双颌前突中国成人拔牙正畸治疗后唇组织变化预测方法初探

目的：探索并建立双颌前突中国成人拔除4个第一前磨牙正畸治疗后的唇组织改变的预测方法。方法：筛选满足纳入标准的32位双颌前突中国成人患者,在计算机辅助下对其治疗前后头颅侧位片行头影测量分析并行配对t检验,软组织变化的相关分析及逐步多重回归分析。结果：治疗前后水平向唇组织改变有统计学意义而垂直向改变无统计学差异。上唇水平向的位置变化（H—LS）与上切牙颈部的位置变化（H—Pro）正相关,下唇水平向的位置变化（H—Li）与上切牙突点（H—UIP）的位置变化正相关。结论：双颌前突中国成人拔除4个第一前磨牙后正畸治疗的患者,可以通过切牙回收量较好地预测其唇组织水平向的改变。     

Unpredictability of soft tissue changes after camouflage treatment of Class II division 1 malocclusion with maximum anterior retraction using miniscrews

Objective:To compare soft and hard tissue responses based on the degree of maxillary incisor retraction using maximum anchorage in patients with Class II division 1 malocclusion.Materials and Methods:This retrospective study sample was divided into moderate retraction (<8.0 mm; n = 28) and maximum retraction (≥8.0 mm; n = 29) groups based on the amount of maxillary incisor retraction after extraction of the maxillary and mandibular first premolars for camouflage treatment. Pre- and posttreatment lateral cephalograms were analyzed.Results:There were 2.3 mm and 3.0 mm of upper and lower lip retraction, respectively, in the moderate group; and 4.0 mm and 5.3 mm, respectively, in the maximum group. In the moderate group, the upper lip was most influenced by posterior movement of the cervical point of the maxillary incisor (β = 0.94). The lower lip was most influenced by posterior movement of B-point (β = 0.84) and the cervical point of the mandibular incisor (β = 0.83). Prediction was difficult in the maximum group; no variable showed a significant influence on upper lip changes. The lower lip was highly influenced by posterior movement of the cervical point of the maxillary incisor (β = 0.50), but this correlation was weak in the maximum group.Conclusions:Posterior movement of the cervical point of the anterior teeth is necessary for increased lip retraction. However, periodic evaluation of the lip profile is needed during maximum retraction of the anterior teeth because of limitations in predicting soft tissue responses.     

Measurement of three-dimensional perioral soft tissue changes in dentoalveolar protrusion patients after orthodontic treatment using a structured light scanner

Objective:To evaluate the three-dimensional (3D) perioral soft tissue changes after orthodontic treatment in patients with dentoalveolar protrusion using structured light–based scanners.Materials and Methods:Forty-four Korean adults (19 men and 25 women, 21.4 ± 3.4 years) with dentoalveolar protrusion treated by extraction of all four first premolars and then en masse retraction with maximum anchorage were evaluated. Lateral cephalograms and 3D facial scans were obtained before treatment (T1) and immediately after debonding (T2). Superimposition was performed, and 27 perioral landmarks were identified. The 3D changes in the landmarks and ratio of movement of the soft tissue relative to the horizontal incisal tip were evaluated. A paired t-test and one-way analysis of variance were performed.Results:The upper incisors were retracted 5.76 mm and the lower incisors were retracted 4.62 mm (P < .001). The upper lip moved inferoposteriorly, and the lower lip moved superoposteriorly. In the lower lip, upward movement was greater than backward movement (P < .001). The most prominent changes appeared at the greatest bulge area. The relative ratios were 42%–53% in the upper lip area and 22%–82% in the lower lip area. The lip corners moved superoposteriorly (P < .001). Subnasale moved downward (P < .05) and posteriorly (P < .001), while the landmarks under the nostrils moved upward and posteriorly (P < .001).Conclusion:Facial scans from white structured light scanners efficiently evaluated 3D perioral soft tissue in dentoalveolar protrusion patients. Backward movement and significant vertical movement of the lip were observed. The nasal and lip angle areas showed considerable changes.     

