A study on enamel thickness of maxillary incisors using X-ray micro computed tomography.
10.4047/jkap.2010.48.4.301
- Author:
Young Won CHO
1
;
Jin Hyun CHO
;
Kyu Bok LEE
Author Information
1. Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Korea. kblee@knu.ac.kr
- Publication Type:Original Article
- Keywords:
Enamel thickness;
MicroCT (X-Ray Micro Computed Tomography);
Scanning Electron Microscopy;
Cementoenamel junction;
Porcelain laminate veneer
- MeSH:
Axis, Cervical Vertebra;
Dental Enamel;
Dental Porcelain;
Electrons;
Incisor;
Microscopy, Electron, Scanning;
Tokyo;
Tooth;
Tooth Cervix;
X-Ray Microtomography
- From:The Journal of Korean Academy of Prosthodontics
2010;48(4):301-307
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: The objectives of the current study are to assess the accuracy of X-Ray Micro Computed Tomography (microCT) in measuring enamel thickness and to evaluate enamel thickness in maxillary incisors of Koreans. MATERIAL AND METHODS: Five maxillary incisors were embedded in resin block. These teeth were longitudinally sectioned labiolingually through the medial axis. After polishing, the teeth were scanned using a microCT (X-EYE SYSTEM; DRGEM, Seoul, Korea). On a scanning electron microscope (S-4300; Hitachi, Tokyo, Japan) (x20) and a microCT, nearly identical planes were reconstructed. In each tooth, the thickness of labial enamel was measured 1, 3 and 5 mm above the cementoenamel junction (CEJ). Thus, the accuracy of the microCT was evaluated. In addition, using 26 maxillary central incisors and 11 maxillary lateral incisors, in the medial axis and 2 mm remote areas mesially and distally from the medial axis, the thickness of labial enamel was measured 1, 3 and 5 mm above the CEJ along the long axis of the teeth RESULTS: Measurements from nearly identical planes in physical and microCT sections differed by 3.81%. An independent t-test was performed and this showed that there were no significant differences in the measurements between the two methods. Mean values of labial enamel thickness in maxillary central incisors 1, 3 and 5 mm above the CEJ were 0.32 +/- 0.01, 0.50 +/- 0.02 and 0.70 +/- 0.02 mm, respectively. Mean values of labial enamel thickness in maxillary lateral incisors 1, 3 and 5 mm above the CEJ were 0.30 +/- 0.01, 0.55 +/- 0.03 and 0.80 +/- 0.02 mm, respectively. CONCLUSION: In measuring enamel thickness, microCT is one of useful way of measurement. So according to the results of this research, when restoring a porcelain laminate veneer on maxillary incisors in Koreans, careful consideration is needed in the amount of enamel reduction.
