Effects of different concentrations of carbamide peroxide and bleaching periods on the roughness of dental ceramics.

The wide use of dental bleaching treatment has brought concern about the possible effects of hydrogen peroxide on dental tissue and restorative materials. The objective of this study was to evaluate in vitro the effect of nightguard bleaching on the surface roughness of dental ceramics after different periods of bleaching treatment. Fifteen specimens of 5 × 3 × 1 mm were created with three dental ceramics following the manufacturers' instructions: IPS Classic (Ivoclar-Vivadent); IPS d.

Effect of different concentrations of carbamide peroxide on microhardness of dental ceramics.

Purpose: To evaluate the effect of 10% and 16% carbamide peroxide bleaching agents on microhardness of dental ceramics after different periods of bleaching treatment.

Methods: 15 specimens with 5 x 3 x 1 mm3 were created with four dental ceramics following manufacturers' instructions: IPS Classic (Ivoclar-Vivadent); IPS d.Sign (Ivoclar-Vivadent); EX3 (Noritake); VMK-95 (Vita).

An alternate technique for management of acute closed locks.

The article introduces an alternative method for manipulation and reduction of acute closed locks. The method is described as the Assisted Lateral Reduction Technique (ALRT). The authors have used the ALRT on more than 150 patients and found it more effective and easier to administer than the more common manipulation and reduction techniques (MRT) in the management of acute closed locks which have been extensively documented in the literature.