The safety zone for mini-implant maxillary anchorage in Mongoloids

Wey, M.C. and Shim, C.N. and Lee, M.Y. and Jamaluddin, M. and Ngeow, Wei Cheong (2012) The safety zone for mini-implant maxillary anchorage in Mongoloids. Australian Orthodontic Journal, 28 (1). pp. 17-21. ISSN 0587-3908,


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Aim: This study aimed to establish a safety zone for the placement of mini-implants in the buccal surface between the second maxillary premolar (PM2) and first maxillary molar (M1) of Mongoloids. Methods: Thirty-two digital orthopantomograms of Mongoloids were selected and the interdental distance between the second premolar and first molar at 2, 5, 8 and 11 mm from the cemento-enamel junction (CEJ) was measured. The distance between the PM2 and M1 root apices and from the apices to the maxillary sinus was also determined. Results: The average width (mm) at 2 mm was 2.58 +/- 0.53; 5 mm was 3.47 +/- 0.61; 8 mm was 4.00 +/- 0.74, 11 mm was 4.36 +/- 0.71 and the distance between the apices was 7.49 +/- 0.79. Only half of the samples were measured at 11 mm, as many of the root apices were superimposed over the maxillary sinus. The measurement (mm) from PM2 root apex to the sinus was -0.18 +/- 1.56, from the mesiobuccal root apex of M1 ((MB) to the sinus was -1.94 +/- 1.70 and from the midpoint between their apices to the sinus was -2.96 +/- 2.06 (superimposed on the sinus). Conclusion: The safest area to place mini-implants between the second premolar and the first molar in the maxilla of Mongoloids is between 5 to 8 mm above the CEJ. (Aust Orthod J 2012; 1,7-21)

Item Type: Article
Additional Information: ISI Document Delivery No.: 954VX Times Cited: 0 Cited Reference Count: 15 Cited References: Carano Aldo, 2004, Prog Orthod, V5, P212 Cope JB, 2005, SEMIN ORTHOD, V11, P3, DOI 10.1053/j.sodo.2004.11.002 Deguchi T, 2006, AM J ORTHOD DENTOFAC, V129, P721 HEINS PJ, 1986, J DENT RES, V65, P948, DOI 10.1177/00220345860650061901 Ishii Takenobu, 2004, Bull Tokyo Dent Coll, V45, P165, DOI 10.2209/tdcpublication.45.165 Kim SH, 2009, AM J ORTHOD DENTOFAC, V136, p628e1 Kim SH, 2007, AM J ORTHOD DENTOFAC, V131, pS82, DOI 10.1016/j.ajodo.2006.01.027 Kitai Noriyuki, 2002, Int J Adult Orthodon Orthognath Surg, V17, P264 Kravitz ND, 2007, AM J ORTHOD DENTOFAC, V131, pS43, DOI 10.1016/j.ajodo.2006.04.027 LAVELLE CLB, 1972, AMER J ORTHODONTICS, V61, P29, DOI 10.1016/0002-9416(72)90173-X Madrigal C, 2008, MED ORAL PATOL ORAL, V13, pE307 Ohnishi H, 2005, ANGLE ORTHOD, V75, P444 Park HS, 2002, KOREAN J ORTHOD, V32, P435 Poggio PM, 2006, ANGLE ORTHOD, V76, P191 Schnelle MA, 2004, ANGLE ORTHOD, V74, P832 Wey, Mang Chek Shim, Chung Nam Lee, Meng Yit Jamaluddin, Marhazlinda Ngeow, Wei Cheong Australian soc orthodontists inc Castlemaine
Uncontrolled Keywords: Beam computed-tomography miniscrews bone
Subjects: R Medicine > RK Dentistry
Divisions: Faculty of Dentistry > Dept of Children’s Dentistry And Orthodontics
Depositing User: Mr Ahmad Azwan Azman
Date Deposited: 04 Dec 2012 02:55
Last Modified: 27 Sep 2019 08:52

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