title: Mechanical strength of orthodontic infrazygomatic mini-implants.
abstract: Orthodontic anchorages have recently been reinforced by newly developed mini-implants. The aim of the present study was to investigate the mechanical strengths of infrazygomatic mini-implants. We measured the insertion torque and pull-out strength of three brands of infrazygomatic mini-implants (AbsoAnchors, Bioray, and Lomas). All three mini-implants were 2 mm in diameter, and five of each brand were manually driven 6 mm into artificial bone. Significant differences among the brands were investigated with Kruskal-Wallis tests. We found no significant relationship between insertion torque and pull-out strength in any individual brand. Among the three brands of infrazygomatic mini-implants, we found no significant difference in mechanical strength. The design of an infrazygomatic mini-implant may be the most important factor determining its mechanical strength.
authors.affiliation: Graduate Institute of Dental Sciences, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
authors.forename: Chau-Hsiang
authors.initials: CH
authors.lastname: Wang
authors.affiliation: Department of Family Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
authors.forename: Ju-Hui
authors.initials: JH
authors.lastname: Wu
authors.affiliation: Department of Family Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
authors.forename: Kun-Tsung
authors.initials: KT
authors.lastname: Lee
authors.affiliation: Department of Family Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
authors.forename: Kun-Rong
authors.initials: KR
authors.lastname: Hsu
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kaohsiung Medical University Hospital, No. 100, Shih-chuan 1st Road, Kaohsiung, 807, Taiwan.
authors.forename: Huang Chi
authors.initials: HC
authors.lastname: Wang
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kaohsiung Medical University Hospital, No. 100, Shih-chuan 1st Road, Kaohsiung, 807, Taiwan. komschen@gmail.com.
authors.forename: Chun-Ming
authors.initials: CM
authors.lastname: Chen
mesh_terms: D015921:Dental Implants; D003799:Dental Stress Analysis; D008904:Miniaturization; D003765:Models, Dental; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D016382:Orthodontic Appliance Design; D011140:Polyurethanes; D013314:Stress, Mechanical; D013718:Tensile Strength; D019415:Torque; D015050:Zygoma / Q000601:surgery
chemical_list: D015921:Dental Implants; D011140:Polyurethanes