ABSTRACT
A presença de incisivos laterais conoides compromete a harmonia do sorriso. O presente artigo tem como objetivo apresentar um relato de caso de reanatomização de laterais conoides, com consequente fechamento dos diastemas anterossuperiores e restabelecimento de guia canina. Entre as opções de tratamento optou-se pela restauração direta com resina composta por apresentar-se como o método que melhor se adaptou às expectativas e anseios da paciente. Ao final, o processo resultou em um sorriso esteticamente agradável não somente em termos dentais, mas também com relação à face da paciente, proporcionando um aspecto harmonioso e natural ao sorriso...
Diastema and peg-shaped teeth may compromise patients smile harmony. This article presents a case report of reshaping peg-shaped lateral incisors and subsequent closure of the maxillary anterior spacing and reestablishment of the canine guidance. Among the treatment options, direct resin composite restoration was selected because it was the treatment that best adapted to the expectations and desires of the patient. An excellent result was achieved with an aesthetically pleasing smile not only in dental terms, but also in relation to the face of the patient...
Subject(s)
Humans , Female , Dental Enamel , Esthetics, Dental , Incisor , Composite Resins , Dental Restoration, Permanent , SmilingABSTRACT
This study evaluated the microtensile bond strength of a universal adhesive system applied to deep dentin under different bonding strategies.Material and Methods: Fifteen human third molar shad the coronal portion removed exposing deep dentin and were assigned into 3 groups according to the adhesive system: G1(control): 2-steps totaletch(Adper Single Bond 2, 3M ESPE); G2: 1-stepself-etch universal adhesive (Scotchbond Universal,3M ESPE); G3:2 steps total-etch universal adhesive(Scotchbond Universal, 3M ESPE). Composite build up swere performed on the dentin surfaces and after water storage for 24 h, teeth were sectioned to obtain40 bonded beams per group with sectional areaof 0.9 mm2. The specimens were submitted to the microtensile bond strength (μTBS) test until failure.Statistical analyses were computed using one-wayANOVA (p = 0.05). Results: The mean μTBS (inMPa) were G1 = 22.27, G2 = 22.85 and G3 = 20.3.After statistical analysis, no significant differences were observed among the groups. Conclusions:Universal adhesive system performed similarly tothe total-etch adhesive and was not affected by theadhesion strategy...
O estudo avaliou a resistência de união à microtração de um sistema adesivo universal aplicado em dentina profunda sob diferentes estratégias adesivas. Material e Métodos: 15 terceiros molares tiveram a porção coronária removida,expondo dentina profunda, sendo então divididos em 3 grupos de acordo com o sistema adesivo: G1 (controle) sistema adesivo convencional de 2 passos e condicionamento ácido total (Adper SingleBond 2, 3M ESPE); G2: sistema adesivo universal,1 passo, autocondicionante (Scotchbond Universal,3M ESPE); G3: sistema adesivo universal, 2 passos e condicionamento ácido total (Scotchbond Universal,3M ESPE). As porções coronárias foram reconstruídas em resina composta e após 24 h em água destilada os espécimes foram seccionados para obtenção de 40 filetes por grupo. Os filetes foram submetidos ao teste de microtração à velocidade de 0,5 mm/min e os dados analisados estatisticamente. Results:Não foram observadas diferenças estatísticas entre os grupos, sendo as médias de resistência de união(MPa): G1 = 22,27, G2 = 22,85 and G3 = 20,3.Conclusão: O sistema adesivo universal apresentou performance similar ao sistema adesivo convencional e seu desempenho não foi afetado pela estratégia adesiva utilizada...
Subject(s)
Humans , Dentin , Dentin-Bonding Agents , Tensile StrengthABSTRACT
Introduction: The rehabilitation of teeth by means of ceramic indirect restorations has been widely performed. Previous studies has shown the effectiveness of silane coupling agents on improving the bond strength of the adhesion of resin cements to ceramics; however, some studies question the use of silane. Objective: To evaluate the effect of silane application on the microtensile bond strength of an auto-adhesive luting material to a lithium disilicate glass-ceramic. Material and methods: Two blocks (9x11x4mm) of lithium disilicate glass-ceramic had one of their surfaces polished (# 220, 360, 600 grit silicon-carbide abrasive papers) and cleaned ultrasonically. The ceramic blocks were then divided into two groups according to the surface treatment: G1 (control group): etched with 10% hydrofluoric acid for 20s and silane coated; G2: etched with 10% hydrofluoric acid for 20s. After building two blocks of composite resin (Filtek Z350) with the same dimensions of the ceramic blocks, the self-adhesive resin cement (SpeedCEM) was applied directly to the ceramic surface and the resin block was seated on the cement. After storage (24h, 37°C), the ceramic-cement-composite blocks were cut with an Isomet low-speed diamond saw machine producing sticks, which were loaded to failure at a crosshead speed of 0.5 mm/min. The type of fracture was analyzed under an optical microscope. The results were statistically analyzed using the Student t test. Results: The mean microtensile and standard deviations in megaPascals were: G1 = 21.32 (± 4.36) and G2 = 16.55 (± 4.92). Statistical analysis showed that the bond strength was not significantly affected by the surface treatment with silane. Most of the fractures occurred within the adhesion zone. Conclusion: The application of silane had no significant effect on the bond strength between lithium disilicate glass-ceramic and self-adhesive resin cement.