans and clinical evaluation. Pre and post treatment bite forces (N) in the 3 patients were 30.1/136.6, 34.3/133.4, and 47.9/124.1. Results Bite force increased 260% (from 36.7±11.6 to 131.9±17.8 N) after endodontic and direct restoration. Before endodontic intervention, the stress concentration was located in coronal tooth structure; after rehabilitation, the stresses were located in root dentin, regardless of the level of tooth structure loss. The bite force used on molar teeth after pulp removal during endodontic treatment resulted in high stress concentrations in weakened tooth areas and at the furcation. Conclusion Extensive caries negatively affected the bite force. After pulp removal and endodontic treatment, stress and strain concentrations were higher in the weakened dental structure. Root canal treatment associated with direct resin composite restorative procedure could restore the stress-strain conditions in permanent young molar teeth.


Subject(s)
Humans , Child , Bite Force , Composite Resins/chemistry , Tooth, Nonvital/therapy , Dental Restoration, Permanent/methods , Molar , Reference Values , Tensile Strength , Reproducibility of Results , Treatment Outcome , Composite Resins/therapeutic use , Tooth, Nonvital/diagnostic imaging , Compressive Strength , Finite Element Analysis , Dental Stress Analysis , Cone-Beam Computed Tomography , Elastic Modulus , Patient-Specific Modeling
9.
Rev. Ciênc. Plur ; 6(3): 255-264, 2020. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1128187

ABSTRACT

ntrodução:Pacientes com dentes curtos e ameias abertas, relatam muita insatisfação com seusorriso.A gengivoplastia, quando bem indicada, permite oaumento no tamanho da coroa dentária de forma a reduzir a necessidade de aumento incisal com resina composta. A reanatomização com resinas compostas para fechamento de ameias e aumentosincisais representa uma alternativa conservadora, pois trata-se de uma técnicaadesiva diretaque pode ser realizada sem nenhum desgaste dentário. Além disso é uma técnica reversível preferível para pacientes jovens. Objetivo:Apresentar um relato de caso clínico de paciente do sexo masculino, 22 anos, insatisfeito com o tamanho, cor e a forma dos seus dentes anteriores. Descrição do Caso:Ao exame clínico foi observado coroa curta, escurecimento fisiológico, espaços interdentais e desalinhamento das bordas incisais. O plano de tratamento proposto foi encaminhar para a gengivoplastia, clareamento dental pela técnica associada e reanatomização estética dos dentes anteriores com resinacomposta diretaestratificada com diferentescamadas e cores, e posterior texturização superficialdurante as fases de acabamento e polimento finais. Conclusões:Com a gengivoplastiae asrestaurações, obtivemos dentes reanatomizados, reproduzindo naturalidadede forma, textura e cor. Com planejamento e técnica adequada, foi possível restabelecer o sorriso comproporções, forma e naturalidade satisfatórias (AU).


Introduction:Patients with short teeth and open battlements, report a lot of dissatisfaction with their smile. Gingivoplasty, when properly indicated, allows for an increase in the size of the dental crown in order to reduce the need for incisal augmentation with composite resin. Resuscitation with composite resins for the closure of niches and incisal increases represents a conservative alternative, as it is a direct adhesive technique that can be performed without any dental wear. Furthermore, it is a preferable reversible technique for young patients.Objective:To present a case report of a 22-year-old male patient, dissatisfied with the size, color and shape of his anterior teeth.Case Description:The clinical examination showed a short crown, physiological darkening, interdental spaces and misalignment of the incisal edges. The proposed treatment plan was to refer to gingivoplasty, tooth whitening by the associated technique and aesthetic reanatomization of the anterior teeth with stratified direct composite resin with different layers and colors, and later surface texturing during the final polishing and finishing phases. Conclusions:With gingivoplastyand restorations, we obtained reanatomized teeth, reproducing natural form, texture and color. With proper planning and technique, it was possible to restore the smile with satisfactory proportions, shape and naturalness (AU).


