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The effect of thermal change on various dowel-and-core restorative materials
H S Yang1, L A Lang, A D Guckes
1College of Dentistry, Chonnam National University, Kwangju, Korea.
Statement Of Problem:
Severe thermal stresses caused by food-induced temperature changes may result in dowel-and-core failure.
Purpose:
This study investigated the influence of thermal stresses on various combinations of dowel-and-core materials of a restored endodontically treated incisor.
Material And Methods:
A 2-dimensional finite element model was constructed in a labiolingual cross-sectional view of a maxillary central incisor, a dowel, a core, and the supporting tissues to investigate thermal stress distribution. Four combinations of dowel-and-core materials were used: (1) gold/gold, (2) stainless steel/resin composite, (3) stainless steel/amalgam, and (4) carbon fiber-reinforced composite/resin composite. For thermal analysis, a cold irritant (0 degrees C) was applied on the outer surface of a metal-ceramic crown for 7 seconds.
Results:
The metal dowel and core generated lower thermal stresses in the restorations and dentin than the nonmetallic dowel and cores.
Conclusion:
Stress level is closely related to the degree of thermal gradient. The nonmetallic dowel and cores generated greater thermal stresses than metal dowel and cores.
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