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A study of oligodontia in orthodontic patients
orthodontic waves 75 (2016) 23–25
Available online at www.sciencedirect.com
ScienceDirect journal homepage: www.elsevier.com/locate/odw
OWJE Abstracts vol. 74 (2015): English abstracts of papers published in Japanese in the Orthodontic Waves—Japanese Edition, Official Journal of the Japanese Orthodontic Society (ISSN 1349-0303) Original article Morphological comparison of maxilloface, tongue posture, and pharyngeal airway before and after the mandibular setback surgery 1,,
1
airway space in the SSRO group and the normal group. This means that the SSRO group has little risk of developing OSAS. http://dx.doi.org/10.1016/j.odw.2016.01.002
2
Ayako Suzuki *, Katsuhiko Saitoh , Makoto Satoh , Kazutaka Kasai 1 1 Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan 2 Division of Sleep Medicine, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Japan Orthod Waves–Jpn Ed 2015;74(1):1–9
In the present study, we reviewed the patients who were diagnosed as skeletal mandibular prognathism who underwent a sagittal split ramus osteotomy (SSRO) comparing the perioperative change of the tongue posture and the pharyngeal airway. Also, we considered it versus a postoperative change by SSRO about maxillofacial morphology of obstructive sleep apnea hypopnea syndrome (OSAS) and the pharyngeal airway. We reviewed 20 patients diagnosed as skeletal mandibular prognathism in our hospital. We compared the lateral cephalogram data of the patients one month before the operation (T1), one month after (T2), and one year after (T3), with 53 students belonging to our university setting as the normal group who displayed nothing abnormal with the maxillofacial, and 21 patients diagnosed as OSAS at the Tsukuba University Hospital. 1. The mandibular of T2 and T3 significantly moved to the rear in comparison with T1 by SSRO. 2. The significant difference was recognized by the pharynx measurement that was in the pharyngeal airway in T1–T2 and T1–T3. 3. An analysis of the maxillofacial morphology, revealed that patients with OSAS showed mandibular retrognathia and long facial types. The pharyngeal airway of the OSAS group was significantly narrower than the normal groups. 4. Although at T1, the pharyngeal airway of the SSRO group was significantly wider than that in the normal group, the pharyngeal airway was not significantly different between the SSRO group and the normal group at T2 and T3. SSRO results in constriction of the pharyngeal airway space. There were no significant differences in the morphology of the
Original article A study of oligodontia in orthodontic patients Hisayo Mayama *, Sachi Miura, Yukio Seino, Hiroyuki Miura Division of Orthodontics, Department of Developmental Oral Health Science, School of Dentistry, Iwate Medical University, Japan Orthod Waves–Jpn Ed 2015;74(1):10–19 We evaluated the incidences, number of congenital missing teeth (CMT), and pattern of occurrence of asymptomatic oligodontia (CMT of more than 6 teeth excluding the third molars), among 2540 patients who visited Iwate Medical University, the Department of Orthodontics, from April 1998 to October 2010. The edentulous area was evaluated with the use of longitudinal panoramic radiographs, dental models, and oral photos. As a result, 24 patients presented with oligodontia; therefore, the incidence was 0.94% among the 2540 patients, 10.6% among 226 patients with CMT, including oligodontia. The total number of CMT was 188, and the mean number was 7.8. Regarding the types of tooth, CMT were noted in the order of the maxillary second premolar, mandibular second premolar, maxillary first premolar areas, and the premolars showed significantly higher incidences. On the other hand, we previously reported that CMT was most frequently noted in the maxillo-mandibular second premolars, followed by the mandibular lateral incisors. Therefore, regarding oligodontia, the present results suggest that missing the lateral incisors decreased, and that of the first premolar increased. Although the maxillary canines are generally regarded as key teeth of tooth morphogenesis (Butler, Dahlberg), the number of missing maxillary canines was higher than missing mandibular canines in this study, suggesting that it is not always in accordance with the theory. Therefore, we consider that the mandibular canines are more appropriate as key teeth than the maxillary canines. http://dx.doi.org/10.1016/j.odw.2016.01.003
