Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 54
Filter
1.
Braz. oral res. (Online) ; 33: e089, 2019. tab, graf
Article in English | LILACS | ID: biblio-1039299

ABSTRACT

Abstract The objectives of this double-blind randomized clinical trial were to compare (a) the clinical times and (b) the occurrence and severity of postoperative sensitivity, of posterior restoration that used a universal adhesive, in a self-etch or selective enamel-etching technique, along with incremental or bulk-fill composites (presented in syringes or capsules). A total of 295 posterior restorations were placed according to the following groups: SETB - self-etch/bulk-fill in syringe; SETC - self-etch/bulk-fill in capsules; SETI - self-etch/incremental; SEEB - selective enamel-etching/bulk-fill in syringe; SEEC - selective enamel-etching/bulk-fill in capsules; and SEEI - selective enamel-etching/incremental. Clinical time was assessed by a reason (s/mm3) between the total volume of resin inserted and the total time required to perform the restorations. Postoperative sensitivity was evaluated using two scales (Numeric Rating Scale and Visual Analogue Scale). Mean clinical time results, analyzed by Wald's Chi-square, showed significant statistical differences among all groups (p<0.001), indicating that the restorative strategy affected the time required for the restoration. A generalized estimating equation model statistical analysis, performed to compare postoperative sensitivity, showed that neither the restorative technique, the adhesive strategy nor the presentation mode of the bulk-fill composite affected the overall risk of postoperative sensitivity (4.06 [2.22-6.81]). The use of bulk-fill composite, presented in capsules or syringes, is less time consuming and does not increase the risk or intensity of postoperative sensitivity relative to the traditional incremental technique.


Subject(s)
Humans , Male , Female , Composite Resins/therapeutic use , Dental Restoration, Permanent/adverse effects , Dentin Sensitivity/etiology , Postoperative Complications/etiology , Reference Values , Syringes , Time Factors , Capsules , Double-Blind Method , Reproducibility of Results , Risk Factors , Treatment Outcome
2.
Braz. dent. sci ; 20(1): 6-11, 2017. Tab, ilus
Article in English | LILACS, BBO | ID: biblio-834113

ABSTRACT

Objective: This study aimed to compare the fracture resistance of endodontically treated roots filled by different obturation systems. Material and methods: Ninety-six maxillary central incisors were used and decoronated, retaining 12 mm of the roots. On the basis of obturation systems, the roots were randomly divided into 4 groups (n=24): Group1 (COGR): control group (unprepared, unfilled), Group 2 (AVGR): ActiV GP points/ActiV GP sealer, Group 3 (GPGR): Gutta percha points / AH plus sealer, and Group4 (GAGR): Gutta percha points/ActiV GP sealer. The last three groups were obturated with the single cone technique. The roots were then stored in 100% relative humidity at 37 °C for 2 weeks. A vertical compressive force was exerted in a universal testing machine until fracture occurred. Data were statistically analyzed using one-way ANOVA. Results: Mean (SD) failure loads for groups ranged from 920.51 ± 210.37 to 1113.44 ± 489.42 N. The fracture resistance between the different study groups indicated no statistical difference (p>0.05). Conclusions: ActiV GP system did not exert a significant effect on the fracture resistance of endodontically treated teeth.(AU)


Objective: Comparar a resistência à fratura de raízes tratadas endodonticamente obturadas através de diferentes sistemas. Materiais e Métodos: Noventa e seis incisivos centrais superiores foram utilizados, tiveram as coroas removidas, restando 12 mm de raíz. De acordo com o sistema de obturação, as raízes foram divididas em 4 grupos (n=24): Grupo1 (COGR): grupo controle (sem preparo, sem preenchimento), Grupo2 (AVGR): cones ActiV GP / cimento ActiV GP, Grupo3 (GPGR): cones de guta percha / cimento AH plus, e Grupo4 (GAGR): cones de guta percha / cimento ActiV GP. Os últimos três grupos foram obturados através da técnica de cone único. As raízes foram armazenadas em 100% de umidade relativa a 37 °C durante 2 semanas. Uma força compressiva vertical foi aplicada através de uma máquina de ensaio universal até ocorrer fratura. Os dados foram analisados estatisticamente através de ANOVA ­ 1 fator. Resultados: A carga média (SD) obtida no momento da falha variou entre 920.51 ± 210.37 até 1113.44 ± 489.42 N. A resistência à fratura entre os diferentes grupos estudados não indicaram diferença estatística. Conclusão: O sistema ActiV GP não exerceu um efeito significante na resistência à fratura em dentes tratados endodonticamente.(AU)


Subject(s)
Humans , Dental Cements/therapeutic use , Dental Restoration, Permanent/adverse effects , Gutta-Percha/therapeutic use , Tooth Fractures/drug therapy , Tooth, Nonvital/drug therapy , Analysis of Variance , Dental Cements/pharmacology , Dental Restoration Repair/methods , Tooth Crown/pathology
3.
Rev. cuba. estomatol ; 53(1): 93-103, ene.-mar. 2016. ilus
Article in Spanish | LILACS | ID: lil-778914

