Alveolar Buccal Bone Overbuilding Before Tooth Extraction: A Preclinical Study.

BACKGROUND: After tooth extraction, a physiological shrinkage of the alveolar ridge occurs. Applying a buccal overbuilding some months before tooth extraction may create a stiffer hard tissue that might protect the alveolar crest from resorption. Hence, the aim of this experiment was to evaluate the dimensional changes in the alveolar crest after buccal overbuilding performed before tooth extraction.

MATERIALS AND METHODS: At the test sites, an alveolar crest overbuilding was performed on the buccal aspect of the distal root of the third premolar using xenograft covered with a collagen membrane. No treatment was applied at the control sites. After 3 months, the distal roots of both third premolars were extracted and implants were immediately installed into the alveolus allowing a non-submerged healing. After 3 months, biopsies were collected.

RESULTS: At the histological analyses, no statistically significant differences in hard tissue dimensions were found. The buccal bone plate at the test sites presented a tendency of higher resorption compared to the control sites. However, if the contribution of the residues of biomaterial was considered, a higher volumetric gain was registered at the test than at the control sites.

CONCLUSIONS: The buccal overbuilding performed before tooth extraction did not contribute to the preservation of the alveolar crest dimensions after extraction. This could be due to failure to incorporate the graft into the newly formed bone.