A study on the microgap of three resin cements
10.3760/cma.j.issn.1002-0098.2013.s1.023
- VernacularTitle:不同树脂粘接剂粘接界面微裂隙的观测与评价
- Author:
Min HE
1
;
Zu-Tai ZHANG
;
Ning DING
;
Li-Hua GE
;
Yan LIU
Author Information
1. 100050,首都医科大学口腔医学院 北京口腔医学研究所
- Keywords:
Microscopy,electron,scanning;
Dentin-bonding agents;
Microgap
- From:
Chinese Journal of Stomatology
2013;48(z1):102-106
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the interface microgap between resin adhesive and teeth.Methods Single-sided cavities were prepared on buccal surface of 15 freshly extracted molars.Then the molars were randomly divided into 3 groups.In each group,the cavities were restored with 3M Z250,and bonded with one of the three types of adhesives:total etch adhesive 3M ESPE Adper Single Bond 2 (A group),two-component self-etching adhesive 3M ESPE Adper SE Plus(B group),and one-component self-etching adhesive iBond Self Etch(C group).The interface microgap at side wall and bottom of the cavities on the prosthesis middle section were observed and measured using Phenom proX scanning electron microscopy (SEM).After all the samples were subjected to thermal cycling (3000 times,5-55 ℃),measurement procedures were conducted again.Results After thermal cycling,the microgap became significantly larger in each group (P ＜ 0.05).There was no statistical difference among the increase of specific width in A group,B group and C group [sidewall:1.33 (1.14,1.74),1.27 (1.04,1.86),1.11 (0.55,1.46) μm;bottom wail:2.22 (1.36,2.50),1.91 (1.48,2.88),2.38 (2.08,2.47) μm] (P ＞ 0.05).Conclusions Different bonding agents have no different teeth bonding properties.Thermal cycling has negative effect on the stability of adhesive interface.
