[The microscopic characteristic of the dentinal tubule obstructed by desensitizer and the effect of desensitizer on the shear strength of resin cements].
OBJECTIVE
To observe the microscopic characteristic of the dentinal surface and cross section after using dental desensitizer, and evaluate the effect of the dental desensitizer on the shear strength of resin cements.


METHODS
To use the dental desensitizer (Gluma, Single Bond 2, BisBlock) individually on the prepared human bicuspid teeth which were extracted for orthopaedics. The microscopic characteristic of the dentinal surface and cross section were observed with scanning electron microscope (SEM). The adhered posts to the teeth pretreated with desensitizer were bonded with resin cements. The shear strength was measured and data was analyzed by SPSS 13.0 statistics software.


RESULTS
The orifices of dentinal tubule were mostly occluded in Gluma samples and partly occluded in BisBlock samples. Resin layer was observed in Single Bond 2 samples. BisBlock group gathered the best shear strength, the shear strength value was (13.04+/-2.76) MPa. Marked statistic difference were found when compared with control group.


CONCLUSIONS
Gluma, Single Bond 2 and BisBlock can block the orifices of dentinal tubule. BisBlock enhanced the bonding strength of the resin cements.
Wang
Xue
X
Department of Prosthetics, The Affiliated Hospital of Medical College, Qingdao University, Qingdao 266003, China.
Li
Jin-Hua
JH
Mu
Jian-Gang
JG
Liu
Hong
H
D017438:Bisphenol A-Glycidyl Methacrylate; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin; D017220:Dentin-Bonding Agents; D005976:Glutaral; D006801:Humans; D011109:Polymethacrylic Acids; D019279:Resin Cements; D033081:Shear Strength
D017220:Dentin-Bonding Agents; D011109:Polymethacrylic Acids; D019279:Resin Cements; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate; C044372:Gluma; D005976:Glutaral