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Effect of 3 vertical facial patterns on alveolar bone quality at selected miniscrew implant sites
Hua Li1, Hao Zhang, Roger J Smales
1*MD Student, Institute of Stomatology, Nanjing Medical University, Nanjing, People's Republic of China; Resident, Department of Orthodontics, Zhenjiang Stomatological Hospital, Zhenjiang, People's Republic of China. †MD Student, Institute of Stomatology, Nanjing Medical University, Nanjing, People's Republic of China ‡Visiting Research Fellow, School of Dentistry, Faculty of Health Sciences, The University of Adelaide, Adelaide, Australia. §Associate Professor, Institute of Stomatology, Nanjing Medical University, Nanjing, People's Republic of China. ‖Professor, Institute of Stomatology, Nanjing Medical University, Nanjing, People's Republic of China.
Objective:
To evaluate dental alveolar bone quality among young healthy Chinese adults having 3 different vertical patterns.
Materials And Methods:
Three-dimensional cone-beam computed tomography images of 101 subjects (15 low-angle, 48 average-angle, and 38 high-angle) were reconstructed. Facial alveolar cortical bone thicknesses and cortical and cancellous bone densities at 4 selected miniscrew implant sites in both arches, together with cancellous bone densities of third cervical vertebrae, were measured. Bone qualities were compared among the 3 vertical pattern groups.
Results:
The cortical bone thicknesses at mandibular 5-6 and 6-7 and the cortical and cancellous bone densities at maxillary and mandibular 5-6 and 6-7 were generally greater in the low-angle than in the other 2 groups. There was no similar consistent vertical pattern apparent for bone quality at the 1-1 and 1-2 sites. No significant differences in bone densities for third cervical vertebrae were found among the 3 groups.
Conclusion:
Careful selection of suitable implantation sites and sizes of the miniscrews used should be made to reduce the possible occurrence of implant loosening in patients with average-angle and high-angle vertical facial patterns in particular.
