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

Daniela Araújo Veloso Popoff, Fabiana Santos Gonçalves, Raquel Conceição Ferreira, Cláudia Silami Magalhães, Allyson Nogueira Moreira, Ivar A Mjör


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.


Dental leakage; dental amalgam; dental restoration failure

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e-ISSN: 1980-6523

ISSN-L: 0102-9460


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