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1.
Braz. j. oral sci ; 21: e224977, jan.-dez. 2022. ilus
Article in English | LILACS, BBO | ID: biblio-1354723

ABSTRACT

Aim: This study aims to evaluate the clinical assessment results of periimplant soft tissue with morse taper (internal abutment connection). Methods: The study was conducted using a rapid review by searching the articles from PubMed NCBI and Cochrane by using keywords. All articles were selected by the year, duplication, title, abstract, full-text, and finally, all selected articles were processed for final review. Following clinical parameters were included; Periimplant Probing Pocket Depth (PPD), Plaque Score (PS), modified Plaque Index (mPI), Mucosal Thickness (MTh), Gingival Height (GH), periimplant mucosal zenith, Pink Esthetic Score (PES), Bleeding On Probing (BOP), Sulcus Bleeding Index (SBI), and modified Gingival Index (mGI). Results: 9 selected articles were obtained from the initial literature searching count of 70 articles. The overall samples included 326 morse taper implants. Based on the evaluation, 3 out of 4 articles reported pocket depth < 4 mm, no bleeding was reported in 2 out of 4 articles. 4 out of 4 articles reported low plaque accumulation, low soft tissue recession was reported in 3 out of 3 articles, and 4 out of 4 articles reported acceptable PES values. Conclusion: The evaluations indicate that the morse taper (internal abutment connection) has favorable assessment results based on various clinical parameters


Subject(s)
Dental Implants , Dental Abutments , Soft Tissue Injuries , Dental Implant-Abutment Design , Gingiva , Mouth Mucosa
2.
Braz. dent. sci ; 24(3): 1-16, 2021. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1281922

ABSTRACT

Objective: This study was performed to evaluate the use of PEEK abutments versus zirconium abutments with lithium disilicate superstructure on the esthetic acceptance and peri-implant clinical parameters. Zirconium abutments were found to have high surface roughness even after polishing. This causes a remarkable collapse of the soft tissue papilla that is a primary factor in the Pink Esthetic Score(PES), resulting in failed esthetic restoration in the anterior esthetic zone. Material and Methods:Twenty patients who needed a single implant restoration in the esthetic zone were included in this study. Eighteen patients completed screening, baseline, three-month, six-month, and twelve-month follow-up visits. At the screening visit, the patients were randomly allocated into two groups: Zirconia abutments (A) Group, and PEEK abutments (B) Group, both of which were restored with IPS e.max CAD superstructure. Patients Satisfaction was assessed by visual analogue scale (VAS). Pink esthetics score (PES), modified plaque index (mPI) and modified gingval index (mGI) were also assessed. Results: All implants were successfully osseo-integrated with a 100% survival rate over one year. Patient satisfaction was significantly higher for the PEEK group than the zirconium group. The pink esthetic score showed no statistical significance between both groups. The modified plaque index was significantly lower for the PEEK group than the zirconium group. The modified gingival index showed no statistical difference between both groups. Conclusion: PEEK revealed to be a versatile material to replace zirconium for implant abutments, due to its lower plaque affinity and higher patient satisfaction (AU)


Objetivo: Este estudo foi realizado para avaliar o uso de pilares PEEK versus pilares de zircônia com estrutura de dissilicato de lítio quanto a aceitação estética e parâmetros clínicos peri-implantares. Os pilares de zircônia apresentam alta rugosidade superficial, mesmo após o polimento. Isso causa um colapso notável da papila do tecido mole, que é um fator primário no índice estético rosa (Pink Esthetic Score - PES), resultando em falha na restauração estética na zona estética anterior. Materiais e Métodos:Vinte pacientes que precisavam de um implante unitário na zona estética foram incluídos neste estudo. Dezoito pacientes completaram a triagem, a consulta inicial e as visitas de acompanhamento de três, seis e doze meses. Durante a triagem, os pacientes foram aleatoriamente divididos em dois grupos: Grupo Pilares de Zircônia (A) e Grupo de Pilares PEEK (B), ambos foram restaurados com IPS e.max CAD. A satisfação dos pacientes foi avaliada pela escala visual analógica (VAS). O PES, o índice de placa modificado (mPI) e o índice gengival modificado (mGI) também foram avaliados. Resultados: Todos os implantes foram osseointegrados com sucesso, com uma taxa de sobrevivência de 100% ao longo de um ano. A satisfação do paciente foi significativamente maior para o grupo PEEK quando comparado com o grupo de pilares de zircônia. O índice da estética rosa não apresentou significância estatística entre os dois grupos. O índice de placa modificado foi significativamente menor para o grupo PEEK quando comparado com o grupo de pilares de zircônia. Conclusão: O PEEK revelou-se um material versátil para substituir a zircônia em pilares de implante, devido a sua menor afinidade de placa e maior satisfação do paciente. (AU)


Subject(s)
Humans , Dental Abutments , Patient Satisfaction , Dental Implantation , Dental Implantation, Endosseous
3.
Braz. dent. j ; 31(4): 374-379, July-Aug. 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1132322

ABSTRACT

Abstract The aim of this study was to verify the effect of the implant volume loss, vertical misfit between abutment and prosthetic platform, prosthetic screw loosening torque, and screw stress distribution in titanium and zirconia abutments. Ten CAD/CAM system custom abutments of each material were milled and attached to the titanium implants. The implant volume loss was evaluated by microtomography, the vertical misfit with optical microscopy, and digital torque wrench measured the prosthetic screw loosening. All experimental analyses were performed before and after mechanical cycle (1,000,000 cycles, 100 N/2 Hz). Virtual models of the structures were created for finite element analysis, and the stress on the screw obtained with von Mises procedure. Data were analyzed using an independent t-test, two-way ANOVA for repeated measures, and Tukey's HSD test (a=0.05). There was no significant difference in the implant volume loss for the two abutment materials (p=0.662). Titanium abutments provided higher loosening torque values after mechanical cycling (p<0.001). Lesser marginal misfit was obtained with titanium abutments before and after mechanical cycling (p<0.001). The stress distribution on the screw was similar between abutment materials. In conclusion, CAD/CAM custom titanium abutment reduced the marginal misfit and increased the torque maintenance of prosthetic screws when compared to CAD/CAM custom zirconia abutment.