Introducción: Los pacientes com dientescortos y almenasabiertas, informanmuchainsatisfaccióncom susonrisa. La gingivoplastia, cuando está indicada adecuadamente, permite un aumento em eltamaño de la corona dental para reducirlanecesidad de aumento incisalcon resina compuesta. La rstauración con resinas compuestas para elcierre de nichos y aumentos incisales representa una alternativa conservadora, ya que es una técnica adesiva directa que se puede realizar sinningún tipo de desgaste dental. Además, es una técnica reversiblepreferible para pacientes jóvenes. Objetivo: Presentar un informe de caso de un paciente masculino de 22 años, insatisfechocom eltamaño, el color y la forma de sus dientes anteriores.Descripcióndel caso:El examen clínico mostró una corona corta, oscurecimiento fisiológico, espaciosinterdentales y desalineación de los bordes incisales. El plan de tratamento propuesto era referirse a lagingivoplastia, elblanqueamiento dental mediante la técnica asociada y lareanatización estética de losdientes anteriores con resina compuestadirecta estratificada con diferentes capas y colores, y luego texturizar lasuperficie durante las fases finales de pulido y acabado. Conclusiones: Com lagingivoplasty yrestauracióndental, obtuvimosdientesreanatomizados, reproduciendo forma, textura y color naturales. Con una planificación y técnica adecuadas, fueposible restaurar lasonrisacon proporciones, forma y naturalidade satisfactorias (AU).


Subject(s)
Tooth Bleaching , Adhesiveness , Dental Restoration, Permanent/methods , Tooth Bleaching Agents , Gingivoplasty , Brazil , Photography, Dental/instrumentation
10.
Rev. Ciênc. Plur ; 6(3): 230-238, 2020. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1128145

ABSTRACT

Introdução:A melhoria da qualidade dos materiaisrestauradores odontológicos, sobretudo dasresinascompostas,permitiu a resolução de diversos problemas estéticos de forma conservadora, rápida e satisfatória.Objetivo:Este trabalho objetivou relatar um caso clínico de alteração de forma dos dentes anteriores, solucionado com resina composta pela técnica direta.Descrição do Caso:A paciente apresentava incisivos laterais ovalados e restauração classe IV insatisfatória no incisivo central superior direito.Após exame clínico e seleção de cor, os dentes 12, 12, 21 e 22 foram reanatomizadoscom resina composta direta através da técnica estratificada, além da substituição da restauração classe IV.Para uma perfeita mimetização dos elementos dentários, foram utilizadas resinas translúcidas, opacas e de efeito opalescente, além de resinas para reproduzir as camadas de esmalte e dentina. Conclusões:Uma boa seleção do material e aplicação correta da técnica,permitemrestaurações imperceptíveis,com excelente nível de texturização, acabamento e polimento, devolvendo a harmonia do sorriso (AU).


ntroduction:Theimprovement of the quality of dental restorative materials, especially of composite resins, allowed the resolution of several aesthetic problems in a conservative, fast and satisfactory way.Objective:This study aimed to report a clinical case of alteration of the shape of the anterior teeth, solved with resin composed by the direct technique. Case Description:The patient had oval lateral incisors and an unsatisfactory class IV restoration on the upper right central incisor. After clinical examination and color selection, teeth 12, 12, 21 and 22 were reanatomized with direct composite resin using the stratified technique, in addition to replacing the class IV restoration. For perfect mimicry of dental elements, translucent, opaque and opalescent resins were used, in addition to resins to reproduce the enamel and dentin layers.Conclusions:A good selection of the material and correct application of the technique, allow imperceptible restorations, with an excellent level of texturing, finishing and polishing, returning the harmony of the smile (AU).


Introducción: La mejora de lacalidad de losmateriales de restauración dental, especialmente de las resinas compuestas, permitiólaresolución de varios problemas estéticos de forma conservadora, rápida y satisfactoria. Objetivo: Este estudio tuvo como objetivo informar un caso clínico de alteración de la forma de los dientes anteriores, resuelto con resina compuesta por latécnica directa.Descripcióndel caso: El paciente tenía incisivos laterales ovales y una restauración de clase IV insatisfactoria en el incisivo central superior derecho. Después del examen clínico y la selección del color, los dientes 12, 12, 21 y 22 sereanatomizaron con resina compuesta directa utilizando la técnica estratificada, además de reemplazar la restauración de clase IV. Para una perfecta imitación de los elementos dentales, se utilizaron resinas translúcidas, opacas y opalescentes, además de resinas para reproducir las capas de esmalte y dentina.Conclusiones: Una buena selección del material y la correcta aplicación de la técnica, permiten restauraciones imperceptibles, con un excelente nivel de texturizado, acabado y pulido, devolviendo la armonía de la sonrisa (AU).


