Effect of a nano hydroxyapatite desensitizing paste application on dentin bond strength of three self-etch adhesive systems
10.3760/cma.j.issn.1002-0098.2017.05.004
- VernacularTitle: 纳米羟基磷灰石糊剂脱敏处理对三种自酸蚀粘接剂粘接强度的影响
- Author:
Dandan PEI
1
;
Siying LIU
2
;
Hongye YANG
3
;
Jing GAN
4
;
Cui HUANG
3
Author Information
1. Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710004, China
2. Department of Oral and Maxillofacial Surgery, School of Stomatology, Wuhan University, Wuhan 430079, China
3. Department of Prosthodontics, School of Stomatology, Wuhan University, Wuhan 430079, China
4. Department of Prosthodontics, College of Stomatology, Xi'an Jiaotong University, Xi'an 710004, China
- Publication Type:Journal Article
- Keywords:
Dentin sensitivity;
Hydroxyapatites;
Dentin-bonding agents
- From:
Chinese Journal of Stomatology
2017;52(5):278-282
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate a nano-hydroxyapatite (nano-HA) desensitizing paste application on the bond strength of three self-etch adhesives.
Methods:Three dentin specimens of about 1 mm thick were cut from two teeth. Scanning electron microscope (SEM) was used to evaluate the dentin surfaces without treatment, after citric acid treatment and after nano-HA treatment. Thirty-six intact third molars extracted for surgical reasons were cut to remove the occlusal enamel with isomet, and then were etched with 1% citric acid for 20 s to simulate the sensitive dentin and divided into two groups randomly using a table of random numbers (n=18): the control group (no treatment) and the HA treated group (with nano-HA paste treatment). Each group was divided into three subgroups randomly using a table of random numbers (n=6). Subgroup A, B and C was bonded with G-Bond, Clearfil S3 Bond and FL-Bond Ⅱ according to the manufacture's instruction separately. At 24 h after bonding procedure, and after water storage for 6 months, microtensile bond strength of the specimens was tested and the failure mode was analyzed.
Results:SEM obeservation showed that citric acid could open the dentin tubules to set up the sensitive dentin model, and the nano-HA could occlude the dentin tubules effectively. For subgroup A, bonding strength of specimens treated with nano-HA ([41.14±8.91] MPa) was significantly high than that of the control group ([34.27±6.16] MPa) at 24 h after bonding procedure (P<0.05). However, after 6 month water ageing, the bonding strength of the control group and the HA treated group showed no significant difference (P>0.05). For subgroup B, specimens with nano-HA application showed lower bonding strength ([30.87±6.41] MPa) than that of the control group ([36.73±5.82] MPa) at 24 h after bonding procedure (P<0.05), and after 6 month water ageing, the bond strength of nano-HA application ([25.73±6.99] MPa) was also lower than that of the control group ([32.33±5.08] MPa) (P<0.05). For subgroup C, the bond strength of the control group and the HA treated group have no significant difference either before or after 6 month water ageing (P>0.05). Failure mode analysis showed that more than half of the samples in all groups were adhesive failure.
Conclusions:Nano-HA treatment decreased the bond strength of subgroup B, while had no adverse effect on subgroup A and subgroup C.