Effects of retraction of anterior teeth on horizontal and vertical lip positions in Japanese adults with the bimaxillary dentoalveolar protrusion

The purposes of this study were to evaluate the upper and lower lip changes after orthodontic treatment of bimaxillary protrusion in adult Japanese. We also intended to predict the upper and lower lip positions from the changes of the maxillary and mandibular incisor positions in both the horizontal and vertical planes. Pre-treatment and post-treatment cephalograms of 38 patients (6 males and 32 females, aged 24.2 ± 2.9 and 22.8 ± 4.1 years, respectively) who had four first premolars extracted, were taken with lips in their voluntary relaxed position, traced and compared between them. Stepwise multiple regression analysis revealed that a 1 mm retraction and a 1 mm intrusion of the maxillary incisor cervical point would produce a 0.22 mm retraction of the upper lip, a 1 mm retraction of the mandibular incisor tip would produce 0.76 mm retraction of the lower lip, and a 1 mm mandibular incisor tip retraction would produce a 0.50 mm retraction of Stomion. Moreover, a 1 mm maxillary incisor tip intrusion would produce a 0.56 mm upward movement of the upper lip and a 1.00 mm upward movement of the lower lip. The predictability of this study may be beneficial for orthodontists in planning and discussing treatment plans and options with patients.     

Accuracy of maxillary positioning in bimaxillary surgery

The aim of the study was to investigate the accuracy of a modified pin system for the vertical control of maxillary repositioning in bimaxillary osteotomies. The preoperative cephalograms of 239 consecutive patients who were to have bimaxillary osteotomies were superimposed on the postoperative films. Planned and observed vertical and horizontal movements of the upper incisor were analysed statistically. The mean deviations of −0.07 mm (95% confidence intervals (CIs) −0.17 to 0.04 mm) for the vertical movement and 0.12 mm (95% CI −0.06 to 0.30 mm) for the horizontal movement did not differ significantly from zero. Comparison of the two variances between intrusion and extrusion of the maxilla did not differ significantly either (p = 0.51). These results suggest that the modified pin system for vertical control combined with interocclusal splints provides accurate vertical positioning of the anterior maxilla in orthognathic surgery.     

Bimaxillary surgery in Class III malocclusion: Soft and hard tissue changes

The aim of this study was to quantify anteroposterior facial soft tissue changes with respect to underlying skeletal movements after Le Fort I maxillary advancement and mandibular setback surgery with sagittal split osteotomy in Class III skeletal deformity by using lateral cephalograms taken before and after the operation.The material consisted of 31 patient (15 female, 16 male cases, mean age was 26.7 ± 2.5 years) with Class III skeletal deformity. All patients were treated by Le Fort I maxillary advancement and mandibular setback surgery with sagittal split osteotomy. Lateral cephalograms were taken before and 1.4 ± 0.3 years after surgery. Wilcoxon test was used to compare the pre- and post-surgical measurements. Pearson correlation test was used to compare the relationships between the skeletal, dental and facial soft tissue changes.In the maxilla, the APOINTAP (the anteroposterior position of A point) and ITIPAP (the anteroposterior position of upper incisor) showed significant protractions (?3.19 ± 3.63, and ?3.19 ± 4.52, p < 0.01). In the mandible, the L1TIPAP (the anteroposterior position of lower incisor, ?3.20 ± 5.83, p < 0.01), L1TIPSI (the superoinferior position of lower incisor, ?2.43 ± 10.31, p < 0.05), BPOINTSP (the superoinferior position of B point, ?2.28 ± 12.51, p < 0.05) and BPOINTAP (the anteroposterior position of B point, ?3.19 ± 9.31, p < 0.01) showed significant retractions and upper positions after bimaxillary surgery. The insignificant decrease in soft tissue Pog–Vert distance was correlated the significant upper position of B point and lower incisor (r: 0.851, p < 0.001 and r: 0.842, p < 0.001).     

Effect of large incisor retraction on upper airway morphology in adult bimaxillary protrusion patients: Three-dimensional multislice computed tomography registration evaluation