Subject(s)
Humans , Female , Adult , Composite Resins , Dental Materials , Dental Restoration, Permanent/methods , Esthetics, Dental , Brazil
11.
São José dos Campos; s.n; 2020. 83 p. il., graf., tab..
Thesis in Portuguese | LILACS, BBO | ID: biblio-1248193

ABSTRACT

O objetivo do estudo foi avaliar o comportamento mecânico de materiais restauradores utilizados na reabilitação da guia canino. O estudo foi dividido em uma etapa in sílico e outra in vitro. Dez modelos 3D de dentes caninos hígidos foram obtidos por engenharia reversa e utilizados como Grupo Controle (n = 10) para o teste in sílico por meio da análise por elementos finitos (FEA). Um desgaste incisal de 2 mm foi simulado em cada amostra 3D e reabilitado com restauração incisal direta de resina composta (Grupo IRC, n = 10) e indireta de cerâmica (Grupo IC, n = 10). Os mesmos modelos também receberam, além do desgaste incisal, um preparo vestibular para faceta laminada, restaurados com os mesmos materiais, compondo os Grupos FRC (faceta de resina composta, n = 10) e FC (faceta cerâmica, n = 10). Os modelos foram exportados para um software de engenharia assistida por computador (CAE) e as geometrias foram transformadas em malhas de elementos tetraédricos, consideradas sólidas, isotrópicas, homogêneas e lineares. Uma carga de 100 N foi aplicada simulando a desoclusão pelo canino para análise mecânica estrutural dinâmica. A deformação total foi mensurada e a tensão máxima principal foi usada como critério de falha. Com base nos resultados da avaliação in sílico, dois tipos de restauração foram selecionados para a fase in vitro, onde realizou-se um ensaio mecânico de fadiga para análise do desgaste. Trinta dentes caninos hígidos foram distribuídos em três grupos: Controle (n = 10), IRC (n = 10) e FC (n = 10). As amostras foram submetidas ao ensaio de fadiga em cicladora mecânica com deslizamento de 2 mm por 240.000 ciclos, carga de 49 N e 4 Hz de frequência, imersas em água em temperatura ambiente. A cada 60.000 ciclos as amostras foram moldadas e seus modelos escaneados para avaliação da quantidade de desgaste através da técnica de correlação por imagem digital, quantificando a perda de estrutura a cada intervalo. As técnicas restauradoras com resina composta sofreram maior deformação total, tendo a cerâmica um comportamento semelhante ao dente hígido. A probabilidade de falha no movimento de desoclusão foi menor na cerâmica. Para o desgaste, não houve diferença significante entre grupos experimentais até 180.000 ciclos. Aos 240.000 ciclos, a resina composta apresentou maior desgaste que a cerâmica (p = 0,02). Todos os grupos provocaram desgaste em seus antagonistas, mas não houve diferença significante entre eles (p < 0,05). Dentro das limitações deste estudo, pode-se concluir que os laminados cerâmicos apresentaram menor desgaste, deformação e probabilidade de falha na restauração da guia canino. Ainda, a anatomia do dente e o tipo de restauração influenciaram o comportamento dos materiais(AU)


The purpose of this study was to evaluate the mechanical behavior of materials restorative used in rehabilitation of canine guide. The study was divided in two parts in silico and in vitro test. Ten 3D models of sound canine teeth were obtained by reverse engineering technique and used as Control Group (n = 10) to in silico test by finite elements analysis (FEA). A 2 mm wear were simulated in each 3D sample and restored according to restorative material; Group IRC (Incisal Composite Resin, n=10) and Group IC (Incisal Ceramic, n = 10). Laminate preparations were modeled and restored with the same materials, Group FRC (Laminate Composite Resin, n=10) and Group FC (Laminate Ceramic, n = 10). All models were exported to Computer Aided Engineering (CAE) software, the geometries were meshed with tetrahydric elements and all contacts were considered perfectly bonded. The load simulated the canine guide (100 N) and the assembly was constrained at the bottom surface to run a structural mechanic dynamic analysis. The Total Deformation was measured and Maximum Principal Stress was used as failure criteria. Thirty sound canine tooth were divided in three groups to in vitro test; Control (n = 10), IRC (n = 10) and FC (n = 10). The samples were subjected to the fatigue test in a wear machine for 240.000 cycles, load of 49 N, frequency of 4 Hz, sliding distance of 2 mm in water at room temperature. The samples were molded every 60.000 cycles and their models scanned to evaluate wear by digital image correlation. Composite resin groups showed higher total deformation and ceramic groups had a more similar behavior to the control group. The probability of failure was lower for the ceramic in the canine guidance. For wear, there was no significant difference between groups up to 180.000 cycles. After 240.000 cycles, the wear was greater in the IRC group (p = 0,02). The wear of the antagonists was not statistically different between groups. Within the limitations of this study, it can be concluded that the ceramic laminates showed less wear, deformation and probability of failure in restoring of the canine guide. In addition, anatomy of the tooth and type of restoration influenced the behavior of the materials(AU)


