Changes Following the Treatment of Lower Jaw Protrusion Using Two Appliances

A Comparison of the Skeletal and Dento-alveolar Changes After Treatment of Class III Malocclusion With a Modified Tandem Appliance Versus the Face Mask

An in vivo study evaluating the efficacy of the Tandem appliance in the treatment of maxillary deficiency in growing patients compared to the conventional facemask appliance treatment. Pre-treatment and post-treatment lateral cephalograms will be taken. Dentofacial, sagittal and vertical skeletal measurements will be taken at three assessment times. Changes within each group will be assessed. In addition, the changes between the two groups will be compared.

Study Overview

• Status: Completed
• Conditions: Class III Malocclusion in Growing Patients
• Intervention / Treatment: Device: Tandem Appliance

Detailed Description

Maxillary deficiency or retrusion is generally accepted as one of the most difficult and complex orthodontic anomalies to diagnose and treat. Facemask therapy is usually preferred for the treatment of subjects with skeletal and dental Class III malocclusions with a retruded maxilla, and it is known that if the patient is sufficiently motivated to wear a facemask, this type of therapy is quite successful. patient compliance required during facemask therapy due to its poor aesthetics and intraoral appliances for Class III malocclusion treatment such as the Fränkel III , bionator III don't give treatment goals .Hybrid appliance tandem traction bow appliance (TTBA)is introduced by Chun et al. 1999 , as a more aesthetic, effective and comfortable device. Klempner, 2003 modified tandem appliance and published two case reports suggested that TTBA and modified applications have a similar treatment effect to that of an expander-facemask combination(2). A review of the literature showed that there were no statistical studies documenting the effects of modified tandem appliance comparing to traditional expander-facemask therapy and these are the investigators study purposes.

Study design: patients aged between 8-10 with anterior cross bite will be selected from orthodontic department in faculty of dentistry in Damascus university. Pretreatment cephalometric radiography will be taken. Subjects follow inclusion criteria (Skeletal Class III (ANB < 0 degree), due to maxillary retrusion, or a combination of maxillary retrusion and mandibular protrusion, Angle Class III malocclusion with an anterior crossbite., an optimum SN/GoGn angle between 26 and 38 degrees ,fully erupted maxillary incisors,,no congenitally missing teeth or congenital syndromes such as a cleft lip/palate will be . Patient will divided to two group tandem group and face mask group depended on growth pattern. Where from patients in face mask group have normal or horizontal growth pattern,tandem group have vertical one.

Appliance Design The Tandem Appliance comprises three separate components,two fixed and one removable. The upper section is a fixed McNamara expander with buccal arms soldered for attachment of protraction elastics. The lower section is consist of two bands with buccal headgear tubes and buccolingual welded arch for support . Third one is head-gear facebow inserted into the lower tubes and the outer bows bent out for elastics attachment. At the beginning of treatment, patients or Panther are instructed to wear the appliance with light, 8oz /14-16/ hours a day training elastics from the outer face-bow to the buccal arms of the upper expander. Subsequently, heavy orthopedic traction with 14oz /14-16/ hours a day,elastics effectively delivers the protraction force to the maxilla. Lateral cephalometric radiographs without the expander will be taken after a Class I molar relationship and a minimum overjet of 2 mm is obtained. Pre-treatment and post-treatment lateral cephalmetric dentofacial , sagittal and vertical skeletal parameters will be retraced by the author . Statistical analysis will be undertaken using the Statistical Package for Social Sciences, Windows version 19.0 (SPSS Inc., Chicago, Illinois, USA) Paired t-test will be used to evaluate the treatment effects and changes in same group. In depended t-test will be used to evaluate the treatment effects I between groups. confidence level 95% (P< 0.05).

• Study Type: Interventional
• Enrollment (Actual): 30
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Syrian Arab Republic
  • Damascus, Syrian Arab Republic, DM20AM18
    • Department of Orthodontics, University of Damascus Dental School

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 8 years to 10 years (Child)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

1. Skeletal Class III (ANB angle < 0 degree) with due to maxillary retrusion, or a combination of maxillary retrusion and mandibular protrusion.
2. Angle Class III malocclusion with an anterior crossbite.
3. An optimum SN/GoGn angle (between 26 and 38 degrees).
4. Fully erupted maxillary incisors.