ABSTRACT

Las edades más afectadas, por la presencia de fracturas complicadas de corona, son la niñez y la adolescencia. En la mayoría de los pacientes se afectan los incisivos centrales superiores permanentes de incompleta formación apical. Esto implica una disminución de las capacidades de masticación, dicción y trae consigo implicaciones psicológicas en la adolescencia. El tratamiento consiste en la aplicación de una técnica de apicoformación que dificulta lograr al unísono la resolución de la afección estética. Nuestro propósito es describir un caso de apicoformación en incisivo central superior izquierdo, con cementación de cánula rígida, conformación de muñón y restauración estético-funcional definitiva. Un paciente de 8 años, masculino acude a consulta tras sufrir traumatismo dentoalveolar consistente en fractura complicada de corona. Los rayos X muestran ligero ensanchamiento periodontal y ápice inmaduro. Se le aplicó anestesia local, se realizó la extirpación pulpar total del diente afectado, y se colocó medicamento intraconducto. La culminación del tratamiento de restauración total coronaria se realizó con la cementación con ionómero de vidrio tipo II de una cánula rígida No. 22 hasta las dos terceras partes de la longitud de trabajo; alrededor de esta se conformó un muñón y corona de nano composite híbrido fotopolimerizable. Se controló evolución cada 24 días, durante tres meses para comprobar el estado de maduración apical. La cementación de la cánula rígida, consituye una alternativa para el tratamiento funcional de la apicoformación por fractura complicada de corona. Supone una rápida recuperación de las funciones bucodentales y psicológico-sociales integrales del paciente(AU)


The life periods most commonly affected by complicated crown fractures are childhood and adolescence. The teeth most frequently affected are permanent upper central incisors of incomplete apical formation, resulting in limitations in chewing and speech, as well as psychological effects in adolescence. The treatment consists in the application of an apex formation technique which makes it difficult to also solve the esthetic effect. It was our purpose to describe a case of apex formation in the upper left central incisor, with rigid stem cementation, stump conformation and definitive esthetic and functional restoration. An 8-year-old male patient attends consultation after undergoing dentoalveolar trauma consisting in complicated crown fracture. Radiography revealed slight periodontal expansion and an immature apex. A local anesthetic was applied to perform total pulpal removal of the affected tooth and place intracanal medicament. At the end of the total crown restoration treatment, cementation of a No. 22 rigid stem was performed with type II glass ionomer up to two thirds of the working length, and a hybrid photopolymerizable nanocomposite crown and stump were shaped around it. Evolution was checked every 24 days for three months to verify apical maturation status until total formation was achieved. Rigid stem cementation is an alternative for the functional treatment of apex formation due to complicated crown fracture. It is characterized by a fast, complete recovery of the patients oral-dental and psycho-social functions(AU)


Subject(s)
Humans , Male , Child , Dental Restoration, Permanent/adverse effects , Esthetics, Dental , Post and Core Technique/adverse effects , Tooth Injuries/complications , Tooth Injuries/therapy
4.
Braz. oral res. (Online) ; 30(1): e69, 2016. tab
Article in English | LILACS | ID: biblio-952012

ABSTRACT

Abstract This study evaluated the effects of 10% alphatocopherol on the fracture resistance of endodontically treated teeth subjected to tooth bleaching with hydrogen peroxide and immediately restored with composite resin. Fifty bovine incisors were selected, including 10 sound teeth that constituted the control group (G1 (C)). The remaining 40 teeth, which were endodontically treated, were divided into four groups (n = 10): G2 (CR), consisting of teeth immediately restored with composite resin; G3 (HP + CR), consisting of teeth subjected to tooth bleaching with 38% hydrogen peroxide and immediately restored with composite resin; G4 (HP + SA + CR), which received treatment similar to that used for G3, but with 10% sodium ascorbate gel applied after the bleaching protocol; and G5 (HP + AT + CR), which was similar to G4 but included 10% alphatocopherol gel as an antioxidant. After 24 h, composite restorations were performed, and teeth were subjected to a fracture resistance test at a speed of 0.5 mm/min in an electromechanical testing machine. The axial force was applied with an angle of incidence of 135° relative to the long axis of the root. Data were subjected to ANOVA and Tukey tests (p = 0.05). G1 exhibited the highest fracture resistance (p < 0.05). No significant differences among the other experimental groups were observed. The 10% sodium ascorbate and 10% alphatocopherol gels did not improve the fracture resistance of endodontically treated teeth subjected to bleaching with 38% hydrogen peroxide.


Subject(s)
Animals , Cattle , Tooth Bleaching/adverse effects , Tooth Fractures/prevention & control , Vitamins/chemistry , Tooth, Nonvital/drug therapy , alpha-Tocopherol/chemistry , Dental Restoration, Permanent/adverse effects , Ascorbic Acid/chemistry , Time Factors , Materials Testing , Reproducibility of Results , Analysis of Variance , Composite Resins/chemistry , Tooth Bleaching Agents/chemistry , Gels , Hydrogen Peroxide/chemistry
5.
Belo Horizonte; s.n; 2013. 64 p. ilus.
Thesis in Portuguese | LILACS, BBO | ID: lil-715937

ABSTRACT

O acabamento e polimento adequado das restuarações de resina composta são passos importantes na odontologia restauradora, que favorecem a estética, a saúde dos tecidos periodontais e a longevidade das restaurações. A hipótese testada neste estudo foi de similaridade entre os sistema de acabamento/polimento e do momento de sua aplicação sobre a rugosidade de superfície, microdureza e microinfiltração de uma resina de baixa contração à base de silorano. Os fatores em estudo neste experimento in vitroforam os sistemas de acabamento/polimento, em quatro níveis...


