Stability of class II treatment with Pendulum and Jones jig followed by fixed appliances

Abstract Objective: To identify pretreatment cephalometric variables for the prediction of individual mandibular outcomes of functional jaw orthopedics (FJO) followed by fixed appliances in Class II patients treated at the peak in mandibular growth. Materials and Methods: The study was performed on 51 subjects (24 females, 27 males) with Class II malocclusion. First-phase therapy was accomplished with a twin block in 16 subjects, a stainless steel crown Herbst in 15 subjects, and an acrylic splint Herbst in 20 subjects. Lateral cephalograms were available at the start of treatment with FJO and at the completion of fixed appliance therapy. All subjects received FJO at the peak in mandibular growth (CS 3 at T1). Individual responsiveness to Class II treatment including FJO was defined on the basis of the T2-T1 increment in total mandibular length (Co-Gn) when compared with untreated Class II subjects. Results: Discriminant analysis identified a single predictive parameter (Co-Go-Me°) with a classification power of 80%. Pretreatment vertical and sagittal parameters were not able to improve the prediction based upon the mandibular angle. Conclusions: A Class II patient at the peak in skeletal maturation (CS 3) with a pretreatment Co-Go-Me° smaller than 125.5° is expected to respond favorably to treatment including FJO. A Class II patient at CS 3 with a pretreatment value for Co-Go-Me° greater than 125.5° is expected to respond poorly to treatment including FJO.

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Long-term skeletal and dental effects and treatment timing for functional appliances in Class II malocclusion

The Angle Orthodontist ◽

10.2319/052912-450.1 ◽

2012 ◽

Vol 83 (2) ◽

pp. 334-340 ◽

Cited By ~ 40

Author(s):

Lorenzo Franchi ◽

Chiara Pavoni ◽

Kurt Faltin ◽

James A. McNamara ◽

Paola Cozza

Keyword(s):

Treatment Group ◽

Class Ii ◽

Control Group ◽

Class Ii Malocclusion ◽

Treatment Timing ◽

Class Ii Treatment ◽

Lateral Cephalograms ◽

Functional Appliances ◽

Fixed Appliances

ABSTRACT Objective: To analyze the long-term skeletal and dentoalveolar effects and to evaluate treatment timing of Class II treatment with functional appliances followed by fixed appliances. Materials and Methods: A group of 40 patients (22 females and 18 males) with Class II malocclusion consecutively treated either with a Bionator or an Activator followed by fixed appliances was compared with a control group of 20 subjects (9 females and 11 males) with untreated Class II malocclusion. Lateral cephalograms were available at the start of treatment (mean age 10 years), end of treatment with functional appliances (mean age 12 years), and long-term observation (mean age 18.6 years). The treated sample also was divided into two groups according to skeletal maturity. The early-treatment group was composed of 20 subjects (12 females and 8 males) treated before puberty, while the late-treatment group included 20 subjects (10 females and 10 males) treated at puberty. Statistical comparisons were performed with analysis of variance followed by Tukey's post hoc tests. Results: Significant long-term mandibular changes (Co-Gn) in the treated group (3.6 mm over the controls) were associated with improvements in the skeletal sagittal intermaxillary relationship, overjet, and molar relationship (∼3.0–3.5 mm). Treatment during the pubertal peak was able to produce significantly greater increases in total mandibular length (4.3 mm) and mandibular ramus height (3.1 mm) associated with a significant advancement of the bony chin (3.9 mm) when compared with treatment before puberty. Conclusion: Treatment of Class II malocclusion with functional appliances appears to be more effective at puberty.

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The British Orthodontic Society MOrth Cases Prize 2019

Journal of Orthodontics ◽

10.1177/1465312520982876 ◽

2021 ◽

pp. 146531252098287

Author(s):

Adam C Jowett

Keyword(s):

