Treatment effects of mandibular anterior position training versus a fixed Class II corrector in growing patients with skeletal Class II malocclusion

Class II elastics for self-exercise induced mandibular anterior repositioning of skeletal Class II growing patient with retrognathic mandible

Status

Active, not recruiting

Phases

Phase 1Phase 2

Study type

Interventional

Source

TCTR

Registry ID

TCTR20180220003

Enrollment

Unknown

Registered

2018-02-20

Start date

2014-12-18

Completion date

Unknown

Last updated

2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Skeletal Class II growing patient with retrognathic mandible Orthodontic Appliances&#44

Interventions

Preadjusted edgewise fixed appliances including 0.018&#45

inch slot brackets on incisors and 0.022&#45

inch slots on remaining teeth (RothTM system

Ormco&#44

City&#44

CA&#44

USA) were placed on all patients. Initial alignment was achieved using NiTi archwires and stainless steel until 0.016Ã—0.022&#45

inch stainless steel wires were placed. Class II elastics group Stainless steel wire (0.016â€Ã—0.022â€) was retained on upper and lower arches. Kobayashi hooks were attached to mesial upper latera

except when eating and brushing teeth. Patients received mandibular position training and were instructed to hold their mandible forward at all times when awake&#44

and chew/bite and perform intra&#45

oral function using the protruded position and bite in Class I position. Patients were reminded at each appointment and their awareness of protruding the mandible increased with practice. ,Preadjusted

inch stainless steel wires were placed. Rigid 0.018â€Ã—0.025â€ stainless steel archwires were inserted on upper and lower arches. Colligation was performed using a 0.010â€ stainless steel ligature

Experimental Device,Experimental Device

Class II elastics and anterior mandibular position training,Fixed Class II corrector

Eligibility

Sex/Gender

All

Age

10 Years to 13 Years

Inclusion criteria

Inclusion criteria: : (1) skeletal Class II malocclusion and a retrognathic mandible (retruded pogonion vs. nasion perpendicular line, < 4 mm); (2) growth stage 4-5 (acceleration/peak growth) on hand and wrist radiographs according Bjork [1972] and Grave and Brown [1976]; (3) and no underlying disease.

Exclusion criteria

Exclusion criteria: (1) they did not comply to training or wearing Class II elastics; (2) the PowerScopeTM broke repeatedly, or (3) class II relationship did not improve after 12 months of wearing fixed appliance. Excluded patients were treated using other methods until malocclusion resolved.

Design outcomes

Primary

Measure	Time frame
Skeletal change 1.5 year Lateral Cephalometric x-ray	—

Secondary

Measure	Time frame
Dental change 1.5 year Lateral Cephalometric x-ray,Facial convexity 1.5 year Lateral Cephalometric x-ray	—

Countries

Thailand

Contacts

Public ContactChairat Charoemratrote

Faculty of Dentistry, Prince of Songkla University

metalbracket@hotmail.com+66897326858

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 9, 2026