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Microstructural changes of enamel, dentin–enamel junction, and dentin induced by irradiating outer enamel surfaces with CO2 laser

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Abstract

The microstructural changes of enamel, dentin–enamel junction (DEJ), and dentin after CO2 laser irradiation were studied. Buccal enamel surfaces of human third molars about 2 mm from the DEJ were irradiated, and the laser tip was moved 5 mm in a mesiodistal direction with 5 s of irradiation time. The output powers were 2 to 10 W in a continuous mode, and the average doses were approximately from 250 to 1,250 J/cm2. All specimens were examined by a scanning electron microscope, and heat-transfer simulation was also applied to calculate temperature distribution. Surface ablation of enamel and separation of enamel and dentin along the DEJ were observed when the laser power output exceeded 3 W. Heat-transfer simulation indicated that dentin was prone to store more thermal energy than enamel. In conclusion, operation parameters of the CO2 laser should be carefully selected to avoid thermal damage to the DEJ.

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Authors and Affiliations

  1. School of Dentistry and Graduate Institute of Clinical Dentistry, College of Medicine, National Taiwan University and National Taiwan University Hospital, Taipei, Taiwan, Republic of China

    Yu-Chih Chiang, Bor-Shiunn Lee, Yin-Lin Wang, Ya-An Cheng, Yen-Ling Chen & Chun-Pin Lin

  2. Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China

    Jia-Shyan Shiau & Da-Ming Wang

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  1. Yu-Chih Chiang
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  2. Bor-Shiunn Lee
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Correspondence to Chun-Pin Lin.

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Chiang, YC., Lee, BS., Wang, YL. et al. Microstructural changes of enamel, dentin–enamel junction, and dentin induced by irradiating outer enamel surfaces with CO2 laser. Lasers Med Sci 23, 41–48 (2008). https://doi.org/10.1007/s10103-007-0453-y

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  • DOI: https://doi.org/10.1007/s10103-007-0453-y

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