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Protraction of mandibular second and third molars into missing first molar spaces for a patient with an anterior open bite and anterior spacing

Title
Protraction of mandibular second and third molars into missing first molar spaces for a patient with an anterior open bite and anterior spacing
Authors
Baik U.-B.Chun Y.-S.Jung M.-H.Sugawara J.
Ewha Authors
전윤식
SCOPUS Author ID
전윤식scopus
Issue Date
2012
Journal Title
American Journal of Orthodontics and Dentofacial Orthopedics
ISSN
0889-5406JCR Link
Citation
vol. 141, no. 6, pp. 783 - 795
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
In a young woman, aged 18 years 8 months, who had an anterior open bite and anterior spacing, the right and left mandibular first molar extraction spaces were closed by protraction of the second and third molars without reciprocal retraction of the incisors and the premolars. The amounts of protraction for the second molars were 12 mm on the right side and 11 mm on the left side. Two miniscrews were inserted into the mesiobuccal side of the edentulous spaces, and 2 more screws were inserted into the anterior sites after removing previous miniscrews. In addition, 4 miniscrews were inserted into the buccal and palatal sides between the first and second maxillary molars to intrude the maxillary posterior teeth, which had extruded into the missing mandibular spaces. Careful biomechanical consideration was used to prevent extrusion of the molars and worsening of the anterior open bite from protraction of the posterior teeth. Ultimately, the anterior open bite was corrected by both intrusion of the maxillary molars and extrusion of the maxillary anterior teeth. Excellent occlusion and correction of the anterior open bite were achieved without tipping, rotation of the posterior teeth, or other problems. The right mandibular third molar, which had been impacted at the beginning of treatment, erupted into the second molar space and functioned properly. At the 1-year follow-up examination, the patient had a slight anterior open bite, but closure of the first molar extraction spaces was well maintained. © 2012 by the American Association of Orthodontists.
DOI
10.1016/j.ajodo.2010.07.031
Appears in Collections:
의학전문대학원 > 의학과 > Journal papers
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