Subject(s)
Humans , Male , Female , In Vitro Techniques , Dental Polishing/trends , Composite Resins/administration & dosage , Dental Restoration, Permanent/adverse effects
6.
Braz. dent. j ; 22(2): 129-133, 2011. tab
Article in English | LILACS | ID: lil-583801

ABSTRACT

The aim of this study was to evaluate the accuracy on the diagnosis of secondary caries-like lesions simulated on esthetic restorations of different materials, changing the incidence vertical angle (IVA) of the x-ray beam. Twenty human teeth received MOD inlay preparations. In the experimental group (n=10), a round cavity was made in the floor of the proximal box to simulate the caries-like lesion. All teeth were restored with 3 composite resins (Charisma, Filtek-Z250 and TPH-Spectrum) at 3 moments. Two radiographic images were acquired with 0º and 10º IVA. Ten observers evaluated the images using a 5-point confidence scale. Intra- and interobserver reliability was analyzed with the Interclass Correlation Coefficient and the diagnostic accuracy was evaluated using the area under the ROC curve (Az), Friedman test and Wilcoxon test (α=0.05). Higher accuracy values were obtained with 10º IVA (Az=0.66, Filtek-Z250>Az=0.56, TPH-Spectrum) compared to 0º (Az=0.55, Charisma>Az=0.37, TPH-Spectrum), though without statistically significant difference (p>0.05). The detection of secondary caries-like lesions simulated on esthetic restorations of different materials suffered no negative influence by changing the IVA of the x-ray beam.


O objetivo deste estudo foi avaliar a precisão no diagnóstico de lesões iguais-à-cárie secundárias simuladas em restaurações estéticas de materiais diferentes, mudando o ângulo vertical de incidência (AVI) do feixe de raios-x. Vinte dentes humanos foram submetidos a preparo cavitário inlay MOD. No grupo experimental (n=10), no soalho da caixa de proximal, foi confeccionada uma cavidade esférica para simular lesões iguais-a-cárie. Todos os dentes foram restaurados com 3 resinas compostas (Charisma, Filtek-Z250, TPH-Spectrum), em três tempos diferentes. Duas imagens radiográficas foram adquiridas com 0 e 10 graus de AVI o feixe de raios-x. Dez observadores avaliaram as imagens usando uma escala de confiança de 5-pontos. A reprodutibilidade intra- e inter- observador foi analisada com o coeficiente de correlação interclasse e a precisão do diagnóstico foi avaliada usando a área sob a curva ROC (Az), o teste de Friedman e de Wilcoxon (α=0,05). Os mais altos valores de precisão (p>0,05) foram observados com o AVI em 10º (Filtek-Z250 Az=0,66>TPH-Spectrum Az=0,56) comparado com 0º (Charisma Az=0,55>TPH-Spectrum Az=0,37), porém, sem diferenças estatisticamente significantes (p>0,05). A detecção de lesões iguais-à-cárie secundárias simulada em restaurações estéticas de diferentes materiais não foi influenciada pela mudança de AVI do feixe de raios-x.


Subject(s)
Humans , Dental Caries , Dental Restoration, Permanent/adverse effects , Radiography, Bitewing/methods , Chi-Square Distribution , Composite Resins , Dental Caries/etiology , Dental Restoration, Permanent/methods , Esthetics, Dental , Observer Variation , ROC Curve , Statistics, Nonparametric
7.
Braz. dent. j ; 22(2): 134-139, 2011. graf, tab
Article in English | LILACS | ID: lil-583802

ABSTRACT

The most common treatment in general dental practice is the replacement of restorations affected by secondary caries or marginal deficiencies. Alternative treatments to replacement of defective restorations, such as marginal sealing, refurbishment and repair, have demonstrated improvement of their clinical properties with minimal intervention. The aim of this clinical study was to estimate the median survival time (MST) of marginal sealing, repair and refurbishment of amalgam and resin-based composite restorations with localized defects as a treatment to increase the restoration longevity. A cohort of 66 patients, with 271 class I and II restorations clinically diagnosed with localized defects was longitudinally assessed. Each restoration was assigned to one of the following 5 groups: Marginal Sealing (n=48), Refurbishment (n=73), Repair (n=27), Replacement (n=42), and Untreated (n=81). Two calibrated examiners assessed the restorations at baseline and annually during 4 years, using the modified Ryge criteria: marginal adaptation, anatomic form, roughness, secondary caries and luster. Fifty-two patients with 208 restorations were assessed after 4 years; the distribution of restorations in the groups was as follows: Marginal Sealing (n=36), Refurbishment (n=63), Repair (n=21), Replacement (n=28) and Untreated (n=60). Kaplan Meier test indicated that the Sealed margins group showed the lowest MST while the Repair group showed the highest MST for restorations examined after 4 years of follow up. Defective amalgam and resin-based composite restorations treated by sealing of marginal gaps, refurbishment of anatomic form, luster or roughness, and repair of secondary caries lesions, had their longevity increased.


