Journal of Periodontal and Implant Science
- 제30권2호
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- Pages.455-472
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- 2000
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- 2093-2278(pISSN)
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- 2093-2286(eISSN)
치주처치를 위한 기구의 반복 사용시 도재관 변연부 변화에 관한 입체 및 주사탐침현미경적 연구
The Stereomicroscope and SPM Study on the Marginal Change of Porcelain Crown in Various Repeated Instrumentations for Periodontal Therapy
- Lee, Si-Cheol (Department of Periodontology, College of Dentistry, Dan-kook National University) ;
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Chung, Chin-Hyung
(Department of Periodontology, College of Dentistry, Dan-kook National University) ;
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Yim, Seong-Bin
(Department of Periodontology, College of Dentistry, Dan-kook National University)
- 발행 : 2000.06.30
초록
Instrumentation for periodontal therapy may induce marginal damage which increases plaque accumulation and result in periodontal disease. But there have not been many reports of instrumentations on the artificial crown so far. Therefore this study is conducted to evaluate the effects of various repeated instrumentations on the porcelain crown marginal portion. Of the 10 extracted periodontally diseased maxillary first premolars, were 12 proximal surface used in this study. The finishing line of the preparation was placed on the root surface below CEJ and then the crown was cast and cemented in usual manner. Every 4 surfaces of the 3 instruments-curet, ultrasonic scaler, and ultrasonic curet- is used. and four samples used in each instruments. The relevant procedures and measurements were repeated 3 times in each surfaces. Marginal gap is measured by the microscope and surface roughness, Scannig Probe Microscope. Measurements are made at 5 points in each surfaces, making 20 points in each instrument. The results evaluated statistically were as follows 1. As instrumentation was repeated, both marginal gap and roughness were increased in all group 2. In the hand curet, marginal gap was increased every instrumentation and roughness was increased after second. 3. In the ultrasonic scaler, both marginal gap and roughness were increased every instrumentation. 4. In the ultrasonic curet, marginal gap was increased after third instrumentation and roughness was increased after second. 5. Marginal gap and roughness used by the ultrasonic curet were lower than the others and no difference was seen between the hand curet and ultrasonic scaler From the results of this study, the ultrasonic curet was useful in some aspect, but careful instrumentation was needed. Furthermore it was important to minimize the instrumentation through complete periodontal therapy before setting and adequate plaque control.
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