Effect Evaluation Of Cephalometric Measurement Of Pre- And Post-tooth Extraction Orthodontic Treatment In Skeletal Class â…¡~1 Malocclusion In Zhuhai Adults

Objective: By means of measuring and analyzing the scull lateral radiograph of Zhuhai adults’ Angle class II1 malocclusion pre- and post- treatments, to summarize the feature of adults’ Angle II1 in Zhuhai, providing references for patient correction plan, therapy and prognosis evaluation. Methods: The 44 standard based Angle II1 patients(18 male and 26 female: with average age of 20.75±2.36 year-old, under average 27.70±3.75 months course of treatment), were picked from the base of patients who had registered in The Fifth Affiliated Hospital of Zunyi Medical University from July 2011 to October 2015. Scull lateral radiograph of all patients before and after cutting were analyzed through AngleCeph 8.0, measured via McNamara and Steiner. 24 sets of measuring data of soft and hard tissues were exported. Qualitative data checked with t-test, and compared with common occlusal of Cantonese and Chinese respectively. Eventually selected statistically significant(P<0.05)for the indicators, comprehensively analyzed the comparison results and summarized the features. Results: 1.(Zhuhai V.S. Cantonese) Before Treatment: Features about bone tissues: Gender difference was not significant. The clinical type II skeletal facial profile showed: ANB angle, UI-NA&GoGN-SN angles were bigger(P < 0.05); SNB angle, SND angle,UI-LI angle, SL space & SE space were smaller(P <0.05). 2.(Zhuhai V.S. Cantonese) After Treatment: UI-LI, GoGN-SN angles for both male & female were bigger(P<0.05). The ANB angle for female was bigger(P<0.05), but normal for male. SNA angle, SNB angle, SND angle, UI-LI angle, SL space & SE space were smaller(P<0.05). 3.(Zhuhai V.S. Chinese) Before Treatment: ANB angle, UI-NA angle, Ls-EP space, Li-EP space and SE space were bigger(P<0.05). SNB angle, SND angle, Pg-NB space, UI-LI angle and SL space were smaller(P<0.05). 4.(Zhuhai V.S. Chinese) After Treatment: ANB angle, OP-SN angle, UI-LI angle, Ls-EP space, Li-EP space and SE space were bigger(P<0.05); SNB angle, SND angle, UI-NA angle, UI-NA space, Pg-NB space and SL space were smaller(P<0.05). 5.(Before V.S. After) Zhuhai: Co-Gn space, UI-LI angle increased(P<0.05). ANS-Me space, OP-SN angle enlarged. A-Np space, UI-AP space, LI-A-Pog space, SNA angle, ANB angle, UI-NA space, UI-NA angle, Ls-EP space and Li-EP space were all signally decreased(P<0.05). Conclusion: 1. The studied object’s occlusion was failed to reach the standard level of common Cantonese & Chinese after the orthodontic treatment by tooth extraction. But the condition of soft & hard tissues had improved significantly, which met the purposes of covering. 2. Statistically significant of the indicators(Refer to the attached picture) collected from the pre- and post-treatment had offered references of making therapeutic plans & doing prognosis evaluation. 3. The clinical symptom & pathogenesis of Zhuhai Adults’ skeletal Angle II1 patient were similar to those of Cantonese patients. Suggest Cephalometric analysis were set based on normal values of Chinese & Cantonese occlusion.