The Journal of the American Dental Association
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J Am Dent Assoc, Vol 121, No 6, 712-715.
© 1990 American Dental Association
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Journal of the American Dental Association, Vol 121, Issue 6, 712-715
Copyright © 1990 by American Dental Association

Journal Article

Effect of endodontic access preparation on resistance to crown-root fracture



CA Howe and DJ McKendry
Permanente Dental Associates, Portland.

This investigation involved the creation of coronal-radicular fractures in vitro and compared the fracture resistance of intact human mandibular molars, with molars after varied tooth preparation. Forty freshly extracted, non-carious, nonrestored human mandibular molars were randomly divided into four treatment groups. The molars were subjected to constantly increasing occlusal load until coronal-radicular fracture occurred. Tooth preparations significantly diminished resistance to coronal-radicular fracture.




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