The aim of this retrospective study was to quantitatively evaluate the treatment effects of in- trusion of overerupted maxillary molars using miniscrew implant anchorage and to investigate the apical root resorption a...The aim of this retrospective study was to quantitatively evaluate the treatment effects of in- trusion of overerupted maxillary molars using miniscrew implant anchorage and to investigate the apical root resorption after molar intrusion. The subjects included 30 patients whose average ages were 35.5±9.0 years. All patients had received intrusion treatments for overerupted maxillary molars with miniscrew anchorage. There were 38 maxillary first molars and 26 maxillary second molars to be in- truded. Two miniscrews were inserted in the buccal and palatal alveolar bone mesial to the overerupted molar. Force of 100-150 g was applied by the elastic chains between screw head and attachment on each side. Lateral cephalograms and panoramic radiographs taken before and after intrusion were used to evaluate dental changes and root resorption of molars. Only 6 of the 128 miniscrews failed. The first and second molars were significantly intruded by averages of 3.4 mm and 3.1 mm respectively （P〈0.001）. The average intrusion time was more than 6 months. The crown of the molars mesially tilted by averages of 3.1 degrees and 3.3 degrees （P〈0.001） for first and second molars. The amounts of root resorption were 0.2-0.4 mm on average. The intrusion treatment of overerupted molars with miniscrew anchorages could be used as an efficient and reliable method to recover lost restoration space for pros- thesis. Radiographically speaking, root resorption of molars was not clinically significant after applica- tion of intrusive forces of 200 to 300 g.展开更多
This article reports a case in which a horizontally impacted wisdom tooth was orthodontically uprighted to replace a missing molar.Through mandibular single-arch treatment utilizing a long-arm buccal tube,uprighting a...This article reports a case in which a horizontally impacted wisdom tooth was orthodontically uprighted to replace a missing molar.Through mandibular single-arch treatment utilizing a long-arm buccal tube,uprighting auxiliary spring,and miniscrew implant,the impacted wisdom tooth was successfully uprighted and mesialized to substitute for the missing molar,effectively re-storing occlusal function in the edentulous area.Written informed consent was obtained from the patient,and the treatment protocol was approved by the institutional ethics committee.展开更多
文摘The aim of this retrospective study was to quantitatively evaluate the treatment effects of in- trusion of overerupted maxillary molars using miniscrew implant anchorage and to investigate the apical root resorption after molar intrusion. The subjects included 30 patients whose average ages were 35.5±9.0 years. All patients had received intrusion treatments for overerupted maxillary molars with miniscrew anchorage. There were 38 maxillary first molars and 26 maxillary second molars to be in- truded. Two miniscrews were inserted in the buccal and palatal alveolar bone mesial to the overerupted molar. Force of 100-150 g was applied by the elastic chains between screw head and attachment on each side. Lateral cephalograms and panoramic radiographs taken before and after intrusion were used to evaluate dental changes and root resorption of molars. Only 6 of the 128 miniscrews failed. The first and second molars were significantly intruded by averages of 3.4 mm and 3.1 mm respectively （P〈0.001）. The average intrusion time was more than 6 months. The crown of the molars mesially tilted by averages of 3.1 degrees and 3.3 degrees （P〈0.001） for first and second molars. The amounts of root resorption were 0.2-0.4 mm on average. The intrusion treatment of overerupted molars with miniscrew anchorages could be used as an efficient and reliable method to recover lost restoration space for pros- thesis. Radiographically speaking, root resorption of molars was not clinically significant after applica- tion of intrusive forces of 200 to 300 g.
基金supported by Guangxi Medical and Health Appropriate Technology Development and Application Project(No.S2022153)Guangxi Zhuang Autonomous Region Health Commission self-funded research project(No.Z-C20231971)+1 种基金Project to improve basic research ability of young and middle-aged teachers in Guangxi colleges and universities(No.2024KY0499)Guilin Science Research and Technology Development Program(No.20230135-5-1).
文摘This article reports a case in which a horizontally impacted wisdom tooth was orthodontically uprighted to replace a missing molar.Through mandibular single-arch treatment utilizing a long-arm buccal tube,uprighting auxiliary spring,and miniscrew implant,the impacted wisdom tooth was successfully uprighted and mesialized to substitute for the missing molar,effectively re-storing occlusal function in the edentulous area.Written informed consent was obtained from the patient,and the treatment protocol was approved by the institutional ethics committee.
