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Effects of Er:YAG laser irradiation on human dentin: polarizing microscopic, light microscopic and microradiographic
Yaeko Ishizaka1, Toru Eguro, Toru Maeda
1Department of Endodontics and Operative Dentistry, School of Dentistry at Tokyo, Nippon Dental University, Tokyo, Japan. yaeko-n@tokyo.ndu.ac.jp
Background And Objectives:
The effects of Er:YAG laser irradiation on dentin have not been sufficiently investigated. The purpose of this study was to investigate the effects of Er:YAG laser irradiation on dentin.
Study Design/Materials And Methods:
After cavities were prepared using Er:YAG laser irradiation or rotary cutting instruments, histological observations of cavity-floor dentin utilizing polarizing microscopy, microradiography and light microscopy, and analysis of composition of cavity-floor dentin using Fourier-transformed (FT-IR) spectrometry were conducted.
Results:
In the laser-treated side, a deeply stained basophilic layer was observed. The number of odontoblastic processes present was obviously less in the laser-treated side than in the bur-treated side. FT-IR analysis revealed that compared to the bur-treated side, a broad background peak at around 1,600 cm(-1) was present.
Conclusions:
Er:YAG laser irradiation might have denatured the organic materials of dentin.