Patrick B Holmes1, Bethany J Wolf2, Jing Zhou3. 1. a Orthodontist, Private practice, Virginia Beach, Va. 2. b Assistant Professor, Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC. 3. c Assistant Professor and Interim Director, Orthodontics Postgraduate Program, Department of Pediatric Dentistry and Orthodontics, College of Dental Medicine, Medical University of South Carolina, Charleston, SC.
Abstract
OBJECTIVE: To provide a road map of buccal cortical bone thickness in interradicular locations where miniscrew implants are commonly placed. MATERIALS AND METHODS: Cone-beam computed tomography images from 100 study quadrants (50 maxillary and 50 mandibular) were studied. Cortical bone thickness was measured at the most mesial point, the midpoint, and the most distal point in interradicular areas from the canine to the first molar in both arches at 4 mm and 6 mm from the alveolar ridge. Indicator variables of whether the cortical bone thickness was thinner than 1 mm and thicker than 1.5 mm were constructed and analyzed in a general linear mixed model. RESULTS: Buccal cortical bone was significantly thinner at a point bisecting two teeth than the bone adjacent to the teeth (P < .0001). The site with the greatest percentage of measurements <1 mm (20%) was at the midpoint bisecting the mandibular canine and the first premolar. The site with the highest percentage of measurements >1.5 mm (50%) was in the mandible adjacent to the first molar (distal to the midpoint of the second premolar and first molar) at 6 mm from the alveolar crest. CONCLUSION: Cortical bone thickness is significantly thinner centrally between two teeth than in the areas adjacent to the roots.
OBJECTIVE: To provide a road map of buccal cortical bone thickness in interradicular locations where miniscrew implants are commonly placed. MATERIALS AND METHODS: Cone-beam computed tomography images from 100 study quadrants (50 maxillary and 50 mandibular) were studied. Cortical bone thickness was measured at the most mesial point, the midpoint, and the most distal point in interradicular areas from the canine to the first molar in both arches at 4 mm and 6 mm from the alveolar ridge. Indicator variables of whether the cortical bone thickness was thinner than 1 mm and thicker than 1.5 mm were constructed and analyzed in a general linear mixed model. RESULTS: Buccal cortical bone was significantly thinner at a point bisecting two teeth than the bone adjacent to the teeth (P < .0001). The site with the greatest percentage of measurements <1 mm (20%) was at the midpoint bisecting the mandibular canine and the first premolar. The site with the highest percentage of measurements >1.5 mm (50%) was in the mandible adjacent to the first molar (distal to the midpoint of the second premolar and first molar) at 6 mm from the alveolar crest. CONCLUSION: Cortical bone thickness is significantly thinner centrally between two teeth than in the areas adjacent to the roots.
Authors: Carmen E Brisceno; P Emile Rossouw; Roberto Carrillo; Robert Spears; Peter H Buschang Journal: Am J Orthod Dentofacial Orthop Date: 2009-03 Impact factor: 2.650
Authors: Claudie Berger; Lisa Langsetmo; Lawrence Joseph; David A Hanley; K Shawn Davison; Robert Josse; Nancy Kreiger; Alan Tenenhouse; David Goltzman Journal: CMAJ Date: 2008-06-17 Impact factor: 8.262