Dental and skeletal changes after intraoral molar distalization with sectional jig assembly

The present study was conducted on 10 subjects to evaluate dental and skeletal changes after intraoral molar distalization. The maxillary molars were distalized with a sectional jig assembly. Sentalloy open coil springs were used to exert 150 gm of force for a period of 12 weeks. A modified Nance ap...

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Bibliographic Details
Published in:American journal of orthodontics and dentofacial orthopedics 1998-09, Vol.114 (3), p.319-327
Main Authors: Gulati, Sumit, Kharbanda, O.P., Parkash, Hari
Format: Article
Language:English
Subjects:
Adolescent
Cephalometry
Child
Dental Stress Analysis
Dentistry
Humans
Malocclusion - physiopathology
Malocclusion - therapy
Mandible - physiopathology
Maxilla
Maxillofacial Development
Molar
Nickel
Orthodontic Appliances
Rotation
Titanium
Tooth Movement Techniques - instrumentation
Tooth Movement Techniques - methods
Treatment Outcome
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Summary:The present study was conducted on 10 subjects to evaluate dental and skeletal changes after intraoral molar distalization. The maxillary molars were distalized with a sectional jig assembly. Sentalloy open coil springs were used to exert 150 gm of force for a period of 12 weeks. A modified Nance appliance was the main source of anchorage. The pre- and postdistalization records included dental study casts, clinical photographs, and cephalograms. A total of 665 readings recorded from lateral cephalograms and dental casts were subjected to statistical analysis. The mean distal movement of the first molar was 2.78 mm, which was highly significant ( p < 0.001). It moved distally at the rate of 0.86 mm/month. There was clinically some distal tipping (3.50°) and distopalatal rotation (2.40°). These changes were statistically significant ( p < 0.001). The second molars accompanied the first molars and moved distally by nearly the same amount. There was 1.00 mm increase in the overjet and 2.60° mesial tip of second premolar. The changes in the facial skeleton and dentition bases were minimal and statistically not significant. However, there was clockwise rotation of the mandible of 1.30° that was statistically significant. This was the result of molar extrusion (1.60 mm). (Am J Orthod Dentofacial Orthop 1998;114:319-27.)
ISSN:0889-5406
1097-6752
DOI:10.1016/S0889-5406(98)70215-X