Resumo O objetivo neste estudo foi verificar o efeito da diminuição de volume do implante, desajuste vertical entre o pilar e plataforma protética, torque de afrouxamento do parafuso protético e distribuição da tensão no parafuso em pilares de titânio e zircônia. Dez pilares personalizados de cada material foram fresados e conectados aos implantes de titânio. A diminuição de volume do implante foi avaliada com microtomografia, o desajuste vertical com microscopia óptica e o torque de afrouxamento do parafuso protético com chave de torque digital. Todas as análises experimentais foram realizadas antes e após aplicação do ciclo mecânico (1.000.000 ciclos, 100 N/2 Hz). Modelos virtuais das estruturas foram criados para análise por elementos finitos e a tensão no parafuso obtida com valores de von Mises. Os dados foram analisados usando teste t independente, análise de varância dois fatores para medidas repetidas e teste de Tukey HSD (a=0,05). Não houve diferença significativa na diminuição de volume do implante para os dois materiais do pilar (p= 0,662). Os pilares de titânio proporcionaram maiores valores de torque de afrouxamento após o ciclo mecânico (p<0,001). O menor desajuste marginal foi obtido com os pilares de titânio antes e após o ciclo mecânico (p<0,001). A distribuição da tensão no parafuso foi similar entre os materiais. Em conclusão, os pilares personalizados de titânio reduziram o desajuste marginal e aumentaram a manutenção do torque dos parafusos protéticos quando comparados aos pilares de zircônia.


Subject(s)
Titanium , Dental Abutments , Zirconium , Bone Screws
4.
Braz. dent. j ; 31(2): 127-134, Mar.-Apr. 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1132279

ABSTRACT

Abstract The aim of this study was to assess the internal and vertical marginal fit of metallic copings to abutments and the fracture strength of different narrow diameter dental implant/abutments, either submitted to thermomechanical cycling or not. Sixty-four implant/abutments (n=16) were divided into 4 groups according to diameter and abutment type: G3.5-UAC (morse taper implant Ø3.5mm + universal abutment with beveled chamfer finish); G2.9-UAS (morse taper implant Ø2.9mm + universal abutment with shoulder finish); G2.8-AA (morse taper friction implant Ø2.8mm + anatomical abutment) and G2.5-HP (one-piece implant Ø2.5mm with indexed hexagonal platform). Each group was divided into two subgroups (n=8): submitted and not submitted to thermomechanical cycling (TMC). To assess internal and vertical marginal fit of metallic copings, the assemblies were scanned using microtomography (micro-CT) (n=5). The samples were subjected to the compressive strength test on a universal test machine. Group G3.5-UAC showed the highest marginal misfit regardless of TMC (p<0.05). All other groups were similar after TMC. Group G2.8-AA showed the lowest internal misfit both with and without TMC (p<0.05). Group G2.8-AA showed the highest fracture strength, similar only to G2.5-HP without TMC and G3.5-UAC with TMC. The type of abutment affects the internal and marginal fit of metallic copings and the anatomical abutment led to the best internal and marginal coping fit. The narrow diameter dental implant/abutments differ in terms of fracture strength, the strongest assembly was that composed by implant of type V grade titanium without internal threads (friction implant).


Resumo O objetivo deste estudo foi avaliar a adaptação marginal e interna de cópings metálicos em pilares sobre implantes, e a resistência a fratura de diferentes conjuntos de implantes/pilares de diâmetro reduzido, submetidos à ciclagem termomecânica ou não. Sessenta e quatro implantes/pilares (n=16) foram divididos em 04 grupos de acordo com o tipo de pilar e diâmetro do implante: G3.5-UAC (implante cone morse Ø3.5mm + munhão universal com término em chanfro); G2.9-UAS (implante cone morse Ø2.9mm + munhão universal com término em ombro); G2.8-AA (implante cone morse friccional Ø2.8mm + munhão anatômico); e G2.5-HP (implante de corpo único de Ø2.5mm com plataforma hexagonal indexada). Cada grupo foi dividio em dois subgrupos (n=8): submetidos ou não à ciclagem termomecânica (TMC). As amostras foram escaneadas por microtomografia (micro-CT) para avaliar a adaptação interna e marginal vertical dos copings metálicos. As amostras foram submetidas à resistência à compressão em uma maquina de ensaios universal. O grupo G3.5-UAC apresentou os maiores valores de desadaptação marginal independentemente da TMC (p<0,05). Todos os outros grupos foram similares entre si após TMC. O grupo G2.8-AA demonstrou o menor desajuste interno independentemente de TMC (p<0,05). O grupo G2.8-AA demonstrou a maior resistência à fratura, similar apenas ao grupo G2.5-HP sem TMC e G3.5-UAC com TMC. O tipo de pilar influencia a adaptação interna e marginal vertical de copings metálicos. O grupo do pilar anatômico (sem entalhes na superfície) levou à melhor adaptação, enquanto o grupo com plataforma expandida hexagonal e os grupos com munhão universal (com entalhes na superfície) proporcionaram os maiores desajustes (especialmente com termino em chanfro). Os implantes/pilares de diâmetro reduzido diferem em termos de resistencia à fratura, sendo que o conjunto mais resistente foi aquele composto por titânio tipo V e sem roscas internas (implante friccional).


