CAJ | 학술논문

目的：应用锥体束CT（CBCT）观察磁力扩大上颌牙弓后后牙牙根的吸收情况。方法选取采用磁力扩弓矫治器进行上颌扩弓的32例患者，拍摄扩弓前后CBCT，测量上颌后牙牙根长度，采用配对t检验分析扩弓前后牙根长度的变化，采用成组t检验分析不同发育阶段的牙根长度的差异。结果磁力扩弓后，支抗牙较非支抗牙更易出现牙根吸收。根尖孔已闭合组（G2组）上颌后牙牙根长度有减少的趋势，第一磨牙近中颊根长度减少，第一前磨牙颊根减少。根尖孔未闭合组（G1组）后牙牙根未见吸收。结论磁力扩弓对支抗牙的牙根长度有影响。G1组的支抗牙对于矫形力的耐受强于G2组。早期进行扩弓治疗可能降低牙根吸收的风险。
목적： 응용추체속CT（CBCT）관찰자력확대상합아궁후후아아근적흡수정황。방법 선취채용자력확궁교치기진행상합확궁적32례환자，박섭확궁전후CBCT，측량상합후아아근장도，채용배대t검험분석확궁전후아근장도적변화，채용성조t검험분석불동발육계단적아근장도적차이。결과 자력확궁후，지항아교비지항아경역출현아근흡수。근첨공이폐합조（G2조）상합후아아근장도유감소적추세，제일마아근중협근장도감소，제일전마아협근감소。근첨공미폐합조（G1조）후아아근미견흡수。결론 자력확궁대지항아적아근장도유영향。G1조적지항아대우교형력적내수강우G2조。조기진행확궁치료가능강저아근흡수적풍험。
Objective To investigate the root length of posterior teeth after palatal expansion by magnetic expansion ap-pliance. Methods A total of 32 patients who accepted palatal expansion with magnetic expansion appliance were enrolled in the study. Pretreatment and post-treatment cone-beam computed tomography (CBCT) images were obtained. A paired t test was used to evaluate the length change, and a group t test was used to compare the tooth lengths of developing and developed teeth. Results Anchorage teeth showed greater root resorption than non-anchorage teeth, whereas the developed posterior teeth showed reduced resorption. Moreover, the mesial buccal roots of the first molar and first premolar were reduced. No resorption was found in the developing teeth group. Conclusion The magnetic palatal expansion can reduce the root length, particularly of developed root. The developing root of anchorage teeth show greater tolerance to resorption than the developed root. Early palatal expansion treatment with magnetic expansion appliance can reduce the risk of root resorption.