CAJ | 학술논문

目的探讨在骨性Ⅲ类错(牙合)正畸-正颌联合治疗的术前正畸中改良骨皮质切开术(improved corticotomy,IC)对牙根周围牙槽骨厚度和牙根长度的影响.方法将接受IC的12例骨性Ⅲ类错(牙合)正畸-正颌联合治疗患者的72颗牙齿纳入研究,采用锥形束CT结构重叠法,测量上颌牙列排齐整平后(T1)和上颌牙列间隙关闭后(T2)锥形束CT上颌前牙根尖水平的唇侧、腭侧牙槽骨厚度和总厚度以及牙根长度,采用配对t检验比较两个时间点的差异;按照Sharpe分级,判断牙根吸收程度.结果上颌中切牙、侧切牙和尖牙根尖水平的唇侧牙槽骨厚度分别由T1的(2.32±0.71)、(1.89±0.83)和(2.28±1.08) mm增加到T2的(2.68±1.48)、(2.47±1.02)和(2.41±1.40) mm,其中侧切牙唇侧牙槽骨厚度两时间点差异有统计学意义(P＜0.05).根据Sharpe分级,12例患者72颗牙齿中69颗牙根吸收为1级,2颗为2级,1颗为3级.结论对于本组前牙移动量较大的减数患者,IC使其唇侧牙槽骨骨量有增加趋势,且绝大多数牙齿的牙根吸收为Sharpe分级的1级.
목적 탐토재골성Ⅲ류착(아합)정기-정합연합치료적술전정기중개량골피질절개술(improved corticotomy,IC)대아근주위아조골후도화아근장도적영향.방법장접수IC적12례골성Ⅲ류착(아합)정기-정합연합치료환자적72과아치납입연구,채용추형속CT결구중첩법,측량상합아렬배제정평후(T1)화상합아렬간극관폐후(T2)추형속CT상합전아근첨수평적진측、악측아조골후도화총후도이급아근장도,채용배대t검험비교량개시간점적차이;안조Sharpe분급,판단아근흡수정도.결과상합중절아、측절아화첨아근첨수평적진측아조골후도분별유T1적(2.32±0.71)、(1.89±0.83)화(2.28±1.08) mm증가도T2적(2.68±1.48)、(2.47±1.02)화(2.41±1.40) mm,기중측절아진측아조골후도량시간점차이유통계학의의(P＜0.05).근거Sharpe분급,12례환자72과아치중69과아근흡수위1급,2과위2급,1과위3급.결론대우본조전아이동량교대적감수환자,IC사기진측아조골골량유증가추세,차절대다수아치적아근흡수위Sharpe분급적1급.
Objective To evaluate the alveolar bone thickness and root length changes of anterior teeth with cone-beam computed tomography(CBCT).Methods CBCT scans were taken for 12 skeletal Class Ⅲ patients who accepted the improved corticotomy(IC) procedures during pre-surgical orthodontics.The CBCT data in T1(the maxillary dental arch was aligned and leveled) and T2(extraction space closure) were superimposed and the alveolar bone thickness at root apex level and root length measurements were done.Results From T1 to T2,the buccal alveolar bone thickness for the upper lateral incisors increased from (1.89±0.83) to (2.47± 1.02) mm (P＜0.05),and for central incisors and for canines from (2.32±0.71) to (2.68 ± 1.48) mm and from (2.28 ± 1.08) to (2.41 ± 1.40) mm,respectively.According to Sharpe Grading System,the root resorption grade for 69 teeth of 72 was located in Grade 1,two teeth in Grade 2,one tooth in Grade 3.Conclusions The improved corticotomy had the potential to increase the buccal alveolar bone thickness and the root resorption in most teeth was in Grade 1 according to Sharpe grading system.