Subject(s)
Dental Implants , Titanium , Zirconium , Materials Testing , Dental Abutments , Dental Stress Analysis , Dental Implant-Abutment Design , Flexural Strength
5.
Rev. Asoc. Odontol. Argent ; 108(1): 29-39, ene.-abr. 2020. ilus
Article in Spanish | LILACS | ID: biblio-1096767

ABSTRACT

El objetivo de este artículo es revisar la evidencia científica existente acerca de los tipos de retención protética fija sobre implantes: atornillada, cementada y cemento-atornillada. Fueron evaluadas sus ventajas y desventajas a fin de facilitar al clínico la elección del sistema de retención en el tratamiento rehabilitador con implantes. Si bien la evidencia científica no es concluyente, la prótesis atornillada presentaría más complicaciones técnicas, y las cementadas, más complicaciones biológicas. Por ello, las prótesis cemento-atornilladas podrían ser en la actualidad una opción de elección, por su versatilidad en la rehabilitación implanto-soportada, combinando las ventajas de cada tipo de retención (AU)


The objective of this article is to review the existing scientific evidence about the different types of retention of fixed prosthetic on implants: screwed, cemented and cement-screwed. The advantages and disadvantages of them were evaluated in order to facilitate the clinician's choice of the retention system in the rehabilitation treatment with implants. Although the scientific evidence is inconclusive, the screwed prosthesis would present more technical complications, while the cemented, more biological complications. Therefore, cement-screwed prostheses could be an option of choice, due to their versatility when rehabilitating an implant, combining the advantages of each type of retention (AU)


Subject(s)
Dental Prosthesis Retention/methods , Dental Prosthesis, Implant-Supported , Crowns , Dental Abutments , Cementation/instrumentation , Dental Prosthesis, Implant-Supported/adverse effects , Dental Restoration Failure , Evidence-Based Dentistry
6.
Article in Chinese | WPRIM | ID: wpr-827510

ABSTRACT

This study aims to apply a new expert system to design removable partial denture (RPD) framework. The RPD design is completed in three steps, namely, "selecting missing teeth", "selecting abutment condition", and "selecting personalized clasp". The system can help auxiliary dentists develop personalized treatment plans to reduce their clinical workload. It can also generate a dental preparation guideline for clinical preparation, which can prevent tooth preparation mistakes. By generating the standard electronic drawings of the framework design, the system can reduce the inconvenience caused by manual drawing, thereby facilitating dentist-technician communication and reducing the rate of remade.


Subject(s)
Dental Abutments , Denture Design , Denture, Partial, Removable , Expert Systems , Tooth
7.
J. appl. oral sci ; 28: e20200343, 2020. graf
Article in English | LILACS, BBO | ID: biblio-1143144

ABSTRACT

Abstract An important factor affecting the biomechanical behavior of implant-supported reconstructions is the implant-abutment misfit. Objective: This study evaluated the misfit between Ti-Base abutments and implants by means of polyvinyl siloxane replica technique using microcomputed tomography (μCT). Methodology: Volumetric and linear (central and marginal) gaps of four Ti-base abutments (n=10/group): (i) Odontofix LTDA (OD), (ii) Singular Implants (SING), (iii) EFF Dental Components (EFF), and (iv) Control Group (S.I.N implants) compatible with an implant system (Strong SW, S.I.N Implants) were measured using μCT reconstructed polyvinyl siloxane replicas. Results: The results showed significantly lower volume gap for Control S.I.N (0.67±0.29 mm3) and SING (0.69±0.28 mm3) Ti-base abutments relative to OD (1.42±0.28 mm3) and EFF groups (1.04±0.28 mm3) (p<0.033), without significant difference between them (p=0.936). While gap values were homogenous in the central region, EFF presented a significantly higher marginal gap. Accordingly, the Control S.I.N and Singular Ti-base abutments showed improved volumetric and marginal fit relative to Odontofix and EFF. Conclusion: The method of manufacturing abutments influenced the misfit at the implant-abutment interface.


Subject(s)
Dental Implants , Dental Abutments , Titanium , Replica Techniques , X-Ray Microtomography , Dental Implant-Abutment Design
8.
Rev. Salusvita (Online) ; 39(1): 141-151, 2020.
Article in Portuguese | LILACS | ID: biblio-1140266

ABSTRACT

Hoje em dia no consultório a indicação de uma prótese fixa em cantilever, ainda gera muitas dúvidas, levando o clinico inseguro, muitas vezes a sua contra indicação. Com intuito de esclarecer as características relacionadas à prótese parcial fixa em cantilever realizou- -se uma revisão de literatura. Uma busca foi realizada nas bases de dados Scielo e Pubmed usando-se as palavras-chaves: Prótese fixa, cantilever, dentes suportes. Os artigos dentro do escopo do estudo foram selecionados e pode-se concluir que estas próteses são uma excelente alternativa conservadora para restabelecimento de dentes perdidos, porém para obtenção de resultados satisfatórios com boa longevidade, especial atenção deve ser desprendida aos princípios biomecânicos dos preparos e um controle rigoroso de placa bacteriana deve ser estabelecido.


