The Use of an Esthetic Twin Block for Patients With Mandibular Retrusion
Condition: Class II Malocclusion
MeSH terms: Malocclusion; Malocclusion, Angle Class II; Overbite
Study type: Interventional

Summary: 
      This experimental study will evaluate the effect of an esthetic Twin-block appliance on the
      correction of class II malocclusion compared with the traditional Twin-block appliance.

      The study sample will consist of 50 patients with class II malocclusion. The sample will be
      allocated randomly into two groups: the control group and the experimental group.

      The traditional Twin-block appliance will be applied for the control group patients, while
      the esthetic Twin-block appliance will be applied for the experimental group patients. The
      dentoskeletal, soft tissue changes and esthetic and functional efficacy occurring after
      functional treatment will be assessed using cephalometric radiographs and profile
      photographs, pre and post-treatment, and a questionnaire. Changes for each group will be
      evaluated individually, and the two groups will be compared.
    

Detailed description: 
      Class II malocclusion is one of the most frequent orthodontic problems, and most class II
      malocclusion cases are the result of mandibular deficiency. Twin block (TB) is one of the
      most popular functional appliances to treat this condition. Despite excellent treatment
      results with TB, its acceptance and compliance may be hampered by its wiry structure and
      appearance. Furthermore, it has a side effect of causing the proclination of lower incisors,
      which reduces skeletal change. Various modifications were proposed to reduce lower incisors
      proclination but had no significant effect. Patient cooperation is one of the most important
      factors for successful functional appliance treatment, and it depends upon comfort and
      esthetic acceptability, which ensures good patient compliance. so, in order to enhance the
      esthetic appearance and overcome the disadvantages of a conventional Twin-Block (CTB), a
      novel esthetic Twin-Block (ETB) was fabricated from a specific material using a pressure
      molding device and acrylic bite blocks. There is only one study that evaluated this appliance
      which is a pilot study that compared the treatment effects of the (ETB) and (CTB) in the
      treatment of Class II malocclusions. However, this study has a lot of limitations, making it
      difficult to evaluate this appliance's efficiency accurately. The aim of this study is to
      study the dento-skeletal, soft tissue changes, and esthetic and functional efficacy that
      result from treatment by this appliance (ETB) and to compare them to the changes in the
      matched group will be treated with (CTB), by studying the cephalometric radiographs, profile
      photographs, and a questionnaire.
    

Intervention name(s): CTB; ETB
Intervention type(s): Device; Device
Intervention description(s): conventional Twin-block (CTB) will be comprised of maxillary and mandibular removable appliances having the labial bows, adam's clasps, and with no incisal capping.; will be comprised of maxillary and mandibular removable 1.5-mm biocryl sheet will be adapted separately on maxillary and mandibular casts with help of vacuum machine, and Acrylic bite blocks with the inclined plane will be fabricated on biocryl sheets sim
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: Single (Outcomes Assessor)
Primary purpose: Treatment
Keywords: Class II; Twin Block; Functional Therapy