Repair of amalgam restorations with conventional and bonded amalgam: an in vitro study

Abstract

Purpose: This study evaluated microleakage on amalgam restorations repaired by amalgam and bonded amalgam.Methods: Thirty extracted human pre-molars were restored by amalgam. A simulated defect was prepared and assigned to two treatment groups (n=15): G1 -repaired by amalgam (Permite C-SDI); G2 -repaired by bonded amalgam (Caulk 34% Tooth Conditioner Gel -Dentsply + Prime & Bond 2.1 -Dentsply + Permite C-SDI). The teeth were immersed in a 50% silver nitrate solution, thermocycled and then, sectioned longitudinally through the restoration center and examined by 3 examiners using a stereomicroscope. Microleakage was evaluated in a 0-4 scale for dye penetration. Microleakage data were analyzed by Kruskal Wallis and Dunn test.Results: The bonded amalgam technique was significantly the most effective in repair/tooth interfaces sealing (score 0=53.3%, P=0.0012). For repair/restoration interfaces, conventional amalgam was also statistically more effective in the sealing (score 0=86.7%, P<0.001).Conclusion: None of materials eliminated microleakage completely. The use of adhesive systems had significant effect on the ability to seal the repair/tooth interface, however, for repair/restoration interface, it can increase microleakage.

Coronal microleakage with five different temporary restorative materials following walking bleach technique: An ex-vivo study

“…After the final setting of the restorative materials, all the teeth were immersed in 1% India ink dye (AB Chemi, Glasco, UK) and in the dye solution the teeth were subjected to thermocycling at 4° ± 2°C and 56° ± 2°C for 500, 2 min cycles with a dwell time of 60 s for 7 days. [2]…”

Repair of Dimethacrylate-Based Composite Restorations by a Silorane-Based Composite: A One-Year Randomized Clinical Trial

“…14,[16][17][18][19][20][21] This approach allows preservation of sound tooth structure. 22,23 Clinical studies involving composite resin repairs have shown that when properly planned, the repairs may increase the clinical longevity of restorations, representing a conservative choice for treatment of restorations. 13,14,24 Thus, once in vitro studies suggest that bonding of silorane-based composites to old dimethacrylatebased composites may be a viable clinical procedure, [25][26][27] it would be desirable to evaluate the clinical performance of this new system for making repairs.…”

Examining the Effect of Laser Radiation on the Repair of Dental Composite Restorations: A Systematic Review

“…concept of minimally invasive restorative dentistry, total replacement should be avoided, except in cases where a fracture in the composite, discoloration of the resin contact surface with the tooth, and secondary caries are observed (7). This method helps to preserve healthy dental tissues (8).…”

“…Brosh et al indicated that devising a single bond between the old and the new composite during the repair process is attainable through three respective mechanisms, namely (a) chemical bond to the organic matrix, (b) chemical bond to the exposed fillers, and (c) micromechanical trap (8). Preceding studies have determined the efficacy of micromechanical traps created by diamond milling, sandblasting, or acid etching in the bond strength of repaired composites (14).…”