Actuality the use of Fixed Partial Denture with Cantilever until causes many doubts, making de dentist do not indicate this treatment. To making clear the characteristics relation to this prosthesis, was done a literature review. A search was performed in the Scielo and Pubmed databases using the keywords: Fixed prosthesis, cantilever, supporting teeth. The articles within the scope of the study were selected and it can be concluded that these were an alternative excellent to reestablish the follow teeth, therefore to obtain the good results with respect long-term prosthetic appliances, special attention should be dispensed to the biomechanics principles and optimal hygiene with plaque control should be established.


Subject(s)
Humans , Denture, Partial, Fixed , Tooth Loss/therapy , Dental Abutments
9.
Braz. dent. j ; 30(3): 238-243, May-June 2019. tab, graf
Article in English | LILACS | ID: biblio-1011550

ABSTRACT

Abstract This in silico study evaluated the influence of the abutment collar height and implants length on the biomechanical behavior of morse taper single dental implants with different crown-to-implant ratio. Six virtual models were constructed (S11, M11, L11, S13, M13 and L13) by combining short (S: 2.5 mm), medium (M: 3.5 mm) or long (L: 4.5 mm) abutment collar heights with different implant lengths (11 or 13-mm). An upper central incisor of 11-mm height was constructed on top of each abutment. Each set was positioned in a virtual bone model and exported to analyze mathematically. A 0.60-mm mesh was created after convergence analysis and a 49 N load was applied to the cingulum of the crown at an angle of 45°. Load-generated stress distribution was analyzed in the prosthetic components according to von Mises stress criteria (σvM) and in the cortical and cancellous bone by means of shear stress (εmax). The use of longer collar abutments (L11) increased the stress on the abutment by 250% and resulted in 40% higher stresses on the screw and 92% higher cortical shear stresses compared to short collared abutments (S11). Increasing the implant length produced a slight stress reduction on cortical bone. Cancellous bone was not affected by the crown-to-implant ratio. Longer abutment collars concentrate stresses at the implant level and cortical bone by increasing the crown-to-implant ratio.


Resumo Este estudo avaliou a influência da altura da porção transmucosa do pilar protético com junção cone morse e do comprimento dos implantes no comportamento biomecânico coroas unitárias com diferentes proporção coroa-implante. Seis modelos virtuais (S11, M11, L11, S13, M13 e L13) foram construídos combinando pilares protéticos com transmucoso considerado: curto (S: 2,5 mm), médio (M: 3,5 mm) ou longo (L: 4,5 mm) com diferentes comprimentos de implantes (11 ou 13 mm). Um incisivo central superior de 11 mm de altura foi construído para cada pilar. Cada conjunto foi posicionado em um modelo de osso virtual e exportado para análise matemática. Uma malha de 0,60 mm foi criada após análise de convergência e uma carga de 49 N foi aplicada ao cíngulo da coroa em um ângulo de 45°. A distribuição de estresse gerada por carga foi analisada nos componentes protéticos de acordo com o critério de tensão de von Mises (σvM) e no osso cortical e medular por meio da tensão de cisalhamento (εmax). O uso de pilares com porção transmucosa mais longa (L11) aumentou a tensão no pilar protético em 250%, e resultou em tensões 40% maiores no parafuso e 92% no osso cortical em relação aos pilares com transmucoso curto (S11). O aumento do comprimento do implante produziu uma ligeira redução da tensão de cisalhamento no osso cortical. O osso medular não foi afetado pela relação coroa-implante. Pilares protéticos com porção transmucosa mais longa concentram tensões no implante e no osso cortical, quando a proporção coroa-implante é aumentada.


Subject(s)
Dental Implants , Dental Prosthesis, Implant-Supported , Stress, Mechanical , Biomechanical Phenomena , Dental Abutments , Finite Element Analysis , Crowns , Dental Stress Analysis
10.
Rev. ADM ; 76(3): 169-172, mayo-jun. 2019. ilus
Article in Spanish | LILACS | ID: biblio-1022281

ABSTRACT

Los implantes dentales se han colocado en sitios de extracción cicatrizados mediante un procedimiento quirúrgico en dos etapas para un periodo de tres a seis meses sin carga. Sin embargo, los pacientes esperan ser rehabilitados lo antes posible, especialmente los pacientes sometidos a restauraciones estéticas en el maxilar anterior. Después de la colocación del implante, la fabricación de la restauración temporal y la carga del implante dentro de las 48 horas se denominan carga inmediata. Esto acorta el tiempo del tratamiento, ya que requiere menos intervenciones quirúrgicas, reduce la pérdida ósea crestal periimplantaria, conduce a la preservación de la morfología de los tejidos blandos y mejora la estética. En este artículo se hablará del caso clínico de un paciente femenino de 44 años de edad que presentaba pérdida del órgano dentario 21. Se realizó valoración periodontal, radiográfica y tomográfica de este órgano dentario, se colocó implante con la utilización de guía quirúrgica y protésica acrílica termocurable, se realizó carga inmediata, el provisional fue conformado con contorno subgingival cóncavo y se toman en cuenta criterios de contorno crítico y subcrítico para el desarrollo ideal del perfil de emergencia. En las citas de valoración se encontraron los tejidos periimplantales estables y la paciente no refirió sintomatología (AU)


Dental implants have been placed in scarred extraction sites by a twostage surgical procedure for a period of three to six months without load. However, patients expect to be rehabilitated as soon as possible, especially patients undergoing esthetic restorations in the anterior maxilla. After implant placement, the fabrication of the temporary restoration and implant loading within 48 hours are called immediate loading. This shortens the time of treatment, beacause it requires fewer surgical interventions, reduces peri-implant crestal bone loss, leads to the preservation of soft tissue morphology and improves aesthetics. In this article we will discuss the clinical case of a 44-year-old female patient who had lost the dental organ 21. Periodontal, radiographic and tomographic assessment of this dental organ was performed, an implant was placed with the use of surgical guide and acrylic prosthesis thermocurable, immediate loading was performed, the provisional was formed with a concave subgingival contour and critical and subcritical contour criteria were taken into account for the ideal development of the emergence profile. In the assessment appointments stable periimplant tissues were found and the patient did not report symptoms (AU)