Objective:To evaluate, using multislice computed tomography (MSCT), the morphologic changes in the upper airway after large incisor retraction in adult bimaxillary protrusion patients.Materials and Methods:Thirty adult patients with bimaxillary protrusion had four first premolars extracted, and then miniscrews were placed to provide anchorage. A CT scan was performed before incisor retraction and again posttreatment. Three-dimensional (3D) reconstruction of the pre- (T1) and post- (T2) CT data was used to assess for morphological changes of the upper airway. A paired t-test was used to compare changes from T1 to T2. The relationship among the three variables (upper incisor retraction amount, upper airway size, and hyoid position) was analyzed by Pearson correlation coefficient.Results:The amounts of upper incisor retraction at the incisal edge and apex were 7.64 ± 1.68 mm and 3.91 ± 2.10 mm, respectively. The hyoid was retracted 2.96 ± 0.54 mm and 9.87 ± 2.92 mm, respectively, in the horizontal and vertical directions. No significant difference was observed in the mean cross-sectional area of the nasopharynx (P > .05) between T1 and T2, while significant differences between T1 and T2 were found in the mean cross-sectional areas of the palatopharynx, glossopharynx, and hypopharynx (P < .05); these mean cross-sectional areas were decreased by 21.02% ± 7.89%, 25.18% ± 13.51%, and 38.19% ± 5.51%, respectively. The largest change in the cross-sectional area is always noted in the hypopharynx. There was a significant correlation among the retraction distance of the upper incisor at its edge, the retraction distance of the hyoid in the horizontal direction, and the decrease of the hypopharynx.Conclusion:Large incisor retraction leads to narrowing of the upper airway in adult bimaxillary protrusion patients.     

Correlation between objective and subjective evaluation of profile in bimaxillary protrusion patients after orthodontic treatment

Objective:To correlate the objective cephalometric measurements with subjective facial esthetics in patients with bimaxillary protrusion.Materials and Methods:The sample consisted of 60 Asian-Chinese patients with bimaxillary protrusion who met the inclusion criteria. The facial esthetics of posttreatment profile and the change of profile on standardized lateral photographs were rated by a panel of 10 orthodontists and a panel of 10 lay persons with bimaxillary protrusion. All of the pretreatment and posttreatment cephalograms were digitized and traced. Twenty-five cephalometric measurements were constructed and analyzed. Correlations between the subjective facial esthetic scores and each cephalometric measurement were evaluated.Results:The cephalometric measurements correlated with the facial esthetic scores of posttreatment profile given by the orthodontist and the lay persons were basically the same. For the evaluation of posttreatment profile in bimaxillary protrusion patients, the upper and lower lip to E-line, upper and lower incisor tip to AP plane, Pg-NB distance, mentolabial angle, and sulcus depth correlated significantly with the esthetic score. For the evaluation of profile change during orthodontic treatment, retraction of upper incisor relative to AP plane or the perpendicular line through sella (line Y), change of upper incisor inclination, change of mentolabial sulcus depth, and retraction of lips relative to E-line were correlated positively with the esthetic value.Conclusions:Cephalometric measurements of lip position, incisor position, and chin morphology were key parameters correlated to facial esthetics.     

The effect of anterior tooth retraction on lip position of orthodontically treated adult Indonesians.

This study was conducted to determine upper and lower lip changes after orthodontic treatment of bimaxillary dental protrusion in adult Indonesians. Pretreatment and posttreatment cephalograms of 40 patients (6 males and 34 females) who required extraction of 4 premolars, were traced, superimposed, and measured. The changes of anterior tooth position (measured as the horizontal distance from the incisal tip to a constructed vertical through sella) were correlated with changes in the upper and lower lip positions with the Pearson correlation method. Significant positive correlation was found between changes of the maxillary and mandibular incisors with the changes in both the upper lip (r(U1) = 0.39, P <.05; r(L1) = 0.44, P <.01) and the lower lip (r(U1) = 0.44, P <.01; r(L1) = 0.51, P <.01) positions. By using stepwise multiple regression, it was found that for every millimeter of mandibular incisor retraction, 0.4 mm of upper lip retraction and 0.6 mm of lower lip retraction were produced. This study concluded that, for this Indonesian sample, a strong correlation exists between mandibular anterior tooth retraction and the position of both lips.     

Lip changes after premolar extraction in Class I bimaxillary protrusion: A retrospective study in Thai female adults

Purpose

To determine the ratios of dental and lip changes and develop the predictive equations of lip changes in Class I bimaxillary protrusion in Thai female adults after orthodontic treatment with 4 premolars extraction.

微种植支抗矫治成人骨性Ⅱ类突面型患者的矢状向疗效观察

目的 使用微种植支抗矫治成人骨性Ⅱ类突面型,观察矫治前后矢状向牙齿突度和唇突度变化.方法 选取36例治疗结束的成人骨性Ⅱ类突面型患者,所有患者均是拔除4颗第一前磨牙使用自攻型微种植体作为支抗内收前牙.对治疗前、后头颅侧位片进行测量分析.结果 36例患者的切牙、软组织等测量指标发生显著性变化,上切牙内收(5.98±3.8...     

