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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,正畸治疗时牙齿移动引起的骨开裂,36、如果我们国家的法律中只有某种神灵，而不是殚精竭虑将神灵揉进宪法，总体上来说，法律就会更好。马克吐温,37、纲纪废弃之日，便是暴政兴起之时。威皮物特,38、若是没有公众舆论的支持，法律是丝毫没有力量的。菲力普斯,39、一个判例造出另一个判例，它们迅速累聚，进而变成法律。朱尼厄斯,40、人类法律，事物有规律，这是不容忽视的。爱献生,正畸治疗时牙齿移动引起的骨开裂正畸治疗时牙齿移动引起的骨开裂36、如果我们国家的法律中只有某种神灵，而不是殚精竭虑将神灵揉进宪法，总体上来说，法律就会更好。马克吐温,37、纲纪废弃之日，便是暴政兴起之时。威皮物特,38、若是没有公众舆论的支持，法律是丝毫没有力量的。菲力普斯,39、一个判例造出另一个判例，它们迅速累聚，进而变成法律。朱尼厄斯,40、人类法律，事物有规律，这是不容忽视的。爱献生The phenomenon of bone dehiscencesDefinition,anterior tooth movement exceeds bony apposition can lead to resorption of the cortical bone and exposure of the root,High-risk population,mandible&maxilla protrusion,expansion of the maxillary arch Example 1Location of bone-thickness measurements before and after retraction,S3,Example 2,rotated canines and crowding of the incisors are found in the pretherapeutic mandibular situation,corresponding pretreatment CT examination：3D-reconstruction,narrow frontal mandibular alveolarprocess with thin facial bone plates,Clinical situation after two years of orthodontic treatment,Corresponding CT examination：3D-reconstruction,extensive facial dehiscences above the roots of the incisors and canines,Dental anatomy,Alveolar bone proper,Supporting alveolar bone,Cortical plate,Spongy bone,bone traces tooth movement?,A basic axiom in orthodontics is whenever orthodontic tooth movement occurs,bone around the alveolar socket will remodel to the same extent,The truth is,In the vertical dimension:,during orthodontic tooth extrusion,bone increase is usually less than the dental displacement,leading to an increase in the clinical crown.,In the transverse dimension:,bone remodeling/tooth movement ratio of tooth retraction with tip and with torque is 1:2 and 1:2.35 respectively,Repair of the perforation site,bone dehiscences were partly repaired in the retention period,but it was insufficient to cover the root completely,Repair of the perforation site will lead to relapse of the teeth,conclusion,retraction of the incisors is limited,forcing the tooth against the cortical bone may cause adverse sequelae,surgical orthodontic treatment should be taked when tooth movement exceed“bone wall”,anterior maxillary subapical osteotomy,initial examination,before surgery：,maxillary first premolars and left mandibular central incisor were extracted.All residual third molars were also extracted,after surgery：,anterior maxillary dentoalveolar segment repositioned 4mm posteriorly and 3.5 mm upward.,after 2 years of retention：,reference,Alexander D.,Vardimon,Eyal,Oren.Cortical bone remodeling/tooth movement ratio during maxillary incisor retraction with tip versus torque movements.American Journal of Orthodontics and,Dentofacial,Orthopedics,Volume 114,Number 5,Simten,Sarikaya,Bulent,Haydar,.Changes in alveolar bone thickness due to retraction of anterior teeth.American Journal of Orthodontics and,Dentofacial,Orthopedics.July 2019,Heinrich,Wehrbein,Priv,Doz,Dr med.Human,histologic,tissue response after long-term orthodontic tooth movement.American Journal of Orthodontics and,Dentofacial,Orthopedics,Volume 107,No.4,Javad,Hazrati,Marangalou,Farzan,Ghalichi,.Numerical simulation of orthodontic bone remodeling.orthodontic waves.(2009):64-71,Manabu Miyamoto,Takashi,Yamashiro,.Surgical orthodontic treatment for severe maxillary protrusion with aggressive,periodontitis,.orthodontic waves.(2019):171-178,Thank you!,1,、最灵繁的人也看不见自己的背脊。,非洲,2,、最困难的事情就是认识自己。,希腊,3,、有勇气承担命运这才是英雄好汉。,黑塞,4,、与肝胆人共事，无字句处读书。,周恩来,5,、阅读使人充实，会谈使人敏捷，写作使人精确。,培根,
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