The aim of this retrospective study is to present a guide for the clinicians by detecting the best mini screw placement areas with the measurement of cortical bone thickness in the patients who have cone beam computed tomography (CBCT) images. Additionally to be protected from root damage and a potential damage to environmental anatomic tissues, related measurements will also be held in the determined areas.This study has been evaluated by using the images of 52 patients taken by cone beam computed tomography for diagnosis and cure.In the mandibular measurements which were done by using CBCT, the buccal cortical bone thickness has been found out to increase while going towards the posterior region and going down to the apical region at the same area. In addition, it was observed mostly between second premolar and f irst molar teeth at the farthest area from the top of the crest, along the mandibular canal. The distance between base of the nose and maxillar sinus floor to the hill of the crest has also been observed that decreased towards the posterior region.Although it can vary according to the person, in mini screw applications, mandibular cortical bone structure and the interradicular range is more suitable than the upper jaw. To be protected from the potential complications and for a better stability, radiologic analysis is recommended to the patient before the mini screw placement.
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Melsen B. and C.Verna.The Aarhus anchorage system. in Semin Orthod. 2005;11:24-31.
Creekmore, T.D. and M.K. Eklund, The possibility of skeletal anchorage. J of Clinical Orthodontics: JCO. 1983;17:266.
Miyawaki S, Koyama I, Inoue M, et al. Factors associated with the stability of titanium screws placed in the posterior region for orthodontic anchorage. Am J Orthod Dentofacial Orthop. 2003;124:373-8.
Wehrbe H. and B.R. Merz. Aspects of the use of endosseous palatal implants in orthodontic therapy. J of Esthetic and Restorative Dentistry. 1998;10:315-324.
Wilmes B, Rademacher C, Olthoff G, et al., Parameters affecting primary stability of orthodontic mini-implants. J Orofac Orthop. 2006;67:162-74.
Huja SS, Litsky AS, Beck FM, et al., Pull-out strength of monocortical screws placed in the maxillae and mandibles of dogs. Am J Orthod Dentofacial Orthop. 2005;127:307-13.
Palomo, J.M, Leena Palomo, Chung H Kau, et al, Three-dimensional cone beam computerized tomography in dentistry. Dentistry Today. 2006;25:130.
Schwartz-Dabney CL, P.C. Dechow. Variations in cortical material properties throughout the human dentate mandible. Am J Phys Anthropol. 2003;120: 252-77.
Kang, S, Lee SJ, Ahn SJ, et al., Bone thickness of the palate for orthodontic mini-implant anchorage in adults. Am J Orthod Dentofacial Orthop. 2007;131:74-81.
10. Morea C, Dominguez GC, Wuo AV et al Surgical guide for optimal positioning of mini-implants. J Clin Orthod. 2005;39:317-21.
11. Cousley RR, Parberry DJ, Surgical stents for accurate miniscrew insertion. J Clin Orthod. 2006;40:412-7. 12. Kravitz N, Kusnoto B. Risks and complications of orthodontic miniscrews. Am J Orthod Dentofacial Orthop. 2007;131:43-51.
13. Monnerat C, Restle L, Mucha JN. Tomographic mapping of mandibular interradicular spaces for placement of orthodontic mini-implants. Am J Orthod Dentofacial Orthop. 2009;135:1-9.
14. Ardekian L, Efrat Oved-Peleg, Eli E. Mactei et al. The clinical significance of sinus membrane perforation during augmentation of the maxillary sinus. J Oral Maxillofac Surg. 2006;64:277-82.
15. Poggio PM, C Incorvati, S Velo, et al. “Safe zones”: a guide for miniscrew positioning in the maxillary and mandibular arch. Angle Orthod. 2006;76: 191-7.
16. Park J, HJ Cho. Three-dimensional evaluation of interradicular spaces and cortical bone thickness for the placement and initial stability of microimplants in adults. Am Orthod Dentofacial Orthop. 2009;136:314-5.
17. Farnsworth D, PE Rossouw, RF Ceen et al. Cortical bone thickness at common miniscrew implant placement sites. Am J Orthod Dentofacial Orthop. 2011;139:495-503.
18. Baumgaertel, S. and M.G. Hans. Buccal cortical bone thickness for miniimplant placement. Am J Orthod Dentofacial Orthop. 2009;136:230-5.
19. Suer, B.T, E Yıldırım, S Karacay et al. Evaluation of safe zones for miniscrew placement in Class II patients with different vertical skeletal patterns. Gulhane Medical Journal. 2015;57:221-8.
20. T Masumoto, I Hayashi, A Kawamura, et al. Relationships among facial type, buccolingual molar inclination, and cortical bone thickness of the mandible. Eur J Orthod. 2001;23:15-23.
21. M Tsunori, M Mashita, K Kasai. Relationship between facial types and tooth and bone characteristics of the mandible obtained by CT scanning. Angle Orthod. 1998;68:557-62.
22. Varrela J. Dimensional variation of craniofacial structures in relation to changing masticatory-functional demands. Eur J Orthod. 1992;14:31-6.