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Comparative Study
. 2010 May;80(3):485-91.
doi: 10.2319/062709-359.1.

Treatment effects of twin-block and mandibular protraction appliance-IV in the correction of class II malocclusion

Ashok Kumar Jena  1 , Ritu Duggal
Affiliations
Comparative Study

Treatment effects of twin-block and mandibular protraction appliance-IV in the correction of class II malocclusion

Ashok Kumar Jena et al. Angle Orthod. 2010 May.

Abstract

Objective: To evaluate the treatment effects of twin-block and Mandibular Protraction Appliance-IV (MPA-IV) in the treatment of Class II division 1 malocclusion.

Methods: Fifty North Indian girls with Class II division 1 malocclusion, in the age range of 9-13 years, were chosen. The subjects were divided among a control group (n = 10), a twin-block group (n = 25), and an MPA group (n = 15). Pre-follow-up and post-follow-up lateral cephalograms of control subjects and pretreatment and posttreatment lateral cephalograms of the treatment subjects were traced manually and subjected to a pitchfork analysis.

Results: Neither twin-block nor MPA-IV significantly restricted the forward growth of maxilla. Mandibular growth and improvement in the sagittal skeletal relation were significantly greater in the twin-block subjects. Distal movement of the maxillary dentition and mesial movement of the mandibular dentition were more prominent in the MPA-IV subjects. Molar correction and overjet reductions were significantly greater in the treatment subjects (P < .001).

Conclusion: Twin-block and MPA-IV were effective in correcting the molar relationships and reducing the overjet in Class II division 1 malocclusion subjects. However, twin-block contributed more skeletal effects than MPA-IV for the correction of Class II malocclusion.

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Figures

Figure 1
Figure 1
The Pitchfork diagram. Cranial base indicates base of the cranium; maxilla, maxillary change in relation to the cranial base; mandible, mandibular change in relation to the cranial base; ABCH, antero-posterior change in the relationship between maxilla and mandible; total U6, total upper molar movement; total L6, total lower molar movement; total molar, ABCH + total U6 + total L6, the change in molar relationship; total U1, total upper incisor movement; total L1, total lower incisor movement; overjet, ABCH + total U1 + total L1, the change in incisor relationship.
Figure 2
Figure 2
Pitchfork changes in the control group.
Figure 3
Figure 3
Pitchfork changes in the twin-block group.
Figure 4
Figure 4
Pitchfork changes in the mandibular protraction appliance group.
Figure 5
Figure 5
Comparison of skeletal changes among the three groups.
Figure 6
Figure 6
Comparison of dental changes among three groups.
See this image and copyright information in PMC

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