Skeletal and dental response to rapid maxillary expansion with 2- versus 4-band appliances

Banding a rapid palatal expansion (RPE) appliance to the 2 first molars has been proposed as an equivalent to the conventional 4-band RPE appliance. However, the dentoskeletal response to this treatment has not been evaluated. Twenty-eight subjects (aged 8-20 years) who required maxillary expansion...

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Published in:American journal of orthodontics and dentofacial orthopedics 2005-04, Vol.127 (4), p.483-492
Main Authors: Davidovitch, Moshe, Efstathiou, Stathis, Sarne, Ofer, Vardimon, Alexander D
Format: Article
Language:English
Subjects:
Adolescent
Adult
Age Factors
Cephalometry - statistics & numerical data
Child
Dental Arch - anatomy & histology
Dentistry
Female
Humans
Male
Maxilla - anatomy & histology
Molar - physiopathology
Orthodontic Appliance Design
Orthodontic Appliances
Palatal Expansion Technique - instrumentation
Palate, Hard - anatomy & histology
Statistics, Nonparametric
Treatment Outcome
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Summary:Banding a rapid palatal expansion (RPE) appliance to the 2 first molars has been proposed as an equivalent to the conventional 4-band RPE appliance. However, the dentoskeletal response to this treatment has not been evaluated. Twenty-eight subjects (aged 8-20 years) who required maxillary expansion were matched by age and randomly assigned to either a 2-band or a 4-band RPE group. Skeletal and dental responses were measured from standardized anteroposterior cephalometric and occlusal radiographs and dental casts before treatment (T1), at the end of expansion (T2), and at 1 year postexpansion (T3). At T2, suture expansion was 2.5 times greater and arch perimeter was 6-fold larger in the 4-band than in the 2-band group. Both appliances displayed the typical "V" expansion of the suture and "reverse V" expansion of the dental arch. At T3, remineralization reduced the suture opening by 75%, but 95% to 99% of the dental reaction was maintained. The 2-band group demonstrated a significant inverse age-dependent correlation ( r = -0.795), with treatment failure beyond 12 years of age, whereas the 4-band group was age-independent. The greater the skeletal resistance, the smaller the sutural response but the greater the dental response to RPE therapy. Four-band RPE is indicated when severe anterior crowding is accompanied by a tapered arch form, and 2-band RPE is recommended in the mixed dentition when mild crowding occurs with posterior constriction.
ISSN:0889-5406
DOI:10.1016/j.ajodo.2004.01.021