Comparison of shear bond strength of metal castings luted to dentine using resin cements

The purpose of this study was to investigate the shear bond strength of metal discs luted to dentine. In this study three resin luting cements i.e. Panavia F [Group I], Variolink II [Group II] and Superbond C and B [Group III] were compared to demonstrate which material was more superior to bond sandblasted cobalt chromium alloy to dentine. Groups I, II and III were compared using ANOVA, P < 0.05. Panavia F demonstrated significantly higher bond strengths than Variolink II or SuperBond C and B. SuperBond C and B had significantly higher shear bond strength than Variolink II. Thus, there were significant differences among the tested resin luting cements for bonding metal discs. Panavia F was found to give the highest shear bond strength within the limitations of this study followed by Superbond C and B and Variolink II

Mandibular second premolar with three canals

Mandibular premolars often show aberrant anatomy varying from one to three canals. The incidence of occurrence of 3 canals has been recorded to be 0.46 - 0.5%. We report a case of mandibular second premolar with 3 canals, which was initially diagnosed radiographically by shift cone technique and confirmed by clinical examination. The tooth was successfully obturated and restored. It remained asymptomatic at one month recall

Polishing of contemporary aesthetic restorative material: a review

Efficient and simple polishing techniques are invaluable for achieving superior aesthetics from composite resins in line with their growing popularity. A surface roughness of 0.7 pin to 1.44 Nm is enough to promote plaque accumulation whereas a well-finished and smooth surface will deter plaque and stain accumulation for a longer period of time. Ultimately, it is the characteristics of the filler and resin particles together with the right combination of finishing instruments which will determine the smoothness of composites on placement. This is a review article