Subject(s)
Tooth Wear/complications , Dental Restoration Wear/adverse effects , Finite Element Analysis/statistics & numerical data , Dental Restoration, Permanent/methods
12.
Odovtos (En línea) ; 21(3): 17-31, Sep.-Dec. 2019. graf
Article in Spanish | LILACS, BBO | ID: biblio-1091489

ABSTRACT

RESUMEN La preservación de tejido dental sano contribuye a la práctica de una Odontología conservadora, permitiendo la aplicación de los principios biológicos y mecánicos de una forma más predecible. Las preparaciones cavitarias mínimamente invasivas son el complemento de la correcta selección de materiales adhesivos y de resina compuesta. La correcta aplicación de un protocolo adhesivo nos proporcionará resultados estéticos imperceptibles y un longevo desempeño clínico.


ABSTRACT The preservation of healthy dental structures contributes to the practice of a conservative dentistry. This concept involves the implementation of biological and mechanical principles in a more predictable manner. Minimally invasive cavity preparations are the complement to the selection of adhesive and composite resin materials. The correct application of an adhesive protocol will provide imperceptible aesthetic restorations and adequate clinical performance.


Subject(s)
Humans , Female , Adult , Dentin-Bonding Agents/therapeutic use , Composite Resins/therapeutic use , Dental Enamel Hypoplasia/surgery , Dental Restoration, Permanent/methods
13.
Odovtos (En línea) ; 21(2): 23-31, May.-Aug. 2019. graf
Article in English | LILACS, BBO | ID: biblio-1091478

ABSTRACT

ABSTRACT Composite resins are excellent materials for direct restorations in the posterior region, satisfactorily reestablishing esthetics and function. Recently, a new class of composites has been commercialized, the so-called Bulk-fill resins. These resins may be inserted in the dental cavity in increments of 4 to 5 mm thick, and have the advantages of reducing polymerization shrinkage and clinical working time. The aim of this case report was to describe the use of bulk-fill composite resins to restore Class I and Class II cavities by means of two different restorative techniques.


RESUMEN Las resinas compuestas son excelentes materiales para restauraciones directas en la región posterior, restableciendo satisfactoriamente la estética y la función. Recientemente, se ha comercializado una nueva clase de compuestos, las denominadas resinas Bulk Fill. Estas resinas pueden insertarse en la cavidad dental en incrementos de 4 a 5 mm de espesor, y tienen las ventajas de reducir la contracción de la polimerización y el tiempo de trabajo clínico. El objetivo de este informe de caso fue describir el uso de resinas Bulk fill para restaurar las cavidades de Clase I y Clase II mediante dos técnicas de restauración diferentes.


Subject(s)
Humans , Adult , Composite Resins , Dental Restoration, Permanent/methods
14.
J. oral res. (Impresa) ; 8(3): 210-219, jul. 31, 2019. ilus, tab
Article in English | LILACS | ID: biblio-1145338

