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Treatment effects and short-term relapse of maxillomandibular expansion during the early to mid mixed dentition.
Am J Orthod Dentofacial Orthop 2007; 131(4):456-63AJ

Abstract

INTRODUCTION

The treatment effects and the short-term (0.9 +/- 0.45 years) relapse potential of phase I slow maxillary expansion, with a bonded palatal expander or a quad-helix appliance combined with a mandibular banded Crozat/lip bumper and followed by 12 to 15 months of retention, were examined.

METHODS

Pretreatment (8.8 +/- 1.7 years) and posttreatment (11.1 +/- 1.7 years) models of 54 patients were used to evaluate treatment effects. Posttreatment (11.0 +/- 1.3 years) and follow-up (11.9 +/- 1.4 years) models of 23 patients who returned for phase II treatment were used to evaluate relapse over the 11 months, during which no retention was used. The models were digitized, and 15 measures were computed.

RESULTS

Significant treatment increases were observed for all measurements in both arches. Treatment gains in arch perimeter (6%-8%) were due more to increases in intermolar width (11%-15%) than to increases in arch depth (5%). Posttreatment relapse was significant (P <.05) for all measures except mandibular intercanine width and maxillary molar arch depth. After accounting for normal growth, net changes (pretreatment to follow-up) indicated significant increases for all measures except maxillary molar arch depth. In addition to maintaining leeway space, the maxilla and the mandible showed net perimeter gains of 2.9 and 1.0 mm, respectively.

CONCLUSIONS

Slow maxillary expansion combined with a mandibular banded Crozat/lip bumper during the early mixed dentition produced clinically useful increases in arch dimensions that subsequently underwent mild-to-moderate amounts of relapse after removal of all retention appliances.

Authors+Show Affiliations

Department of Orthodontics, Baylor College of Dentistry, Texas A&M University System, Dallas, Tex 75246, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Studies
Journal Article

Language

eng

PubMed ID

17418711

Citation

Vargo, Julie, et al. "Treatment Effects and Short-term Relapse of Maxillomandibular Expansion During the Early to Mid Mixed Dentition." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 131, no. 4, 2007, pp. 456-63.
Vargo J, Buschang PH, Boley JC, et al. Treatment effects and short-term relapse of maxillomandibular expansion during the early to mid mixed dentition. Am J Orthod Dentofacial Orthop. 2007;131(4):456-63.
Vargo, J., Buschang, P. H., Boley, J. C., English, J. D., Behrents, R. G., & Owen, A. H. (2007). Treatment effects and short-term relapse of maxillomandibular expansion during the early to mid mixed dentition. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 131(4), pp. 456-63.
Vargo J, et al. Treatment Effects and Short-term Relapse of Maxillomandibular Expansion During the Early to Mid Mixed Dentition. Am J Orthod Dentofacial Orthop. 2007;131(4):456-63. PubMed PMID: 17418711.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Treatment effects and short-term relapse of maxillomandibular expansion during the early to mid mixed dentition. AU - Vargo,Julie, AU - Buschang,Peter H, AU - Boley,Jimmy C, AU - English,Jeryl D, AU - Behrents,Rolf G, AU - Owen,Albert H,3rd PY - 2005/02/01/received PY - 2005/06/01/revised PY - 2005/06/01/accepted PY - 2007/4/10/pubmed PY - 2007/4/25/medline PY - 2007/4/10/entrez SP - 456 EP - 63 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 131 IS - 4 N2 - INTRODUCTION: The treatment effects and the short-term (0.9 +/- 0.45 years) relapse potential of phase I slow maxillary expansion, with a bonded palatal expander or a quad-helix appliance combined with a mandibular banded Crozat/lip bumper and followed by 12 to 15 months of retention, were examined. METHODS: Pretreatment (8.8 +/- 1.7 years) and posttreatment (11.1 +/- 1.7 years) models of 54 patients were used to evaluate treatment effects. Posttreatment (11.0 +/- 1.3 years) and follow-up (11.9 +/- 1.4 years) models of 23 patients who returned for phase II treatment were used to evaluate relapse over the 11 months, during which no retention was used. The models were digitized, and 15 measures were computed. RESULTS: Significant treatment increases were observed for all measurements in both arches. Treatment gains in arch perimeter (6%-8%) were due more to increases in intermolar width (11%-15%) than to increases in arch depth (5%). Posttreatment relapse was significant (P <.05) for all measures except mandibular intercanine width and maxillary molar arch depth. After accounting for normal growth, net changes (pretreatment to follow-up) indicated significant increases for all measures except maxillary molar arch depth. In addition to maintaining leeway space, the maxilla and the mandible showed net perimeter gains of 2.9 and 1.0 mm, respectively. CONCLUSIONS: Slow maxillary expansion combined with a mandibular banded Crozat/lip bumper during the early mixed dentition produced clinically useful increases in arch dimensions that subsequently underwent mild-to-moderate amounts of relapse after removal of all retention appliances. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/17418711/Treatment_effects_and_short_term_relapse_of_maxillomandibular_expansion_during_the_early_to_mid_mixed_dentition_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(06)01566-6 DB - PRIME DP - Unbound Medicine ER -