- 作者：Aless ; ro D. Loguercio ; Rodrigo Stanislawczuk ; Friedrich G. Mittelstadt ; Marcia M. Meier ; Aless ; ra Reis
- 关键词：Adhesive ; Hybrid layer ; Diphenyliodonium salt ; Microtensile bond strength ; Nanoleakage ; Adhesive properties
- 刊名：Journal of Dentistry
- 出版年：2013
- 出版时间：July, 2013
- 年：2013
- 卷：41
- 期：7
- 页码：653-658
- 全文大小：471 K
Objectives
The aim of this study was to assess the microtensile bond strength (¦ÌTBS), nanoleakage (NL), nano-hardness (NH) and Young's modulus (YM) of resin-dentine bonding components formed by an experimental adhesive system with or without inclusion of diphenyliodonium salt (DPIH) in the camphorquinone-amine (CQ) system.Methods
On 12 human molars, a flat superficial dentine surface was exposed by wet abrasion. A model simplified adhesive system was formulated (40 wt. % UDMA/MDP, 30 wt. % HEMA and 30 wt. % ethanol). Two initiator systems were investigated: 0.5 mol % CQ + 1.0 mol % EDMAB and 0.5 mol % CQ + 1.0 mol % EDMAB + 0.2 mol % DPIH. Each adhesive was applied and light-cured (10 s; 600 mW/cm2). Composite build-ups were constructed incrementally and resin-dentine specimens (0.8 mm2) were prepared. For NL, 3 bonded sticks from each tooth were coated with nail varnish, placed in the silver nitrate, polished down with SiC papers and analysed by EDX-SEM. NH and YM were performed on the hybrid layer in 2 bonded sticks from each teeth. The remaining bonded sticks were tested on ¦ÌTBS (0.5 mm/min). The data from each test were submitted to a Student t-test (¦Á = 0.05).
Results
No significant difference was found for ¦ÌTBS between groups (p > 0.05). Significant lower NL and higher NH and YM were found in the hybrid layer and adhesive layer produced with the iodinium salt-containing adhesive (p < 0.05).
Conclusions
The inclusion of the DPIH to the traditional CQ is a good strategy to improve the adhesive and mechanical properties of a simplified etch-and-rinse adhesive system.