TY - JOUR
T1 - Deformation of crowns during cementation
AU - Wilson, Peter R.
AU - Goodkind, Richard J.
AU - Delong, Ralph
AU - Sakaguchi, Ronald
N1 - Funding Information:
Supported by NATO advanced course studentship No. 87600010. Semifinalist, American College of Prosthodontists John J. Sharry Research Award competition. *NATO Scholar, Graduate Prosthodontics. **Professor, Acting Chair, Department of Rehabilitative Sciences, and Co-Director, Graduate Prosthodontics. ***Associate Professor, Department of Biomaterials. ****Assistant Professor, Department of Biomaterials. 1011122246
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1990/11
Y1 - 1990/11
N2 - Deformation of crowns during cementation was investigated by a simple loading system of defined crowns with silicone fluids as cements. Deformation of the crowns was measured by long strain gauges that encircled the cervical margins. Die spacing was simulated by etching the die. Venting was simulated by removing a small screw. Deformation of the crowns was decreased by decreasing the viscosity of fluid, increasing the thickness of the crowns, and venting. Etching the die decreased the seating times of the crowns, but did not alter the level of deformation. Terminal cementation with zinc phosphate cement confirmed the presence of crown deformation during cementation. The results have consequences for bonded and all-ceramic crowns, and explain several clinical phenomena. It is suggested that low viscosity cements, low seating forces, and die spacing be used to decrease the deformation of crowns during seating. The importance of passive fitting of the crown to the tooth is stressed.
AB - Deformation of crowns during cementation was investigated by a simple loading system of defined crowns with silicone fluids as cements. Deformation of the crowns was measured by long strain gauges that encircled the cervical margins. Die spacing was simulated by etching the die. Venting was simulated by removing a small screw. Deformation of the crowns was decreased by decreasing the viscosity of fluid, increasing the thickness of the crowns, and venting. Etching the die decreased the seating times of the crowns, but did not alter the level of deformation. Terminal cementation with zinc phosphate cement confirmed the presence of crown deformation during cementation. The results have consequences for bonded and all-ceramic crowns, and explain several clinical phenomena. It is suggested that low viscosity cements, low seating forces, and die spacing be used to decrease the deformation of crowns during seating. The importance of passive fitting of the crown to the tooth is stressed.
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U2 - 10.1016/0022-3913(90)90136-Z
DO - 10.1016/0022-3913(90)90136-Z
M3 - Article
C2 - 2090822
AN - SCOPUS:0025519905
SN - 0022-3913
VL - 64
SP - 601
EP - 609
JO - Journal of Prosthetic Dentistry
JF - Journal of Prosthetic Dentistry
IS - 5
ER -