影响双颌前突青少年患者唇部内收因素的研究

目的 探讨影响双颌前突青少年患者正畸治疗后唇部内收的因素.方法 对满足纳入标准的37例双颌前突青少年患者进行治疗前后的X线头影测量分析.测量治疗前软组织、硬组织、牙体组织项目及治疗后软硬组织变化项目共27项,应用多元线性回归（后退法）筛选影响唇部变化的敏感因素.结果 治疗后上中切牙颈缘点矢状向变化,治疗前年龄,上唇缘点至E线距离和颏部厚度影响上唇缘点矢状向内收变化,回归方程相关系数为0.875;治疗后下中切牙切缘矢状向变化,治疗前下唇缘点至E线距离,下唇紧张度,颏唇角和颏部厚度影响下唇缘点矢状向变化,回归方程相关系数为0.887.结论 治疗前生长潜力、骨性、牙性、软组织特点,及治疗后牙性变化影响双颌前突患者唇部内收变化.     

微螺钉-横腭弓联合支抗辅助正畸治疗临床疗效研究

目的：通过对单纯微螺钉支抗和微螺钉-横腭弓联合支抗辅助治疗成人双颌前突患者临床疗效的比较,探索联合支抗辅助治疗的优越性。方法：选择平均年龄为21.68岁的双颌前突患者22名,正畸治疗中分别以微螺钉（组1）、微螺钉与横腭弓联合（组2）加强支抗,对2组应用不同支抗患者术前术后软硬组织的变化差异进行统计学比较。结果：组2的上唇美线距LS-EP、上颌磨牙矢状位置U6-VP、上颌磨牙垂直位置U6-HP、上唇突距LS-VP、上切牙水平距U1-VP、上颌磨牙间宽度U6-U6治疗前后的差值较组1有显著性差异;两支抗组其他测量值差值无统计学意义。结论：微螺钉-横腭弓联合应用在三维方向对上颌磨牙的控制较微螺钉更有效和稳定,更多的内收上切牙及上唇。     

Changes in Lip Contour Following Treatment of Maxillary Protrusion with Esthetic Orthodontic Appliances

With the advent of acid etching techniques and the elimination of unesthetic band materials, direct bonding of orthodontic attachments kindled a desire for cosmetic appliances such as labial ceramic brackets and lingual orthodontics. Owing to the esthetic nature of our combination upper-lingual lower-ceramic orthodontic approach, adults who would have normally avoided orthodontic treatment are now seeking treatment. This study evaluated the cephalometric changes in the soft tissue lip profile following treatment of Class II Division 1 malocclusion with upper first bicuspid extractions with our esthetic orthodontic appliance approach. Serial lateral cephalograms (pretreatment and posttreatment) of 16 adult patients with a mean age of 22.1 ± 3.2 years were studied. The mean upper incisor retraction, upper lip retraction, upper lip lengthening, and lower lip retraction were 5.75 ± 1.91 mm, 2.8 ± 1.4 mm, 1.5 ± 0.6 mm, and 1.4 ± 0.6 mm, respectively. All these changes were statistically significant (p < 0.01). The nasolabial angle increase of 10.8 ± 3.0 degrees was also statistically significant (p < 0.01). The upper lip retraction to upper incisor retraction was 1:2.1, while the upper lip lengthening to upper incisor retraction was 1:3.8. The correlation coefficients (r) were 0.91 (p < 0.01) and 0.57 (p < 0.01), respectively. This study shows that significant esthetic changes in lip profile are possible with this cosmetic orthodontic appliance approach. The treatment results in this study appear comparable to those published with labial metal brackets. With very few exceptions, patients were able to adapt within 2 weeks, with almost no trauma to the tongue.     

Changes in lip contour following treatment of maxillary protrusion with esthetic orthodontic appliances.

