Objective To improve the lunctional occiusion afer orthognathic operation, the contractiiities of masseter, temporalis and digastric muscles were studied before and after surgery. Methods By means of integrated electr...Objective To improve the lunctional occiusion afer orthognathic operation, the contractiiities of masseter, temporalis and digastric muscles were studied before and after surgery. Methods By means of integrated electromyogram (EMG), bioelectric potentials and EMG activities of these 3 muscles were recorded. ResuIts Signilicant decreases in bioelectric potentials and EMG activities belore and after surgery were observed in working muscles. No doflerence was noted in resting muscles. ConcIusion Postoperative malocclusion necessitates postoperative orthodontic treatment.展开更多
BACKGROUND Hemifacial microsomia(HFM)is the second most common craniofacial congenital anomaly following cleft lip and palate.Because of the various phenotypic spectra and the severity of the deformity,a wide range of...BACKGROUND Hemifacial microsomia(HFM)is the second most common craniofacial congenital anomaly following cleft lip and palate.Because of the various phenotypic spectra and the severity of the deformity,a wide range of treatment approaches have been proposed.Recently,the surgery-first approach(SFA)was introduced to treat mild to moderate HFM,and it yielded a balanced facial appearance.The SFA not only promotes rapid improvement in facial aesthetics but also considerably reduces the overall treatment time.CASE SUMMARY A female patient,aged 25 years old,sought orthodontic treatment with the chief complaint of dental and facial asymmetry.After a comprehensive physical examination and imaging analysis were performed,the patient was diagnosed with mild HFM that was primarily attributed to unilateral abnormal development of the maxilla-mandibular.The SFA was carried out to correct the skeletal deformity.The palatal suture was used as the midline of the maxilla in the surgical plan to center the maxilla,and the chin was also properly positioned to obtain a relatively symmetrical facial appearance.Four weeks after the surgery,the patient was referred for postsurgical orthodontics to decompensate the dentition and stabilize the occlusion.After 20 mo of treatment,all orthodontic appliances were removed.The posttreatment photographs of the patient and her smile confirmed good aesthetic and occlusal results.CONCLUSION Mild HFM can be corrected by SFA,which not only promotes rapid improvement in facial aesthetics but also considerably reduces the overall treatment time.展开更多
A simple overview of daily orthodontic practice involves use of brackets, wires and elastomeric modules. However, investigating the underlying effect of orthodontic forces shows various molecular and cellular changes....A simple overview of daily orthodontic practice involves use of brackets, wires and elastomeric modules. However, investigating the underlying effect of orthodontic forces shows various molecular and cellular changes. Also, orthodontics is in close relation with dentofacial orthopedics which involves bone regeneration. In this review current and future applications of stem cells(SCs) in orthodontics and dentofacial orthopedics have been discussed. For craniofacial anomalies, SCs have been applied to regenerate hard tissue(such as treatment of alveolar cleft) and soft tissue(such as treatment of hemifacial macrosomia). Several attempts have been done to reconstruct impaired temporomandibular joint. Also, SCs with or without bone scaffolds and growth factors have been used to regenerate bone following distraction osteogenesis of mandibular bone or maxillary expansion. Current evidence shows that SCs also have potential to be used to regenerate infrabony alveolar defects and move the teeth into regenerated areas. Future application of SCs in orthodontics could involve accelerating tooth movement, regenerating resorbed roots and expanding tooth movement limitations. However, evidence supporting these roles is weak and further studies are required to evaluate the possibility of these ideas.展开更多
BACKGROUND Patient satisfaction with facial appearance at the end of orthodontic camouflage treatment is very important, especially for skeletal malocclusion. This case report highlights the importance of the treatmen...BACKGROUND Patient satisfaction with facial appearance at the end of orthodontic camouflage treatment is very important, especially for skeletal malocclusion. This case report highlights the importance of the treatment plan for a patient initially treated with four-premolar-extraction camouflage, despite indications for orthognathic surgery.CASE SUMMARY A 23-year-old male sought treatment complaining about his unsatisfactory facial appearance. His maxillary first premolars and mandibular second premolars had been extracted, and a fixed appliance had been used to retract his anterior teeth for two years without improvement. He had a convex profile, a gummy smile, lip incompetence, inadequate maxillary incisor inclination, and almost a class I molar relationship. Cephalometric analysis showed severe skeletal class Ⅱ malocclusion(A point-nasion-B point = 11.5°) with a retrognathic mandible(sella-nasion-B point = 75.9°), a protruded maxilla(sella-nasion-A point = 87.4°), and vertical maxillary excess(upper incisor to palatal plane = 33.2 mm). The excessive lingual inclination of the maxillary incisors(upper incisor to nasion-A point line =-5.5°)was due to previous treatment attempts to compensate for the skeletal class Ⅱ malocclusion. The patient was successfully retreated with decompensating orthodontic treatment combined with orthognathic surgery. The maxillary incisors were repositioned and proclined in the alveolar bone, the overjet was increased, and a space was created for orthognathic surgery, including maxillary impaction, anterior maxillary back-setting, and bilateral sagittal split ramus osteotomy to correct his skeletal anteroposterior discrepancy. Gingival display was reduced, and lip competence was restored. In addition, the results remained stable after 2 years. The patient was satisfied with his new profile as well as with the functional malocclusion at the end of treatment.CONCLUSION This case report provides orthodontists a good example of how to treat an adult with severe skeletal class Ⅱ 展开更多
文摘Objective To improve the lunctional occiusion afer orthognathic operation, the contractiiities of masseter, temporalis and digastric muscles were studied before and after surgery. Methods By means of integrated electromyogram (EMG), bioelectric potentials and EMG activities of these 3 muscles were recorded. ResuIts Signilicant decreases in bioelectric potentials and EMG activities belore and after surgery were observed in working muscles. No doflerence was noted in resting muscles. ConcIusion Postoperative malocclusion necessitates postoperative orthodontic treatment.
