Effect of a desensitizing polishing paste on bonding strength of two self-etching adhesives to dentin
10.3760/cma.j.issn.1002-0098.2013.03.010
- VernacularTitle:脱敏抛光膏对两种自酸蚀粘接剂粘接强度的影响
- Author:
Si-Ying LIU
1
;
Ya-Ke WANG
;
Dan-Dan PEI
;
Cui HUANG
;
Tian LIU
Author Information
1. 430079,武汉大学口腔医学院口腔基础医学省部共建国家重点实验室培育基地和口腔生物医学教育部重点实验室
- Keywords:
Dentin sensitivity;
Dentin desensitizing agents;
Dentin-bonding agents;
Tensile strength
- From:
Chinese Journal of Stomatology
2013;48(3):165-169
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effect of an 8％ arginine-CaCO3 containing desensitizing polishing paste on bonding strength of two self-etching adhesives to dentin.Methods Thirty-six intact human premolars extracted for orthodontic reasons were collected within 1 month after extraction and randomly assigned into three groups using a table of random numbers (n =12): specimens without any treatment served as control.In the polishing powder group specimens were polished with a slurry of pumice,and in the desensitizing polishing paste group dentin surfaces of the sample teeth were treated with 8％ arginine-CaCO3 containing desensitizing polishing paste.Then each group was divided into two sub-groups using a table of random numbers in order to evaluate the bonding strength of two self-etching adhesive agents (G-Bond,GC; Fl-Bond Ⅱ,Shofu).Microtensile bond strength test was conducted immediately and after 5000 thermocycling (n =15).Scanning electron microscope (SEM) was used to evaluate the occluding effect of the desensitizing polishing paste.Results In the prethermocycling stage,there were no significant differences in Fl-Bond Ⅱ bonding strength among the three groups [control: (30.34 ± 5.42) MPa,polishing powder group: (29.72 ± 5.16) MPa,desensitizing polishing paste group: (31.53 ± 4.86) MPa] (P ＞ 0.05).However there were significant differences among the three groups in G-Bond bonding strength [control: (38.19 ±4.42) MPa,polishing powder group: (36.47 ± 4.72) MPa,desensitizing polishing paste group: (46.88 ±7.83) MPa] (P ＜0.05).After thermocycling precess,there were no significant differences in bonding strenght among the three groups in both G-Bond groups and Fl-Bond Ⅱ groups.SEM observation showed that the desensitizing polishing paste could occlude open dentinal tubules effectively,and the application of self-etching adhesives could re-open the dentinal tubular orifices.An even layer can be seen on the dentin surface treated with self-etching adhesive containing functional monomers.Conclusions The 8％ arginine-CaCO3 containing desensitizing polishing paste could effectively occlude dentinal tubules,thus may have potential benefits in preventing post-operative sensitivity.Additionally,it had no adverse effect on bonding strength of self-etching adhesives to dentin.