With the advent of acid etching techniques and the elimination of unesthetic band materials, direct bonding of orthodontic attachments kindled a desire for cosmetic appliances such as labial ceramic brackets and lingual orthodontics. Owing to the esthetic nature of our combination upper-lingual lower-ceramic orthodontic approach, adults who would have normally avoided orthodontic treatment are now seeking treatment. This study evaluated the cephalometric changes in the soft tissue lip profile following treatment of Class II Division 1 malocclusion with upper first bicuspid extractions with our esthetic orthodontic appliance approach. Serial lateral cephalograms (pretreatment and posttreatment) of 16 adult patients with a mean age of 22.1 +/- 3.2 years were studied. The mean upper incisor retraction, upper lip retraction, upper lip lengthening, and lower lip retraction were 5.75 +/- 1.91 mm, 2.8 +/- 1.4 mm, 1.5 +/- 0.6 mm, and 1.4 +/- 0.6 mm, respectively. All these changes were statistically significant (p < 0.01). The nasolabial angle increase of 10.8 +/- 3.0 degrees was also statistically significant (p < 0.01). The upper lip retraction to upper incisor retraction was 1:2.1, while the upper lip lengthening to upper incisor retraction was 1:3.8. The correlation coefficients (r) were 0.91 (p < 0.01) and 0.57 (p < 0.01), respectively. This study shows that significant esthetic changes in lip profile are possible with this cosmetic orthodontic appliance approach. The treatment results in this study appear comparable to those published with labial metal brackets. With very few exceptions, patients were able to adapt within 2 weeks, with almost no trauma to the tongue.     

Ethnic differences in upper lip response to incisor retraction

INTRODUCTION: The purpose of this retrospective longitudinal study was to investigate the response of the upper lip to incisor retraction and to ascertain the effect of ethnicity on this response. METHODS: Pretreatment and posttreatment lateral cephalograms of 88 postpubertal female patients (44 black and 44 white; mean age, 18.45 years) were evaluated. The groups were matched by age and the amount of incisor retraction at incisor superius. RESULTS: Although significant pretreatment differences existed between the groups in some cephalometric measurements, analysis of the treatment changes demonstrated significant differences only in incisor inclination. Hard and soft tissue changes of the black group were more downward, whereas changes in the white group were more backward. Multivariate regression analysis showed that the horizontal response of the upper lip to hard tissue changes at subnasale and superior labial sulcus was different in whites than in blacks. At subnasale, stepwise multivariate regression analysis showed that ethnicity contributed to the upper lip response to incisor retraction and was significantly greater in the white group. CONCLUSIONS: The hard and soft tissue treatment changes of the black group were more downward, and those of the white group were more backward. Ethnic differences exist in the soft tissue response to hard tissue changes in the upper lip, and at subnasale and the superior labial sulcus; however, these response differences at superior labial sulcus can be explained by the ethnic differences in initial lip thickness and incisor inclination; they are not due in and of themselves to ethnicity. The change at prosthion was significantly correlated with the response of the upper lip at labrale superius to incisor retraction. Ethnicity added no increase to the predictability of the response. When incisor retraction was performed, the final horizontal upper lip position could be accurately and reliably predicted.     

Profile changes following orthodontic treatment of bimaxillary protrusion in adults with the Begg appliance

Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary protrusion were treated with the Begg appliance following extraction of four first premolars. A cephalometric study was undertaken to determine the soft tissue changes in lip profile following treatment. Results show that the upper incisors were retracted by 5.6 mm +/- 0.8 mm and the lower incisors by 4.4 +/- 0.8 mm on the average. The nasolabial angle became more obtuse increasing from 80.7 degrees to 90.7 degrees. The upper lip and lower lip lengthened by 1.9 mm and 1.2 mm, respectively. The lower lip to 'E' line reduced from 7.5 mm to 3.7 mm. All the previous changes were statistically significant (p less than 0.01). The upper lip to upper incisor retraction was 1:2.2 while the lower lip to lower incisor retraction was 1:1.4. The correlation coefficients (r) were 0.72 (p less than 0.01) and 0.80 (p less than 0.01), respectively. The changes in the cants of mandibular and occlusal planes were statistically insignificant. This study shows that the Begg appliance has the ability to significantly reduce bimaxillary protrusions and thereby improve facial aesthetics.     

