Abstract
OBJECTIVES
CAD/CAM-technologies aim for a standardized, accurate production of dental restorations out of high strength materials (zirconia). The three-dimensional internal fit of CAD/CAM-manufactured zirconia copings was evaluated in vitro to verify the realizability of this aim.
METHODS
The analysis was based on ceramic master dies of prepared teeth and corresponding virtual CAD surfaces. Five copings per die were manufactured with two different CAD/CAM-technologies: milling and grinding. The internal fit was determined by a three-dimensional replica technique by optical digitization and computer-assisted analysis.
RESULTS
Mean internal gaps were 134/84μm (SD 78/28) for molar and 93/69μm (SD 56/35) for premolar copings (milling/grinding) using a digitizable silicone for the replicas representing the cement space; they were statistically significant regarding tooth and CAD/CAM-system (p<0.001).
SIGNIFICANCE
All zirconia copings showed an internal accuracy of fit where the gap widths ranged within the current clinical recommendations. However, there still is room for improvement and further standardization of CAD/CAM-technologies.
TY - JOUR
T1 - Three-dimensional fit of CAD/CAM-made zirconia copings.
AU - Moldovan,Ovidiu,
AU - Luthardt,Ralph G,
AU - Corcodel,Nicoleta,
AU - Rudolph,Heike,
Y1 - 2011/10/07/
PY - 2010/12/25/received
PY - 2011/04/23/revised
PY - 2011/09/15/accepted
PY - 2011/10/11/entrez
PY - 2011/10/11/pubmed
PY - 2012/3/2/medline
SP - 1273
EP - 8
JF - Dental materials : official publication of the Academy of Dental Materials
JO - Dent Mater
VL - 27
IS - 12
N2 - OBJECTIVES: CAD/CAM-technologies aim for a standardized, accurate production of dental restorations out of high strength materials (zirconia). The three-dimensional internal fit of CAD/CAM-manufactured zirconia copings was evaluated in vitro to verify the realizability of this aim. METHODS: The analysis was based on ceramic master dies of prepared teeth and corresponding virtual CAD surfaces. Five copings per die were manufactured with two different CAD/CAM-technologies: milling and grinding. The internal fit was determined by a three-dimensional replica technique by optical digitization and computer-assisted analysis. RESULTS: Mean internal gaps were 134/84μm (SD 78/28) for molar and 93/69μm (SD 56/35) for premolar copings (milling/grinding) using a digitizable silicone for the replicas representing the cement space; they were statistically significant regarding tooth and CAD/CAM-system (p<0.001). SIGNIFICANCE: All zirconia copings showed an internal accuracy of fit where the gap widths ranged within the current clinical recommendations. However, there still is room for improvement and further standardization of CAD/CAM-technologies.
SN - 1879-0097
UR - https://www.unboundmedicine.com/medline/citation/21983002/Three_dimensional_fit_of_CAD/CAM_made_zirconia_copings_
L2 - https://linkinghub.elsevier.com/retrieve/pii/S0109-5641(11)00834-7
DB - PRIME
DP - Unbound Medicine
ER -
