[Periodontal status of mandibular incisors after pronounced orthodontic advancement during adolescence].
OBJECTIVE
To analyze whether pronounced orthodontic advancement of the mandibular incisors during Class II correction in the mixed dentition results in gingival recession.


METHODS
Through mandibular superimposition of the pretreatment and posttreatment cephalograms of 67 Class II patients who were treated, 45 patients 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 II patients,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.


CONCLUSIONS
Pronounced advancement of the mandibular incisors may be performed in adolescent patients with dentoalveolar retrusion without increasing the risk of recession.
Department of Stomatology, Shandong University, Jinan 250012, China.
Xiao-yan
XY
Zhang
Dong-xu
DX
Liu
Xu
X
Gao
Xiu-yin
XY
Wang
Ru
R
Xi