Miniscrew insertion sites of infrazygomatic crest and mandibular buccal shelf in different vertical craniofacial patterns: A cone-beam computed tomography study
Matias Murilo, Flores-Mir Carlos, de Almeida Marcio Rodrigues, da Silva Vieira Bruno, de Freitas Karina Maria Salvatore, Nunes Daniela Calabrese, Ferreira Marcos Cezar, Ursi Weber,
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( Matias Murilo ) - Guarulhos University Department of Orthodontics
( Flores-Mir Carlos ) - University of Alberta Faculty of Medicine and Dentistry Department of Orthodontics
( de Almeida Marcio Rodrigues ) - Universidade Norte do Parana School of Dentistry Department of Orthodontics
( da Silva Vieira Bruno ) - Guarulhos University Department of Orthodontics
( de Freitas Karina Maria Salvatore ) - Inga Dental School Department of Orthodontics
( Nunes Daniela Calabrese ) - Guarulhos University Department of Orthodontics
( Ferreira Marcos Cezar ) - Private practice
( Ursi Weber ) - Sao Paulo State University Institute of Science and Technology Department of Social and Pediatric Dentistry
Abstract
Objective: To identify optimal areas for the insertion of extra-alveolar miniscrews into the infrazygomatic crest (IZC) and mandibular buccal shelf (MBS), using cone beam computed tomography (CBCT) imaging in patients with different craniofacial patterns.
Methods: CBCT reconstructions of untreated individuals were used to evaluate the IZC and MBS areas. The participants were divided into three groups, based on the craniofacial pattern, namely, brachyfacial (n = 15; mean age, 23.3 years), mesofacial (n = 15; mean age, 19.24 years), and dolichofacial (n = 15; mean age, 17.79 years). In the IZC, the evaluated areas were at 11, 13, and 15 mm above the buccal cusp tips of the right and left first molars. In the MBS, the evaluated areas were at the projections of the first molars’ distal roots and second molars’ mesial and distal roots, at a 4- and 8-mm distance from the cementoenamel junction. Intergroup comparisons were performed with analysis of variance and the Tukey test.
Results: There was no statistically significant difference in the IZC bone thickness among the groups. For MBS bone availability, some comparisons revealed no difference; meanwhile, other comparisons revealed increased MBS bone thickness in the brachyfacial (first molars distal roots) and dolichofacial (second molars mesial and distal roots) patterns.
Conclusions: There was no significant difference in the IZC bone thickness among the groups. The facial skeletal pattern may affect the availability of ideal bone thickness for the insertion of extra-alveolar miniscrews in the MBS region; however, this variability is unlikely to be clinically meaningful.
키워드
Miniscrew; Cone-beam computed tomography; Skeletal anchorage; Extra-alveolar orthodontic anchorage
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