ORIGINAL ARTICLE

 

Marginal microleakage of class II composite resin restorations due to restorative techniques

 

Microinfiltração marginal de restaurações classe II de resina composta devido às técnicas restauradoras

 

 

Andreia A. Carvalho^I; Francine C. L. Moreira^II; Larissa M. Cunha^III; Samara M. de Moura^III; João Batista de Souza^IV; Carlos Estrela^V; Lawrence G. Lopes^V

^IPost-graduate Program, School of Dentistry, Federal University of Goiás, Goiânia, GO, Brazil
^IIDepartment of Prevention and Oral Rehabilitation, School of Dentistry, Federal University of Goiás, Goiânia, GO, Brazil
^IIISchool of Dentistry, Federal University of Goiás, Goiânia, GO, Brazil
^IVDepartment of Prevention and Oral Rehabilitation, School of Dentistry, Federal University of Goiás, Goiânia, GO, Brazil
^VDepartment of Prevention and Oral Rehabilitation, School of Dentistry, Federal University of Goiás, Goiânia, GO, Brazil

Correspondence

 

 

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ABSTRACT

PURPOSE: To evaluate the marginal microleakage of class II composite resin (CR) restorations due to restorative techniques.
METHODS: Forty human extracted premolars were assigned to 4 groups (n=10). Class II cavities were prepared (4-mm wide, 2-mm axially, with the gingival margin located 1 mm beyond the cementum-enamel-junction), and the restorative adhesive system Prime & Bond 2.1/TPH³ (Dentsply) was used. CR was inserted by the oblique incremental technique (OIT) and cured in continuous exposure. The restoratives techniques were: group 1 (control): OIT; group 2: flowable resin (1 mm) applied in the gingival wall + OIT; group 3: OIT + three pre-cured spheres inserted in the first increment of CR; and, group 4: OIT + strip of fiberglass inserted in the first increment of CR. The specimens were subjected to a thermocycling regimen of 500 cycles (1 min at 5º-37º-55ºC), coated with two layers of nail varnish up to 1 mm from the restoration margins, and immersed in 0.5% basic fuchsine solution for 24 h. The extension of dye penetration at the cervical wall (µm) was evaluated using an optic microscope at x40. Data were analyzed using analysis of variance (ANOVA) (α=0.05).
RESULTS: The microleakage values were: G1: 370 µm ± 241; G2: 398 µm ± 354; G3: 205 µm ± 119; and G4: 413 µm ± 340. No statistically significant differences were found among the restorative techniques (P=0.081).
CONCLUSION: Marginal microleakage values were not influenced by the different restorative techniques tested.

Key words: Composite resin; marginal microleakage; restorative technique

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RESUMO

OBJETIVO: Avaliar a microinfiltração marginal de restaurações classe II de resina composta (RC) em função de técnicas restauradoras.
METODOLOGIA: Quarenta pré-molares humanos extraídos foram divididos em 4 grupos (n=10). Cavidades classe II foram preparadas (4 mm de largura, 2 mm de altura e margem gengival localizada a 1 mm além da junção amelo-cementária, e foi usado o sistema adesivo Prime & Bond 2.1/TPH³ (Dentsply). A RC foi inserida pela técnica incremental oblíqua (OIT) e polimerizada em exposição contínua. As técnicas restauradoras foram: grupo 1 (controle): OIT; grupo 2: resina fluida (1 mm) aplicada na parede gengival + OIT; grupo 3: OIT + três esferas pré-polimerizadas no primeiro incremento de RC; e grupo 4: OIT + tira de fibra de vidro inserida no primeiro incremento de RC. Os espécimes foram submetidos à termociclagem por 500 ciclos (1 min a 5º-37º-55ºC), cobertos com duas camadas de esmalte até 1 mm das margens da restauração e imersos em solução de fucsina básica a 0,5% por 24 h. A extensão da penetração do corante na parede cervical (µm) foi avaliada com microscópio ótico (x40). Os dados foram analisados por ANOVA (α=0,05).
RESULTADOS: Os valores de microinfiltração foram: G1: 370 µm ± 241; G2: 398 µm ± 354; G3: 205 µm ± 119 e G4: 413 µm ± 340. Não houve diferença estatisticamente significativa entre as técnicas restauradoras (P=0,081).
CONCLUSÃO: Os valores de microinfiltração marginal não foram influenciados pelas diferentes técnicas restauradoras neste estudo.

Palavras-chave: Resina composta; microinfiltração marginal; técnica restauradora

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Full text available only in PDF format.

 

 

Acknowledgments

The authors would like to acknowledge Núbia Miranda Ferreira (Dentsply) for supplying the material.

 

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Correspondence:
Lawrence Gonzaga Lopes
Department of Prevention and Oral Rehabilitation
School of Dentistry
Federal University of Goias
Praça Universitária esq. c/ 1^IAvenida s/n - Setor Universitário
Goiânia, GO - Brazil 74605-220
E-mail: drlawrenceg@yahoo.com.br

Received: December 30, 2009
Accepted: March 31, 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. The materials were donated by Dentsply.