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Effect of Nd:YAG laser irradiation on adherence of retrograde filling materials: evaluation by micro-computed tomography

 Minyoung Kim  ;  Hyeon-cheol Kim  ;  Sang Won Kwak  ;  Tai Cheol Yoon  ;  Euiseong Kim 
 Journal of the Korean Dental Association (대한치과의사협회지), Vol.54(11) : 865-873, 2016 
Journal Title
Journal of the Korean Dental Association(대한치과의사협회지)
Issue Date
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.
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2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Eui Seong(김의성) ORCID logo https://orcid.org/0000-0003-2126-4761
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