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Type: Artigo de periódico
Title: Influence of Different Enamel Substrates on Microtensile Bond Strength of Sealants After Cariogenic Challenge
Author: Kantovitz, KR
Pascon, FM
Alves, MC
Nociti, FH
Tabchoury, CPM
Puppin-Rontani, RM
Abstract: 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.
Subject: preventive therapy
microtensile bond strength
fissure sealing
caries-like lesion
cariogenic challenge model
Country: EUA
Editor: Quintessence Publishing Co Inc
Citation: Journal Of Adhesive Dentistry. Quintessence Publishing Co Inc, v. 13, n. 2, n. 131, n. 137, 2011.
Rights: aberto
Identifier DOI: 10.3290/j.jad.a19230
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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