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Effect of early treatment on stability of occlusion in patients with Class II malocclusion.
Am J Orthod Dentofacial Orthop. 2008 Feb; 133(2):235-44.AJ

Abstract

INTRODUCTION

The purpose of this study was to evaluate the effect of early treatment on the stability of occlusion in patients with Class II malocclusions. The peer assessment rating (PAR) index was used to evaluate changes in occlusion after treatment of subjects treated in 1 phase or 2 phases. This study was a prospective, randomized, controlled clinical trial.

METHODS

Dental casts were obtained from the participants, who were randomized into 3 phase-1 early treatment groups: bionator, headgear/bite plane, or observation. Phase 2 consisted of continued treatment of the bionator and the headgear/biteplane subjects and comprehensive treatment of the observation subjects. PAR scores were obtained for 208 subjects at end of treatment; 173 (83%) had at least 1 follow-up visit, with a median follow-up time of 5.0 years. PAR scores were calculated for each subject at key treatment and posttreatment time points. Linear mixed-effect models were used to evaluate the impact of phase-1 treatment group, years posttreatment, end of treatment PAR score, and other covariates that could affect stability on the posttreatment PAR score.

RESULTS

Factors significantly affecting posttreatment PAR scores were PAR score at end of treatment (P <.0001), years posttreatment (P =.0064), and PAR score at the start of phase 2. Although phase-1 treatment was not statistically significant, those with early treatment had lower PAR scores at the start of phase 2 than the observation subjects (means [SD]: bionator 17.5 [7.4], headgear/biteplane 15.3 [7.0], observation 22.2 [8.6], P <.0001). Thus, early treatment had an indirect effect.

CONCLUSIONS

Factors that affect posttreatment PAR score stability include PAR score at the end of treatment, years posttreatment, and PAR score at the start of phase-2 treatment. The early treatment modalities have limited positive impact on posttreatment stability PAR scores in Class II malocclusion patients due to their effect on PAR scores at the start of phase-2 treatment.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

18249290

Citation

Pavlow, Sarah S., et al. "Effect of Early Treatment On Stability of Occlusion in Patients With Class II Malocclusion." 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. 133, no. 2, 2008, pp. 235-44.
Pavlow SS, McGorray SP, Taylor MG, et al. Effect of early treatment on stability of occlusion in patients with Class II malocclusion. Am J Orthod Dentofacial Orthop. 2008;133(2):235-44.
Pavlow, S. S., McGorray, S. P., Taylor, M. G., Dolce, C., King, G. J., & Wheeler, T. T. (2008). Effect of early treatment on stability of occlusion in patients with Class II malocclusion. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 133(2), 235-44. https://doi.org/10.1016/j.ajodo.2006.02.038
Pavlow SS, et al. Effect of Early Treatment On Stability of Occlusion in Patients With Class II Malocclusion. Am J Orthod Dentofacial Orthop. 2008;133(2):235-44. PubMed PMID: 18249290.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of early treatment on stability of occlusion in patients with Class II malocclusion. AU - Pavlow,Sarah S, AU - McGorray,Susan P, AU - Taylor,Marie G, AU - Dolce,Calogero, AU - King,Gregory J, AU - Wheeler,Timothy T, PY - 2005/09/28/received PY - 2006/02/09/revised PY - 2006/02/17/accepted PY - 2008/2/6/pubmed PY - 2008/2/20/medline PY - 2008/2/6/entrez SP - 235 EP - 44 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 - 133 IS - 2 N2 - INTRODUCTION: The purpose of this study was to evaluate the effect of early treatment on the stability of occlusion in patients with Class II malocclusions. The peer assessment rating (PAR) index was used to evaluate changes in occlusion after treatment of subjects treated in 1 phase or 2 phases. This study was a prospective, randomized, controlled clinical trial. METHODS: Dental casts were obtained from the participants, who were randomized into 3 phase-1 early treatment groups: bionator, headgear/bite plane, or observation. Phase 2 consisted of continued treatment of the bionator and the headgear/biteplane subjects and comprehensive treatment of the observation subjects. PAR scores were obtained for 208 subjects at end of treatment; 173 (83%) had at least 1 follow-up visit, with a median follow-up time of 5.0 years. PAR scores were calculated for each subject at key treatment and posttreatment time points. Linear mixed-effect models were used to evaluate the impact of phase-1 treatment group, years posttreatment, end of treatment PAR score, and other covariates that could affect stability on the posttreatment PAR score. RESULTS: Factors significantly affecting posttreatment PAR scores were PAR score at end of treatment (P <.0001), years posttreatment (P =.0064), and PAR score at the start of phase 2. Although phase-1 treatment was not statistically significant, those with early treatment had lower PAR scores at the start of phase 2 than the observation subjects (means [SD]: bionator 17.5 [7.4], headgear/biteplane 15.3 [7.0], observation 22.2 [8.6], P <.0001). Thus, early treatment had an indirect effect. CONCLUSIONS: Factors that affect posttreatment PAR score stability include PAR score at the end of treatment, years posttreatment, and PAR score at the start of phase-2 treatment. The early treatment modalities have limited positive impact on posttreatment stability PAR scores in Class II malocclusion patients due to their effect on PAR scores at the start of phase-2 treatment. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/18249290/Effect_of_early_treatment_on_stability_of_occlusion_in_patients_with_Class_II_malocclusion_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(07)01105-5 DB - PRIME DP - Unbound Medicine ER -