Class Ii ◽

Functional Appliance ◽

First Case ◽

Permanent Molars ◽

Fixed Appliances ◽

Unerupted Teeth ◽

Removable Appliance ◽

Division 2 ◽

Lower Arch ◽

First Permanent Molars

This paper describes the orthodontic treatment of two cases that were successful in winning the British Orthodontic Society (BOS) Membership in Orthodontics (MOrth) Cases Prize in 2019. The first case describes the management of a 12-year-old girl with a Class II division 2 malocclusion complicated by moderate upper and lower arch crowding, multiple unerupted teeth, restored lower first permanent molars, pseudo-transposition of the lower left lateral incisor and canine, and diminutive upper lateral incisors. Treatment involved a combination of an upper removable appliance followed by upper and lower preadjusted edgewise fixed appliances. Anteroposterior correction and overbite reduction was achieved with triangular Class II elastics with posterior occlusal disengagement. Both upper permanent canines were exposed and aligned, and the diminutive upper incisors built up with resin-based composite. Treatment was completed over a period of 23 months. The second case describes the management of a 13-year-old boy with a Class II division 2 malocclusion complicated by severe upper and lower arch crowding with unerupted UR5, UL4, LR3, rotated LR5, an increased overbite complete to tooth, buccally displaced upper canines and hypoplastic upper first premolars. Treatment involved a first phase of functional appliance therapy, followed by the extraction of UR4, UL4, LL5, LR4 and upper and lower preadjusted edgewise fixed appliances over a 28-month period.

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Does daily wear time of Twin Block reliably predict its efficiency of class II treatment?

Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie ◽

10.1007/s00056-021-00300-7 ◽

2021 ◽

Author(s):

Michal Sarul ◽

Marek Nahajowski ◽

Grzegorz Gawin ◽

Joanna Antoszewska-Smith

Keyword(s):

Statistical Significance ◽

Characteristic Curve ◽

Class Ii ◽

Class I ◽

Rank Test ◽

Treatment Efficiency ◽

Significance Level ◽

Twin Block ◽

Wear Time ◽

Class Ii Treatment

Abstract Purpose The objective of this study was to investigate how daily wear time (DWT) influences class II malocclusion treatment efficiency. Materials and methods The study group consisted of 55 patients (mean age 10.4 years) diagnosed with a class II/1 malocclusion. Twin block appliances, with built-in Theramon® microsensors (MC Technology, Hargelsberg, Austria) to monitor patients’ cooperation (daily wear time assessment), were used for treatment. Cephalograms were taken and the following initial and final measurements were compared: Co-Gn, Co-Go, Co-Olp, Pg-Olp, WITS, SNA, SNB, ANB, Co-Go-Me, overjet, molar and canine relationships. The Shapiro–Wilk test, Wilcoxon signed-rank test, Student’s t-test, Levene’s test, Mann–Whitney U test, Kruskal–Wallis test, χ2 test, and Spearman’s rank correlation coefficient with p < 0.05 set as the statistical significance level were used to determine the correlation of the outcomes with DWT; a ROC (receiver operating characteristic) curve was calculated to illustrate diagnostic ability of the binary classifier system. Results DWT was very highly positively correlated with change of the Pg-Olp parameter and highly with an improvement in the ANB, SNA, and SNB angles, an increase in the WITS parameter and an increase in Co-Gn distance. DWTs < 7.5 h correlated with significantly less improvement of the investigated variables. However, DWT > 7.5 h did not significantly correlate with the improvement of the overjet and most of the linear parameters in the mandible. The ROC curve and its AUC (area under curve) allowed the determination of a DWT of 7 h and 48 min to be capable of establishing a class I relationship with 83% probability. Conclusions Class II treatment efficiency was influenced by DWT; an 8 h threshold value had an 83% probability of establishing a class I relationship.

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A strategy for nonextraction class II treatment

Seminars in Orthodontics ◽

10.1016/s1073-8746(98)80039-x ◽

1998 ◽

Vol 4 (1) ◽

pp. 26-32 ◽

Cited By ~ 9

Author(s):

Anthony A. Gianelly

Keyword(s):

Class Ii ◽

Class Ii Treatment

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Orthodontic Management of A Girl With Class Ii Div-2 Malocclusion With Deep Bite & Crowding: A Case Report

Bangladesh Journal of Orthodontics and Dentofacial Orthopedics ◽

10.3329/bjodfo.v6i1.42399 ◽

2016 ◽

pp. 29-34

Author(s):

Shamima Nargish ◽

Md Zakir Hossain

Keyword(s):

Case Report ◽

Anterior Segment ◽

Class Ii ◽

Class I ◽

Deep Bite ◽

Canine Retraction ◽

Fixed Appliances ◽

Leveling And Alignment

We describe the treatment of a girl, age 18 years with Class II div-2 malocclusion with deep bite and crowding. Treatment consisted mainly of bite opening, 1st premolars extractions, canine retraction, arch co-ordination, leveling and alignment with Edgewise fixed appliances by multiloop technique. However the treatment resulted in Class I incisor relation with proper alignment of upper and lower anterior segment, an ideal overjet, overbite and incisor angulations. Ban J Orthod & Dentofac Orthop, April 2016; Vol-6 (1-2), P.29-34

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