ABSTRACT

Objective: To assess the six-month clinical outcome of restorations of non-carious cervical lesions (NCCL) with two composite resins: Bulk-Fill and nanohybrid resin. Materials and methods: Fifty-one patients, with three NCCLs each, were randomly allocated into three restoration groups: Tetric-N-Ceram Bulk-Fill (TB); Filtek Bulk-Fill (FB); y Filtek Z350XT (Z350). Adhesive techniques and restorative procedures were performed according to the manufacturers' instructions for the different materials. A 4mm increment was applied in TB and FB, and increments of ≤2mm depth were applied in Z350. Restorations were assessed by two calibrated examiners at baseline and at six months according to the FDI World Dental Federation guidelines (1: excellent, 2: acceptable, 3: sufficient, 4: unsatisfactory, 5: unacceptable) in Marginal Staining (MS), Fracture-Retention (FR), Marginal Adaptation (MA), Postoperative Sensitivity (S) and Caries (C). Wilcoxon test was used for the comparison between baseline and 6 months, and Kruskal-Wallis for the comparison of the three groups at six months (95% significance). Results: Forty-six patients with a total of 138 restorations attended a check-up at six months and were evaluated with excellent clinical outcome. In MS, 91.2% for Z350 and 97.8% for FB and TB; in FR, 97.8% for Z350 and 100% for FB and TB; in MA, 95.6% for Z350, 97.8% for FB and 100% for TN; in S, 95.6% for all three groups; and 100% for C. No statistically significant differences were found between the three groups nor in the comparison between the baseline and 6 months (p>0.05) Conclusion: No significant differences are observed between the three groups of resins in the parameters of MS, MA, S, FR and C regarding clinical outcome at six months.


Objetivo: Evaluar el comportamiento clínico a 6 meses en restauraciones de lesiones cervicales no cariosas (LCNC) con dos resinas compuestas Bulk-Fill y una resina nanohíbrida. Materiales y métodos: En 51 pacientes se restauraron 3 LCNC distribuidas aleatoriamente en 3 grupos, TB: Tetric-N-Ceram Bulk-Fill, FB: Filtek Bulk-Fill y Z350: Filtek Z350XT. Las técnicas adhesivas y procedimientos restauradores fueron realizados según las instrucciones de los fabricantes para los diferentes materiales. En TB y FB se aplicó un incremento de 4mm y en Z350 se aplicó incrementos ≤2mm de profundidad. Dos operadores calibrados evaluaron las restauraciones al baseline y 6 meses mediante los criterios clínicos FDI (1: excelente, 2: aceptable, 3: suficiente, 4: insatisfactorio, 5: inaceptable) en Tinción Marginal (TM), Fractura-Retención (FR), Adaptación Marginal (AM), Sensibilidad Postoperatoria (S) y Caries (C). Se utilizó Wilcoxon para la comparación entre baseline ­ 6 meses y Kruskal-Wallis para la comparación de los 3 grupos a 6 meses (significancia de 95%). Resultados: A los 6 meses asistieron 46 pacientes con un total de 138 restauraciones siendo evaluados con comportamiento clínico excelente; en TM 91,2% para Z350 y 97,8% para FB y TB; en FR, Z350 presentó 97,8% y en FB y TB el 100%; en AM, 95,6% para Z350, 97,8% para FB y 100% para TN; en S presentó 95,6% para los tres grupos; en C se presentó el 100%. No hubo diferencias estadísticamente significativas entre los 3 grupos y en la comparación de baseline - 6 meses (p>0.05). Conclusión: No existen diferencias significativas en el comportamiento clínico a 6 meses entre los 3 grupos de resinas en los parámetros TM, AM, S, FR Y C.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Young Adult , Tooth Demineralization/therapy , Composite Resins/chemistry , Dental Restoration, Permanent/methods , Chile , Double-Blind Method , Treatment Outcome , Tooth Cervix , Resin Cements/chemistry , Dental Materials
15.
J. oral res. (Impresa) ; 8(3): 228-235, jul. 31, 2019. tab
Article in English | LILACS | ID: biblio-1145340

ABSTRACT

Objective. To evaluate the degree of marginal sealing and adhesive strength in Bulk-Fill resin by applying 18% EDTA gel compared to 37% phosphoric acid gel in dental conditioning. Materials and methods. The study was transversal, experimental comparative, and applied. The sample group consisted of 60 teeth with Class I cavities, which were later subjected to conditioning. This was carried out separately with phosphoric acid gel for 15 seconds, and 18% EDTA gel within two different time frames: 60 and 90 seconds. All samples were incubated at 37ºC for a period of 24 hours and thermocycled between 5 to 55ºC for 500 cycles. To assess microfiltration, they were immersed in methylene blue at 37ºC for 4 hours, and were later sectioned and observed through a stereomicroscope. In order to perform the traction, the conventional testing machine was used at a speed of 0.75mm/min until the screw with the resin detached. Results: Samples conditioned with 37% phosphoric acid showed a greater degree 1 microfiltration and a mean adhesive resistance of 7.97 MPa. The same number of microfiltration grades 1 and 2 was found when using EDTA gel for 60 seconds, with a mean tensile strength of 8.8 MPa. On the other hand, applying EDTA gel for 90 seconds showed mostly grade 1 microfiltrations, and to a lesser extent, grade 0 and 2, with a mean resistance of 9.2 MPa. Conclusion: There are no statistically significant differences regarding adhesive strength between the two gels; however, better marginal filling was observed when samples were conditioned with 18% EDTA gel for 90 seconds.


