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J Korean Acad Pediatr Dent. 2007;34(2): 222-233.
Quantitative Micro-CT Evaluation of Microleakage in Composite Resin Restorations
Sang-Ik Lee, Hong-Keun Hyun, Young-Jae Kim, Jung-Wook Kim, Sang-Hoon Lee, Chong-Chul Kim, Se-Hyun Hahn, Ki-Taeg Jang
서울대학교 치과대학 소아치과학교실 및 치학연구소
Corresponding Author: Ki-Taeg Jang ,
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ABSTRACT
One of the most important and basic test of dental restorative materials is the evaluation of microleakage into the tooth-restorative interface. There are many techniques to test microleakage, but most of them have several disadvantages. Recently developed microtomography(micro-CT) can provide the three dimensional image and information about the internal component in non-destructive way, therefore using micro-CT, it is possible to evaluate microleakage exactly in quantitative manner. The purpose of this study is to find a new method for quantitative and non-destructive evaluation of microleakage in composite resin restorations using micro-CT and to compare the new method with conventional dye penetration method. Thus, microleakages of two kinds of dentin bonding systems were evaluated with above two methods. 40 extracted sound human premolars were randomly divided into two groups consisting of 20 samples and restored accordingly. Group 1 : Class V resin restorations with AdperTM Singe Bond Group, 2 : Class V resin restorations with AdperTMPrompTM L-pop. The FiltekTM Supreme was applied to the Class V cavities of all teeth. After that, 10 teeth from each group were applied to evaluation of microleakage using micro-CT, and other 10 teeth from each group were using conventional dye penetration method. The conclusions of this study were as follow : 1 Using micro-CT, Group 1 showed significantly less microleakage than Group 2 and there was statistically significant difference(p<0.01) between two groups. 2. Using conventional dye penetration method, Group 1 leaked less than Group 2 and there was statistically significant difference(p<0.01) between two groups 3. The difference between two groups is more evident in the method using micro-CT. 4. In all two methods, microleakage appeared more into the cavities to dentinal margins than enamel margins.
Keywords: Microleakage | Micro-CT | Dye penetration; 3D image
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