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Soft tissue, skeletal and dentoalveolar changes following conventional anchorage molar distalization therapy in class II non-growing subjects: a multicentric retrospective study.
Prog Orthod. 2012 May; 13(1):30-41.PO

Abstract

OBJECTIVES

The purpose of this retrospective prolective study is to evaluate soft tissue, dentoalveolar and skeletal vertical changes following conventional anchorage molar distalization therapy in adult patients.

MATERIALS AND METHODS

Forty-six patients (34 females, mean age 25 years 6 months; and 12 males, mean age 28 years 4 months) were recruited from 4 specialists Board Certified. All subjects underwent molar distalization therapy according different distalization mechanics. Cephalometric headfilms were available for all subjects before (T0) and at the end of comprehensive treatment (T1). The initial and final measurements and treatment changes were compared by means of a paired t-test or a paired Wilcoxon test.

RESULTS

Mean total treatment time was 3 years 3 months ± 8 months. Maxillary first and second molars distalized 2.16±0.84 mm and 2.01±0.69 mm respectively, but also maintained a slight distal tipping of 1.45° (min 2.22°, max -6.45°) and 3.35° (min 0.47°, max -15.48°) at the end of treatment. Distal movement of maxillary first molar contributed 57.6% to molar correction, and 42.4% was due to a mesial movement of mandibular first molar (1.59±0.46 mm). Dentoalveolar changes contributed to overjet correction; maxillary incisors retroclined 5.78°±3.17°, lower incisors proclined 7.49°±4.52° and occlusal plane rotated down and backward 2.32°±2.10°. A significant clockwise rotation of the mandible (1.97°±1.32°) and a significant increase in lower facial height (3.35±1.48) mm were observed. Upper lip slightly retruded (-1.76±1.70 mm) and lower lip protruded (0.96±0.99 mm) but these changes had a negligible impact on clinical appearance.

CONCLUSIONS

Although maxillary molar distalization therapy can be performed in adult patients, significant proclination of the lower incisors, clockwise rotation of the occlusal plane and increase in vertical facial dimension should be expected. Nevertheless, in absence of maxillary third molars and in presence of mandibular third molars this procedure could be recommended.

Authors+Show Affiliations

maurocozzani@gmail.comNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article
Multicenter Study

Language

eng

PubMed ID

22583585

Citation

Fontana, Mattia, et al. "Soft Tissue, Skeletal and Dentoalveolar Changes Following Conventional Anchorage Molar Distalization Therapy in Class II Non-growing Subjects: a Multicentric Retrospective Study." Progress in Orthodontics, vol. 13, no. 1, 2012, pp. 30-41.
Fontana M, Cozzani M, Caprioglio A. Soft tissue, skeletal and dentoalveolar changes following conventional anchorage molar distalization therapy in class II non-growing subjects: a multicentric retrospective study. Prog Orthod. 2012;13(1):30-41.
Fontana, M., Cozzani, M., & Caprioglio, A. (2012). Soft tissue, skeletal and dentoalveolar changes following conventional anchorage molar distalization therapy in class II non-growing subjects: a multicentric retrospective study. Progress in Orthodontics, 13(1), 30-41. https://doi.org/10.1016/j.pio.2011.07.002
Fontana M, Cozzani M, Caprioglio A. Soft Tissue, Skeletal and Dentoalveolar Changes Following Conventional Anchorage Molar Distalization Therapy in Class II Non-growing Subjects: a Multicentric Retrospective Study. Prog Orthod. 2012;13(1):30-41. PubMed PMID: 22583585.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Soft tissue, skeletal and dentoalveolar changes following conventional anchorage molar distalization therapy in class II non-growing subjects: a multicentric retrospective study. AU - Fontana,Mattia, AU - Cozzani,Mauro, AU - Caprioglio,Alberto, Y1 - 2011/09/14/ PY - 2011/06/30/received PY - 2011/07/20/revised PY - 2011/07/21/accepted PY - 2012/5/16/entrez PY - 2012/5/16/pubmed PY - 2012/10/25/medline SP - 30 EP - 41 JF - Progress in orthodontics JO - Prog Orthod VL - 13 IS - 1 N2 - OBJECTIVES: The purpose of this retrospective prolective study is to evaluate soft tissue, dentoalveolar and skeletal vertical changes following conventional anchorage molar distalization therapy in adult patients. MATERIALS AND METHODS: Forty-six patients (34 females, mean age 25 years 6 months; and 12 males, mean age 28 years 4 months) were recruited from 4 specialists Board Certified. All subjects underwent molar distalization therapy according different distalization mechanics. Cephalometric headfilms were available for all subjects before (T0) and at the end of comprehensive treatment (T1). The initial and final measurements and treatment changes were compared by means of a paired t-test or a paired Wilcoxon test. RESULTS: Mean total treatment time was 3 years 3 months ± 8 months. Maxillary first and second molars distalized 2.16±0.84 mm and 2.01±0.69 mm respectively, but also maintained a slight distal tipping of 1.45° (min 2.22°, max -6.45°) and 3.35° (min 0.47°, max -15.48°) at the end of treatment. Distal movement of maxillary first molar contributed 57.6% to molar correction, and 42.4% was due to a mesial movement of mandibular first molar (1.59±0.46 mm). Dentoalveolar changes contributed to overjet correction; maxillary incisors retroclined 5.78°±3.17°, lower incisors proclined 7.49°±4.52° and occlusal plane rotated down and backward 2.32°±2.10°. A significant clockwise rotation of the mandible (1.97°±1.32°) and a significant increase in lower facial height (3.35±1.48) mm were observed. Upper lip slightly retruded (-1.76±1.70 mm) and lower lip protruded (0.96±0.99 mm) but these changes had a negligible impact on clinical appearance. CONCLUSIONS: Although maxillary molar distalization therapy can be performed in adult patients, significant proclination of the lower incisors, clockwise rotation of the occlusal plane and increase in vertical facial dimension should be expected. Nevertheless, in absence of maxillary third molars and in presence of mandibular third molars this procedure could be recommended. SN - 2196-1042 UR - https://www.unboundmedicine.com/medline/citation/22583585/Soft_tissue_skeletal_and_dentoalveolar_changes_following_conventional_anchorage_molar_distalization_therapy_in_class_II_non_growing_subjects:_a_multicentric_retrospective_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1723-7785(11)00048-4 DB - PRIME DP - Unbound Medicine ER -