| Objective:This study was designed to explore the impact of non-extraction treatment of anterior crossbite on cephalometrics and subjective evaluation of facial photographs,aiming at providing a more rational and scientific reference for the future design of therapeutic schemes.Methods: 1.24 patients who met the inclusion criteria were divided into the adult and adolescent groups.12 measure values of lateral cephalometric radiographs from pre and post treatment including 8 skeletal measured values: SNA°,SNB°,ANB°,MP-FH°,Y-Axis,ANS-Me,ANS-Ptm and mandibular length,2 dental measured values: U1-NA° and L1-MP° and 2 soft tissue,measured values:G-Sn-Pog,and Cm-Sn-UL,were compared the difference between pre and post treatment of these subjects.2.The sets of three photographs(one frontal,one three-quarter,and one lateral)from these 24 subjects were treated by Photoshop uniformly,then these photographs' scores were performed on a visual analogue scale(VAS)by 44 laymen.The scores of adult and adolescent groups before and after treatment were analyzed.Results: 1.Compared with pre-treatment,the result of cephalometrics in the adult group:(1)Statistically,the skeletal tissue showed that the increase of the mean values of ANB°,MP-FH°,Y-Axis and ANS-Me were significant(P<0.05),while the changes of SNA°,SNB°,ANS-Ptm and mandibular length were insignificant.(2)In dental tissue,the mean value of U1-NA° was significantly increased(P <0.05),whereas L1-MP° was not.(3)The changes of Cm-Sn-UL were significantly decreased in soft tissue(P<0.05),though there were no significance in G-Sn-Pog;In the adolescent group:(1)The skeletal tissue showed that the changes of SNA°,ANS-Me,ANS-Ptm and mandibular length were significantly increased(P<0.05)while the changes of SNB°,ANB°,MP-FH°,Y-Axis were insignificant.(2)Changes in dental tissue were the same as the adult groups'.(3)The change of G-Sn-Pog and m-Sn-UL were insignificant in the adolescent group.2.Subjective evaluation of facial photographs:(1)The mean values of VAS scores in the adult group was higher than that prior to the treatment,however the difference was not statistically significant.(2)In the adolescent group,the mean values of VAS scores show a statistically significant increase compared with pre-treatment(P<0.05).Conclusion: 1.The sagittal discrepancy can be ameliorated after non-extraction treatment of anterior crossbite in adults,with the changes being dominated by postero-inferior rotation of mandible and labial inclination of upper anterior teeth.2.The results of cephalometrics of the adolescent group are not exactly the same as those of the adult group,which is highly likely due to that the growth and orthodontic treatment have a common effect on the sagittal and vertical changes of the jaw.3.Non-extraction treatment of anterior crossbite can affect the facial appearances effectively in the adolescent group,while the improvements in the adult group are not obvious.4.When therapeutic schemes for the patients of anterior crossbite are being designed,the soft tissue profile and the tooth' compensatory ability and the aesthetic requirements of patients should be taken full account of.Moreover,the factor of growth should be added for adolescents. |
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