title: Assessing the amount of interdental bone in posterior areas of the mandible for placing orthodontic mini-implants.
abstract: Objective : The aim of this study was to assess the amount of interdental bone in posterior areas of the mandible for placing orthodontic mini-implants to provide and control anchorage in orthodontic treatment. Materials and Methods : The amount of interdental bone in areas between the second premolars and first molars, first and second molars on the right and left sides of the mandible were determined in fifty patients by RVG using periapical radiographs. The images were assessed using Cygnus Media Software to determine the mesio-distal width of the interdental bone, starting at the crest of the alveolar bone (2 mm below the CEJ) every one millimeter up to 12 mm from the CEJ. The actual amount of interdental bone and the effect of related factors were assessed using chi-square test at a 95% confidence interval. Results : The minimum desired interdental bone width for placing mini-implants, 3 mm from the CEJ, between the second premolar and first molar and the first and second molars of the mandible on both sides were significantly different (p<0.01): 1.8 mm (31%) more apical in the area between the second premolar and the first molar. There was also a statistically significant difference between the areas under study on the right side (p<0.002), which was 2.2 mm (44%) more apical in the area of the second premolar and the first molar. Conclusion : The most secure site for placing orthodontic mini-implants in the mandible is between the first and second molars at the height of 5.8 mm from the CEJ.
authors.affiliation: Associated Professor, Department of Periodontics, Islamic Azad University, Dental Branch, Member of Dental Implant Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Nasrin
authors.initials: N
authors.lastname: Esfahanizadeh
authors.affiliation: Post Graduate Student, Department of Orthodontics, Islamic Azad University, Dental Branch, Tehran, Iran.
authors.forename: Damoun
authors.initials: D
authors.lastname: Shahraki
authors.affiliation: Assistant Professor, Legal Medicine Research Center, Tehran, Iran.
authors.forename: Hamidreza
authors.initials: H
authors.lastname: Daneshparvar
authors.affiliation: Professor and Chairman, Department of Radiology, Islamic Azad University, Dental Branch, Tehran, Iran.
authors.forename: Ahmad Reza
authors.initials: AR
authors.lastname: Talaei Pour
authors.affiliation: Assistant Professor, Department of Dental material, Member of Craniofacial Research Center, Islamic Azad University, Dental Branch and Kamal Asgar Research Center (KARC), Tehran, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Saghiri
authors.affiliation: Assistant Professor, Fellow of Orthosurgery, Department of Orthodontics, Azad University Dental School, Tehran, Iran.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Sheibaninia
authors.affiliation: Dentist, Dental Implant Research Center, Tehran University of Medical Scienses, Tehran, Iran.
authors.forename: Shadab
authors.initials: S
authors.lastname: Rashtak
keywords: Bone; Implant; Posterior Teeth