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Craniofacial morphology in growing patients with oligodontia
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orthodontic waves 72 (2013) 36–41
These results suggest that the normal group pronounces normally and that F1/F0 4 and F2/F0 4 in this group can be criteria for acoustic analysis. The articulation point of the consonant / R / is forward in the MFT group. Tongue-thrust swallowing habits can affect the horizontal tongue posture. After orthognathic surgery, the horizontal tongue position at speech was improved.
http://dx.doi.org/10.1016/j.odw.2013.01.035
1 Maxillofacial Orthognathics, Department of Maxillofacial Neck Reconstruction, Division of Maxillofacial Reconstruction and Function, Graduate School, Tokyo Medical and Dental University, Japan 2 Global Center of Excellence (GCOE) Program, International Research Center for Molecular Science in Tooth and Bone Disease, Tokyo Medical and Dental University, Japan 3 Hard Tissue Genome Research Center, Tokyo Medical and Dental University, Japan 4 Division of Dentistry, Department of Surgical Subspecialties, National Center for Child Health and Development, Japan Orthod Waves-Jpn Ed 2012; 71(3): 187-193
Original article Influences of abnormal root shape and the amount of tooth movement on the prevalence of root resorption in open bite Akiko Terao, Masahide Motokawa, Masato Kaku, Toshitsugu Kawata, Tomoko Sasamoto, Noritsugu Ozaki, Yayoi Matsuda, Kazuo Tanne Department of Orthodontic and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, Japan Orthod Waves-Jpn Ed 2012; 71(3): 178–186 Recently, many reports have been made about severe root resorption in open-bite cases during orthodontic treatment. However, no information is available for the association of the prevalence of root resorption with root shape in open-bite cases. The purposes of the this study were to clarify the prevalence and degree of root resorption immediately after orthodontic treatment and to investigate the association with root shape and the amount of tooth movement in patients with normal and open bites. Seventy-five patients treated with multibracket appliances were divided into normal- and open-bite groups. The normal-bite group comprised 49 patients and the open-bite 26. The root shape before treatment and the severity of root resorption after treatment were classified according to Malmgren and coauthors. Next, positional changes of the maxillary and mandibular central incisors before and after treatment and its association with root resorption were evaluated. Prevalences of abnormal root shape and root resorption were significantly higher in the open-bite group than in the controls. In the open-bite group, the amounts of lingual movement and extrusion of the maxillary central incisors were significantly greater than in the controls and exhibited a close association with high prevalence of root resorption. From these results, open-bite patients are shown to be involved with a higher risk of root resorption because of abnormal root shapes and greater amounts of tooth movement.
http://dx.doi.org/10.1016/j.odw.2013.01.036
Original article Craniofacial morphology in growing patients with oligodontia Kazuhisa Mogi 1, Takuya Ogawa 123, Yoshiyuki Baba 14, Keiji Moriyama 123
Tooth agenesis, i.e., the congenital absence of teeth, is a common anomaly of human dentition that compromises facial aesthetics and mastication. Oligodontia, defined as the congenital absence of 6 or more permanent teeth (excluding the third molars), causes unavoidable dental consequences, including malocclusion. Because treatment options for this condition are extremely limited, therapy is complicated and lengthy. In this study, we examined 14 children with oligodontia (5 boys, 9 girls; ages 8.3-12.9 years; mean age, 10.0 years) to identify characteristic features in the patterns of missing teeth and craniofacial morphology. The most frequently missing teeth were the maxillary second premolars, followed by the mandibular second premolars, maxillary first premolars, and mandibular first premolars. In contrast, the central incisors, canines, first molars, and mandibular second molars were rarely missing. Cephalometric measurements showed maxillary retrognathism and mandibular prognathism with upward-rotated mandibular plane and anterior short face, which represented a skeletal Class III tendency. Furthermore, the upper first molars were most frequently located low and anterior compared with those of control. These results suggest that treatment of oligodontia should include raising the bite by eruption of the upper molar and downward rotation of the mandible because of the craniofacial morphology of children with growing oligodontia.
http://dx.doi.org/10.1016/j.odw.2013.01.037
Clinical hint Amount of arch length discrepancy resulting from the curve of Spee Yasuko Kageyama, Jiro Otsuru, Yohei Usui, Toru Kageyama, Kazuhiro Yamada Department of Orthodontics, Matsumoto Dental University, Japan Orthod Waves-Jpn Ed 2012; 71(3): 194–198 In orthodontic diagnosis, an accurate assessment of the amount of discrepancy is necessary to flatten the curve of Spee (CS). This discrepancy could be calculated by a formula for changing from the arc to the straight line on the hypothesis that the CS consists of an arc. We have proposed a chart to estimate the discrepancy because of this formula. This chart may clarify this discrepancy easily and quickly.