Objetivo. Evaluar el grado de sellado marginal y resistencia adhesiva en resina Bulk ­ Fill aplicando gel de EDTA al 18% en comparación al gel de ácido fosfórico al 37% en el acondicionamiento dental. Materiales y métodos. El tipo de estudio fue transversal, comparativo, de nivel aplicativo y diseño experimental. La muestra estuvo conformada por 60 dientes con cavidades clase I; se realizó el acondicionamiento con gel de ácido fosfórico, gel del EDTA al 18% en 60 segundos y 90 segundos. El total de las muestras fueron incubados a 37°C por 24 horas, se termocicló con 500 ciclos entre 5 a 55ºC. Para evaluar microfiltración, fueron sumergidos en azul de metileno a 37ºC por 4 horas, fueron seccionadas y observados al estereomicroscopio, para realizar la tracción se empleó la máquina de ensayos universales a una velocidad de 0.75mm/min hasta que se desprendiera el tornillo con la resina. Resultados. Las muestras acondicionadas con ácido fosfórico al 37% presenta mayor microfiltración grado 1 y el promedio de su resistencia adhesiva es de 7.97Mpa, la microfiltración obtenida con EDTA en 60 segundos presenta equidad entre grado 1 y 2; promedio de resistencia a la tracción de 8.8 Mpa y el EDTA 90 segundos presentó mayor microfiltración grado 1 y el resto 0 y 2; el promedio de resistencia fue 9.2 Mpa. Conclusión. No existen diferencias estadísticamente significativas al comparar los acondicionantes para la prueba de resistencia adhesiva, sin embargo se observó mejor sellado marginal cuando se acondicionó con gel de EDTA al 18 % por 90 segundos.


Subject(s)
Humans , Dental Bonding , Dental Marginal Adaptation , Composite Resins/chemistry , Dental Restoration, Permanent/methods , Temperature , Acid Etching, Dental , Microstraining , Double-Blind Method , Cross-Sectional Studies , Edetic Acid , Dental Materials
16.
J. appl. oral sci ; 27: e20180678, 2019. tab, graf
Article in English | LILACS, BBO | ID: biblio-1040230

ABSTRACT

Abstract Bulk-fill restorative materials such as bulk-fill composite resins and high viscous glass ionomer cements have become very popular materials in operative dentistry because their application is easy and time-saving. Objectives: The aim of this clinical study was to evaluate the clinical performance of a highly viscous reinforced glass ionomer material, a bulk-fill composite resin and a micro hybrid composite resin in Class II restorations. Methodology: In total, 109 Class II restorations were performed in 54 patients using three different restorative materials: Charisma Smart Composite (CSC); Filtek Bulk Fill Posterior Restorative (FBF); Equia Forte Fil (EF). Single Bond Universal adhesive (3M ESPE, Germany) was used with composite resin restorations. The restorations were evaluated using modified USPHS criteria in terms of retention, color match, marginal discoloration, anatomic form, contact point, marginal adaptation, secondary caries, postoperative sensitivity and surface texture. The data were analyzed using Chi-Square, Fischer's and McNemar's tests. Results: At the end of one year, 103 restorations were followed up. No changes were observed during the first 6 months. At the end of one year, there were small changes in composite restorations (FBF and CSC) but no statistically significant difference was observed between the clinical performances of these materials for all criteria (p>0.05). However, there was a statistically significant difference between EF, FBF and CSC groups in all parameters except marginal discoloration, secondary caries and postoperative sensitivity in one-year evaluation (p<0.05). Conclusion: Bulk-fill composite resins and conventional composite resins showed more successful clinical performance than highly viscous reinforced glass ionomers in Class II cavities.