Available online at www.sciencedirect.com
ScienceDirect journal homepage: www.elsevier.com/locate/odw
OWJE Abstracts vol. 74 (2015): English abstracts of papers published in Japanese in the Orthodontic Waves—Japanese Edition, Official Journal of the Japanese Orthodontic Society (ISSN 1349-0303) Original article Morphological comparison of maxilloface, tongue posture, and pharyngeal airway before and after the mandibular setback surgery 1,,
1
airway space in the SSRO group and the normal group. This means that the SSRO group has little risk of developing OSAS. http://dx.doi.org/10.1016/j.odw.2016.01.002
2
Ayako Suzuki *, Katsuhiko Saitoh , Makoto Satoh , Kazutaka Kasai 1 1 Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan 2 Division of Sleep Medicine, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Japan Orthod Waves–Jpn Ed 2015;74(1):1–9
In the present study, we reviewed the patients who were diagnosed as skeletal mandibular prognathism who underwent a sagittal split ramus osteotomy (SSRO) comparing the perioperative change of the tongue posture and the pharyngeal airway. Also, we considered it versus a postoperative change by SSRO about maxillofacial morphology of obstructive sleep apnea hypopnea syndrome (OSAS) and the pharyngeal airway. We reviewed 20 patients diagnosed as skeletal mandibular prognathism in our hospital. We compared the lateral cephalogram data of the patients one month before the operation (T1), one month after (T2), and one year after (T3), with 53 students belonging to our university setting as the normal group who displayed nothing abnormal with the maxillofacial, and 21 patients diagnosed as OSAS at the Tsukuba University Hospital. 1. The mandibular of T2 and T3 significantly moved to the rear in comparison with T1 by SSRO. 2. The significant difference was recognized by the pharynx measurement that was in the pharyngeal airway in T1–T2 and T1–T3. 3. An analysis of the maxillofacial morphology, revealed that patients with OSAS showed mandibular retrognathia and long facial types. The pharyngeal airway of the OSAS group was significantly narrower than the normal groups. 4. Although at T1, the pharyngeal airway of the SSRO group was significantly wider than that in the normal group, the pharyngeal airway was not significantly different between the SSRO group and the normal group at T2 and T3. SSRO results in constriction of the pharyngeal airway space. There were no significant differences in the morphology of the
Original article A study of oligodontia in orthodontic patients Hisayo Mayama *, Sachi Miura, Yukio Seino, Hiroyuki Miura Division of Orthodontics, Department of Developmental Oral Health Science, School of Dentistry, Iwate Medical University, Japan Orthod Waves–Jpn Ed 2015;74(1):10–19 We evaluated the incidences, number of congenital missing teeth (CMT), and pattern of occurrence of asymptomatic oligodontia (CMT of more than 6 teeth excluding the third molars), among 2540 patients who visited Iwate Medical University, the Department of Orthodontics, from April 1998 to October 2010. The edentulous area was evaluated with the use of longitudinal panoramic radiographs, dental models, and oral photos. As a result, 24 patients presented with oligodontia; therefore, the incidence was 0.94% among the 2540 patients, 10.6% among 226 patients with CMT, including oligodontia. The total number of CMT was 188, and the mean number was 7.8. Regarding the types of tooth, CMT were noted in the order of the maxillary second premolar, mandibular second premolar, maxillary first premolar areas, and the premolars showed significantly higher incidences. On the other hand, we previously reported that CMT was most frequently noted in the maxillo-mandibular second premolars, followed by the mandibular lateral incisors. Therefore, regarding oligodontia, the present results suggest that missing the lateral incisors decreased, and that of the first premolar increased. Although the maxillary canines are generally regarded as key teeth of tooth morphogenesis (Butler, Dahlberg), the number of missing maxillary canines was higher than missing mandibular canines in this study, suggesting that it is not always in accordance with the theory. Therefore, we consider that the mandibular canines are more appropriate as key teeth than the maxillary canines. http://dx.doi.org/10.1016/j.odw.2016.01.003