Maxillary Hypoplasia
Conditions
Keywords
Orthodontic appliances, Orthodontic interceptive, Palatal expansion technique, Child, Dentition mixed, Tooth deciduous, Rapid maxillary expansion
Brief summary
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)
Detailed description
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
Interventions
DEVICEExperimental group
The experimental group will have a hyrax rapid maxillary expander anchored on the 2nd deciduous molars (V)
DEVICEControl group
The control group will have a hyrax rapid maxillary expander anchored on the 1st permanent molars (6)
Sponsors
University Hospital, Montpellier
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
DIAGNOSTIC
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
6 Years to 12 Years
Healthy volunteers
No
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Difference in skeletal maxillary width before/ after rapid maxillary expansion | 6 months | 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 |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Difference of the inter-molar distance before/after | 6 months | 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 |
| Difference of the inter-canine distance before/after | 6 months | 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 |
| Difference in the amount of molar derotation (inter-molar angle) before/after | 6 months | 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 |
| Inter-operator reproducibility | 1 month | Inter-operator reproducibility assessed by the intra-class correlation coefficient |
Countries
France
Outcome results
None listed