Exclusion Criteria:

1. Congenitally missing teeth or congenital syndromes such as a cleft lip/palate
2. History of previous orthodontic treatment

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Tandem Appliance; This group of patients will receive the new appliance which is called the Tandem Appliance	Device: Tandem Appliance; We are going to use a modified version of the Tandem Appliance
No Intervention: Traditional Treatment; Patients in this group will be treated by the traditional Face Mask appliance.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in the SNA angle	This variable is measured on the lateral cephalogram taken at two time points. This variable is used to give an information about the relative position of the upper jaw in relation to the anterior cranial base.	This variable will be measured twice: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment.
Change in the spatial position of Point A	Point A is defined as the point at the maximum concavity of the anterior upper alveolus (containing the upper incisors). The horizontal distance between Point A and the N-perpendicular will be also used to determine the antero-posterior positioning of Point A before and after treatment	This variable will be measured twice: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment.

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in the SNB angle	B is a point located on the mandible on the lateral cephalogram This point is used to determine the antero-posterior positioning of the mandible (lower jaw).	This variable will be measured twice: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment.
Change in the overjet value	Overjet is defined as the horizontal overlap between the upper an lower anterior teeth. This variable is going to be measured twice in order to see the changes that occurred in each group antero-posteriorly as a result of the provided orthodontic appliance.	This variable will be measured twice: (T1) baseline measurement at seven days before the beginning of treatment and (T2) at seven days following the end of treatment.

Collaborators and Investigators

• Sponsor: Damascus University
• Investigators: Principal Investigator: Amro Husson, DDS, MSc student, Department of Orthodontics, University of Damascus Dental School; Study Chair: Ahamd Burhan, DDS MSc PhD, Senior Lecturer in Orthodontics, University of Al-Baath Dental School, Hamah, Syria

Publications and helpful links

General Publications

• Atalay Z, Tortop T. Dentofacial effects of a modified tandem traction bow appliance. Eur J Orthod. 2010 Dec;32(6):655-61. doi: 10.1093/ejo/cjp153. Epub 2010 Mar 26.
• Chun YS, Jeong SG, Row J, Yang SJ. A new appliance for orthopedic correction of Class III malocclusion. J Clin Orthod. 1999 Dec;33(12):705-11. No abstract available.
• Klempner LS. Early orthopedic Class III treatment with a modified tandem appliance. J Clin Orthod. 2003 Apr;37(4):218-23; quiz 204. No abstract available.
• Klempner L. Early treatment of skeletal Class III open bite with the Tandem Appliance. J Clin Orthod. 2011 Jun;45(6):308-16; quiz 339. No abstract available.

Study record dates

Study Major Dates

• Study Start: May 1, 2014
• Primary Completion (Actual): March 1, 2015
• Study Completion (Actual): April 1, 2015

Study Registration Dates

• First Submitted: May 16, 2014
• First Submitted That Met QC Criteria: May 19, 2014
• First Posted (Estimate): May 22, 2014

Study Record Updates

• Last Update Posted (Estimate): April 21, 2015
• Last Update Submitted That Met QC Criteria: April 20, 2015
• Last Verified: April 1, 2015

More Information

Terms related to this study

• Keywords: Class III malocclusion; Maxillary protraction; Modified Tandem Appliance; Face mask therapy; Maxillary deficiency
• Additional Relevant MeSH Terms: Congenital Abnormalities; Musculoskeletal Diseases; Stomatognathic Diseases; Tooth Diseases; Stomatognathic System Abnormalities; Jaw Abnormalities; Jaw Diseases; Maxillofacial Abnormalities; Craniofacial Abnormalities; Musculoskeletal Abnormalities; Mandibular Diseases; Malocclusion; Prognathism; Malocclusion, Angle Class III
• Other Study ID Numbers: UDDS-Ortho-01-2014