Subject(s)
Humans , Male , Female , Adult , Composite Resins/therapeutic use , Dental Restoration, Permanent/methods , Glass Ionomer Cements/therapeutic use , Prospective Studies , Reproducibility of Results , Treatment Outcome , Bisphenol A-Glycidyl Methacrylate/therapeutic use , Sex Distribution , Dental Marginal Adaptation , Dental Caries/therapy
17.
Braz. oral res. (Online) ; 33: e125, 2019. tab, graf
Article in English | LILACS, BBO | ID: biblio-1100928

ABSTRACT

Abstract Atraumatic Restorative Treatment (ART) is one of the strategies used to control dental caries; it involves hand instruments for removal of carious tissue, and restorations using high-viscosity Glass Ionomer Cement (GIC). The present controlled clinical trial aimed to evaluate the performance of low-cost GIC indicated for ART in primary teeth, compared with high-viscosity GIC, after one year of follow-up. Two-to six-year-old children with dentin caries lesions on one or two surfaces of anterior and posterior teeth were selected. The children were randomly assigned to 2 groups according to the restorative material used: G1 (control) - Ketac Molar®; G2 (experimental) - Vitro Molar®. Treatments were performed in a school setting, following the guidelines of the ART. A total of 728 restorations were performed in 243 children. Descriptive analysis and Poisson regression were applied, with a significance level of p < 0.05. After 12 months, 559 (76.8%) restorations were re-evaluated. The success rate was evaluated by the prevalence ratio (PR), associated with restorations performed in primary second molars (PR = 1.21; 95%CI = 1.03-1.42), and with small (PR = 1.35; 95%CI = 1.14-1.60) or medium cavities (PR = 1.29; 95%CI = 1.08-1.55), using Ketac Molar® material (PR= 1.07; 95%CI = 1.01-1.15), considering p < 0.05. Small or medium restorations in primary second molars performed with high-viscosity GIC (Ketac Molar®) were more successful than restorations performed with low-cost GIC indicated for ART.


Subject(s)
Humans , Male , Female , Child, Preschool , Child , Dental Caries/therapy , Dental Atraumatic Restorative Treatment/methods , Glass Ionomer Cements/chemistry , Time Factors , Tooth, Deciduous , Viscosity , Materials Testing , Poisson Distribution , DMF Index , Treatment Outcome , Dental Restoration Failure , Dental Restoration, Permanent/methods , Glass Ionomer Cements/therapeutic use
18.
Braz. oral res. (Online) ; 33: e052, 2019. tab, graf
Article in English | LILACS | ID: biblio-1011663

ABSTRACT

Abstract This double-blind randomized controlled clinical trial evaluated the effectiveness of dentin pretreatment with 100% ethanol (EWBT - ethanol wet bonding technique) and different adhesive protocols in noncarious cervical lesions (NCCL) after 6 months. Patients presenting at least one NCCL were included. NCCLs (n=148) were randomly assigned to 4 groups: NE (Non-EWBT + three-step etch-and-rinse (Scotchbond Multi Purpose, 3M ESPE [MP]), E (EWBT + MP); EB (EWBT + [Bond - third step of MP]), and EU (EWBT + universal adhesive (Single Bond Universal, 3M ESPE). Conventional acid-etching (Condac 37%, FGM) and nanohybrid resin composite (Z350, 3M ESPE) were used. Trained and calibrated examiners (Kappa = 0.61) evaluated the restorations at baseline (7 days) and 6-month recall using the USPHS modified criteria. Data were subjected to Chi square (α = 0.05). Differences in the success rate were found for the treatments (p = 0.003). EB presented the lowest success rate compared with the other groups (p < 0.02). No significant differences were detected among NE, E, and EU (p > 0.49). The survival rates were 97.23%, 97.30%, 78.95%, and 97.30% for NE, E, EB, and EU, respectively. Regarding postoperative sensitivity, a significant reduction was found for groups E (p = 0.027) and EU (p < 0.01) after 6 months. After 6 months, EWBT associated to the hydrophobic adhesive system had the highest failure rate.


