Influence of Cavity Preparation with Er,Cr:YSGG Laser and Restorative Materials on In Situ Secondary Caries Development

Autor(es)

Tedesco Jorge, Ana Carolina ^[1] ; Cassoni, Alessandra ^[1] ; de Freitas, Patricia Moreira ^[2] ; Reis, Andre Figueiredo ^[1] ; Brugnera Junior, Aldo ^[3] ; Rodrigues, Jose Augusto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Guarulhos, Dept Restorat Dent, Dent Res & Grad Studies Div, Guarulhos, SP - Brazil

^[2] Univ Sao Paulo, Sch Dent, Dept Restorat Dent, Special Lab Lasers Dent, BR-05508 Sao Paulo - Brazil

^[3] Univ Camilo Castelo Branco, Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Photomedicine and Laser Surgery; v. 33, n. 2, p. 98-103, FEB 1 2015.
• Citações Web of Science: 6

Resumo

Objective: The aim of this study was to evaluate the influence of cavity preparation and restorative materials containing fluorides in the prevention of secondary caries lesion development in situ. Methods: A total of 120 blocks obtained from human teeth were divided into two groups and standardized cavities were prepared using diamond burs (DB) or Er,Cr:YSGG-laser {[}20 Hz, 4.0W, 55% water, 65% air (LA)]. They were divided into three subgroups according to the restorative material (n=20): glass-ionomer cement (GI), resin modified glass-ionomer (RM) or composite resin (CR). Blocks were fixed in palatal intra-oral appliances worn in situ by 20 human volunteers, who dropped 20% sucrose solution eight times daily. After 21 days, blocks were removed and restorations were cross-sectioned to evaluate microhardness {[}Knoop hardness number (KHN)] underneath enamel surface from 30 to 200 mu m. Factors ``cavity preparation,{''} ``restorative materials,{''} and ``depth{''} were evaluated by three way ANOVA, followed by Tukey test (p<0.05). Results: The results showed lower microhardness in cavities prepared with DB than in cavities prepared with LA. At 30 mu m, there were no statistical significant differences with regard to ``cavity preparation{''} or ``restorative materials{''} factors. In depth evaluation, the enamel microhardness progressively increased as a function of depth for the GI groups. In the groups prepared with LA at 60 mu m/90 mu m, there were no significant differences between GI and RM materials, whose microhardnesses were significantly higher than that of CR. Conclusions: Cavity preparation using Er,Cr:YSGG laser increases caries resistance of enamel walls, and reduce caries lesion depth development regardless of fluoride presence in the restorative material. CR showed higher caries lesion development than GI, and RM showed intermediate results. (AU)

• Processo FAPESP: 08/08974-6 - A influência da técnica do preparo cavitário e dos tipos de materiais restauradores na prevenção de cárie secundária - estudo in situ.
• Beneficiário: Ana Carolina Tedesco Jorge
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 98/14270-8 - Centro de Ciências Ópticas e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs