| 지상강좌 1 - 비우식성 치경부병소와 치경부 복합레진수복의 응력분석 |
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박정길 |
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부산대학교 치의학전문대학원 치과보존학교실 |
| Stress analysis of non carious cervical lesion and cervical composite resin restoration |
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Jeong-Kil Park |
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Department of Conservative dentistry, School of Dentistry, Pusan National University |
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| Abstract |
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Noncarious cervical lesions(NCCLs) are characterized as structural defects found on the tooth surface of the cement-enamel junction. Loss of tooth structure through noncarious mechanisms may vary in etiology and clinical presentation for each individual but presently many clinician now classify this as tooth failure of abfraction due to the stress applied in the cervical area of the tooth under oral physiological and pathological loads. In the current study, we investigated the stress distribution of maxillary premolar with NCCL using simulated 3D finite element analysis. The results were as follows: 1. In the sound maxillary premolar, the stresses were highly concentrated at cervical enamel surface of the mesiobuccal line angle, asymmetrically. 2. Once the lesion has been formed, the highest stress concentration was observed around the apex of the wedge shaped lesion. 3. In four types of NCCL, the patterns of stress distribution were similar and the peak stress was observed at mesial corner and also stresses concentrated at lesion apex. 4. Lesion cavity modification of rounding apex, reduced stress of lesion apex. 5. When restoring the notch-shaped lesion, material with high elastic modulus worked well at the lesion apex and material with low elastic modulus worked well at the cervical cavosurface margin. |
| Key Words:
Noncarious cervical lesion;abfraction;stress;finite element analysis;maxillary premolar; |
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