http://dx.doi.org/10.1016/j.odw.2013.01.038
orthodontic waves 72 (2013) 36–41
These results suggest that the normal group pronounces normally and that F1/F0 4 and F2/F0 4 in this group can be criteria for acoustic analysis. The articulation point of the consonant / R / is forward in the MFT group. Tongue-thrust swallowing habits can affect the horizontal tongue posture. After orthognathic surgery, the horizontal tongue position at speech was improved.
http://dx.doi.org/10.1016/j.odw.2013.01.035
1 Maxillofacial Orthognathics, Department of Maxillofacial Neck Reconstruction, Division of Maxillofacial Reconstruction and Function, Graduate School, Tokyo Medical and Dental University, Japan 2 Global Center of Excellence (GCOE) Program, International Research Center for Molecular Science in Tooth and Bone Disease, Tokyo Medical and Dental University, Japan 3 Hard Tissue Genome Research Center, Tokyo Medical and Dental University, Japan 4 Division of Dentistry, Department of Surgical Subspecialties, National Center for Child Health and Development, Japan Orthod Waves-Jpn Ed 2012; 71(3): 187-193
Original article Influences of abnormal root shape and the amount of tooth movement on the prevalence of root resorption in open bite Akiko Terao, Masahide Motokawa, Masato Kaku, Toshitsugu Kawata, Tomoko Sasamoto, Noritsugu Ozaki, Yayoi Matsuda, Kazuo Tanne Department of Orthodontic and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, Japan Orthod Waves-Jpn Ed 2012; 71(3): 178–186 Recently, many reports have been made about severe root resorption in open-bite cases during orthodontic treatment. However, no information is available for the association of the prevalence of root resorption with root shape in open-bite cases. The purposes of the this study were to clarify the prevalence and degree of root resorption immediately after orthodontic treatment and to investigate the association with root shape and the amount of tooth movement in patients with normal and open bites. Seventy-five patients treated with multibracket appliances were divided into normal- and open-bite groups. The normal-bite group comprised 49 patients and the open-bite 26. The root shape before treatment and the severity of root resorption after treatment were classified according to Malmgren and coauthors. Next, positional changes of the maxillary and mandibular central incisors before and after treatment and its association with root resorption were evaluated. Prevalences of abnormal root shape and root resorption were significantly higher in the open-bite group than in the controls. In the open-bite group, the amounts of lingual movement and extrusion of the maxillary central incisors were significantly greater than in the controls and exhibited a close association with high prevalence of root resorption. From these results, open-bite patients are shown to be involved with a higher risk of root resorption because of abnormal root shapes and greater amounts of tooth movement.
http://dx.doi.org/10.1016/j.odw.2013.01.036
Original article Craniofacial morphology in growing patients with oligodontia Kazuhisa Mogi 1, Takuya Ogawa 123, Yoshiyuki Baba 14, Keiji Moriyama 123
Tooth agenesis, i.e., the congenital absence of teeth, is a common anomaly of human dentition that compromises facial aesthetics and mastication. Oligodontia, defined as the congenital absence of 6 or more permanent teeth (excluding the third molars), causes unavoidable dental consequences, including malocclusion. Because treatment options for this condition are extremely limited, therapy is complicated and lengthy. In this study, we examined 14 children with oligodontia (5 boys, 9 girls; ages 8.3-12.9 years; mean age, 10.0 years) to identify characteristic features in the patterns of missing teeth and craniofacial morphology. The most frequently missing teeth were the maxillary second premolars, followed by the mandibular second premolars, maxillary first premolars, and mandibular first premolars. In contrast, the central incisors, canines, first molars, and mandibular second molars were rarely missing. Cephalometric measurements showed maxillary retrognathism and mandibular prognathism with upward-rotated mandibular plane and anterior short face, which represented a skeletal Class III tendency. Furthermore, the upper first molars were most frequently located low and anterior compared with those of control. These results suggest that treatment of oligodontia should include raising the bite by eruption of the upper molar and downward rotation of the mandible because of the craniofacial morphology of children with growing oligodontia.
http://dx.doi.org/10.1016/j.odw.2013.01.037
Clinical hint Amount of arch length discrepancy resulting from the curve of Spee Yasuko Kageyama, Jiro Otsuru, Yohei Usui, Toru Kageyama, Kazuhiro Yamada Department of Orthodontics, Matsumoto Dental University, Japan Orthod Waves-Jpn Ed 2012; 71(3): 194–198 In orthodontic diagnosis, an accurate assessment of the amount of discrepancy is necessary to flatten the curve of Spee (CS). This discrepancy could be calculated by a formula for changing from the arc to the straight line on the hypothesis that the CS consists of an arc. We have proposed a chart to estimate the discrepancy because of this formula. This chart may clarify this discrepancy easily and quickly.
http://dx.doi.org/10.1016/j.odw.2013.01.038