Three-dimensional evaluation of dentoskeletal changes after posterior cross-bite correction by quad-helix or removable appliances.
Br J Orthod
; 19(2): 97-107, 1992 May.
Article
in En
| MEDLINE
| ID: mdl-1627533
ABSTRACT
The aim of the study was to evaluate in a three-dimensional manner the dentoskeletal changes after slow maxillary expansion. The sample consisted of 34 children with a unilateral, symmetrical posterior cross-bite. Half of the children were treated with a quad-helix and the rest with a removable appliance. Assessment of the changes was made with study casts, and frontal and lateral cephalograms, before treatment, at the end of the expansion, after a retention period of 3 months, and after a post-retention period of 3 months. The results showed that sufficient expansion of the dental arches took place in both groups. The expansion expressed in the molar region in the quad-helix group was mostly due to buccal translation of the teeth and in the removable appliance group due to buccal tipping. The quad-helix group showed somewhat greater basal expansion than the removable appliance group, though the basal expansion in both groups was rather small. A tendency towards an increase of the NL/ML angle characterized the removable appliance group, but the opposite pattern was present in the quad-helix group.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Orthodontic Appliances, Removable
/
Tooth
/
Activator Appliances
/
Palatal Expansion Technique
/
Facial Bones
/
Malocclusion
Type of study:
Diagnostic_studies
/
Evaluation_studies
Limits:
Child
/
Female
/
Humans
/
Male
Language:
En
Journal:
Br J Orthod
Year:
1992
Document type:
Article
Affiliation country: