Analysis of the Dentoskeletal Effects of the Expander With Differential Opening

Analysis of the Dentoskeletal Effects of the Expander With Differential Opening: a Randomized Clinical Trial

This study evaluates the dentoskeletal effects of the expander with differential opening in orthodontic patients in the mixed dentition. Half of participants will undergo rapid maxillary expansion (RME) using the expander with differential opening, while the other half will undergo RME using the conventional Hyrax expander.

Study Overview

• Status: Unknown
• Conditions: Maxillary Constriction; Unilateral Posterior Crossbite; Bilateral Posterior Crossbite; Mandibular Dental Arch Constriction
• Intervention / Treatment: Device: Differential rapid maxillary expansion; Device: Conventional rapid maxillary expansion

Detailed Description

Recently, a rapid maxillary expander with differential opening was developed aiming to treat maxillary constrictions greater in the anterior region compared to the posterior region of the maxillary dental arch. The aim of this study is to evaluate the dentoskeletal effects of the expander with differential opening in orthodontic patients in the mixed dentition. Material and methods: Fifty patients with maxillary constriction in the mixed dentition will be prospectively and randomly allocated in one of two study groups. The experimental group will comprise 25 patients who will be submitted to rapid maxillary expansion with the expander with differential opening. The control group will be comprised by 25 individuals who will undergo rapid maxillary expander with the Hyrax expander. Digital dental models will be acquired immediately pre-expansion (T1) and six months post-expansion (T2). The Orthoanalyzer™ software will be used to measure maxillary and mandibular widths, arches perimeter, arches lengths, palatal depth, and inclinations of maxillary and mandibular canines and permanent first molars. The intergroup and interphase comparisons will be analyzed using t tests and paired t tests, respectively (p<0.05).

• Study Type: Interventional
• Enrollment (Anticipated): 50
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Brazil
  • São Paulo
    • Bauru, São Paulo, Brazil, 17012059
      • Recruiting
      • University of Sao Paulo
      • Contact: Arthur Alves, DDS, MSc; Phone Number: +55 14 981060878; Email: arthurcesar_88@hotmail.com

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 7 years to 11 years (Child)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Both sexes;
• Ages ranging from 7 to 11 years old;
• Mixed dentition;
• Maxillary constriction;
• No previous orthodontic treatment.

Exclusion Criteria:

• Cleft lip and palate and associated syndromes;
• Systemic and/or neurological diseases.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Expander with differential opening group; The experimental group will comprise 25 patients who will be submitted to rapid maxillary expansion using the expander with differential opening. The expander will be composed by two 11-mm screws, one anteriorly and the other posteriorly positioned on the palate (Great lakes Orthodontics Ltd, NY, EUA).	Device: Differential rapid maxillary expansion; Twenty-five patients will be submitted to rapid maxillary expansion using the expander with differential opening. Appliance anchorage will be provided by bands adapted either on the maxillary first permanent molars or on the second deciduous molars and circumferential clamps will be bonded to the maxillary deciduous canines. If the maxillary second deciduous molars will be banded, a lingual extension wire will be placed in the partially erupted maxillary first permanent molars. Both anterior and posterior screws will be activated with a complete turn a day during 6 days. Then, only the anterior screw will be additionally activated for 4 more days. After the active period of RME, the screws will be fixed with acrylic resin and the appliance will be kept as a retainer for 6 months.; Other Names: RME with the expander with differential opening
Active Comparator: Hyrax group; The control group will be comprised by 25 patients who will undergo rapid maxillary expansion using the conventional Hyrax expander. The expander will be composed by one 11-mm screw centrally positioned on the palate (Dentaurum, Ispringen, Germany).	Device: Conventional rapid maxillary expansion; Twenty-five patients will undergo rapid maxillary expansion using conventional Hyrax expander. Bands will be adapted either on the maxillary first permanent molars or on second deciduous molars and circumferential clamps will be bonded to the maxillary deciduous canines. Similarly to the experimental group, a lingual extension wire will be placed in the partially erupted maxillary first permanent molars if the maxillary second deciduous molars will be banded. The expander screw will be activated with a complete turn a day during 6 days. After the expansion active phase, the screw will be fixed with acrylic resin and the appliance will be kept in the dental arch as a retainer for 6 months.; Other Names: RME with the conventional Hyrax expander

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Maxillary and mandibular inter-first permanent molar distances	6 months
Maxillary and mandibular inter-second deciduous molar distances	6 months
Maxillary and mandibular inter-first deciduous molar distances	6 months
Maxillary and mandibular inter-deciduous canine distances	6 months
Maxillary and mandibular dental arches perimeters	6 months
Maxillary and mandibular dental arches lengths	6 months
Palatal depth	6 months
Inclination of maxillary and mandibular first permanent molars	6 months
Inclination of maxillary and mandibular deciduous canines	6 months
Amount of interincisor diastema	10 days

Secondary Outcome Measures

Outcome Measure	Time Frame
Amount of differential expansion on the maxillary and mandibular dental arches	6 months

Collaborators and Investigators

• Sponsor: University of Sao Paulo
• Investigators: Principal Investigator: Arthur Alves, DDS, MSc, Bauru Dental School, University of São Paulo

Study record dates

Study Major Dates

• Study Start: May 1, 2015
• Primary Completion (Anticipated): December 1, 2016
• Study Completion (Anticipated): February 1, 2018

Study Registration Dates

• First Submitted: June 18, 2016
• First Submitted That Met QC Criteria: June 18, 2016
• First Posted (Estimate): June 22, 2016

Study Record Updates

• Last Update Posted (Estimate): June 22, 2016
• Last Update Submitted That Met QC Criteria: June 18, 2016
• Last Verified: June 1, 2016

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Stomatognathic Diseases; Pathological Conditions, Anatomical; Tooth Diseases; Malocclusion; Constriction, Pathologic
• Other Study ID Numbers: Bauru Dental School, USP

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No