1. Microtensile Bond Strength of 4 Dentin Adhesives to Primary Dentin.
- Author
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Miranda, Carla, Prates, Luiz Henrique Maykot, Chain, Marcelo Carvalho, and de Sousa Vieira, Ricardo
- Subjects
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ADHESIVES , *AGING , *ANALYSIS of variance , *BIOMECHANICS , *BIOPHYSICS , *COMPARATIVE studies , *DECIDUOUS teeth , *DENTAL bonding , *DENTAL resins , *DENTIN , *DENTITION , *ELECTRON microscopy , *RESEARCH methodology , *MOLARS , *STATISTICS , *TIME , *SAMPLE size (Statistics) , *TREATMENT effectiveness , *REPEATED measures design - Abstract
Purpose: This study's purpose was to evaluate the aging effect on the bond strength of 4 adhesive systems on primary dentin 24 hours and 6 months after bonding. Methods: The crowns of extracted, caries-free primary molars were grounded and flat surfaces were prepared and distributed into 4 groups (n=7-9). The adhesives Scotch-bond Multi-purpose (SMP), Single Bond (SB), Clearfil SE Bond (CSB), and Adper Prompt L-Pop (APL) were applied with the composite resin Filtek Z-250. Specimens were stored in distilled water (37°C/24h), the crowns were sectioned, and 0.8-mm² resin-dentin sticks were obtained and divided into 2 groups: (1) 24h; and (2) 6m. Each group's specimens were tested under tensile at 0.5 mm/minute until they fractured. The fractured sticks were examined by scanning electron microscopy. The data were analyzed by 2-way repeated measures: analysis of variance; Tukey's test (P<.05); and Kruskal-Wallis test (P<.05). Results: The mTBS (MPa) means values were: SMP=33.28 (2.05), SB=23.27 (4.78), APL=20.64 (10.66), and CSB=18.94 (11.94) for the 24-hour group; and SMP=30.59 (6.29), SB=22.39 (5.9), CSB=21.50 (10.67), and APL=17.19 (6.88) for the 6-month group. The most frequent fracture type found was cohesive failure of the adhesive and mixed, with no statistically significant difference found between the groups. Conclusions: Resin bond strength on primary dentin was not influenced by aging for the adhesive systems tested. [ABSTRACT FROM AUTHOR]
- Published
- 2010