基金National Natural Science Foundation of China,No.81801005 and No.81870795and Jilin Provincial Development and Reform Commission,No.2018-33-05.
文摘BACKGROUND Hemifacial microsomia(HFM)is the second most common craniofacial congenital anomaly following cleft lip and palate.Because of the various phenotypic spectra and the severity of the deformity,a wide range of treatment approaches have been proposed.Recently,the surgery-first approach(SFA)was introduced to treat mild to moderate HFM,and it yielded a balanced facial appearance.The SFA not only promotes rapid improvement in facial aesthetics but also considerably reduces the overall treatment time.CASE SUMMARY A female patient,aged 25 years old,sought orthodontic treatment with the chief complaint of dental and facial asymmetry.After a comprehensive physical examination and imaging analysis were performed,the patient was diagnosed with mild HFM that was primarily attributed to unilateral abnormal development of the maxilla-mandibular.The SFA was carried out to correct the skeletal deformity.The palatal suture was used as the midline of the maxilla in the surgical plan to center the maxilla,and the chin was also properly positioned to obtain a relatively symmetrical facial appearance.Four weeks after the surgery,the patient was referred for postsurgical orthodontics to decompensate the dentition and stabilize the occlusion.After 20 mo of treatment,all orthodontic appliances were removed.The posttreatment photographs of the patient and her smile confirmed good aesthetic and occlusal results.CONCLUSION Mild HFM can be corrected by SFA,which not only promotes rapid improvement in facial aesthetics but also considerably reduces the overall treatment time.
文摘A simple overview of daily orthodontic practice involves use of brackets, wires and elastomeric modules. However, investigating the underlying effect of orthodontic forces shows various molecular and cellular changes. Also, orthodontics is in close relation with dentofacial orthopedics which involves bone regeneration. In this review current and future applications of stem cells(SCs) in orthodontics and dentofacial orthopedics have been discussed. For craniofacial anomalies, SCs have been applied to regenerate hard tissue(such as treatment of alveolar cleft) and soft tissue(such as treatment of hemifacial macrosomia). Several attempts have been done to reconstruct impaired temporomandibular joint. Also, SCs with or without bone scaffolds and growth factors have been used to regenerate bone following distraction osteogenesis of mandibular bone or maxillary expansion. Current evidence shows that SCs also have potential to be used to regenerate infrabony alveolar defects and move the teeth into regenerated areas. Future application of SCs in orthodontics could involve accelerating tooth movement, regenerating resorbed roots and expanding tooth movement limitations. However, evidence supporting these roles is weak and further studies are required to evaluate the possibility of these ideas.
文摘BACKGROUND Patient satisfaction with facial appearance at the end of orthodontic camouflage treatment is very important, especially for skeletal malocclusion. This case report highlights the importance of the treatment plan for a patient initially treated with four-premolar-extraction camouflage, despite indications for orthognathic surgery.CASE SUMMARY A 23-year-old male sought treatment complaining about his unsatisfactory facial appearance. His maxillary first premolars and mandibular second premolars had been extracted, and a fixed appliance had been used to retract his anterior teeth for two years without improvement. He had a convex profile, a gummy smile, lip incompetence, inadequate maxillary incisor inclination, and almost a class I molar relationship. Cephalometric analysis showed severe skeletal class Ⅱ malocclusion(A point-nasion-B point = 11.5°) with a retrognathic mandible(sella-nasion-B point = 75.9°), a protruded maxilla(sella-nasion-A point = 87.4°), and vertical maxillary excess(upper incisor to palatal plane = 33.2 mm). The excessive lingual inclination of the maxillary incisors(upper incisor to nasion-A point line =-5.5°)was due to previous treatment attempts to compensate for the skeletal class Ⅱ malocclusion. The patient was successfully retreated with decompensating orthodontic treatment combined with orthognathic surgery. The maxillary incisors were repositioned and proclined in the alveolar bone, the overjet was increased, and a space was created for orthognathic surgery, including maxillary impaction, anterior maxillary back-setting, and bilateral sagittal split ramus osteotomy to correct his skeletal anteroposterior discrepancy. Gingival display was reduced, and lip competence was restored. In addition, the results remained stable after 2 years. The patient was satisfied with his new profile as well as with the functional malocclusion at the end of treatment.CONCLUSION This case report provides orthodontists a good example of how to treat an adult with severe skeletal class Ⅱ