Nance弓支抗下双颌前突患者拔牙矫治后软组织变化及与硬组织关系的研究

目的 探讨传统支抗下双颌前突拔牙患者正畸治疗后软组织的变化及与硬组织变化的关系.方法 应用回顾性研究方法,对满足纳入标准的29例拔除四个第一双尖牙并应用Nance弓增加支抗的女性成人双颌前突患者进行治疗前后的手工X线头影测量分析.测量软硬组织项目35项,应用SPSS 15.0软件进行统计分析.治疗前后的变化用配对t检验,软组织变化的相关分析用Pearson相关分析.结果 软组织测量项目显示,经过正畸治疗患者的上、下唇突度、软组织A点及B点的突度减小,颏唇沟深度增加,差异有统计学意义（P＜0.01）;上、下唇基底厚度减小,上唇突厚度增大,下唇突厚度减小,差异有统计学意义（P＜0.01）.而上唇长度、软组织颏前点突度在正畸治疗前后差异无统计学意义.与上唇突度变化（ ΔUL-SL）相关的硬组织测量项目为ΔU1-SL（r=0.469,P＜0.01）;与下唇突度变化（△LL-SL）相关的硬组织测量为ΔSNA（r=0.436,P＜0.05）、ΔU1 -SL（r=0.374,P＜.05）、△L1-SL（r=0.478,P＜0.01）;上、下唇突度变化正相关.鼻唇角的变化与ΔU1-SL（r=-0.534,P＜0.01）、△UL-E（r=-0.394,P＜0.05）负相关,与△A’-SL（r=0.478,P＜0.05）、ΔULL（r=0.474,P＜0.05）及ΔA’-A（r=0.423,P＜0.05）正相关.颏唇沟深度（B’-E）与下切牙的内收（ΔL1-SL）及下唇突度变化（ΔLL-SL）正相关.上唇突度减小与上前牙内收的关系为1∶0.6（以审美平面评价）或1∶0.62（以蝶鞍点垂线评价）.下唇突度减小与下切牙内收关系是1∶1.13;而下唇变化与上前牙内收的关系则是1∶（0.83±0.21）（LL-SL/U1-SL）.结论 传统支抗控制下拔除四个双尖牙后双颌前突成人侧貌改善显著.面下部软硬组织间存在中度相关关系.     

Upper lip changes correlated to maxillary incisor retraction--a metallic implant study

The soft tissue changes after the extraction of maxillary first premolars and subsequent anterior tooth retraction were evaluated for 16 Class II, division 1 patients. Pre- and posttreatment lateral head cephalograms were evaluated using superimpositions on Bj?rk-type metallic implants in the maxilla. The patient sample was divided into group I patients, those who did exhibit lip seal at rest in the pretreatment cephalogram and group II patients, those who did not exhibit lip seal at rest in the pretreatment cephalogram. Upper incisor retraction was followed by a similar ratio of upper lip retraction in both the lip seal and nonsealed groups (1:0.75 and 1:0.70 mean ratios, respectively). However, those without lip seal did demonstrate more retraction at stomion (USt). The final upper lip position (Ls) was reasonably correlated with retraction of the cervical maxillary incisor point (cU1) with determination coefficients of 63.6% in the lip sealed and 68.5% in the lip incompetent groups. Although labial and nasolabial angles tended to open after incisor retraction, there was little predictability for this response.     

Skeletal and Soft Tissue Point A and B Changes Following Orthodontic Treatment of Nepalese Class I Bimaxillary Protrusive Patients

Objectives:To test the hypothesis that there is no correlation in the interrelationships of skeletal and soft tissue points A and B with anterior teeth retraction.Materials and Methods:Thirty adult Class I bimaxillary protrusion patients treated with preadjusted appliances after first premolar extraction were included. Pretreatment and posttreatment variables were compared using paired t-test, and the relationship of soft and hard tissue variables was studied using Pearson correlation coefficient and linear regression equation.Results:Mean point A and soft tissue point A (sA) were retracted 2.7 mm (P < .001) and 1.7 mm (P < .001), and mean point B and soft tissue point B (sB) were retracted 2.1 mm (P < .001) and 1.2 mm (P < .001), respectively. Mean ratio of retraction of point A with sA and point B with sB was 1.5∶1 and 1.7∶1, respectively. A significant degree of correlation existed between retraction of point A and soft tissue point A (r  =  0.648, P < .01) and point B and soft tissue point B (r  =  0.806, P < .01). Linear regression analysis used to predict the changes in sA and sB showed significant relationship between point A and sA (r  =  0.543, F  =  11.7, R²  =  0.29, P < .001) and point B and sB (r  =  0.825, F  =  59.7, R²  =  0.68, P < .001). Decreases in hard and soft tissue convexity were due to the retraction of the skeletal and soft tissue points A and B in addition to the lips retraction.Conclusions:The hypothesis is rejected. Retraction of skeletal point A and B lead to retraction of sA and sB under controlled root positions. Nearly proportionate changes existed in the skeletal points and overlying corresponding soft tissue points.