| Effect of Nd:YAG laser irradiation on adherence of retrograde filling materials: evaluation by micro-computed tomography |
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Minyoung Kim1, Hyeon-cheol Kim2, Sang Won Kwak3, Tai Cheol Yoon4, Euiseong Kim5 |
1Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University
2Department of Conservative Dentistry, School of Dentistry, Pusan National University
3Department of Conservative Dentistry, School of Dentistry, Pusan National University
4Department of Conservative Dentistry, National Health Insurance Service Ilsan Hospital
5Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University |
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| Abstract |
Background
/Purpose: The purpose of this study was to evaluate the effect of Nd:YAG irradiation on adherence of retrograde filling materials (mineral trioxide aggregate [MTA] and Super-EBA) by micro-computed tomography (CT) measurement and to observe the dentinal surface after irradiation by scanning electron microscopy (SEM). Materials and methods: Forty retrofilling models using extracted human teeth were divided into four groups according to the material and method used: ProRoot MTA (MTA group), Super-EBA (EBA group), MTA with Nd:YAG laser irradiation (LMTA group), and Super-EBA with Nd:YAG laser irradiation (LEBA group). All specimens were stored in 100% humidity for 24 hours until micro-CT was performed. The gap volume of the tooth/material interface was measured using the CTAn program. In six samples, the laser-irradiated dentin surface was observed using SEM. Results: The mean percent difference in gap volume was not statistically significant between the Nd:YAG laser-irradiated groups and non-irradiated in both materials(P > 0.05). The gap volume in the MTA group was significantly lower than that in the EBA group (P < 0.05). Examination of the non-irradiated specimens by SEM showed patent dentinal tubules. In contrast, alterations in the texture of the dentin surface and obliteration of the dentinal tubules were evident in the Nd:YAG laser-irradiated specimens. Conclusion: In this study, changes in the dentinal surface after Nd:YAG irradiation did not affect adherence between the apical filling material and the dentin wall. |
| Key Words:
apical seal;dentinal surface;laser device;microleakage;surgical endodontics;retrofill; |
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