Abstract
To prevent root fracture related to post and core build-up, its physio-mechanical characteristic has to be considered, so that the stress within the root strucure is equally distributed. This is especially of great importance with regard to “the main masticatory teeth, ” which have to bear constant masticatory stress. In this article, based on clinical fracture cases and research on “the main masticatory teeth, ” particular attention was paid to the buccal frenum, especially its relation with “the main masticatory teeth” and root fracture.
1.“The main masticatory teeth” often coincide with the dominant arm side.
2.“The main masticatory teeth” are primarily the first molars in both the upper and lower arch, and then the second molars.
3. In the upper teeth, the second premolar or first molar to which the buccal frenum is attached tend to be “the main masticatory teeth.”
4. In the lower teeth, no relation is found between the buccal frenum and “the main masticatory teeth.”
5. In the upper teeth, root fracture always occurs in teeth with buccal frenum attachment, whereas in the lower teeth, there is no relation between fractured teeth and frenum attachment.
6. Thus, particular attention has to be paid in the post and core build-up of the upper teeth with the frenum attachment.
