West China Journal of Stomatology ›› 2022, Vol. 40 ›› Issue (6): 668-675.doi: 10.7518/hxkq.2022.06.007

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Bonding properties of mild universal adhesives to dentin pretreated with hydroxyapatite-based desensitizing agents

Meng Yuchen1(), Huang Fan1, Wang Silin1, Huang Xin1, Lu Yi2, Pei Dandan1,2()   

  1. 1.Hospital of Stomatology, Xi’an Jiaotong University, Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Xi’an 710004, China
    2.Dept. of Prosthodontics, Hospital of Stomatology, Xi’an Jiaotong University, Xi’an 710004, China
  • Received:2022-05-16 Revised:2022-09-10 Online:2022-12-01 Published:2022-11-23
  • Contact: Pei Dandan E-mail:mengyuchen@stu.xjtu.edu.cn;peidandan1986@126.com
  • Supported by:
    The National Natural Science Foundation of China(81870798);Correspondence: Pei Dandan, E-mail: peidandan1986@126.com


Objective The purpose of the study was to evaluate the effect of hydroxyapatite (HA)-based desensiti-zing agents and determine their influence on the bonding performance of mild universal adhesives. Methods Mid-coronal dentin samples were sectioned from human third molars and prepared for a dentin-sensitive model. According to desensitizing applications, they were randomly divided into four groups for the following treatments: no desensitizing treatment (control), Biorepair toothpaste (HA-based desensitizing toothpaste) treatment, Dontodent toothpaste (HA-based desensitizing toothpaste) treatment, and HA paste treatment. Dentin tubular occlusion and occluded area ratios were evaluated by scanning electron microscopy (SEM). Furthermore, All-Bond Universal, Single Bond Universal, and Clearfil Universal Bond were applied to the desensitized dentin in self-etch mode. The wettability and surface free energy (SFE) of desensitized dentin were evaluated by contact angle measurements. Bonded specimens were sectioned into beams and tested for micro-tensile bond strength to analyze the effect of desensitizing treatment on the bond strength to dentin of universal adhesives. Results SEM revealed that the dentin tubule was occluded by HA-based desensitizing agents, and the area ratios for the occluded dentin tubules were in the following order: HA group>Biorepair group>Dontodent group (P<0.05). Contact angle analysis demonstrated that HA-based desensitizing agents had no statistically significant influence on the wettability of the universal adhesives (P>0.05). The SFE of dentin significantly increased after treatment by HA-based desensitizing agents (P<0.05). The micro-tensile bond strength test showed that HA-based desensitizing toothpastes always decreased the μTBS values (P<0.05), whereas the HA paste group presented similar bond strength to the control group (P>0.05), irrespective of universal adhesive types. Conclusion HA-based desensitizing agents can occlude the exposed dentinal tubules on sensitive dentin. When mild and ultra-mild universal adhesives were used for subsequent resin restoration, the bond strength was reduced by HA-based desensitizing toothpastes, whereas the pure HA paste had no adverse effect on bond strength.

Key words: dentin hypersensitivity, hydroxyapatite, universal adhesive, micro-tensile bond strength, self-etch mode

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