Na clínica odontológica geral, o tratamento mais comum é a substituição de restaurações com cárie secundária ou defeitos marginais. Tratamentos alternativos às substituições de restaurações defeituosas, como selamento marginal, recuperação, e reparo, têm proporcionado melhorias das propriedades clínicas, com um mínimo de intervenção. O objetivo deste estudo foi avaliar o tempo médio de sobrevida (median survival time - MST, na sigla em inglês) de selamento marginal, recuperação e reparo de restaurações de amálgama e compósitos resinosos com defeitos localizados, como tratamento para aumentar a longevidade das restaurações. Este foi um estudo longitudinal envolvendo 66 pacientes com 271 restaurações classe I e II, clinicamente diagnosticadas e com defeitos localizados. Cada restauração foi incluída num dos seguintes grupos: Selamento Marginal (n=48), Recuperação (n=73), Reparo (n=27), Substituição (n=42) e Sem tratamento (n=81). Dois examinadores calibrados avaliaram as restaurações no início e anualmente durante 4 anos, usando os critérios de Ryge modificados: adaptação marginal, forma anatômica, rugosidade, cárie secundária e brilho. Cinqüenta e dois pacientes com 208 restaurações foram avaliados após 4 anos; a distribuição das restaurações nos grupos foi a seguinte: Selamento Marginal (n=36), Recuperação (n=63), Reparo (n=21), Substituição (n=28) e Sem tratamento (n=60). O teste de Kaplan Meier mostrou que o grupo do Selamento Marginal apresentou o menor valor de MST, enquanto que o grupo do Reparo mostrou o maior valor, para as restaurações avaliadas após o acompanhamento de 4 anos. As restaurações de amálgama e compósitos tratadas com selamento de fissuras marginais, recuperação da forma anatômica, brilho ou rugosidade e reparo de cárie secundária, tiveram aumento de longevidade.


Subject(s)
Adolescent , Adult , Aged , Aged, 80 and over , Humans , Middle Aged , Young Adult , Dental Restoration Failure , Dental Restoration Repair , Dental Restoration, Permanent/adverse effects , Chi-Square Distribution , Cohort Studies , Composite Resins , Dental Amalgam , Dental Marginal Adaptation , Dental Caries/etiology , Dental Restoration, Permanent/classification , Dental Restoration, Permanent/methods , Follow-Up Studies , Kaplan-Meier Estimate , Prospective Studies , Retreatment , Statistics, Nonparametric , Surface Properties
8.
Rev. Fac. Odontol. Porto Alegre ; 51(3): 23-29, set.-dez. 2010. ilus, tab, graf
Article in English | LILACS, BBO | ID: lil-719576

ABSTRACT

Objetivo: O objetivo deste estudo foi analisar as características de cárie secundária e sua relação com a presença de restaurações com defeitos marginais como gap, degrau negativa (NL, a falta de material restaurador) e degrau positiva (PL, saliência). Materiais e Métodos: Oitenta superfícies proximais de restaurações de resina classe II foram fotografados e analisados utilizando um microscópio estereoscópico (X40). Foi registrada a presença de cáries secundárias externas, gaps, NL, PL e após a remoção de restaurações, a presença de lesão interna. Todos os exames foram realizados em 10 pontos bem definidos. Resultados: A prevalência de cárie secundária e gap foram associados com margem gengival. As restaurações com defeitos marginais (NL e PL) não foram associados a qualquer local específico (vestibular, lingual ou gengival). Observou-se uma relação entre esses defeitos com a prevalência de cárie secundária. A presença da lesão interna foi associada com lesão externa. Embora, em 141 pontos foi observada lesão interna, sem a presença de lesão externa. A maioria destas lesões mostraram envolvimento de esmalte interno. Apenas 8 por cento tinham desmineralização restrito a dentina, que poderia sugerir cárie residuais.


Objective: The aim of this study was to analyze the features of secondary caries and their relationship with the presence of restorations marginal defects as gap, negative ledge (NL, lack of restorative material) and positive ledge (PL, overhang). Materials and methods: Eighty proximal surfaces of Class II resin restorations were photographed and analyzed using a stereomicroscope (X40). It was recorded the presence of external secondary caries, gaps, NL, PL and after the restorations removal, the presence of internal lesion. All the exams were done in 10 welldefined points. Results: The prevalence of secondary caries and gap were associated with gingival margin. The restorations marginal defects (NL and PL) were not associated with any specific location (buccal, lingual or gingival). It was observed a relationship between these defects with secondary caries prevalence (gap: p= 0.004; NL and PL: p= 0.017). This association could be explained by the biofilm accumulation usually observed in the interface tooth surface/ restoration marginal defects. The presence of internal lesion was associated with external lesion. Although, in 141 points was observed internal lesion without the presence of external lesion. The majority of these lesions showed internal enamel involvement. Only 8 percent had demineralization restricted to dentine, which could suggest residual caries. Conclusion: The results of this study showed that secondary caries lesion frequently began externally on the interface tooth/restoration, where diagnose, control and arrestment of the lesions is possible.


