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Effect of Primary Stability and Soft- and Hard-Tissue Thickness on Marginal Bone Loss: A Prospective Pilot Study
Johnny Nohra1, Maroun Dagher1, Ghassan Matni2
1Senior Lecturer, Department of Periodontology, Faculty of Dental Medicine, Saint-Joseph University, Beirut, Lebanon.
Objective:
To compare prospectively the effect of different insertion torques (ITs) on marginal bone stability and study the effect of soft-tissue and buccal bone thickness as confounding factors while using a 3-dimensional radiographic evaluation.
Materials And Methods:
Thirty-nine implants were placed in 22 patients. IT, soft-tissue thickness, and buccal bone thickness were recorded at implant placement. Marginal bone loss was evaluated on individualized periapical radiographs and cone-beam computed tomography at 1 year after loading.
Results:
Three groups of implants emerged based on their IT: group I (<30 Ncm), group II (between 30-45 Ncm), and group III (>45 Ncm). Soft-tissue thickness was ≤2 mm in 10 implants (25.6% thin biotype) and more than 2 mm in 29 implants (74.4% thick biotype). No significant difference in marginal bone loss was found for different IT and different soft-tissue thickness. A significant correlation was found between initial buccal bone thickness (≥2 mm or <2 mm) and marginal bone loss at 1 year.
Conclusions:
IT and mucosal tissue thickness did not influence marginal bone loss. Buccal bone thickness of ≥2 mm was associated with a minimal marginal bone remodeling.
