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Load fatigue of teeth restored with cast posts and cores and complete crowns.
Int J Prosthodont. 1995 Mar-Apr; 8(2):155-61.IJ

Abstract

Twenty-five extracted human central incisors were divided into five groups and prepared for complete cast crowns. Test teeth had cast dowel cores fabricated with the ferrule height varying from 0.5 to 2.0 mm in 0.5-mm increments. The five control teeth did not have cast dowel cores. A 4.0-kg load was applied to each of the restored teeth at an angle of 135 degrees to the long axis of each tooth. This load was applied cyclically at a rate of 72 cycles per minute. The load application point was predetermined by a waxing jig that was used to wax all crowns. The primary variable was the ferrule length. The independent variable was the number of load cycles required to create preliminary failure. Preliminary failure was defined here as the loss of the sealing cement layer between crown and tooth. An electrical resistance strain gauge was used to provide evidence of preliminary failure. The results of this study showed that the 0.5 mm and 1.0 mm ferrule lengths failed at a significantly lower number of cycles than the 1.5 mm and 2.0 mm ferrule lengths and control teeth.

Authors+Show Affiliations

Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle 98195, USA.No affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

7575967

Citation

Libman, W J., and J I. Nicholls. "Load Fatigue of Teeth Restored With Cast Posts and Cores and Complete Crowns." The International Journal of Prosthodontics, vol. 8, no. 2, 1995, pp. 155-61.
Libman WJ, Nicholls JI. Load fatigue of teeth restored with cast posts and cores and complete crowns. Int J Prosthodont. 1995;8(2):155-61.
Libman, W. J., & Nicholls, J. I. (1995). Load fatigue of teeth restored with cast posts and cores and complete crowns. The International Journal of Prosthodontics, 8(2), 155-61.
Libman WJ, Nicholls JI. Load Fatigue of Teeth Restored With Cast Posts and Cores and Complete Crowns. Int J Prosthodont. 1995 Mar-Apr;8(2):155-61. PubMed PMID: 7575967.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Load fatigue of teeth restored with cast posts and cores and complete crowns. AU - Libman,W J, AU - Nicholls,J I, PY - 1995/3/1/pubmed PY - 1995/3/1/medline PY - 1995/3/1/entrez SP - 155 EP - 61 JF - The International journal of prosthodontics JO - Int J Prosthodont VL - 8 IS - 2 N2 - Twenty-five extracted human central incisors were divided into five groups and prepared for complete cast crowns. Test teeth had cast dowel cores fabricated with the ferrule height varying from 0.5 to 2.0 mm in 0.5-mm increments. The five control teeth did not have cast dowel cores. A 4.0-kg load was applied to each of the restored teeth at an angle of 135 degrees to the long axis of each tooth. This load was applied cyclically at a rate of 72 cycles per minute. The load application point was predetermined by a waxing jig that was used to wax all crowns. The primary variable was the ferrule length. The independent variable was the number of load cycles required to create preliminary failure. Preliminary failure was defined here as the loss of the sealing cement layer between crown and tooth. An electrical resistance strain gauge was used to provide evidence of preliminary failure. The results of this study showed that the 0.5 mm and 1.0 mm ferrule lengths failed at a significantly lower number of cycles than the 1.5 mm and 2.0 mm ferrule lengths and control teeth. SN - 0893-2174 UR - https://www.unboundmedicine.com/medline/citation/7575967/Load_fatigue_of_teeth_restored_with_cast_posts_and_cores_and_complete_crowns_ DB - PRIME DP - Unbound Medicine ER -