J Adv Prosthodont.  2017 Dec;9(6):432-438. 10.4047/jap.2017.9.6.432.

Detection of proximal caries using quantitative light-induced fluorescence-digital and laser fluorescence: a comparative study

  • 1Department of Prosthodontics, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
  • 2Graduate School of Clinical Dentistry, Ewha Womans University, Seoul, Republic of Korea.
  • 3Department of Prosthodontics, School of Medicine, Ewha Womans University, Seoul, Republic of Korea. prosth@ewha.ac.kr


The purpose of this study was to evaluate the in vitro validity of quantitative light-induced fluorescence-digital (QLF-D) and laser fluorescence (DIAGNOdent) for assessing proximal caries in extracted premolars, using digital radiography as reference method.
A total of 102 extracted premolars with similar lengths and shapes were used. A single operator conducted all the examinations using three different detection methods (bitewing radiography, QLF-D, and DIAGNOdent). The bitewing x-ray scale, QLF-D fluorescence loss (ΔF), and DIAGNOdent peak readings were compared and statistically analyzed.
Each method showed an excellent reliability. The correlation coefficient between bitewing radiography and QLF-D, DIAGNOdent were −0.644 and 0.448, respectively, while the value between QLF-D and DIAGNOdent was −0.382. The kappa statistics for bitewing radiography and QLF-D had a higher diagnosis consensus than those for bitewing radiography and DIAGNOdent. The QLF-D was moderately to highly accurate (AUC = 0.753 - 0.908), while DIAGNOdent was moderately to less accurate (AUC = 0.622 - 0.784). All detection methods showed statistically significant correlation and high correlation between the bitewing radiography and QLF-D.
QLF-D was found to be a valid and reliable alternative diagnostic method to digital bitewing radiography for in vitro detection of proximal caries.


Bitewing radiography; Laser fluorescence; Proximal caries detection; Quantitative light-induced fluorescence-digital
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