Evaluation of cortical bone thickness of mandible with cone beam computed tomography for orthodontic mini implant installation

Seyed Hossein Moslemzade, Yusef Kananizadeh, Amin Nourizadeh, Aydin Sohrabi, Mehrdad Panjnoosh, Elnaz Shafiee

Abstract


Background: Achieving maximum anchorage without movement of the teeth in anchorage unit has been a great challenge in orthodontics and the success of the treatment plan highly depends on it. In this case, using orthodontic mini-implants can make a huge difference. The objective of this retrospective study was to measure thickness of cortical bone at prospective mini-implant placement sites in mandible in order to understand stability aspects of mini-implant placement by using cone-beam computed tomography (CBCT) images.

Materials and Methods: Initial 3-dimensional images of 40 adult patients were studied. The cortical bone thickness was obtained at the alveolar processes from canine to second molar at 5 different vertical levels from the cementoenamel junction (CEJ). To determine the cortical bone thickness, tangent lines were drawn buccolingually to the roots in axial section and a third line was drawn from the middle of these two lines, and the cortical bone thickness was measured where the third line crossed the buccal cortex.

 

Results: Mandibular and buccal cortical bone thicknesses were 0.79 to 2.49 mm, respectively. There was a statistically significant increase from the CEJ to the apex (P<0.001), while this increase was not statically significant at interdental area of teeth #3 and #4. Comparing the 4 mm section in all sites showed significant increase from anterior to posterior.

Conclusion: Based on our results, the cortical bone thickness mostly follows a pattern and depends on the interradicular site rather than individual differences.

 

 

Key words: Cone-beam computed tomography; orthodontic anchorage procedures


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References


Lee JS, Kim JK, Park Y-C, Vanarsdall RL. Applications of orthodontic mini implants. Quintessence Publishing Company; 2007.

Sugawara J. A bioefficient skeletal anchorage system. Biomechanics and Esthetic Strategies in Clinical Orthodontics 2005:295-309.

Kim SH, Choi YS, Hwang EH, Chung KR, Kook YA, Nelson G. Surgical positioning of orthodontic mini-implants with guides fabricated on models replicated with cone-beam computed tomography. Am J Orthod Dentofacial Orthop. 2007;131(4 Suppl):S82-9.

Upadhyay M, Yadav S, Nanda R. Vertical-dimension control during en-masse retraction with mini-implant anchorage. Am J Orthod Dentofacial Orthop. 2010;138(1):96-108.

Wagner JD, Baack B, Brown GA, Kelly J. Rapid 3-dimensional prototyping for surgical repair of maxillofacial fractures: a technical note. J Oral Maxillofac Surg. 2004;62(7):898-901.

Huang J, Bumann A, Mah J. Three-dimensional radiographic analysis in orthodontics. J Clin Orthod. 2005;39(7):421-8.

Hamada Y, Kondoh T, Noguchi K, Iino M, Isono H, Ishii H, Mishima A, Kobayashi K, Seto K. Application of limited cone beam computed tomography to clinical assessment of alveolar bone grafting: a preliminary report. Cleft Palate Craniofac J. 2005;42(2):128-37.

Deguchi T, Nasu M, Murakami K, Yabuuchi T, Kamioka H, Takano-Yamamoto T. Quantitative evaluation of cortical bone thickness with computed tomographic scanning for orthodontic implants. Am J Orthod Dentofacial Orthop. 2006;129(6):721.e7-12.

Kim HJ, Yun HS, Park HD, Kim DH, Park YC. Soft-tissue and cortical-bone thickness at orthodontic implant sites. Am J Orthod Dentofacial Orthop. 2006;130(2):177-82.

Poggio PM, Incorvati C, Velo S, Carano A. “Safe zones”: a guide for miniscrew positioning in the maxillary and mandibular arch. Angle Orthod. 2006;76(2):191-7.

Schnelle MA, Beck FM, Jaynes RM, Huja SS. A radiographic evaluation of the availability of bone for placement of miniscrews. Angle Orthod. 2004;74(6):832-7.

Chun Y, Lim W. Bone density at interradicular sites: implications for orthodontic mini-implant placement. Orthod Craniofac Res. 2009;12(1):25-32.

Baumgaertel S, Hans MG. Buccal cortical bone thickness for mini-implant placement. Am J Orthod Dentofacial Orthop. 2009;136(2):230-5.

Lim J, Lee S, Kim Y, Lim W, Chun Y. Comparison of cortical bone thickness and root proximity at maxillary and mandibular interradicular sites for orthodontic mini-implant placement. Orthod Craniofac Res. 2009;12(4):299-304.

Park J, Cho HJ. Three-dimensional evaluation of interradicular spaces and cortical bone thickness for the placement and initial stability of microimplants in adults. Am J Orthod Dentofacial Orthop. 2009;136(3):314.e1-12.

Melsen B, Bosch C. Different approaches to anchorage: a survey and an evaluation. Angle Orthod. 1997;67(1):23-30.

Quinn RS, Yoshikawa DK. A reassessment of force magnitude in orthodontics. Am J Orthod. 1985;88(3):252-60.

Burstone CJ. The segmented arch approach to space closure. Am J Orthod. 1982;82(5):361-78.

Kuhlberg AJ, Burstone CJ. T-loop position and anchorage control. Am J Orthod Dentofacial Orthop. 1997;112(1):12-8.

Kanomi R. Mini-implant for orthodontic anchorage. J Clin Orthod. 1997;31(11):763-7.


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