Treatment response and long-term dentofacial adaptations to maxillary expansion and protraction

Ngan, Peter; Hägg, Urban; Yiu, Cky; Wei, Stephen H.Y.

doi:10.1016/s1073-8746(97)80058-8

Cited by 172 publications

(160 citation statements)

References 25 publications

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“…26 When individual patient data were analyzed, we found that over 70% of the patients (16 of 22) could be considered clinically successful in the long term, whereas less than 30% of them (6 of 22) were unsuccessful at T3 because of relapse in the occlusal relationships. The prevalence rate for the long-term success of RME/ FM therapy of Class III malocclusion appears as a favorable result, and it is similar to the success rates reported in other studies on orthopedic Class III treatment that included a posttreatment interval (76% according to Westwood et al 4 ; 75% according to Ngan et al 9 and Wells et al 6 ; 67% according to H€ agg et al 5 ).…”

Section: Discussionsupporting

confidence: 84%

“…First, a significant tendency for the reestablishment of the Class III growth pattern has been widely demonstrated after active protraction therapy, with special emphasis during the pubertal growth spurt. 4,[8][9][10] Second, pubertal growth tends to last longer in Class III subjects compared with Class I subjects. 11 On the other end, long-term observations at the end of active craniofacial growth are available for different orthopedic and orthodontic approaches: chincup therapy, with favorable short-term changes often not maintained at the end of growth, 12 and mandibular cervical headgear, with greater long-term stability of favorable mandibular modifications.…”

mentioning

confidence: 99%

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Stability of rapid maxillary expansion and facemask therapy: A long-term controlled study

Masucci

Franchi

Defraia

et al. 2011

American Journal of Orthodontics and Dentofacial Orthopedics

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Introduction: The aim of this prospective controlled study was to evaluate the long-term effects of rapid maxillary expansion and facemask therapy in Class III subjects. Methods: Twenty-two subjects (9 boys, 13 girls; mean age, 9.2 years 6 1.6) with Class III disharmony were treated consecutively with rapid maxillary expansion and facemask therapy followed by fixed appliances. The patients were reevaluated at the end of the 2-phase treatment (mean age, 14.5 years 6 1.9) and then recalled about 8.5 years after the end of rapid maxillary expansion and facemask treatment (mean age, 18.7 years 6 2.1). Two groups of controls with untreated Class III malocclusion were used for statistical comparisons of the short-term and long-term intervals. Statistical comparisons were performed with the Mann-Whitney U test. Results: In the long term, no significant differences in maxillary changes were recorded, whereas the treatment group showed significantly smaller increases in mandibular protrusion. The sagittal maxillomandibular skeletal variables maintained significant improvements in the treatment group vs the control groups. Conclusions: In the long term, rapid maxillary expansion and facemask therapy led to successful outcomes in about 73% of the Class III patients. Favorable skeletal changes were mainly due to significant improvements in the sagittal position of the mandible. (Am J Orthod Dentofacial Orthop 2011;140:493-500)

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Section: Discussionsupporting

confidence: 84%

mentioning

confidence: 99%

Stability of rapid maxillary expansion and facemask therapy: A long-term controlled study

Masucci

Franchi

Defraia

et al. 2011

American Journal of Orthodontics and Dentofacial Orthopedics

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“…[10][11][12][13] These results were often confirmed in controlled trials that usually included combined maxillary expansion and FM therapy. [14][15][16][17][18][19][20][21] Clinical studies have also shown variable effects of maxillary protraction therapy on the amount of mandibular growth, with a tendency toward Class III relapse when the mandible rotated downward and backward during treatment. [17][18][19]21 Only a few studies dealing with the effects of orthopedic therapy of Class III malocclusion included posttreatment observations to evaluate relapse tendencies after active therapy.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17][18][19][20][21] Clinical studies have also shown variable effects of maxillary protraction therapy on the amount of mandibular growth, with a tendency toward Class III relapse when the mandible rotated downward and backward during treatment. [17][18][19]21 Only a few studies dealing with the effects of orthopedic therapy of Class III malocclusion included posttreatment observations to evaluate relapse tendencies after active therapy. 15,[17][18][19][20][21][22][23][24][25] Also, few trials incorporated an untreated control sample of Class III subjects followed longitudinally.…”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19]21 Only a few studies dealing with the effects of orthopedic therapy of Class III malocclusion included posttreatment observations to evaluate relapse tendencies after active therapy. 15,[17][18][19][20][21][22][23][24][25] Also, few trials incorporated an untreated control sample of Class III subjects followed longitudinally. 16 Predictive variables for satisfactory long-term outcomes of Class III early treatment can be identified in the overcorrection of overjet (OJ) 15,18 and the appropriate control of vertical dentoalveolar height to prevent an unfavorable clockwise rotation of the mandible.…”

Section: Introductionmentioning

confidence: 99%

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Treatment and posttreatment effects of a facial mask combined with a bite-block appliance in Class III malocclusion

Cozza¹,

Baccetti²,

Mucedero³

et al. 2010

American Journal of Orthodontics and Dentofacial Orthopedics

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Introduction:In this cephalometric investigation, we analyzed the treatment and posttreatment effects of an orthopedic protocol for Class III malocclusion consisting of a facial mask combined with a removable biteblock appliance. Methods: The treated sample consisted of 22 Class III patients treated with the facial mask and bite-block protocol before the pubertal growth spurt (mean age, 8.9 6 1.5 years). Treated subjects were evaluated after facial mask and bite-block therapy and at a posttreatment observation in absence of retention. The treated group was compared with a matched control group of 12 untreated Class III subjects. All treated and control subjects were postpubertal at the final observation. Significant differences between the treated and control groups were assessed with the Mann-Whitney U test (P \0.05). Results: Both angular and linear sagittal measurements of the maxilla showed significant improvements during active treatment. Significant improvements of SNA angle, ANB angle, overjet, and molar relationship remained stable during the posttreatment period. No significant effect was found in the mandibular skeletal measures. No significant protraction of the maxillary incisors or retraction of the mandibular incisors was observed. Conclusions: A bite-block appliance in the mandibular arch with a facial mask enabled effective control of mandibular rotation with progressive closure of the gonial angle. This added to the favorable maxillary outcomes of the treatment protocol. (Am J Orthod Dentofacial Orthop 2010;138:300-10)

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TAD‐anchored Maxillary Protraction

Chung

2020

Temporary Anchorage Devices in Clinical Orthodontics

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Treatment response and long-term dentofacial adaptations to maxillary expansion and protraction

Cited by 172 publications

References 25 publications

Stability of rapid maxillary expansion and facemask therapy: A long-term controlled study

Stability of rapid maxillary expansion and facemask therapy: A long-term controlled study

Treatment and posttreatment effects of a facial mask combined with a bite-block appliance in Class III malocclusion

TAD‐anchored Maxillary Protraction

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