the Condylar Response of Mini-plate Anchored Rigid Fixed Functional Appliance Versus Dentally Anchored Semi-rigid One
Condition: Class II Malocclusion
MeSH terms: Malocclusion; Malocclusion, Angle Class II; Overbite
Study type: Interventional
Phase: Phase 2/Phase 3

Summary: 
      This study will be directed to evaluate The effect of two different types of fixed functional
      appliances on the temporomandibular joint.

      Study design:

      Prospective randomized clinical study.

      Study setting and population:

      This study will be conducted on twenty orthodontic patients. The number of patients was
      dependent on a power study.

      Sample size calculation was based on the observed average effect size derived from previous
      article addressing "the effect of skeletally anchored Forsus FRD using miniplates for the
      treatment of Class II malocclusion
    

Detailed description: 
      Participants will be selected based on the following inclusion criteria:

        1. Skeletal class 2 malocclusion due to mandibular retrusion with increased overjet (SNA=
           82±4, ANB=≥4°).

        2. Mandibular arch with minimum (up to 4mm) or no crowding.

        3. All permanent teeth are erupted (3rd molar not included).

        4. Good oral and general health.

        5. No systemic disease or regular medication that could interfere and/or affect orthodontic
           teeth movement.

        6. No previous orthodontic treatment.

      outcomes measures:

        1. primary outcome: comparison of condylar volume of Herbst group versus TFBC group.

        2. secondary outcome: Measurement of of condylar volume within each group (Herbst group and
           TFBC group)

      Treatment steps:

      As for Group Ι:

        1. Two mini plates are chosen, the last hole in every plate is used to solder the ball
           housing of type IV Herbst appliance.

        2. The two mini plates are placed bilateral at the mandibular symphysis and fixed by at
           least 3 screws, the surgical wound is sutured leaving an extended part of the plate in
           the oral cavity which contain the soldered ball housing.

        3. The surgical wound is left for 2 weeks for proper soft tissue healing, in the meantime
           separation in the arch, band placement on the first premolar and molar bilateral
           followed by impression for construction of the upper Herbst splint.

        4. Cementation of upper Herbst splint with connecting the telescopic piston through fitting
           of the plunger into the tube bilaterally.

        5. When reactivation of the telescopic piston is needed, extension rings are used.

      As for Group ΙΙ:

        1. The patients will be treated by fixed orthodontic appliance with using series of
           orthodontic NiTi arch wires for levelling and alignment.

        2. Installation of series of orthodontic stainless steel arch wires until 0.0019 x 0.0025
           inch for both arches.

        3. Installation of the Twin Force Bite Corrector appliance for 4 to 6 months.

        4. Using of class ΙΙ intra-oral elastics for both sides for 2 to 3 months.

        5. Finally follow finishing steps for each patient.

      Observations:

      Changes in the condylar volume and changes in position of the condyle in relation to glenoid
      fossa as a result of remodeling process before and after the fixed functional orthopedic
      treatment at each group.
    

Intervention name(s): Herbst Group; TFBC Group
Intervention type(s): Device; Device
Intervention description(s): Two mini plates are chosen, the last hole in every plate is used to solder the ball housing of type IV Herbst appliance.
The two mini plates are placed bilateral at the mandibular symphysis and fixed by at least 3 screws, the surgical wound is sutured leaving an extended part of the plate in the oral cavity which contain the soldered ball housing.
The surgical wound is left for 2 weeks for proper soft tissue healing, in the meantime separation in the arch, band placement on the first premolar and molar bilateral followed by impression for construction of the upper Herbst splint.
Cementation of upper Herbst splint with connecting the telescopic piston through fitting of the plunger into the tube bilaterally.
When reactivation of the telescopic piston is needed, extension rings are used.; The patients will be treated by fixed orthodontic appliance with using series of orthodontic NiTi arch wires for levelling and alignment.
Installation of series of orthodontic stainless steel arch wires until 0.0019 x 0.0025 inch for both arches.
Installation of the Twin Force Bite Corrector appliance for 4 to 6 months.
Using of class ΙΙ intra-oral elastics for both sides for 2 to 3 months.
Finally follow finishing steps for each patient.
Other intervention name(s): Group I; Group II
Allocation: Randomized
Intervention model: Parallel Assignment
Intervention model description: Participants will be selected based on the following inclusion criteria:
Skeletal class 2 malocclusion due to mandibular retrusion with increased overjet (SNA= 82±4, ANB=≥4°). With agefrom 18 to 25 years.
Mandibular arch with minimum (up to 4mm) or no crowding.
All permanent teeth are erupted (3rd molar not included).
Good oral and general health.
No systemic disease or regular medication that could interfere and/or affect orthodontic teeth movement.
No previous orthodontic treatment.
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary purpose: Treatment