Subject(s)
Humans , Female , Adult , Dental Abutments , Dental Implants, Single-Tooth , Esthetics, Dental , Immediate Dental Implant Loading , Dental Prosthesis, Implant-Supported , Gingiva , Gingival Recession/therapy , Mexico
11.
Braz. dent. j ; 30(2): 157-163, Mar.-Apr. 2019. tab, graf
Article in English | LILACS | ID: biblio-1001430

ABSTRACT

Abstract The aim of this study was to evaluate the failure probability of two types of abutment screws after compressive load and to analyze the stress distribution with finite element method. Sixty (60) single-tooth implant restorations were assembled on titanium implants (e-fix, A.S. Technology - Titanium Fix). The groups were divided into Conventional screw (Screw neck 1.5 ø mm) and Experimental screw (Screw neck constricted with 1.2 ø mm). Specimens were subjected to single load to failure with compressive test according ISO 14801. The fractured specimens were subjected to stereomicroscopy for measurement of remaining screws inside the implant and characterization of fracture origin. Representative specimens were analyzed by scanning electronic microscopy. For finite element method (FEM), an identical 3D model of the two in vitro test groups were used with similar conditions (30º, 100 N load). The stress in the abutment screw was analyzed by von-Mises criteria. The results of strength means were 4132.5 ± 76 MPa and 4528.2 ± 127.2 for conventional and experimental groups, respectively. During microscopy, the mean (mm) of the remaining screw piece inside the implants were 0.97 ± 0.23 and 1.32 ± 0.12 for conventional and experimental groups, respectively. In FEM, the conventional group showed stress concentered in an unfavorable region (peak of 39.23 MPa), while the experimental group showed more stress areas but less concentration than the conventional group (36.6 MPa). In using the tested experimental geometry, the abutment screw can have its strength improved, and the origin of failure can be more favorable to clinical resolution.


Resumo O objetivo deste estudo foi avaliar a probabilidade de falha de dois tipos de parafusos para pilar protético após a compressão e analisar a distribuição da tensão com o método dos elementos finitos. Sessenta (60) restaurações unitárias foram montadas em implantes de titânio (e-fix, A.S. Technology - Titanium Fix). Os grupos foram divididos em parafusos convencionais (parafuso de pescoço 1,5 ø mm) e parafuso experimental (parafuso de pescoço estreitado com 1,2 ø mm). As amostras foram sujeitas ao teste de compressão de acordo com ISO 14801. Os espécimes fraturados foram submetidos a estereomicroscopia para a mensuração dos parafusos restantes dentro do implante e caracterização da origem da fratura. Os espécimes representativos foram analisados ​​por microscopia eletrônica de varredura. Para o método de elementos finitos (FEM), utilizou-se um modelo 3D idêntico dos dois grupos de teste in vitro com condições semelhantes (30º, 100 N). A tensão no parafuso do pilar foi analisada pelo critério de von-Mises. Os resultados de resistência a compressão foram 4132,5 ± 76 MPa e 4528,2 ± 127,2 para grupos convencionais e experimentais, respectivamente. Durante a microscopia, a média do remanescente do parafuso restante dentro dos implantes foi de 0,97 ± 0,23 e 1,32 ± 0,12 mm para os grupos convencionais e experimentais, respectivamente. Em FEM, o grupo convencional mostrou tensão concentrada em uma região desfavorável (pico de 39,23 MPa), enquanto o grupo experimental apresentou mais áreas de tensão, porém menor concentração do que o grupo convencional (36,6 MPa). Ao usar a geometria experimental testada, o parafuso do pilar pode ter sua resistência melhorada e a origem da falha pode ser mais favorável à resolução clínica.


Subject(s)
Dental Abutments , Dental Implant-Abutment Design , Stress, Mechanical , Titanium , Materials Testing , Probability , Dental Restoration Failure , Dental Stress Analysis
12.
Article in Chinese | WPRIM | ID: wpr-772687

ABSTRACT

Current biomechanical research of dental implants focuses on the mechanical damage and enhancement mechanism of the implant-abutment interface as well as how to obtain better mechanical strength and longer fatigue life of dental implants. The mechanical properties of implants can be comprehensively evaluated by strain gauge analysis, photo elastic stress analysis, digital image correlation, finite element analysis, implant bone bonding strength test, and measurement of mechanical properties. Finite element analysis is the most common method for evaluating stress distribution in dental implants, and static pressure and fatigue tests are commonly used in mechanical strength test. This article reviews biomechanical research methods and evaluation indices of dental implants. Results provide methodology guidelines in the field of biomechanics by introducing principles, ranges of application, advantages, and limitations, thereby benefitting researchers in selecting suitable methods. The influencing factors of the experimental results are presented and discussed to provide implant design ideas for researchers.


