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Assessment of tooth wear based on autofluorescence properties measured using the QLF technology in vitro

 Hyung-Suk Lee  ;  Young-Dong Lee  ;  Sang-Kyeom Kim  ;  Jong-Hoon Choi  ;  Baek-Il Kim 
 Photodiagnosis and Photodynamic Therapy, Vol.25 : 265-270, 2019 
Journal Title
 Photodiagnosis and Photodynamic Therapy 
Issue Date
fluorescence intensity ; occlusal wear ; quantitative light-induced fluorescence (QLF) ; tooth wear ; tooth wear index (TWI)
BACKGROUND: The difference in autofluorescence between enamel and dentine layer has prompted recommendations to use the quantitative light-induced fluorescence (QLF) method for quantifying tooth wear (TW). This study investigated the potential of QLF for distinguishing the severity of occlusal TW based on differences in the autofluorescence intensity. METHODS: In total, 106 extracted permanent molars and premolars having suspected wear without pulp exposure were used. The severity of wear was determined by visually examining all teeth using the tooth wear index (TWI) of Smith and Knight. QLF images were captured and converted into 8-bit grayscale images. The difference in the fluorescence intensity (ΔG) was calculated by comparing mean grayscale levels between sound and worn areas. Finally, histological examination was conducted by stereomicroscope to confirm the presence of dentine exposure. RESULTS: 100 teeth were included in the final analysis without six teeth having enamel cracks around worn area. The ΔG values increased with the severity of TW as quantified using conventional TWI codes, and differed significantly between the sound and enamel- and dentine-wear teeth (P < 0.001). The histology indicated that enamel remained on 57 teeth, while 43 teeth had dentine-exposed wear and showed significant differences in ΔG compared with enamel-remained teeth. CONCLUSIONS: The fluorescence intensity differed significantly depending on the presence of dentine exposure. ΔG could be used to distinguish between sound and enamel- and dentine-wear teeth with a significant correlation. These findings indicate that QLF could be useful for determining the severity of TW of occlusal surfaces noninvasively.
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2. College of Dentistry (치과대학) > Dept. of Preventive Dentistry and Public Oral Health (예방치과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Orofacial Pain and Oral Medicine (구강내과학교실) > 1. Journal Papers
Yonsei Authors
김백일(Kim, Baek Il) ORCID logo https://orcid.org/0000-0001-8234-2327
김상겸(Kim, Sang-Kyeom) ORCID logo https://orcid.org/0000-0002-6380-5039
최종훈(Choi, Jong Hoon) ORCID logo https://orcid.org/0000-0003-3211-3619
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