Objectives: To test whether or not alveolar ridge preservation reduces vertical changes in the posterior maxilla compared to spontaneous healing following tooth extraction. Materials and methods: Forty subjects requiring extraction of maxillary posterior teeth with root apices protruding into the maxillary sinus floor were consecutively enrolled. Patients were randomly assigned to either one of two surgical interventions: an alveolar ridge preservation procedure using collagenated bovine bone mineral and a resorbable collagen membrane (test) or no grafting (control). Cone-beam computed tomographies were taken immediately and at 6 months after surgery, prior to dental implant placement. Results: Based on radiographic data, the level of the sinus floor remained stable over time (baseline to 6 months) in the test group (−0.14 mm [−0.31, −0.02]). In the control group, the sinus floor level shifted more coronally (−1.16 mm [−1.73, −0.61]) than the test group (p < 0.05). The test group demonstrated a significantly larger residual bone height than the control group at 6 months (7.30 mm [6.36, 8.20] vs. 4.83 mm [3.94, 5.76], respectively, p < 0.05). Implant placement without any additional sinus augmentation procedure was performed in 42.9% of test group cases, whereas in all of the subjects in the control group an additional augmentation procedure was needed (100% of the cases). Conclusion: Alveolar ridge preservation in the posterior maxilla maintained the vertical bone height more efficiently and resulted in less need for sinus augmentation procedures at 6 months compared to spontaneous healing.
Bibliographical noteFunding Information:
This study was designed as a prospective randomized controlled clinical trial with two parallel study groups, conducted at a sin‐ gle center. Ethics approval for this study was obtained from the Institutional Review Board of Yonsei University Dental Hospital (No.2‐2016‐0033). The study was registered with the Clinical Research Information Service of National Research Institute of Health in Republic of Korea (KCT0003252). This experiment was performed from January 2017 to June 2018. All clinicians and exam‐ iners participating in the trial were calibrated before the surgeries and the measurements. The CONSORT flowchart for randomized controlled clinical trial is presented in Figure 1 (Schulz, Altman, & Moher, 2011).
The project (16‐048) was supported by a grant from the Osteology
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All Science Journal Classification (ASJC) codes
- Oral Surgery