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Randomized Controlled Trial
. 2015 Mar;85(2):284-91.
doi: 10.2319/031114-176.1. Epub 2014 Jul 14.

Comparison of the effects of face mask treatment started simultaneously and after the completion of the alternate rapid maxillary expansion and constriction procedure

Bilge H Canturk  1 , Mevlut Celikoglu
Affiliations
Randomized Controlled Trial

Comparison of the effects of face mask treatment started simultaneously and after the completion of the alternate rapid maxillary expansion and constriction procedure

Bilge H Canturk et al. Angle Orthod. 2015 Mar.

Abstract

Objective: To test the null hypothesis that there were significant differences for skeletal, dentoalveolar, and soft tissue changes induced by face mask (FM) started simultaneously and after an alternate rapid maxillary expansion and constriction (Alt-RAMEC) procedure.

Materials and methods: Thirty-six patients with Class III malocclusion due to maxillary deficiency were randomly assigned to Group I (FM started after the completion of the Alt-RAMEC) and Group II (FM started simultaneously with the Alt-RAMEC). The screw of the RME appliance was alternately activated and deactivated twice daily (0.20 mm per turn) for 1 week over the course of 8 weeks. The changes observed in both groups were assessed using the cephalometric lateral films and statistically evaluated using the paired t-test and Student's t-test.

Results: Thirty patients completed the present prospective study. No significant differences were observed between the groups. Class III malocclusion and negative overjet were improved by means of skeletal changes in conjunction with upper incisor proclination in both groups. Skeletal contribution to overjet correction in Groups I and II was 91.70% and 86.10%, respectively. Maxilla showed a forward movement of 3.84 mm and 3.02 mm in Groups I and II, respectively.

Conclusions: The null hypothesis was rejected. Both groups showed similar results, and, thus, waiting until completion of the Alt-RAMEC procedure for the FM treatment is not necessary.

Keywords: Alt-RAMEC; Class III; Face mask; Maxillary protraction.

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Figures

Figure 1. Intraoral photographs of a patient's (A) RME appliance and (B) lingual arch.
Figure 1.
Intraoral photographs of a patient's (A) RME appliance and (B) lingual arch.
Figure 2. Extraoral photograph of the Petit-type face mask used in the study.
Figure 2.
Extraoral photograph of the Petit-type face mask used in the study.
Figure 3. Flow diagram of the study.
Figure 3.
Flow diagram of the study.
Figure 4. Angular measurements used in the study (°): (1) SNA, (2) SNB, (3) ANB, (4) Convexity, (5) SN-GoMe, (6) SN-PP, (7) SN-OP, (8) U1-SN, (9) IMPA, (10) U1-L1, and (11) Gl-Sn-Pog (soft).
Figure 4.
Angular measurements used in the study (°): (1) SNA, (2) SNB, (3) ANB, (4) Convexity, (5) SN-GoMe, (6) SN-PP, (7) SN-OP, (8) U1-SN, (9) IMPA, (10) U1-L1, and (11) Gl-Sn-Pog (soft).
Figure 5. Linear measurements used in the study (mm): (1) Co-A, (2) A-VRL, (3) A-HRL, (4) Co-Gn, (5) B-VRL, (6) Pog-VRL, (7) Pog-HRL, (8) S-Go, (9) N-Me, (10) U6-VRL, (11) L6-VRL, (12) Wits, (13) overbite, (14) overjet, (15) Ls-VRL, (16) Li-VRL, and (17) Pog (soft)-VRL.
Figure 5.
Linear measurements used in the study (mm): (1) Co-A, (2) A-VRL, (3) A-HRL, (4) Co-Gn, (5) B-VRL, (6) Pog-VRL, (7) Pog-HRL, (8) S-Go, (9) N-Me, (10) U6-VRL, (11) L6-VRL, (12) Wits, (13) overbite, (14) overjet, (15) Ls-VRL, (16) Li-VRL, and (17) Pog (soft)-VRL.
Figure 6. Skeletal and dental contributions to overjet correction in both groups.
Figure 6.
Skeletal and dental contributions to overjet correction in both groups.
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References

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