Subject(s)
Humans , Male , Female , Middle Aged , Dental Bonding/methods , Composite Resins/chemistry , Dental Restoration, Permanent/methods , Tooth Wear/therapy , Double-Blind Method , Dental Restoration Failure , Dental Stress Analysis , Dentin/chemistry , Ethanol
19.
Braz. oral res. (Online) ; 33: e012, 2019. tab, graf
Article in English | LILACS | ID: biblio-989475

ABSTRACT

Abstract The aim of this study was to investigate the mechanical performance and the fracture behavior of endocrown restorations prepared using distinct restorative materials. A total of 42 sound molars with similar crown size and shape were cut at 2 mm above the cementoenamel junction and endodontically treated. They were categorized according to the restorative material used to fabricate endocrown restorations (n=7), namely, conventional composite (Filtek™ Z350 XT), bulk fill composite (Filtek™ Bulk Fill), conventional composite modeled using resin adhesives (SBMP: Scotchbond™ Multipurpose Adhesive; or SBU: Scotchbond™ Universal Adhesive), and IPS e.max lithium disilicate (Ivoclar Vivadent; positive control). Unprepared sound teeth were used as negative control. All endocrowns were bonded using a self-adhesive cement (Rely-X™ U200). The teeth were submitted to fatigue (Byocycle) and fracture (EMIC DL500) testing. Load-to-fracture (in N) and work-of-fracture (Wf, in J/m2) values were analyzed by ANOVA (p < 0.05). The endocrowns did not fracture or de-bond upon fatigue, showing similar load-to-fracture and work-of-fracture values, regardless of the restorative material (p > 0.05). The endocrowns fabricated by combining Z350 and SBMP had the least harsh fractures, in contrast to endocrowns prepared using Z350 only, which exhibited an equilibrium between repairable and irrepairable fractures. The e.max endocrowns exhibited more aggressive failures (root fracture) than other groups, resulting in higher rates of irrepairable fractures. In conclusion, dental practitioners may satisfactorily restore severely damaged nonvital teeth using the endocrown technique. Composite endocrowns prepared using resin adhesive as modeler liquid or using bulk fill material may result in less aggressive failures, thus providing a new material perspective for endocrown restorations.


Subject(s)
Humans , Dentin-Bonding Agents/chemistry , Composite Resins/chemistry , Resin Cements/chemistry , Crowns , Dental Restoration, Permanent/methods , Reference Values , Root Canal Filling Materials/chemistry , Tooth Fractures , Materials Testing , Reproducibility of Results , Dental Prosthesis Design , Tooth, Nonvital , Dental Restoration Failure , Dental Porcelain/chemistry , Dental Stress Analysis
20.
J. appl. oral sci ; 27: e20180631, 2019. tab, graf
Article in English | LILACS, BBO | ID: biblio-1012520

ABSTRACT

Abstract Extensive restorations in posterior teeth always bring doubts to the clinicians regarding the best protocol, mainly when structures of reinforcement were lost. Objective This study aimed to evaluate the effect of beveling on the fracture resistance and pattern of class II (MOD) restored teeth. Methodology Ninety human premolars were randomly assigned into 9 groups: CTR (control/sound); NC (cavity preparation, non-restored); RU (restored, unbeveled); RTB (restored, entire angle beveling); RPB (restored, partial/occlusal beveling); EC (endodontic access/EA, non-restored); EU (EA, unbeveled); ETB (EA, entire angle beveling); EPB (EA, partial/occlusal beveling). Teeth were restored with Esthet X resin composite and stored in distilled water for 24 h before the inclusion in PVC cylinders. The axial loading tests were performed with 500 kgF at 0.5 mm/min crosshead speed until fracture of the specimens. Fracture resistance and pattern were accessed and data were analyzed using one-way ANOVA and Tukey's HSD test (α=0.05). Results Mean (±SD) failure loads ranged from 136.56 (11.62) to 174.04 (43.5) kgF in the groups tested without endodontic access. For endodontically accessed teeth, fracture resistance ranged from 95.54 (13.05) to 126.51 (19.88) kgF. Beveling of the cavosurface angle promoted the highest fracture resistance values (p<0.05) and prevented catastrophic fractures. Conclusions Cavosurface angle beveling is capable of improving fracture resistance and pattern for both endodonticaly accessed and non-accessed teeth.


Subject(s)
Humans , Bicuspid , Dental Cavity Preparation/methods , Dental Restoration, Permanent/methods , Reference Values , Tooth Fractures , Random Allocation , Reproducibility of Results , Risk Factors , Analysis of Variance , Treatment Outcome , Composite Resins/therapeutic use , Tooth, Nonvital
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