Subject(s)
Biomechanical Phenomena , Computer Simulation , Consensus , Dental Abutments , Dental Implant-Abutment Design , Dental Implants , Dental Prosthesis Design , Dental Stress Analysis , Finite Element Analysis , Stress, Mechanical
13.
Braz. oral res. (Online) ; 33(supl.1): e068, 2019. tab, graf
Article in English | LILACS | ID: biblio-1039311

ABSTRACT

Abstract The objective of this systematic review was to compare the conical internal connection (IC) with the external hexagonal connection (EH) on the occurrence of marginal bone loss (ΔMBL). Different databases were used to carry out the selection of the elected studies. The studies were judged according to the risk of bias as "high", "low" and "unclear" risk. For the meta-analysis we included only studies that could extract the data of ΔMBL, survival rate (SR) and probing depth (PD). No statistically significant differences were found for ΔMBL data at one, three- and five-year survival rates between implant connections (p <0.05), however statistically significant differences were found for PD between EH and IC implants (1-year follow-up) -0.53 [95%CI -0.82 to -0.24, p = 0.0004]. This present systematic review demonstrated that there are no significant differences between IC and EH implants for both ΔMBL and SR at 1, 3 e 5 years after functional loading, although better PD values were observed for implants pertaining to the IC connections. Considering the high heterogeneity, more well-delineated, randomized clinical trials should be conducted.


Subject(s)
Humans , Dental Implants/adverse effects , Alveolar Bone Loss/etiology , Dental Abutments/adverse effects , Dental Implant-Abutment Design/adverse effects , Reference Values , Time Factors , Risk Factors , Risk Assessment
14.
Article in French | AIM, AIM | ID: biblio-1263838

ABSTRACT

Introduction : Le but de cette étude était d'évaluer les résultats cliniques et radiologiques des patients ayant une instabilité antérieure traitée par la technique de Latarjet. Patients et méthodes : Dans cette étude rétrospective 14 patients (15 épaules) ont été opérés entre janvier 2013 et décembre 2016 pour une luxation récidivante de l'épaule selon la technique de Latarjet à foyer ouvert. La fonction de l'épaule a été appréciée selon les cotations de Rowe, Duplay , et WOSI (the Western Ontario ShoulderInstability). Les résultats radiographiques ont concerné la consolidation du greffon et la position de la butée. Résultats : Le recul moyen était de 34 mois (7- 64). Douze patients étaient très satisfaits de la stabilité et de la fonction de leur épaules. il n'y avait pas de récidive. Selon la cotation de Walch et Duplay les résultats étaient bons (n=13) et moyen (n=1). Selon Rowe ils étaient bons (n=13) et mauvais ( n=1). Selon la cotation WOSI ils étaient excellents ( n=8), bons ( n=4), et moyens (n=2). Toutes les butées ont consolidées. Elles étaient sous l'équateur. Elles étaient affleurantes (n=14), médiale (n=1). Conclusion : Ce travail suggère que la technique de Latarjet réalisée à foyer ouvert offre aux patients une stabilisation de l'épaule, des mobilités quasi-normales, et la possibilité de reprendre dans de bonnes conditions des activités professionnelles et sportives


Subject(s)
Dental Abutments , Dental Abutments/statistics & numerical data , Patients , Senegal , Shoulder
15.
Rev. ADM ; 75(4): 214-222, jul.-ago. 2018. tab
Article in Spanish | LILACS | ID: biblio-915495

ABSTRACT

En ausencia de guías clínicas que permitan ponderar factores de riesgo para el manejo del paciente bruxista, respecto a los índices de supervivencia de los implantes dentales y restauraciones que soporta, se realiza esta revisión bibliográfi ca a través de una búsqueda electrónica, indagando cómo un incremento en la función muscular pudiera signifi car un factor de riesgo para el implante mismo o para sus diferentes componentes y tipos de diseño protésico. Fue encontrada una diversidad de información contrastante en cuanto a los efectos que tiene el bruxismo en pacientes que han recibido un tratamiento de implantes, respecto a diagnóstico, manejo y adecuaciones o compensaciones que pudieran ser requeridas. En este reporte se ofrecen algunas recomendaciones respecto a la valoración clínica de los individuos con historial de bruxismo para mejor estimar los riesgos de colocación de implantes en sus bocas y poder reducirlos o sobrepasarlos (AU)


The lack of clinical guides to assess the risk factor for the treatment of a patient with bruxism and its relationship with the survival rate of the dental implants and its restoration has motivated a literature review on the subject. This examination was done through an electronic search, looking for the possible association between an increased muscular function as a risk factor and the damage possibility to dental implants or their diff erent prosthetic components. The obtained information was rather contrasting regarding the eff ects that bruxism may lead on dental implant treatment, as well as on diagnosis, management, and treatment plan modifi cations. A number of recommendations are given regarding evaluations of individuals with bruxism to better estimate risk factors to control or overpass them in benefi t of the patients seeking rehabilitation through the use of dental implants (AU)


Subject(s)
Humans , Bruxism , Dental Implants , Dental Occlusion, Traumatic , Dental Prosthesis Design , Dental Abutments , Immediate Dental Implant Loading , Osseointegration , Risk Factors
16.
Braz. dent. j ; 29(1): 7-13, Jan.-Feb. 2018. tab, graf
Article in English | LILACS | ID: biblio-888718

ABSTRACT

Abstract The aim of this systematic review and meta-analysis was to compare the peri-implant vertical bone loss of immediate loading of implant crowns using the one abutment at one time (AOT) protocol and implants with abutment removal (AR). This systematic review with meta-analysis was reported according to the PRISMA statement, with guidance from the Cochrane Collaboration Handbook. A total of 103 publications were identified in the PubMed database and reference lists of examined articles. After the screening of titles and abstracts, the eligibility of eight full-text articles was assessed. Five studies published between 2010 and 2015 were included in the meta-analysis. There was less peri-implant vertical bone loss at implants using an AOT protocol than at implants using AR protocol (WMD -0.19, 95% CI -0.26 to -0.13; p<0.0001; random-effects model). In conclusion, the use of the AOT protocol with platform-switched Morse implants results in less bone loss than do AR procedures, but this effect may not be clinically relevant. The preservation of marginal bone level achieved with the AOT protocol may not enhance the aesthetics. These results should be interpreted with caution.


