The Journal of the Korean dental association (대한치과의사협회지)

The Korean Dental Association (대한치과의사협회)
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Effect of two dentin desensitizers and Er,Cr:YSGG laser for dentinal tubule occlusion

상아세관 폐쇄에 대한 2종의 상아질 지각 과민 체치제와 Er,Cr:YSGG 레이저의 효과

  • Kim, Na-Song (Department of esthetic restorative dentistry, Graduate School of Clinical Dentistry at Korea University) ;
  • Kang, Jeong-Kyung (Department of esthetic restorative dentistry, Graduate School of Clinical Dentistry at Korea University) ;
  • Ryu, Jae-Jun (Department of esthetic restorative dentistry, Graduate School of Clinical Dentistry at Korea University)
  • 김나송 (고려대학교 임상치의학대학원 심미수복학과) ;
  • 강정경 (고려대학교 임상치의학대학원 심미수복학과) ;
  • 류재준 (고려대학교 임상치의학대학원 심미수복학과)
  • Published : 2010.06.01
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Abstract

The purpose of this study was to evaluate the effect of two dentin desensitizers and Er,Cr:YSGG laser for dentinal tubule occlusion. Twenty recently extracted single-rooted human teeth were used to obtain root dentinal fragments. The crowns were cut approximately 1mm below the cementum enamel junction(CEJ). A second cut was used to remove the apex of the root. Subsequently, a longitudinal cut was made in order to obtain 2 fragments from each root sample. The cementum from the cervical portion was removed using a high-speed diamond-coated bur in order to expose the dentin. To open dentinal tubules, forty samples were treated with 50% citric acid for 2 min and then rinsed under distilled water for 1 min. These were divided into four groups of ten samples each. The first group served as a control group. In group 2, the samples were irradiated with the Er,Cr:YSGG laser(Waterlase MD, Biolase, USA). In group 3, the samples were treated with Bisblock and ONE-STEP PLUS(Bisco, USA). In group 4, the samples were treated with Gluma comfort bond & Desensitizer(Heraeus Kulzer, Germany). All the samples were examined using Scanning electron microscopy(Hitachi, S-4700, Japan) with two different magnifications(X2000, X5000). These images were assessed by one examiner who was blind to the experimental procedure, using the index of smear layer removal. The distribution of smear layer removal grades was tested using Fisher's exact test. On the order hand, in order to evaluate the occluding effect of two dentin desensitizers and Er,Cr:YSGG laser, the number of exposed dentinal tubules was counted in each group. These were evaluated using the Kruskal-Wallis test with significance predetermined $\alpha$=0.05. There were statistically significant differences between the three groups(Er,Cr:YSGG laser, Bisblock+ONE-STEP PLUS, Gluma comfort bond & Desensitizer) and control group.

Keywords

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