Influence of Different Enamel Substrates on Microtensile Bond Strength of Sealants After Cariogenic Challenge

Autor(es)

Kantovitz, Kamila Rosamilia ; Pascon, Fernanda Miori ; Alves, Marcelo Correa ^[1] ; Nociti, Jr., Francisco Humberto ^[2] ; Machado Tabchoury, Cinthia P. ^[3] ; Puppin-Rontani, Regina Maria ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Anat, BR-13414900 Piracicaba, SP - Brazil

^[2] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Prosthodont & Periodont, BR-13414900 Piracicaba, SP - Brazil

^[3] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Physiol Sci, BR-13414900 Piracicaba, SP - Brazil

^[4] Univ Estadual Campinas, Pediat Dent Div, Dept Pediat Dent, Piracicaba Dent Sch, UNICAMP, BR-13414900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Adhesive Dentistry; v. 13, n. 2, p. 131-137, APR 2011.
• Citações Web of Science: 5

Resumo

Purpose: To evaluate the microtensile bond strength (mu TBS) of resin sealer on enamel substrates after cariogenic challenge. Materials and Methods: Enamel blocks were obtained from human third molars and randomly divided into 6 groups (n = 10) according to enamel substrates (S: sound, CL: caries-like lesion, or CLTF: caries-like lesion + topical fluoride application) and sealant material (F: FluroShield, or H: Helioseal Clear Chroma). Sealants were placed on enamel surfaces, stored in 100% humidity (24 h, 37 degrees C), and longitudinally sectioned into hourglass shapes. According to the groups, pH cycling was applied and the mu TBS test was performed. The fracture patterns were assessed by SEM. Results: Regarding substrates, the highest mu TBS values in MPa were observed for CLTF enamel (26.0 +/- 7.6), followed by S (22.0 +/- 7.4) and CL (15,5 +/- 4.9). A significant interaction was found between material and pH cycling (p = 0.0395). F (23.9 +/- 7.6) showed higher mu TBS values than H (18.3 +/- 7.5) when submitted to pH cycling. The majority of samples presented mixed failure. Conclusions: Enamel substrate significantly affected mu TBS, with the highest values for remineralized caries-like enamel lesions. Furthermore, mu TBS values were dependent on both materials and pH cycling. (AU)

• Processo FAPESP: 05/60595-1 - Desempenho do selamento de lesões de cárie artificial em esmalte frente ao desafio cariogênico: estudos in vitro e in situ, análise mecânica, micro-morfológica e bioquímica
• Beneficiário: Kamila Rosamilia Kantovitz
• Modalidade de apoio: Bolsas no Brasil - Doutorado