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The short-term treatment effects of face mask therapy in Class III patients based on the anchorage device: miniplates vs rapid maxillary expansion.
Angle Orthod. 2012 Sep; 82(5):846-52.AO

Abstract

OBJECTIVE

To compare the short-term treatment effects of face mask therapy with miniplates (FM-MP) and face mask therapy with rapid maxillary expansion appliance (FM-RME) in growing Class III malocclusion patients with maxillary hypoplasia.

MATERIALS AND METHODS

Twenty patients were allocated into two groups according to the anchorage device: FM-MP group (n = 10; mean age = 11.2 ± 1.2 years; miniplates in the zygomatic buttress area) and FM-RME group (n = 10; mean age = 10.7 ± 1.3 years; bonded or banded RME). The face mask was applied for 12 to 14 hours/day in both groups with a force of 400 g/side directed 30° downward and forward from the occlusal plane. Lateral cephalograms were taken before (T1) and after FM-MP or FM-RME therapy (T2). Skeletodental and soft-tissue variables were measured. Paired and independent t-tests were performed for statistical analysis.

RESULTS

Both groups exhibited significant forward movement of point A and posterior repositioning and opening rotation of the mandible from T2 to T1. The FM-MP group showed significant protraction of orbitale (ΔSNO), and the FM-RME group showed a decrease in overbite and an increase in Björk sum. Comparing the amount of changes between the two groups, the FM-MP group displayed greater forward movement of the maxilla than the FM-RME group (ΔSNA, ΔA to N perp, all P < .05). However, the FM-RME group exhibited a greater opening rotation of the mandible (ΔSNB, Björk sum, all P < .01; ΔPog to N-perp, P < .05) and labioversion of the maxillary incisors (ΔU1-FH, P < .05).

CONCLUSION

FM-MP therapy induces a greater advancement of the maxilla, less posterior repositioning and opening rotation of the mandible, and less proclination of the maxillary incisors than FM-RME therapy.

Authors+Show Affiliations

Department of Orthodontics, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-Do, Korea.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

22264134

Citation

Lee, Nam-Ki, et al. "The Short-term Treatment Effects of Face Mask Therapy in Class III Patients Based On the Anchorage Device: Miniplates Vs Rapid Maxillary Expansion." The Angle Orthodontist, vol. 82, no. 5, 2012, pp. 846-52.
Lee NK, Yang IH, Baek SH. The short-term treatment effects of face mask therapy in Class III patients based on the anchorage device: miniplates vs rapid maxillary expansion. Angle Orthod. 2012;82(5):846-52.
Lee, N. K., Yang, I. H., & Baek, S. H. (2012). The short-term treatment effects of face mask therapy in Class III patients based on the anchorage device: miniplates vs rapid maxillary expansion. The Angle Orthodontist, 82(5), 846-52. https://doi.org/10.2319/090811-584.1
Lee NK, Yang IH, Baek SH. The Short-term Treatment Effects of Face Mask Therapy in Class III Patients Based On the Anchorage Device: Miniplates Vs Rapid Maxillary Expansion. Angle Orthod. 2012;82(5):846-52. PubMed PMID: 22264134.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The short-term treatment effects of face mask therapy in Class III patients based on the anchorage device: miniplates vs rapid maxillary expansion. AU - Lee,Nam-Ki, AU - Yang,Il-Hyung, AU - Baek,Seung-Hak, Y1 - 2012/01/20/ PY - 2012/1/24/entrez PY - 2012/1/24/pubmed PY - 2013/5/4/medline SP - 846 EP - 52 JF - The Angle orthodontist JO - Angle Orthod VL - 82 IS - 5 N2 - OBJECTIVE: To compare the short-term treatment effects of face mask therapy with miniplates (FM-MP) and face mask therapy with rapid maxillary expansion appliance (FM-RME) in growing Class III malocclusion patients with maxillary hypoplasia. MATERIALS AND METHODS: Twenty patients were allocated into two groups according to the anchorage device: FM-MP group (n = 10; mean age = 11.2 ± 1.2 years; miniplates in the zygomatic buttress area) and FM-RME group (n = 10; mean age = 10.7 ± 1.3 years; bonded or banded RME). The face mask was applied for 12 to 14 hours/day in both groups with a force of 400 g/side directed 30° downward and forward from the occlusal plane. Lateral cephalograms were taken before (T1) and after FM-MP or FM-RME therapy (T2). Skeletodental and soft-tissue variables were measured. Paired and independent t-tests were performed for statistical analysis. RESULTS: Both groups exhibited significant forward movement of point A and posterior repositioning and opening rotation of the mandible from T2 to T1. The FM-MP group showed significant protraction of orbitale (ΔSNO), and the FM-RME group showed a decrease in overbite and an increase in Björk sum. Comparing the amount of changes between the two groups, the FM-MP group displayed greater forward movement of the maxilla than the FM-RME group (ΔSNA, ΔA to N perp, all P < .05). However, the FM-RME group exhibited a greater opening rotation of the mandible (ΔSNB, Björk sum, all P < .01; ΔPog to N-perp, P < .05) and labioversion of the maxillary incisors (ΔU1-FH, P < .05). CONCLUSION: FM-MP therapy induces a greater advancement of the maxilla, less posterior repositioning and opening rotation of the mandible, and less proclination of the maxillary incisors than FM-RME therapy. SN - 1945-7103 UR - https://www.unboundmedicine.com/medline/citation/22264134/The_short_term_treatment_effects_of_face_mask_therapy_in_Class_III_patients_based_on_the_anchorage_device:_miniplates_vs_rapid_maxillary_expansion_ L2 - https://meridian.allenpress.com/angle-orthodontist/article-lookup/doi/10.2319/090811-584.1 DB - PRIME DP - Unbound Medicine ER -