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KMID : 0362420100480040301
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Journal of Korean Academy of Prosthodontics
2010 Volume.48 No. 4 p.301 ~ p.307
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A study on enamel thickness of maxillary incisors using X-ray micro computed tomography
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Cho Young-Won
Cho Jin-Hyun
Lee Kyu-Bok
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Abstract
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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) (×20) 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.
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KEYWORD
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Enamel thickness, MicroCT (X-Ray Micro Computed Tomography), Scanning Electron Microscopy, Cementoenamel junction, Porcelain laminate veneer
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