"Safe zones" for miniscrew implant placement in different dentoskeletal patterns.
OBJECTIVE
To assess the influence of different dentoskeletal patterns on the availability of interradicular spaces and to determine the safe zones for miniscrew implant placement.


METHODS
Periapical radiographs of 60 subjects with skeletal Class I, II, or III patterns were examined. For each interradicular site, the areas and distances at 3, 5, 7, 9, and 11 mm from the alveolar crest were measured.


RESULTS
In the maxilla, the greatest interradicular space was between the second premolar and the first molar. In the mandible, the greatest interradicular space was between the first and second molars, followed by the first and second premolars. Significant differences in interradicular spaces among the skeletal patterns were observed. Maxillary interradicular spaces, particularly between the first and second molars, in the subjects with skeletal Class II patterns, were greater than those in the subjects with skeletal Class III patterns. In contrast, in the mandible, interradicular spaces in the subjects with skeletal Class III patterns were greater than those in the subjects with skeletal Class II patterns.


CONCLUSIONS
For all skeletal patterns, the safest zones were the spaces between the second premolar and the first molar in the maxilla, and between the first and second premolars and between the first and second molars in the mandible.
Department of Orthodontics and Pediatric Dentistry, Faculty of Dentistry, Chiang Mai University, Amphur Muang, Chiang Mai, Thailand.
Pajongjit
P
Chaimanee
Boonsiva
B
Suzuki
Eduardo Yugo
EY
Suzuki
D000222:Adaptation, Physiological; D000293:Adolescent; D000328:Adult; D000539:Alveolar Process / Q000000981:diagnostic imaging / Q000473:pathology*; D000704:Analysis of Variance; D001641:Bicuspid / Q000000981:diagnostic imaging; D001863:Bone Screws; D016022:Case-Control Studies; D002508:Cephalometry; D003758:Dental Implantation, Endosseous / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000473:pathology*; D008313:Malocclusion, Angle Class III / Q000473:pathology*; D008963:Molar / Q000000981:diagnostic imaging; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D011859:Radiography; D018709:Statistics, Nonparametric; D014092:Tooth Root / Q000000981:diagnostic imaging; D055815:Young Adult
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