In-Ceram 전부도재관의 shoulder 폭경에 따른 변연적합도

Marginal fit of In-Ceram crown according to shoulder width

본 연구는 치아형성시 shoulder 폭경이 변연 적합도에 미치는 영향을 평가하기 위해 시행하였다. 지대치의 치경부쪽의 shoulder 폭경을 0.6 mm, 0.9 mm, 1.2 mm로 나누어 각각 9개씩, 총 27개의 모형을 제작하여 통법에 따라 In-Ceram 전부 도재관을 제작한 후 시멘트 접착하고 근심, 원심, 협, 설측 중앙 부위를 200배 확대하여 변연 적합도의 측정한 후 각 군과, 측정부위에 따른 변연 적합도 비교해 본 결과 다음과 같은 결론을 얻었다. 1. shoulder 폭경이 0.6 mm인 경우 $81.28{\mu}m$, 0.9 mm인 경우는 $70.78{\mu}m$, 1.2mm 인 경우는 $67.75{\mu}m$의 변연간극을 보였다. 2. shoulder 폭경이 0.6 mm인 경우가 0.9 mm, 1.2 mm인 경우보다 변연간극이 유의한 차이를 크게 나탔났으며(p<0.05), 0.9 mm인 경우와 1.2 mm인 경우는 유의한 차이가 없었다(p>0.05). 3. In-Ceram 시편의 변연부에서 근심측, 원심측, 순측, 설측의 측정위치에 따른 변연적합도의 비교시 유의한 차이가 없었다(p>0.05).

In-Ceram system is one of contemporary esthetic all ceramic restorations and has relatively high flexural strength. The purpose of this study was to evaluate the marginal fit of In-Ceram crown according to shoulder width and measuring position. In this study, twenty seven In-Ceram crowns devided into three groups, each prepared with shoulder width of 0.6mm, 0.9mm and 1.2mm. All specimens were cemented with glass ionomer cement. After cementation, specimens were measured marginal gap between the margin of the In-Ceram crown and the finishing line of resin master die by using a refrective microscope. Marginal gaps were recorded at the labial, lingual, mesial and distal measuring points on the resin master die. The results of this study were as follows: 1. Mean marginal fits of each group were $81.28{\mu}m$ in 0.6mm shoulder width, $70.78{\mu}m$ in 0.9mm shoulder width and $67.75{\mu}m$ in 1.2mm shoulder width. 2. There was significant difference between group 0.6mm and 0.9mm, 1.2mm.(p<0.05). 3. In comparison of marginal fit according to the measuring points, there was no significant difference.