Twin Block Appliance in Incremental Versus Maximum Bite Advancement in Skeletal Class II

Cairo University (CU)

Status: Unknown

Conditions: Mandibular Retrognathism; Mandibular Hypoplasia

Treatments: Device: Twin Block Appliance set to maximum bite; Device: Modified Twin Block

Study type: Interventional

Funder types: Other

Identifiers

NCT04562545

CEBD-CU-2020-09-08

Details and patient eligibility

About

The aim of this study is to compare to different protocols to treat Class II malocclusion in growing subjects using the twin block appliance

Full description

• Patients will be clinically and radio-graphically examined for eligibility

• Eligible patients will be randomly assigned to one of two groups:

  • Control Group: Twin Block Appliance fabricated to Maximum Bite Advancement group
  • Intervention Group: Twin Block Appliance fabricated for Incremental Bite Advancement group

• Records will be taken and impressions will be made and poured. In the control group, bite registration will be made with maximum mandibular advancement. In the intervention group, bite registration is made to habitual bite to make a modified twin block.

• Patients will be recalled every 6 weeks for 8 months for monitoring and reactivation of the appliance.

Enrollment: 24 estimated patients

Sex: Female

Ages: 9 to 13 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Growing Female Patient
• Skeletal Class II Malocclusion due to deficient mandible
• Overjet of 7 to 10 mm
• Short or normal vertical facial pattern
• No previous orthodontic nor orthopedic treatment

Exclusion criteria

• Syndromes or Chronic Illness
• Skeletal Class II Malocclusion due to excessive maxilla
• Vertical skeletal growth pattern
• Habits

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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24 participants in 2 patient groups

Maximum Bite Advancement

Active Comparator group

Treatment:

Device: Twin Block Appliance set to maximum bite

Incremental Bite Advancement

Experimental group

Treatment:

Device: Modified Twin Block