Issues

A one-year clinical trial showed that a low-shrinkage silorane-based composite exhibited a similar performance to conventional dimethacrylate-based composites when used to repair composite resin restorations. This corroborates in vitro studies suggesting that bonding of silorane-based composites to old dimethacrylate-based composites can be a viable clinical procedure.

For the in-office technique, lower prevalence of tooth sensitivity may be expected when using in-office 38% hydrogen peroxide (HP) agent when compared with the 35% HP agent, which may be related to the presence, type, and concentration of desensitizing agents in the bleaching agents. The use of 10% carbamide peroxide (CP) or 20% CP home-use and 35% HP or 38% HP in-office treatments may have the same effectiveness in bleaching teeth.

Fiber inserts incorporated at the gingival floor of class II composite restorations resulted in a highly significant reduction of microleakage. Also, silorane composites based on a ring-opening mechanism showed reduced microleakage.

The dentin bond strengths of indirect composite inlay restorations cemented with self-adhesive and self-etching resin cements were reduced after loading, while microleakage increased. There were no significant differences in microtensile bond strengths and microleakage between the three resin cements.

In the case of bonding the fragment of a fractured tooth, giving the fragment time to become rehydrated and considering treatment during a second appointment (scheduled 24 hours or more after the first visit) can lead to better bonding.

The nanofilled glass ionomer provides intermediate resistance to chemical and mechanical degradation among the glass ionomer cements (conventional and resin-modified) and nanofilled composite.

The 35% hydrogen peroxide bleaching gel potentiated the structural and histomorphological changes induced by the accumulation of biofilm on the enamel surface.

Bleaching therapies with 20% or 35% hydrogen peroxide gels influenced composite resin color and fluorescence. No influence on opacity was observed.

Surface topography (size and depth of depressions) plays a more important role than surface roughness in biofilm formation of Streptococcus mutans in the presence of saliva.

Alginate substitute materials are inexpensive polyvinyl siloxane (PVS) impression materials that exhibit better detail reproduction and tear strength than alginate. Alginate substitute materials do show slightly more outgassing and resulting cast porosity than traditional alginates, particularly when they are poured soon after mixing. To reduce cast surface porosity, a minimum pouring delay of 60 minutes is suggested.

The microhardness of self-adhesive, dual-cure resin cements, when used to lute fiber posts, depends on the material brand, with higher values of microhardness verified at the coronal third. Because changes in microhardness were detected between 24 hours and 7 days after luting, clinicians should take this into account to prevent damage to the biomechanical bonding of the post cement-dentin immediately following cementation.

In the right situation, A 7/8 gold crown can be the most esthetic, as well as, the most durable alternative to a ceramic restoration.

The clinical case described is a multidisciplinary clinical technique article. It showcases the need for a multidisciplinary approach to certain restorative cases and offers a number of possible options in addition to the one utilized for this patient.

Deep dentin does not serve as a suitable bonding substrate for contemporary bonding agents. The use of natural collagen cross-linkers like sodium ascorbate and proanthocyanidin as dentin pretreatment agents greatly improves bond strength to deep dentin.

In order to avoid the negative effect of contamination of composite resins with powdered latex gloves on the bond strength of two-step self-etching adhesive systems, the use of unpowdered latex gloves is recommended with these adhesive systems.