Resumo O objetivo desta revisão sistemática e meta-análise foi comparar a perda óssea vertical em implantes de carga imediata usando o protocolo de um pilar em um único momento (AOT) e implantes com remoção de pilar (AR). Esta revisão sistemática com meta-análise foi relatada de acordo com a declaração PRISMA, com orientação do Cochrane Collaboration Handbook. Foram identificadas 103 publicações na base de dados PubMed e nas listas de referência dos artigos examinados. Após a triagem de títulos e resumos, avaliou-se a elegibilidade de oito artigos de texto completo. Cinco estudos publicados entre 2010 e 2015 foram incluídos na meta-análise. Houve menos perda óssea vertical peri-implante em implantes usando o protocolo AOT do que nos implantes usando o protocolo AR (WMD -0,19, 95% IC -0,26 a -0,13; p <0,0001, modelo de efeitos aleatórios). Em conclusão, o uso do protocolo AOT com implantes Cone Morse associados a pilares com plataforma switching resulta em menos perda óssea do que os procedimentos AR, mas esse efeito pode não ser clinicamente relevante. A preservação do nível ósseo marginal alcançado com o protocolo AOT pode não melhorar a estética. Estes resultados devem ser interpretados com cautela.


Subject(s)
Humans , Male , Female , Middle Aged , Dental Abutments , Dental Implants , Alveolar Bone Loss , Immediate Dental Implant Loading
17.
Braz. dent. j ; 29(1): 30-35, Jan.-Feb. 2018. tab, graf
Article in English | LILACS | ID: biblio-888725

ABSTRACT

Abstract The purpose of this study was to evaluate different retention systems (cement- or screw-retained) and crown designs (non-splinted or splinted) of fixed implant-supported restorations, in terms of stress distributions in implants/components and bone tissue, by 3-dimensional (3D) finite element analysis. Four 3D models were simulated with the InVesalius, Rhinoceros 3D, and SolidWorks programs. Models were made of type III bone from the posterior maxillary area. Models included three 4.0-mm-diameter Morse taper (MT) implants with different lengths, which supported metal-ceramic crowns. Models were processed by the Femap and NeiNastran programs, using an axial force of 400 N and oblique force of 200 N. Results were visualized as the von Mises stress and maximum principal stress (σmax). Under axial loading, there was no difference in the distribution of stress in implants/components between retention systems and splinted crowns; however, in oblique loading, cemented prostheses showed better stress distribution than screwed prostheses, whereas splinted crowns tended to reduce stress in the implant of the first molar. In the bone tissue cemented prostheses showed better stress distribution in bone tissue than screwed prostheses under axial and oblique loading. The splinted design only had an effect in the screwed prosthesis, with no influence in the cemented prosthesis. Cemented prostheses on MT implants showed more favorable stress distributions in implants/components and bone tissue. Splinting was favorable for stress distribution only for screwed prostheses under oblique loading.


Resumo O objetivo deste estudo foi avaliar diferentes sistemas de retenção (cimentada x parafusada) e configuração da coroas (unitárias x esplintadas) de próteses fixas implantossuportadas em relação a distribuição de tensões nos implantes/componentes e tecido ósseo pela análise de elementos finitos 3D. Quatro modelos 3D foram simulados com auxílio dos programas Invesalius, e Rhinoceros 3D, e SolidWorks. Os modelos foram confeccionados simulando bloco ósseo de região posterior da maxila (tipo ósseo III), com 3 implantes cone Morse com 4,0 mm de diâmetro e diferentes comprimentos, suportando prótese metalocerâmica de 3 elementos. Os modelos foram processados pelos programas FEMAP e NEiNastran sob força axial de 400 N e oblíqua de 200N. Os resultados foram plotados através de mapas de tensão de von Mises (vM) (implantes e componentes) e tensão máxima principal (TMP) (tecido ósseo). Sobre o carregamento axial, não foi observada diferenças entre os diferentes sistemas de retenção e tipo de prótese na distribuição das tensões nos implantes/componentes, porém, sobre o carregamento oblíquo as próteses cimentadas apresentaram melhor distribuição de tensões em comparação com as próteses parafusadas, enquanto que as próteses esplintadas apresentou uma tendência de redução das tensões no implante do primeiro molar. No tecido ósseo as próteses cimentadas apresentaram melhor distribuição das tensões em comparação com as próteses parafusadas, independente do carregamento. A esplintagem foi favorável somente para as próteses parafusadas, não havendo influência sobre as próteses cimentadas. As próteses cimentadas sobre implantes cone Morse apresentam melhor comportamento biomecânico nos implantes/componentes e tecido ósseo. A esplintagem foi efetiva somente nas próteses parafusadas sob carregamento oblíquo.


Subject(s)
Humans , Dental Implants , Dental Prosthesis Design , Finite Element Analysis , Maxilla/surgery , Dental Abutments , Dental Stress Analysis
18.
Rev. ADM ; 74(6): 320-324, nov.-dic. 2017. ilus
Article in Spanish | LILACS | ID: biblio-973056

ABSTRACT

Un problema que sucede a menudo en la práctica clínica es la ausencia dental por diversos factores. Esto conduce a un gran desafío para surehabilitación, ya que debido a la pérdida dentaria se genera un colapsodel reborde alveolar, lo que ocasiona alteración en la morfología óseay gingival, o en diversos casos, se realizaron extracciones sin una planeación restaurativa, por lo que su sustitución implica mayores procedimientos. Una alternativa a esta ausencia dental es el diseño de póntico ovoide, siempre y cuando cumpla los requisitos clínicos para un mejor resultado estético, funcional e higiénico. El objetivo de este artículo es mostrar el empleo del póntico ovoide en el sector posterior con distintos aspectos clínicos: por un lado, utilizando la técnica de conformación del lecho gingival a presión y por el otro, la técnica directa postextracción, mediante prótesis fija de tres unidades en metal/porcelana.


