Effect of immediate dentin sealing on load-bearing capacity under accelerated fatigue of thin occlusal veneers made of CAD-CAM glass-ceramic and resin composite material.

OBJECTIVE: The objective of this study was to assess the influence of immediate dentin sealing (IDS) on the fatigue behavior of laminate occlusal veneers fabricated with CAD/CAM lithium disilicate ceramic and resin composite. METHODS: Forty sound human molars were prepared and randomly divided into 4 groups (n = 10): RC-IDS+ (IDS and resin composite occlusal laminate veneer); RC-IDS- (resin composite occlusal laminate veneer without IDS); LD-IDS+ (IDS and lithium disilicate laminate veneer); LD-IDS- (lithium disilicate occlusal laminate veneer without IDS). The restorations were obtained using a digital workflow. After surface conditioning and bonding, thermocycling and accelerated fatigue tests (20 Hz, 5000 cycles with an initial load of 300 N, step-size of 100 N for 10,000 cycles, up to 1000 N, and then a step-size of 50 N until failure) were conducted. Fatigue data were recorded for both outcomes (crack or fracture) and statistically analyzed. Fractographic and adhesive interface analysis were conducted. RESULTS: The indirect resin composite groups showed better fatigue behavior compared to lithium disilicate. IDS only had a positive effect for the survival of resin composite restorations for the 'fracture' outcome. Evident presence of micro-gaps at the adhesive interface in the LD-IDS- group could be noted. SIGNIFICANCE: Immediate dentin sealing improved fatigue resistance behavior of resin composite occlusal veneers. However, this effect was not observed in lithium disilicate veneers.

Enamel hypoplasia: challenges of esthetic restorative treatment.

Enamel defects, such as white or yellow-brown spots, usually cause problems that are more esthetic than functional. Enamel hypoplasia may be the result of hereditary, systemic, or local factors. Dental trauma is a local etiologic factor. It is relatively common in the primary dentition and can cause defects on the surface of permanent successors. Treatment for such defects can differ, depending on the depth of the spots. For deeper white-spot lesions, a composite resin restoration may be necessary. This is an excellent mode of treatment, due to both its low cost and its conservation of healthy tooth structure. The objective of this case report is to describe composite resin restoration of a maxillary central incisor affected by enamel hypoplasia.

Compósitos em incisivos lateriais conoides: ciência e arte / Composite resin restorations in peg-shaped lateral incisors: science and art

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 patient’s 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...

Silorane adhesive system: a case report.

Silorane-based composite resin requires a specific adhesive system: a 2-step self-etching adhesive. Clinical protocols are well established and are based on the principles of adhesion to mineralized dental tissues. In this paper, we present a clinical application of the silorane adhesive system in a class-II restoration using silorane-based composite resin.