ABSTRACT
Objetivo: O presente trabalho teve por objetivo desenvolver um protótipo de instrumental clínico que possibilita a padronização do volume e forma da massa de resina composta para o uso em procedimentos restauradores direto, além de relato de caso demonstrando a aplicabilidade do protótipo. Para isso, foi selecionada uma empresa produtora de instrumentos odontológicos e ativa no mercado nacional com registro na ANVISA. Tendo como base um calcador de Holemback número 6, esse, foi reconfigurado geometricamente afim de atingir os requisitos necessários para o desenho pretendido. Após a etapa de desenvolvimento, esse novo instrumento foi utilizado para o relato de um caso clínico de restauração direta de resina composta envolvendo esmalte e dentina das superfícies ocluso-distal do dente 15 e oclusal do dente 16. Os tecidos dentais foram hibridizados pela técnica adesiva associada de condicionamento seletivo do esmalte com ácido fosfórico e aplicação de sistema adesivo auto-condicionate (Clearfil SE Bond, Kuraray, Japão) em esmalte e dentina. A restauração foi realizada com a resina composta Z350 XT (3M ESPE, USA) nas cores A1 e A2B. Conclusão: A utilização do protótipo de instrumental auxilia na execução de restaurações direta de resina composta com o favorecimento ao controle das tensões geradas pela contração de polimerização e poderá ter papel importante no treinamento restaurador dos profissionais(AU)
Objective: The objective of this work was to develop a prototype of clinical instruments that allows the standardization of the volume and shape of the composite resin mass for use in direct restorative procedures, besides a case report demonstrating the applicability of the prototype. For this, a company was selected to produce dental instruments and active in the national market with ANVISA registration. Based on a Holemback number 6 presser foot, it was geometrically reconfigured to meet the requirements for the intended design. After the development stage, this new instrument was used to report a clinical case of direct restoration of composite resin involving enamel and dentin of the occlusal-distal surfaces of the tooth 15 and occlusal of the tooth 16. The dental tissues were hybridized by the adhesive technique associated with the selective conditioning of the enamel with phosphoric acid and the application of auto-conditioning adhesive system (Clearfil SE Bond, Kuraray, Japan) in enamel and dentin. The restoration was performed with the composite resin Z350 XT (3M ESPE, USA) in colors A1 and A2B. Conclusion: The use of the prototype of auxiliary instruments in the execution of direct restorations of composite resin with the favoring to control the tensions generated by the polymerization contraction and may play an important role in the restorative training of professional(AU)
Subject(s)
Humans , Female , Middle Aged , Composite Resins , Dental Restoration, Permanent , Dental LeakageABSTRACT
OBJECTIVES: To evaluate the influence of resin cements on cuspal deflection, fracture load and failure mode of endodontically-treated teeth restored with composite resin inlays. MATERIALS AND METHODS: Forty maxillary premolars were randomly divided into four groups: G1 (sound teeth, control), G2 (RelyX ARC), G3 (RelyX Unicem) and G4 (Maxcem Elite). The teeth from groups 2, 3 and 4 received mesial-occlusal-distal preparations and endodontic treatments. Impressions were taken with vinyl polysiloxane and poured using type IV die stone. Inlays with Z250 composite resin were built over each cast and luted with the resin cements. A 200-N load was applied on the occlusal surface and the cuspal deflection was measured using a micrometer. The specimens were then subjected to an axial load until failure occurred. The resulting failure mode was analyzed. RESULTS: The means for cuspal deflection (µm) and fracture load (N) followed by the same letter represent no statistically significant difference based on ANOVA and Tukey's test (p < 0.05). Cuspal deflection: G1 = 4.7 (± 1.7)(a), G2 = 12.0 (± 8.9)(a), G3 = 39.0 (± 27.0)(b) and G4 = 56.8 (± 18.2)(b). Fracture load: G1 = 1982 (± 893)(a), G2 = 690.9 (± 225.5)(b), G3 = 679 (± 193.6)(b) and G4 = 465.5 (± 121.6)(b). G1 presented cusp fractures only at the cement-enamel junction (CEJ). There was a high frequency of cusp fractures below the CEJ in G2, G3 and G4. CONCLUSIONS: Composite resin inlays luted with resin cements do not recover the strength of sound teeth. However, teeth restored with composite resin inlays and luted with RelyX ARC can withstand mechanical fatigue longer before failure occurs than those luted with RelyX Unicem and Maxcem Elite.
Subject(s)
Cuspid/physiology , Dental Stress Analysis , Endodontics , Resin Cements , Analysis of Variance , HumansABSTRACT
OBJECTIVE: This study analyzed the adhesive-dentin interface when Nd:YAG and Er:YAG lasers were applied to dentin. BACKGROUND DATA: Lasers applied to dentin cause morphological changes of this tissue. Because adhesive systems bond to dentin through the hybrid layer, it is important to investigate the adhesive-dentin interface when dentin is irradiated with lasers. METHODS: The occlusal dentin of 12 human molars was exposed and polished with 400 and 600 grit silicon carbide abrasive paper. Teeth were randomly divided into six groups: Group 1, adhesive system Adper Single Bond 2 (SB); Group 2, adhesive system Clearfil SE Bond (CSB); Group 3, Nd:YAG laser (60 mJ, 15 Hz, 0.9 W) and SB; Group 4, Nd:YAG laser (60 mJ, 15 Hz, 0.9 W) and CSB; Group 5, Er:YAG (200 mJ, 4 Hz, 0.8 W) and SB; Group 6, Er:YAG (200 mJ, 4 Hz, 0.8 W) and CSB. Blocks of composite resin were built upon the adhesive system. Tooth-resin sets were cut in a mesio-distal direction, resulting in four samples for each group. Surfaces were polished until 1200 grit silicon carbide abrasive paper, followed by diamond pastes. Samples were demineralized, deproteinized, dried, metalized, and evaluated by scanning electron microscopy. RESULTS: SB formed a thicker hybrid layer, with resin tags longer than CSB. Nd:YAG laser application on the dentin surface, prior to the adhesive procedures, resulted in a thinner hybrid layer with fewer resin tags. Er:YAG laser application on the dentin surface, prior to the adhesive procedures, did not allow the formation of a hybrid layer but formed resin tags. CONCLUSION: Nd:YAG and Er:YAG laser changed the adhesive-dentin interface.