Subject(s)
Composite Resins , Dental Caries , Microscopy , Dental Restoration, Permanent/adverse effects , Surface Properties
9.
Rev. Fac. Odontol. Porto Alegre ; 51(2): 15-18, maio-ago. 2010. ilus, tab
Article in English | LILACS, BBO | ID: lil-719559

ABSTRACT

O objetivo deste estudo foi analisar morfologicamente o início da lesão de cárie secundária. Trinta e três superfícies proximais adjacentes a restaurações de resina classe II foram examinadas ao estereomicroscópio (40x) para a presença de carie e gap. Sessenta sítios (39 sadios, 7 com lesões, 14 adjacentes a lesões) foram preparados para exame utilizando microscopia de luz polarizada. As lesões foram observadas em 52,7% dos corte úmidos e 85,0% dos cortes secos. Os cortes secos demonstraram lesões maiores. Analises posteriores foram realizadas nos cortes secos. Cem por cento das secções observadas no estereomicroscópio, 87,2% das lesões hígidas, e 71,4% dos sítios adjacentes a lesões demonstraram áreas desmineralizadas. A análise morfológica indicou que a lesão cariosa inicia na superfície de esmalte externa na interface entre dente e restauração. Dois padrões distintos de desenvolvimento de carie foram observados, relacionados à direção dos prismas de esmalte: (1) a direção dos prismas no esmalte adjacente foi paralela à parede da cavidade (a parte mais profunda da penetração da cárie foi localizada na parede da cavidade), e (2) a direção dos prismas corria na direção apical (a parte mais profunda da penetração da cárie foi obliqua à parede da cavidade). O padrão 1 pode ser confundido por uma parede da lesão. A prevalência de lesões adjacentes às restaurações foi similar em sítios com (85,7%) e sem (84,0%) gaps. Os achados suportam o pressuposto de que o inicio da lesão de cárie secundária in vivo não está relacionado à presença de um gap e segue a direção dos prismas de esmalte.


The aim was to analyze morphologically the initiation of secondary caries lesion. 33 proximal surfaces adjacent to Class II resin restorations were examined by stereomicroscope (x40) for the presence of caries and gap. 60 sites (39 sound, 7 with lesions, 14 adjacent to lesions) were prepared for examination using polarized light microscopy. Lesions were observed in 52.7% of the wet sections and 85.0% of the dried sections. Dried ground sections displayed larger lesions. Further analyses were performed on dried sections. 100% of ground sections from the stereomicroscope carious sites, 87.2% from sound sites, and 71.4% from sites adjacent to lesions displayed demineralized areas. Morphological analysis indicated that caries lesion initiates at the external enamel surface in the interface between tooth and restoration. Two distinct patterns of caries development were observed, related to the direction of enamel rods: (1) the direction of the rods in the adjacent enamel was parallel to the cavity wall (the deepest part of caries penetration was located at the cavity wall), and (2) the direction of the rods ran in the apical direction (the deepest part of caries penetration was oblique to the cavity wall). The pattern 1 could be mistaken for a wall lesion. The prevalence of lesions adjacent to restorations was similar in the sites with (85.7%) and without (84.0%) gaps. The findings support the assumption that secondary caries initiation in vivo is not related to the presence of a gap and follows the direction of the enamel rods.


Subject(s)
Composite Resins , Dental Caries , Histology , Microscopy , Dental Restoration, Permanent/adverse effects
10.
Braz. dent. j ; 21(4): 327-331, 2010. tab
Article in English | LILACS | ID: lil-562094

ABSTRACT

The aim of this study was to evaluate the fracture strength of teeth with different cavosurface margin cavity preparations and restored with composite resin and different adhesive systems. Eighty premolars were randomly divided in 8 groups, as follow: G1- sound teeth; G2- MOD preparation (no restoration); G3- Adper Single Bond without bevel preparation (butt joint); G4- Adper Single Bond with bevel preparation; G5- Adper Single Bond with chamfer preparation; G6- Clearfil SE Bond without bevel (butt joint); G7- Clearfil SE Bond with bevel preparation; G8- Clearfil SE Bond with chamfer preparation. The adhesive systems were applied according to manufacturers’ instructions. Composite resin (Filtek Z250) was incrementally placed in all cavities. After 24 h, the specimens were tested in a universal testing machine at a crosshead speed of 0.5 mm/min. Data were analyzed statistically by ANOVA and Tukey’s test (fracture strength) and Fisher’s exact test (fracture pattern). The confidence level was set at 95 percent for all tests. Prepared and non-restored teeth showed the worst performance and G4 exhibited the highest fracture strength among all groups (p<0.05). In conclusion, all restorative treatments were able to recover the fracture strength of non-restored teeth to levels similar to those of sound teeth. Using a total-etch adhesive system with bevel preparation significantly improved the resistance to fracture.


O objetivo deste estudo foi determinar, in vitro, a resistência à fratura de pré-molares superiores com diferentes preparos do ângulo cavossuperficial e restaurados com resina composta com distintos sistemas adesivos. Foram selecionados 80 dentes, divididos em 8 grupos: G1- hígidos; G2- preparos M.O.D.; G3- Single Bond sem bisel; G4- Single Bond com bisel reto; G5- Single Bond com bisel chanfrado; G6- Clearfil SE Bond sem bisel; G7- Clearfil SE Bond com bisel reto e G8- Clearfil SE Bond com bisel chanfrado. Os grupos 3-8 foram restaurados com resina composta Z250, pela técnica incremental. Os corpos-de-prova foram submetidos ao teste de resistência à fratura em máquina universal de ensaios, a uma velocidade de 0,5 mm/min. Os dados foram analisados estatisticamente pelos testes ANOVA, Tukey e exato de Fisher (α=0,05). O grupo 2 apresentou resistência inferior aos demais e o grupo 4 mostrou-se mais resistente à fratura do que os demais grupos (p<0,05). Concluiu-se que o bisel reto foi o preparo mais efetivo quando associado a adesivos dentinários com condicionamento ácido prévio. Ambos adesivos dentinários usados foram capazes de devolver a resistência perdida com o preparo cavitário.


