Factors influencing soft tissue profile changes following orthodontic treatment in patients with Class II Division 1 malocclusion

Maetevorakul, Suhatcha; Viteporn, Smorntree

doi:10.1186/s40510-016-0125-1

Cited by 51 publications

(34 citation statements)

References 24 publications

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“…The thickness of lower lip before treatment was another factor 11 affecting the prognosis of the lower lip, corresponding with previous reports. 12,28 Upper and lower lip changes in this study were consistent with Hershey, 7 who found that the lower lip had changed more than upper lip because lower lip had self-supporting anatomy and upper lip depended on other structures. 7 Correlation analysis between upper and lower incisor retraction showed low and moderate ability to predict lip response (adjusted R 2 = 0.29 and 0.48, respectively).…”

Section: Lower Lip Changessupporting

confidence: 88%

Prediction of Lip Changes after Incisor Retraction in Class II Division 1

Jongphairotkhosit¹,

Suntornlohanakul²,

Youravong³

2018

International Journal of Experimental Dental Science

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Aim: To evaluate the relationship of lip changes in anteroposterior direction and incisor retraction in Thai female patients with class II division 1 malocclusion. Materials and methods:The sample consisted of 100 pairs of pre-and posttreatment lateral cephalograms. All cephalograms were derived from class II division 1 Thai female adults who were treated with four premolar extraction and edgewise technique. Sixteen linear and eight angular measurements were made and evaluated for dental and lip changes. Paired t-test was used for testing the difference between before and after orthodontic treatment. Pearson correlation analysis was used for evaluating factors that correlate with lip changes and stepwise multiple linear regression was performed to make the prediction of lip changes and incisor retraction.Results: There was a significant correlation between lip changes and incisor retraction. The prediction of upper and lower lip changes in antero-posterior direction was mainly described by the cervical point of upper incisors (HcUI) (R 2 = 0.29), the tip of lower incisors (HtLI) and lower lip thickness (LL thickness) (R 2 = 0.48). Conclusion:Ratios of upper and lower incisors at tip point to upper and lower lips retraction were 1:0.46 and 1:1, respectively. The coefficient of determination for predicting upper and lower lips was 0.29 and 0.48 showing low to moderate predictability for lip changes.

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Section: Lower Lip Changessupporting

confidence: 88%

Prediction of Lip Changes after Incisor Retraction in Class II Division 1

Jongphairotkhosit¹,

Suntornlohanakul²,

Youravong³

2018

International Journal of Experimental Dental Science

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“…Group 1 presented a significantly smaller facial convexity at the posttreatment stage, probably because of the non-significanly greater upper lip retrusion, with treatment, than group 2 [ 21 , 29 – 32 ].…”

Section: Discussionmentioning

confidence: 99%

Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols

et al. 2017

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BackgroundThis study cephalometrically compared the dentoskeletal and soft tissue changes consequent to one and three-premolar extraction protocols of class II subdivision malocclusion treatment.MethodsA sample of 126 lateral cephalometric radiographs from 63 patients was selected and divided into two groups. Group 1 consisted of 31 type 1 class II subdivision malocclusion patients treated with asymmetric extractions of two maxillary premolars and one mandibular premolar on the class I side, with an initial mean age of 13.58 years. Group 2 consisted of 32 type 2 class II subdivision malocclusion patients treated with asymmetric extraction of one maxillary first premolar on the class II side, with an initial mean age of 13.98 years. t test was used for intergroup comparison at the pre- and posttreatment stages and to compare the treatment changes.ResultsGroup 1 had greater maxillomandibular sagittal discrepancy reduction and greater maxillary first molar extrusion. Group 2 had mandibular incisor labial inclination and protrusion, and group 1 had mandibular incisor lingual inclination and retraction. Maxillary molar asymmetry increased in group 2, while mandibular molar asymmetry increased in group 1.ConclusionsThe treatment changes produced by these two class II subdivision protocols are different to adequately satisfy the different needs for types 1 and 2 class II subdivision malocclusions.

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“…In our study, Li prediction was least accurate. The lower lip is influenced by the type of skeletal malocclusion [ 16 , 17 ], incisor position, angulation, soft tissue thickness, and tonicity; perioral musculature and muscle attachments [ 12 ]. The accuracy was within 2.0 mm 57 % ( X -axis) and 14 % ( Y -axis), respectively.…”

Section: Discussionmentioning

confidence: 99%

Accuracy of Dolphin visual treatment objective (VTO) prediction software on class III patients treated with maxillary advancement and mandibular setback

et al. 2016

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BackgroundDolphin® visual treatment objective (VTO) prediction software is routinely utilized by orthodontists during the treatment planning of orthognathic cases to help predict post-surgical soft tissue changes. Although surgical soft tissue prediction is considered to be a vital tool, its accuracy is not well understood in tow-jaw surgical procedures. The objective of this study was to quantify the accuracy of Dolphin Imaging’s VTO soft tissue prediction software on class III patients treated with maxillary advancement and mandibular setback and to validate the efficacy of the software in such complex cases.MethodsThis retrospective study analyzed the records of 14 patients treated with comprehensive orthodontics in conjunction with two-jaw orthognathic surgery. Pre- and post-treatment radiographs were traced and superimposed to determine the actual skeletal movements achieved in surgery. This information was then used to simulate surgery in the software and generate a final soft tissue patient profile prediction. Prediction images were then compared to the actual post-treatment profile photos to determine differences.ResultsDolphin Imaging’s software was determined to be accurate within an error range of +/− 2 mm in the X-axis at most landmarks. The lower lip predictions were most inaccurate.ConclusionsClinically, the observed error suggests that the VTO may be used for demonstration and communication with a patient or consulting practitioner. However, Dolphin should not be useful for precise treatment planning of surgical movements. This program should be used with caution to prevent unrealistic patient expectations and dissatisfaction.

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Factors influencing soft tissue profile changes following orthodontic treatment in patients with Class II Division 1 malocclusion

Cited by 51 publications

References 24 publications

Prediction of Lip Changes after Incisor Retraction in Class II Division 1

Prediction of Lip Changes after Incisor Retraction in Class II Division 1

Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols

Accuracy of Dolphin visual treatment objective (VTO) prediction software on class III patients treated with maxillary advancement and mandibular setback

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