摘要
目的分析混合牙列期矫治的II类错牙合,在下颌切牙明显前移后是否会继发牙龈退缩。方法将67名II类错牙合病人治疗前后的X线头颅侧位片的下颌部位叠加,发现其中45例病人的釉牙骨质界最小前移量为1mm,切缘最小前移量为2mm。对照组为同期30例II类错牙合病人,但经过治疗后釉牙骨质界未前移,下颌切牙切缘最大前移量为1mm。分别在治疗后7.83年和9.38年随访其中明显前移组病人30例,未前移对照组病人21例。通过X线头颅侧位片、研究模型,并结合临床检查分析下切牙牙周组织状态。结果在下切牙牙龈退缩程度、附着龈宽度、嵴上连接组织附着高度、牙周袋深度、牙龈出血指数、可视菌斑指数等方面均无组间差异。从治疗前到治疗后,从治疗后到随访复查的两个时段内发生牙龈退缩的下切牙数目、下切牙临床冠高度的增加量也未见组间差异。结论伴有牙槽后缩的青春期病人,在治疗时可使下切牙明显前移而不加大牙龈退缩的危险。
Objective To analyze whether pronounced orthodontic advancement of the mandibular incisors during Class Ⅱcorrection in the mixed dentition results in gingival recession.Methods Through mandibular superimposition of the pretreatment and posttreatment cephalograms of 67 Class Ⅱpatients who were treated,45patients with a minimum of a 1-mm advancement of the CEJ and a minimum of a 2-mm advancement of the IE were identified .Using the same protocol in Class Ⅱpatients,30 individuals who finished treatment at a similar time and age ,but with no advancement of the CEJ and a maximum of 1-mm advancement of the IE were identified. A total of 30 patients with pronounced advancement and 21 patients with no advancement could meet for a follow-up examination with a mean period of 7.83 years and 9.38 years after treatment, respectively .Through measuring cephalograms,study models,as well as clinical examinations to analyze the periodontal status of mandibular incisors. Results Clinical examinations at the time of follow-up revealed no differences in the amount of recession ,the width of attached gingiva,the length of supracrestal connective tissue attachment ,the probing pocket depth, gingival bleeding index or visible plaque index of the mandibular incisors between the patients in the 2 groups. No differences in the number of mandibular incisors that developed recession from T1 to T2 and from T2 to T3.The increase of mandibular incisor crown height demonstrated no difference from T2 to T3 between the patients in the 2 groups.Conclusion Pronounced advancement of the mandibular incisors may be performed in adolescent patients with dentoalveolar retrusion without increasing the risk of recession .
出处
《上海口腔医学》
CAS
CSCD
2002年第4期297-299,共3页
Shanghai Journal of Stomatology
基金
山东省科学技术厅基金(022130126)