Subject(s)
Humans , Dental Marginal Adaptation , Dental Cavity Preparation/methods , Dental Cements/therapeutic use , Dental Restoration, Permanent/adverse effects , Tooth Fractures/etiology , Analysis of Variance , Bicuspid , Compressive Strength , Composite Resins/therapeutic use , Dental Instruments , Dental Stress Analysis , Dental Bonding/methods , Dental Cavity Preparation/instrumentation , Dental Restoration, Permanent/methods , Resin Cements/therapeutic use , Statistics, Nonparametric
12.
J. appl. oral sci ; 17(1): 61-65, Jan.-Feb. 2009. ilus, tab
Article in English | LILACS | ID: lil-502769

ABSTRACT

This study was carried out to evaluate in situ the influence of microleakage, surface roughness and biofilm control on caries formation around composite resin restorations. During 28 days, 12 volunteers wore palatal devices containing bovine enamel slabs restored with composite resin. Restorations were made without leakage, when the adhesive system was applied, or with leakage, when adhesive system was omitted. Half of the restorations in each group were finished and the remaining were finished and polished. In one side of the palatal device, biofilm was left to accumulate over the restored slabs, and in the other side dental slabs were brushed, to allow biofilm removal. There was an extraoral application of 20 percent sucrose solution (8x/day) over the enamel slabs. The formation of caries lesions (white spots) was evaluated by visual inspection under stereomicroscopy. Additionally, the dental slabs were sectioned and observed under polarized light microscopy. Data were submitted to Kruskal-Wallis test and Spearman's correlation test at 5 percent significance level. Polishing and bonding were not significant factors regarding white spot formation (p>0.05). Biofilm control (brushing) was associated with reduction of caries formation close to the restorations (p<0.01). Polarized light microscopy confirmed the visual inspection findings. These results suggest that while microleakage and surface roughness did not influence caries lesion formation, biofilm control may prevent the enamel demineralization.


Subject(s)
Adult , Animals , Cattle , Humans , Male , Young Adult , Composite Resins , Dental Caries/etiology , Dental Caries/prevention & control , Dental Restoration, Permanent/adverse effects , Biofilms , Bisphenol A-Glycidyl Methacrylate , Dental Polishing , Dental Leakage/complications , Dental Plaque/therapy , Dental Restoration, Permanent/methods , Recurrence , Resin Cements , Surface Properties , Toothbrushing , Young Adult
13.
Rev. odonto ciênc ; 23(1): 40-43, jan.-mar. 2008. tab
Article in Portuguese | LILACS, BBO | ID: lil-487781

ABSTRACT

Objetivo: Este trabalho avaliou a presença de inflamação gengival em áreas adjacentes a restaurações cervicais de classe V e sua relação com a lisura de superfície e adaptação à parede gengival das restaurações. Metodologia: Foram selecionados dezessete pacientes com ausência de fatores modificadores que alterassem o quadro da doença periodontal, excluindo os pacientes que estivessem em tratamento periodontal ou que concluíram em um prazo inferior a três meses. Os pacientes foram examinados por dois examinadores cegos. O examinador 1 avaliou a margem gengival vestibular em dente com restauração cervical de classe V e dentes adjacentes mesial e distal através de sondagem manual. O examinador 2 avaliou a restauração quanto à lisura e acabamento superficial, e à presença ou ausência de excesso de material. Resultados: Os resultados não foram estatisticamente significantes (testes Qui-quadrado e Teste de Fisher, P>0,05). Conclusão: Não houve relação significativa entre a presença de excesso de material restaurador e inflamação gengival, ou entre inflamação e qualidade de lisura da restauração.


Purpose: This study evaluated the presence of gingival inflammation related to class V restorations and its association with surface finishing and restoration adaptation. Methods: The sample was composed by 17 dental patients with no modifiers of periodontal disease. Exclusion criteria comprised subjects under current periodontal treatment or those who completed periodontal treatment less than three months before. All subjects were examined by two examiners in a blind design. Examiner 1 inspected the buccal gingival margin of teeth with class V restorations and the mesial and distal adjacent teeth by means of manual probing. Examiner 2 evaluated the restoration in relation to surface finishing and roughness, and presence/absence of filling overextension. Results: The results were not statistically significant (Chi-square test and Fisher test, P>0.05). Conclusions: No significant association was found between presence of filling overextension and gingival inflammation, or between inflammation and quality of restoration surface.


Subject(s)
Humans , Male , Female , Adult , Gingivitis , Dental Polishing , Dental Restoration, Permanent/adverse effects
14.
Dental Journal-Shahid Beheshti University of Medical Sciences. 2008; 26 (1): 27-31
in Persian | IMEMR | ID: emr-86122

ABSTRACT

Microleakage is an important problem for amalgam restorations and causes teeth discoloration, pulp irritation, sensitivity and caries. The aim of this study was to determine and compare the in vitro microleakage of 3 different dental amalgams with commercial names [Cinalux, Dentam, SS White] using a dentin bonding agent [Excite] and a cavity varnish [Compalite], in class V amalgam restorations. Class V preparation measuring 3x2x2 mm were cut on the facial surfaces of 78 freshly extracted human premolar teeth. The teeth were divided into 3 groups of 20 teeth and 2 groups of 9 teeth as positive and negative control. They were restored using the material of choice following manufacture's instructions, and thermocycled between 4+2 C° and 54 +/- 4 C° for 700 cycles in 105 seconds. The teeth were subsequently immersed in methylene blue dye and sectioned to allow assessment of microleakage with stereomicroscope. The obtained data were analyzed by Kruskal-wallis and Mann-whitney U tests. Non-parametric statistical analysis showed significant differences between 3 different amalgams when the cavities lined by Excite [P<0.05]. There was no significant differences between 3 different amalgams when the cavities lined by varnish. These results suggested dentin bonding agents reduced microleakage in comparison to varnish, and the type of amalgam is effective on microleakage


