J Korean Acad Prosthodont.  2021 Jul;59(3):271-280. 10.4047/jkap.2021.59.3.271.

Analysis of relationship between cracked tooth syndrome and occlusion using Q-ray and T-scan

• Ahn DG
• Choi JW
• Kim Y
• Pyo SW
• Kim HK

• KMID: 2518726
• DOI: http://doi.org/10.4047/jkap.2021.59.3.271

Abstract

Purpose
The aim of this study was to evaluate the relationship between the patient's occlusion and a cracked tooth by using T-scan occlusal analysis and a quantitative light-induced fluorescence (QLF) technology.
Materials and Methods
This study was carried out on 51 patients having cracked teeth between January, 2019 and December, 2020. The tooth crack was determined with a Q-ray pen and QLF parameters (ΔF_max and ΔR_max) were obtained by a Q-ray software. T-scan tests were conducted to all subjects and then, the occlusal force and disclosing time were analyzed. Mann-Whitney U test was performed to compare the occlusal force and disclosing time between cracked teeth groups and contra-lateral normal teeth groups (α = .05). Mann-Whitney U test was performed to compare ΔF_max and ΔR_max according to the results of cold/bite tests (α = .05). A Spearman correlation analysis was run to determine the relationship between ΔF_max or ΔR_max and occlusal force or disclosing time (α=.05).
Results
The mean occlusal force and disclosing time were significantly higher on cracked teeth than on normal teeth (P < .05). The ΔF_max or ΔR_max were not significantly different according to the results of cold/bite tests (P > .05). There was no correlation between ΔF_max or ΔR_max and occlusal force or disclosing time (P > .05).
Conclusion
There was a significant relationship between occlusion and cracked tooth syndrome. QLF has the potential to be a valuable tool for the diagnosis of tooth crack in clinical practice.

Keyword

Bite force; Cracked tooth syndrome; Dental occlusion; Fluorescence