Marginal accuracy and fracture strength of conventional and copy-milled all-ceramic crowns.
In this comparative in vitro study, the marginal accuracy and fracture strength of conventional and copy-milled In-Ceram crowns were examined. Anterior crowns with medians of 32.5 microns for the conventional technique and 38 microns for the copy-milled units had significantly smaller gaps than premolar crowns that had a median marginal gap of 45 microns for both techniques. There was a significant difference in fracture strength only for anterior crowns. The study indicates that copy-milled In-Ceram crown have clinically acceptable margins and fracture strength and reduce laboratory fabrication time.
Rinke
S
S
Department of Prosthodontics, Dental School, Georg-August-University, Germany.
Hüls
A
A
Jahn
L
L
D000537:Aluminum Oxide; D000704:Analysis of Variance; D001641:Bicuspid; D003442:Crowns; D003735:Dental Casting Technique; D018772:Dental Marginal Adaptation; D003775:Dental Polishing / Q000379:methods*; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D007180:Incisor; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D018709:Statistics, Nonparametric; D013674:Technology, Dental / Q000379:methods*
C078572:Celay; D003776:Dental Porcelain; C070870:In-Ceram; D000537:Aluminum Oxide