Subject(s)
Dental Restoration, Permanent/adverse effects , Dental Restoration, Permanent/methods , Tooth Discoloration/etiology , Dental Cavity Lining/adverse effects , Dental Cavity Lining/classification , Dental Cavity Lining/statistics & numerical data , Dentin-Bonding Agents/classification , Dentin-Bonding Agents , Dental Amalgam/adverse effects , Dental Amalgam/classification , Dental Amalgam , Dental Caries/etiology , Methacrylates/analogs & derivatives
15.
Arq. odontol ; 43(4): 149-154, out.-dez. 2007. tab
Article in English | LILACS, BBO | ID: lil-533415

ABSTRACT

This study assessed the influence of the application of bonding agents prior to or after matrix and wedge placement in the radiographic view of the adhesive layer in cervical walls of Class II composite resin restorations and correlated the findings with marginal leakage. Standard cavities were prepared in the mesial and distal faces of human molars, with cervical margins placed in dentin/cementum. Restorations were made using metallic matrix bands and wooden wedges. The microhybrid composite Filtek Z250 (3M ESPE) and two adhesive systems – Single Bond 2 (SB-3M ESPE) and Scotchbond Multi-Purpose (SMP-3M ESPE) – were used, thus defining five groups (n= 12): [SB1] and [SMP1]- matrix and wedge placed after bonding application; [SB2] and [SMP2]-matrix and wedge placed prior to bonding application; [Control] – restorations without adhesive system. Bitewing radiographs from each tooth were obtained and the view or not of the adhesive layer in the cervical wall of each restoration was observed under magnification (40x). Specimens were thermalcycled and dye penetration (0.5% basic fuchsine) evaluated under magnification (40x). Data were submitted to Kruskal-Wallis and Spearman correlation tests (p=0.05). The placement of matrix and wedge before bonding agent application increased the view of the adhesive layer only for SB (p<0.001). Matrix did not influence marginal leakage, and no significant relationship between radiographic view of adhesive layerand marginal leakage (r=-0.020; p =0.877) could be observed. In conclusion, SB presented better sealingability than SMP (p<0.01).


Subject(s)
Humans , Dentin-Bonding Agents/adverse effects , Dental Leakage/diagnosis , Composite Resins/adverse effects , Radiography, Bitewing , Dental Restoration, Permanent/adverse effects
16.
Arq. odontol ; 42(3): 211-220, jul.-set. 2006. ilus, tab, graf
Article in Portuguese | LILACS, BBO | ID: lil-462909

ABSTRACT

As resinas compostas vêm sendo largamente utilizadas em dentes posteriores. Objetivou-se realizar uma revisão sistemática acerca das publicações de avaliações clínicas do emprego deste material em restaurações que envolvessem a superfície oclusal e/ou proximal de pré-molares e molares de forma a avaliar os critérios empregados para execução das mesmas. As publicações foram selecionadas aleatoriamente a partir de uma pesquisa bibliográfica a partir dos pré-requisitos: publicação em revista indexada e recente (últimos 5 anos). Após a análise dos dados, verificou-se que há necessidade de padronização dos estudos clínicos de compósitos em dentes posteriores para facilitar a análise comparativa.


Subject(s)
Composite Resins/classification , Dental Restoration, Permanent/adverse effects , Data Interpretation, Statistical
17.
Braz. dent. j ; 16(1): 35-38, Jan.-Apr. 2005. tab
Article in English | LILACS | ID: lil-415741

ABSTRACT

Este estudo in vitro avaliou a microinfiltração marginal em cavidades classe V preparadas com jato de óxido de alumínio e restauradas com diferentes sistemas ionôméricos. As cavidades foram preparadas nas superfícies vestibular e lingual de 15 terceiros molares hígidos e foram divididas em três grupos com 10 cavidades cada um. Os seguintes materiais foram utilizados: no grupo I, cimento de ionômero de vidro convencional (Ketac Fil) e nos grupo II e III, cimentos de ionômero de vidro modificado por monômeros resinosos (Vitremer e Fuji II LC, respectivamente). O preparo cavitário foi realizado por meio da aplicação do jato de óxido de alumínio (Kreativ Mach 4.1; New Image), com partículas de 27,5 µm. Após a restauração das cavidades, os dentes foram armazenados durante 24 h em água destilada a 37ºC, polidos e então submetido a termociclagem (500 ciclos), imersos em Rodamina B a 0,2% por 24 h, incluídos e seccionados. A análise da microinfiltração marginal foi realizada por meio de um microscópio óptico acoplado a uma câmera e a um computador. As imagens obtidas foram digitalizadas e analisadas utilizando um software que permite uma análise quantitativa padronizada da microinfiltração, em milímetros. As médias (%) obtidas foram: oclusal - I: 25,76 mais ou menos 34,35; II: 20,00 mais ou menos 42,16; III: 28,25 mais ou menos 41,67; cervical I: 23,72 mais ou menos 41,84; II: 44,22 mais ou menos 49,69; III: 39,27 mais ou menos 50,74. Os dados foram submetidos à análise estatística, utilizando os testes de Kruskall-Wallis e Wilcoxon. Não houve diferença estatisticamente significante (p>0.05) entre os materiais testados nem entre as margens oclusal e cervical. Conclui-se que em cavidades classe V preparadas com ar abrasão e restauradas com cimentos de ionômero de vidro convencional e modificados por monômeros resinosos não houve completo vedamento marginal.