A problem that often occurs in clinical practice is the dental absence caused by various factors. This leads to a great challenge for rehabilitation since due to tooth loss, a collapse of the alveolar ridgeis generated, causing an alteration in bone and gingival morphology; also, in many cases, extractions were made without restorative planning, so their replacement involves major procedures. An alternative to this dental absence is ovate pontic design, provided it meets the clinical requirements for better esthetic, functional and hygienic result. The aim of this article is to show the use of the ovoid pontic in the posterior region with different clinical aspects: first, using the technique of forming the gingival bed under pressure and on the other, postextraction direct technique through a three-unit fi xed prosthesis in metal/porcelain.


Subject(s)
Female , Humans , Adult , Middle Aged , Denture, Partial , Dental Prosthesis Design , Denture, Partial, Fixed , Tooth Extraction , Metal Ceramic Alloys , Immediate Dental Implant Loading , Gingiva/anatomy & histology , Denture, Partial, Temporary , Dental Abutments
19.
Braz. dent. j ; 28(3): 317-323, May-June 2017. tab, graf
Article in English | LILACS | ID: biblio-888643

ABSTRACT

Abstract The aim of this study was to evaluate the surface free energy (SFE), wetting and surface properties as well as antimicrobial, adhesion and biocompatibility properties of diamond-like carbon (DLC)-coated surfaces. In addition, the leakage of Escherichia coli through the abutment-dental implant interface was also calculated. SFE was calculated from contact angle values; R a was measured before and after DLC coating. Antimicrobial and adhesion properties against E. coli and cytotoxicity of DLC with human keratinocytes (HaCaT) were evaluated. Further, the ability of DLC-coated surfaces to prevent the migration of E. coli into the external hexagonal implant interface was also evaluated. A sterile technique was used for the semi-quantitative polymerase chain reaction (semi-quantitative PCR). The surfaces showed slight decreases in cell viability (p<0.05), while the SFE, R a, bacterial adhesion, antimicrobial, and bacterial infiltration tests showed no statistically significant differences (p>0.05). It was concluded that DLC was shown to be a biocompatible material with mild cytotoxicity that did not show changes in R a, SFE, bacterial adhesion or antimicrobial properties and did not inhibit the infiltration of E. coli into the abutment-dental implant interface.


Resumo O objetivo deste trabalho foi avaliar a energia livre de superfície (ELS), molhabilidade e propriedades de superfície assim como propriedades antimicrobianas, de adesão e biocompatibilidade de superfícies recobertas com Diamond-Like Carbon (DLC). Além disso, investigou-se a infiltração de Escherichia coli por meio da interface abutment-implante dentário. ELS foi calculada a partir dos valores de ângulo de contato; Ra foi medida antes e depois do revestimento com DLC. Foram avaliadas propriedades antimicrobianas e de adesão contra E. coli e citotoxicidade do DLC utilizando queratinócitos humanos (HaCaT). Além disso, também avaliamos a capacidade para impedir a migração de E. coli na interface do implante hexágono externo. Uma técnica estéril foi utilizada para a reação em cadeia da polimerase semi-quantitativa (PCR semi-quantitativo). As superfícies mostraram uma ligeira diminuição da viabilidade celular (p<0,05), enquanto a ELS, R a , adesão bacteriana, testes antimicrobianos e de infiltração não apresentaram diferenças estatisticamente significativas (p>0,05). Concluiu-se que o DLC demonstrou ser um material biocompatível levemente citotóxico que não mostra alterações na Ra , ELS, adesão bacteriana ou propriedades antimicrobianas e não inibiu a infiltração de E. coli na interface abutment-implante dentário.


Subject(s)
Humans , Biofilms , Carbon , Coated Materials, Biocompatible , Dental Abutments , Dental Implants , Diamond , Anti-Bacterial Agents , Bacterial Adhesion , Cell Line , Escherichia coli/isolation & purification , Escherichia coli/physiology , Keratinocytes/cytology , Polymerase Chain Reaction , Surface Properties
20.
Article in English | WPRIM | ID: wpr-141835

ABSTRACT

Dentists often place post and core buildups on endodontically treated abutments for crown and bridge restorations. This article analyzes the bio-mechanical purposes, advantages and disadvantages of placing a core or a post and core in an endodontically treated tooth and reviews literature on post and core biomechanics. The author assesses the scientific rationale of the claim that the main purpose of a post is to retain a core, or the claim that posts weaken teeth. More likely, the main function of a post is to help prevent the abutment, on which a crown is cemented, from fracturing such that the abutment separates from the tooth root, at a fracture plane that is located approximately and theoretically at the level of the crown (or ferrule) margin. A post essentially improves the ferrule effect that is provided by the partial fixed denture prosthesis. This paper also explores the difference between bio-mechanical failures of crowns caused by lack of retention or excess taper, versus failures due to a sub-optimal ferrule effect in crown and bridge prostheses.


Subject(s)
Crowns , Dental Abutments , Dentists , Dentures , Finite Element Analysis , Humans , Post and Core Technique , Prostheses and Implants , Tooth , Tooth Crown , Tooth Root
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