Effect of thermocycling on the fracture strength of intact third molars stored for two different time periods

This study investigated the effect of thermocycling on the fracture strength of intact, extracted molars stored for two different intervals before testing. Thirty-eight recently extracted molars and 38 molars stored for 1 to 5 years were each randomly separated to create four subgroups. One subgroup...

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Bibliographic Details
Published in:Military medicine 2002-08, Vol.167 (8), p.616-619
Main Authors: HAGGE, Mark S, LINDEMUTH, James S
Format: Article
Language:English
Subjects:
Biological and medical sciences
Bond strength
Composite materials
Dentin
Drinking water
Facial bones, jaws, teeth, parodontium: diseases, semeiology
Hot Temperature - adverse effects
Humans
Interfaces
Investigations
Materials Testing - methods
Medical sciences
Molar, Third
Non tumoral diseases
Otorhinolaryngology. Stomatology
Permeability
Specimen Handling
Teeth
Time Factors
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Summary:This study investigated the effect of thermocycling on the fracture strength of intact, extracted molars stored for two different intervals before testing. Thirty-eight recently extracted molars and 38 molars stored for 1 to 5 years were each randomly separated to create four subgroups. One subgroup from each storage interval was thermocycled 1,000 times from 5 to 55 degrees C using 30-second dwell times, and then all teeth were fractured using a universal testing machine. Thermocycled recently extracted molars had significantly lower mean fracture strengths than nonthermocycled recently extracted molars (p < 0.001). No other pairwise comparisons were statistically significant. Thermocycling significantly reduced the fracture strength of recently extracted third molars. However, no significant differences in fracture strength were seen with molars stored for 1 to 5 years before thermocycling.
ISSN:0026-4075
1930-613X
DOI:10.1093/milmed/167.8.616