Subject(s)
Humans , Air Abrasion, Dental , Dental Cavity Preparation/methods , Dental Leakage/etiology , Dental Restoration, Permanent/adverse effects , Glass Ionomer Cements , Aluminum Oxide , Air Abrasion, Dental/methods , Composite Resins/chemistry , Dental Marginal Adaptation , Glass Ionomer Cements/chemistry , Image Processing, Computer-Assisted , Maleates , Molar , Resins, Synthetic/chemistry , Statistics, Nonparametric , Video Recording
18.
Arq. odontol ; 41(1): 005-19, 2005. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-849923

ABSTRACT

A variação no julgamento clínico das restaurações é um problema que afeta a maioria dos profissionais, resultando em prejuízos biológico e financeiro. Este trabalho teve como objetivo avaliar um programa de treinamento participativo para padronização de critérios na avaliação de restaurações de amálgama. Um grupo de cinco professores de Clínica Integrada de um Curso de Odontologia avaliou 28 dentes permanentes extraídos contendo restaurações de amálgama, antes e após a participação num programa de treinamento. Foram utilizados os exames visual e radiográfico e a avaliação final foi agrupada em quatro categorias de julgamento: satisfatória, necessita de substituição total, necessita de substituição parcial ou necessita de acabamento e polimento, com justificativa da opção feita. O programa de treinamento foi constituído de quatro sessões quinzenais: fundamentação teórica, calibração com slides, calibração com dentes extraídos e elaboração da tabela de critérios. Os resultados mostraram um aumento após o treinamento tanto no nível de concordância inter-examinadores (índice kappa) como no nível de acurária em relação ao padrão ouro (validade), e estes se mantiveram, mesmo decorridos cinco meses após o término do programa de trinamento. Estes resultados sinalizam a possibilidade da utilização desta metodologia para outras calibrações e outros grupos


Subject(s)
Dental Amalgam/analysis , Dental Amalgam/therapeutic use , Dental Restoration, Permanent/adverse effects , Judgment
19.
Arq. odontol ; 40(3): 237-244, 2004.
Article in Portuguese | LILACS, BBO | ID: biblio-849890

ABSTRACT

Clinical applications for glass ionomers include restoration of erosive lesions, prosthesis cementation, core material and pediatric restorations. In addition, glass ionomers have also been used as orthopedic granular bone substitute. The treatment of periodontal furcation defects normally consist of scaling and root planning, apically-positioned flaps, tunneling, root amputation, root resection, guided tissue regeneration or bone graft. Recently, glass ionomer cement was introduced an option for the treatment of infra bony and furcation defects. The aim of this study is to provide the reader an update on the scientific evidences on the use of glass ionomer cements in treatment of root caries and furcation defects


Subject(s)
Glass Ionomer Cements , Dental Restoration, Permanent/adverse effects , Furcation Defects/diagnosis
20.
Rev. Asoc. Odontol. Argent ; 92(1): 22-26, ene.-mar. 2004. ilus
Article in Spanish | LILACS | ID: lil-360184

ABSTRACT

Seis de la tarde del primer día, refugio, cansado por el acarrero delt ramo incial, me apresto a descargar la mochila apurado pr cargar agua de deshielo que corre cerca al refugio antes que se congele al caer el sol. De repente, un dolor de muelas soportable (hiperemia). Se va incrementando (pulpitis) y haciéndose imposible de soportar; no traje nada para el dolor pero el guía de montaña alivia mi angustia de psar una noche terrible o, lo que es peor, terminar mi aventura. Una bolita de algún embebida en un líquido (eugenol), la coloco en la caries, previo secado con algodón también, una pasata que lka colocamos con algún instrumento pequeño que haga las veces de espátula la mantendrá en su lugar. Situaciones como esta pueden sucederles a cualquier persona. Algunas, de fácil resolución, otras, incapacitantes, dependiendo también de la distancia (horas o días) a algún centro urbano. Si les han extraído un elemento dentario recientemente no olviden que tienen que dejar pasar al menos 48 hs antes de realizar un esfuerzo físico importante. Lo aconsejable, y aunque parezca un detalle menor sería pasar por el odontólogo que, a pesar de no ser un santo de devoción de muchos, suele darles una cierta tranquilidad al poner vuestra boca en condiciones aceptables para excursiones en la que estarán a kilómetros de distancia de su consultorio.


Subject(s)
Humans , Emergency Treatment , Mouth Diseases , Tooth Diseases , Atmospheric Pressure , Tooth Avulsion/etiology , Tooth Avulsion/therapy , Cellulitis , Glass Ionomer Cements/therapeutic use , Dental Pulp Diseases , Eugenol , Periodontal Abscess , Pulpitis , Dental Restoration, Permanent/adverse effects , Tooth Fractures
SELECTION OF CITATIONS
SEARCH DETAIL