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

Reparo de restaurações de amálgama com amálgama adesivo e convencional: estudo in vitro

Daniela Araújo Veloso Popoff^I; Fabiana Santos Gonçalves^I; Raquel Conceição Ferreira^II; Cláudia Silami Magalhães^III; Allyson Nogueira Moreira^III; Ivar A Mjör^IV

^IDoctorate Program, School of Dentistry, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
^IIDepartment of Dentistry, State University of Montes Claros, Brazil ]]> ^IIIDepartment of Restorative Dentistry, School of Dentistry, Federal University of Minas Gerais, Brazil
^IVDepartment of Operative Dentistry, Health Science Center, College of Dentistry, University of Florida, USA

Correspondence

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.

RESUMO

OBJETIVO: Avaliar a microinfiltração em restaurações de amálgama com reparo em amálgama ou amálgama adesivo.
MÉTODOS: Trinta pré-molares humanos extraídos foram restaurados com amálgama. Simulou-se um defeito nas restaurações reparado com: G1 - amálgama (n=15) (Permite C-SDI); G2 - amálgama adesivo (n=15) (Caulk 34% Condicionador dentário Gel - Dentsply + Prime & Bond 2.1 - Dentsply + Permite C-SDI). Os dentes foram imersos em solução de nitrato de prata a 50%, termociclados e então, secionados longitudinalmente através da restauração e examinados por três examinadores usando um estereomicroscópio. A microinfiltração foi avaliada pela penetração de corante com uma escala de 0 a 4. Diferenças entre os grupos foram verificadas pelos testes Kruskal Wallis e Dunn.
RESULTADOS: Na interface reparo/dente, a técnica de reparo com amálgama adesivo foi significativamente mais efetiva, apresentando menor microinfiltração (escore 0=53.3%, P= 0,0012). Já na interface reparo/restauração, houve menor microinfiltração nas restaurações reparadas com amálgama convencional (escore 0=86.7%, P<0,001).
CONCLUSÃO: Nenhum dos materiais eliminou a microinfiltração completamente. O uso de sistemas adesivos tem efeito significativo no selamento da interface reparo/dente, entretanto para interface reparo/restauração, ele pode aumentar a microinfiltração.

Palavras-chave: Infiltração dentária; amálgama dentário; falha de restauração dentária

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Correspondence:
Raquel Conceição Ferreira
Universidade Estadual de Montes Claros/CCBS/Departamento de Odontologia
Av. Rui Braga S/N - Vila Mauricéia
Montes Claros, MG - Brasil 39400-000 ]]> E-mail: ferreira_rc@hotmail.com

Received: September 28, 2009
Accepted: February 21, 2010

Conflict of Interest Statement: The authors state that there are no financial and personal conflicts of interest that could have inappropriately influenced their work.