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Updated: Aug 23, 2025
In situ Compressive Loading and Correlative Noninvasive Imaging of the Bone-periodontal Ligament-tooth Fibrous Joint
Published on: March 7, 2014
Statistical analysis of parameters for the ramus, teeth, and biomechanical stress: A retrospective study
Sha Su1, Chang Liu1, Yuheng Zhang1
1Department of Stomatology, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Objective:
To explore the correlation between the anterior border absorption of the mandibular ramus and the occurrence of supernumerary teeth, along with the biomechanical stress.
Design:
The bone mass of mandibular ramus was evaluated on CBCT images by bone mass analysis. In addition, the number of supernumerary teeth and corresponding anatomical positions were recorded.
Results:
The CBCT images of 5100 patients were analyzed. Along with eruption of mandibular permanent molars in sequence, the width of the ramus increased from 29.02 mm to 36.02 mm (P < 0.001). The proportion of the width from the nerve canal to the anterior border of the ramus in the whole ramus decreased from 52.51% to 43.79% (P < 0.001). Meanwhile, among the 5100 participants, 278 supernumerary teeth were identified in 209 patients (4.1%). The predilection loci were close to the regions of central incisors (72.66%) in the maxilla and of the premolars (11.51%) in the mandible.
Conclusions:
Biomechanical stress, mainly pressure during tooth development, was the internal force of anterior border absorption of the mandibular ramus. The release of pressure after tooth eruption is a possible reason for the occurrence of supernumerary teeth.
