Skeletal and Dental Changes with Hyrax-type Rapid Maxillary Expander Anchored to Permanent Versus Deciduous Molars

University Hospital, Montpellier34 enrolled

Overview

The aim of the study is to compare the skeletal and dental maxillary expansion obtained with an Hyrax tooth-borne expander anchored either on the 2nd deciduous molars (V) or on the 1st permanent molars (6). The main objective is to compare at the skeletal level the distance between the cephalometric points, right jugal (RJ) and left jugal (JR) (maxillary base). The secondaries objectives are performed at the dental level by measuring the distance between the maxillary first molars mesio-palatal cusp and the cuspids cups. Molar derotation is also assessed

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

DIAGNOSTIC

Masking

NONE

Enrollment

Conditions

Maxillary Hypoplasia

Interventions

Experimental groupDEVICE

The experimental group will have a hyrax rapid maxillary expander anchored on the 2nd deciduous molars (V)

Control groupDEVICE

The control group will have a hyrax rapid maxillary expander anchored on the 1st permanent molars (6)

Eligibility

Sex: ALLMin age: 6 YearsMax age: 12 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Patient coming to the dental clinic for a first orthodontic consultation in mixed dentition * Patient aged 6 to 12 years * Patient with a transverse maxillary deficiency requiring rapid maxillary expansion * Presence of 1st permanent molars "6" and 2nd deciduous "V" molars with sufficient root length Exclusion Criteria: * Syndromic patients (all syndromes combined: cleft lip, etc.) * Patient with V or 6 with decays (or with major root resorption) * Patient with oral hygiene non compatible with orthodontic treatment * Failure to obtain informed written consent * No affiliation to a French national medical health system * Patient with a legal protection measure

Locations (1)

Centre de Soins Dentaires

Montpellier, France

Outcomes

Primary Outcomes

Difference in skeletal maxillary width before/ after rapid maxillary expansion

Difference in skeletal maxillary width measured on frontal cephs (distance between the cephalometric points "right jugal RJ" and "left jugal JR" of the Ricketts analysis) before (V0)/after (V8) rapid maxillary expansion with tooth-borne expander type Hyrax

Time frame: 6 months

Secondary Outcomes

Difference of the inter-molar distance before/after

Difference before (V0) / after (V8) rapid maxillary expansion with tooth-borne expander type Hyrax of the inter-molar distance (mesiopalatal cusp) assessed on dental casts

Time frame: 6 months

Difference of the inter-canine distance before/after

Difference before (V0) / after (V8) rapid maxillary expansion with tooth-borne expander type Hyrax of the inter-canine distance (cuspids cusp) assessed on dental casts

Time frame: 6 months

Difference in the amount of molar derotation (inter-molar angle) before/after

Difference before (V0) / after (V8) rapid maxillary expansion with tooth-borne expander type Hyrax in the amount of molar derotation (inter-molar angle) assessed on dental casts

Time frame: 6 months

Inter-operator reproducibility

Inter-operator reproducibility assessed by the intra-class correlation coefficient

Time frame: 1 month

Data from ClinicalTrials.gov

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