Study on the effect of different impression methods on the marginal fit of all-ceramic crowns
10.7518/hxkq.2015.04.016
- VernacularTitle:不同数字印模方式影响全瓷冠边缘适合性的研究
- Author:
Lilin ZHAN
1
;
Liwei ZENG
;
Ping CHEN
;
Lan LIAO
;
Shiyue LI
;
Renying LIU
Author Information
1. 南昌大学附属口腔医院修复科
- Keywords:
all-ceramic crowns;
optical impression;
marginal fit;
computer aided design/computer aided manufacture
- From:
West China Journal of Stomatology
2015;(4):401-404
- CountryChina
- Language:Chinese
-
Abstract:
Objective??To?investigate?the?effect?of?three?different?impression?methods?on?the?marginal?fit?of?all-ceramic?crowns.?The?three?methods?include?scanning?silicone?rubber?impression,?cast?models,?and?direct?optical?impression. Methods?The?polymethyl?methacrylate?(PMMA)?material?of?a?mandibular?first?molar?in?standard?model?was?prepared?with?16?models?duplicated.?The?all-ceramic?crowns?were?prepared?using?three?different?impression?methods.?Accurate?impressions?were?made?using?silicone?rubber,?and?the?cast?models?were?obtained.?The?PMMA?models,?silicone?rubber?impressions,?and?cast?models?were?scanned,?and?digital?models?of?three?groups?were?obtained?to?produce?48?zirconia?all-ceramic?crowns?with?computer?aided?design/computer?aided?manufacture.?The?marginal?fit?of?these?groups?was?measured?by?silicone?rubber?gap?impression.?Statistical?analysis?was?performed?with?SPSS?17.0?software.?Results??The?marginal?fit?of?direct?optical?impression?groups,?silicone rubber impression groups, cast model groups was (69.18±9.47), (81.04±10.88), (84.42±9.96)μm. A significant diffe-rence?was?observed?in?the?marginal?fit?of?the?direct?optical?impression?groups?and?the?other?groups?(P<0.05).?No?statistically?significant?difference?was?observed?in?the?marginal?fit?of?the?silicone?rubber?impression?groups?and?the?cast?model?groups?(P>0.05).?Conclusion??All?marginal?measurement?sites?are?clinically?acceptable?by?the?three?different?impression?scanning?methods.?The?silicone?rubber?impression?scanning?method?can?be?used?for?all-ceramic?restorations.
