Comparison of incisor inclination in patients with Class III malocclusion treated with orthognathic surgery or orthodontic camouflage

Troy, Beth A.; Shanker, Shiva; Fields, Henry W.; Vig, Katherine W.L.; Johnston, William M.

doi:10.1016/j.ajodo.2008.07.012

Cited by 120 publications

(154 citation statements)

References 23 publications

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“…Although final ANB improved to within the normal range in groups 2 and 4 (moderate APD groups), groups 1 and 3 (severe APD groups) were undercorrected (ANB, 1.0u and 1.1u, respectively). These findings are in accordance with those of Troy et al, 11 who reported that over 90% of the subjects improved skeletally with surgery but attained only 65% of the normal position by ANB. They also reported that 82% of subjects improved in Wits appraisal, but only 56% to 59% of the norm was achieved.…”

Section: Discussionsupporting

confidence: 83%

“…During postoperative orthodontic treatment, LI were ''round tripped'' back to their original position 11 because of a 'less-than-optimal amount' of the mandibular setback and resultant 'more-than-usual amount' of Post-C. Troy et al 11 reported that 75% of the LI were retroclined at the T2 stage and that 75% moved more lingually compared to the T1 stage.…”

Section: Discussionmentioning

confidence: 99%

“…Troy et al 11 reported that 75% of the LI were retroclined at the T2 stage and that 75% moved more lingually compared to the T1 stage. In this study, total achievement ratio dropped to around 23% of the expected decompensation amount in groups 1, 2, and 4 (Table 4).…”

Section: Discussionmentioning

confidence: 99%

“…11,12 Troy et al 11 used the NB line for evaluation of LI change. However, B point can be influenced by rotation of the mandible and the dimension of the anterior cranial base, 12 and eventually it was not appropriate for evaluation of real LI change.…”

Section: Discussionmentioning

confidence: 99%

“…If preoperative incisor decompensation (Pre-DC) is inadequate, the quality and quantity of the surgical outcome and postoperative incisor compensation (Post-C) can be compromised. 11 With regard to skeletal VT, Capelozza Filho et al 12 reported the existence of a correlation among the amount of incisor decompensation, mandibular setback surgery, postoperative mandibular excess, and lower anterior facial height. In addition, a thin alveolus, frequently encountered in patients with long lower facial height and skeletal CIII malocclusion, 13,14 can be regarded as an orthodontic wall that can affect the initial compensation (IC) as well as the Pre-DC and Post-C.…”

Section: Introductionmentioning

confidence: 99%

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Skeletal anteroposterior discrepancy and vertical type effects on lower incisor preoperative decompensation and postoperative compensation in skeletal Class III patients

Ahn¹,

Baek²

2011

The Angle Orthodontist

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Objective: To determine the initial compensation, preoperative decompensation, and postoperative compensation of the lower incisors according to the skeletal anteroposterior discrepancy and vertical type in skeletal Class III patients. Materials and Methods: The samples consisted of 68 skeletal Class III patients treated with twojaw surgery and orthodontic treatment. Lateral cephalograms were taken before preoperative orthodontic treatment (T0) and before surgery (T1) and after debonding (T2). According to skeletal anteroposterior discrepancy/vertical type (ANB, criteria 5 24u; SN-GoMe, criteria 5 35u) at the T0 stage, the samples were allocated into group 1 (severe anteroposterior discrepancy/hypodivergent vertical type, N 5 17), group 2 (moderate anteroposterior discrepancy/hypodivergent vertical type, N 5 17), group 3 (severe anteroposterior discrepancy/hyperdivergent vertical type, N 5 17), or group 4 (moderate anteroposterior discrepancy/hyperdivergent vertical type, N 5 17). After measurement of variables, one-way analysis of variance with Duncan's multiple comparison test, crosstab analysis, and Pearson correlation analysis were performed. Results: At T0, groups 3 and 2 exhibited the most and least compensated lower incisors. In group 2, good preoperative decompensation and considerable postoperative compensation resulted in different values for T0, T1, and T2 (IMPA, T0 , T2 , T1; P , .001). However, group 3 did not show significant changes in IMPA between stages. Therefore, groups 2 and 3 showed different decompensation achievement ratios (P , .05). Group 3 exhibited the worst ratios of decompensation and stability (24% and 6%, respectively, P , .001). Anteroposterior discrepancy/vertical type (ANB: P , .01 at T0 and T1, P , .001 at T2; SN-GoMe: P , .01, all stages) were strongly correlated with relative percentage ratio of IMPA to norm value. Conclusions: Skeletal anteroposterior discrepancy/vertical type results in differences in the amount and pattern of initial compensation, preoperative decompensation, and postoperative compensation of lower incisors in Class III patients. (Angle Orthod. 2011;81:64-74.)

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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