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Comparative assessment of conventional and self-ligating appliances on the effect of mandibular intermolar distance in adolescent nonextraction patients: a single-center randomized controlled trial.
Am J Orthod Dentofacial Orthop. 2011 Sep; 140(3):e99-e105.AJ

Abstract

INTRODUCTION

Our aim in this study was to compare intermolar widths after alignment of crowded mandibular dental arches in nonextraction adolescent patients between conventional and self-ligating brackets.

METHODS

Fifty patients were included in this randomized controlled trial according to the following inclusion criteria: nonextraction treatment in both arches, eruption of all mandibular teeth, no spaces in the mandibular arch, mandibular irregularity index from canine to canine greater than 2 mm, and no therapeutic intervention planned involving intermaxillary or other intraoral or extraoral appliances including elastics before the end of the observation period. The patients were randomized into 2 groups: the first received a conventional appliance, and the other a passive self-ligating appliance, both with a 0.022-in slot. The amount of crowding of the mandibular dentition at baseline was assessed by using the irregularity index. Intermolar width was investigated with statistical methods of linear regression analysis. On an exploratory basis, the effect of appliance type on intercanine width was also assessed. Additionally, the effects of appliance type on time to alignment and crowding on time to alignment were assessed by using the Cox proportional hazards model.

RESULTS

No evidence of difference in intermolar width was found between the 2 bracket systems (β = 0.30; 95% CI, -0.3 to 0.9; P = 0.30). No evidence of difference in intercanine width was observed between the 2 bracket systems (β = 0.33; 95% CI, -0.8 to 0.1; P = 0.15). The time to reach alignment did not differ between appliance systems (hazard ratio, 0.68; 95% CI, 0.4 to 1.2; P = 0.21), whereas the amount of crowding was a significant predictor of the required time to reach alignment (hazard ratio, 0.88; 95% CI, 0.8 to 0.9; P = 0.02).

CONCLUSIONS

The use of conventional or self-ligating brackets does not seem to be an important predictor of mandibular intermolar width in nonextractions patients when the same wire sequence is used.

Authors+Show Affiliations

Department of Orthodontics and Dentofacial Orthopedics, Dental School Medical Faculty, University of Bern, Bern, Switzerland.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

21889063

Citation

Pandis, Nikolaos, et al. "Comparative Assessment of Conventional and Self-ligating Appliances On the Effect of Mandibular Intermolar Distance in Adolescent Nonextraction Patients: a Single-center Randomized Controlled Trial." 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. 140, no. 3, 2011, pp. e99-e105.
Pandis N, Polychronopoulou A, Katsaros C, et al. Comparative assessment of conventional and self-ligating appliances on the effect of mandibular intermolar distance in adolescent nonextraction patients: a single-center randomized controlled trial. Am J Orthod Dentofacial Orthop. 2011;140(3):e99-e105.
Pandis, N., Polychronopoulou, A., Katsaros, C., & Eliades, T. (2011). Comparative assessment of conventional and self-ligating appliances on the effect of mandibular intermolar distance in adolescent nonextraction patients: a single-center randomized controlled trial. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 140(3), e99-e105. https://doi.org/10.1016/j.ajodo.2011.03.019
Pandis N, et al. Comparative Assessment of Conventional and Self-ligating Appliances On the Effect of Mandibular Intermolar Distance in Adolescent Nonextraction Patients: a Single-center Randomized Controlled Trial. Am J Orthod Dentofacial Orthop. 2011;140(3):e99-e105. PubMed PMID: 21889063.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparative assessment of conventional and self-ligating appliances on the effect of mandibular intermolar distance in adolescent nonextraction patients: a single-center randomized controlled trial. AU - Pandis,Nikolaos, AU - Polychronopoulou,Argy, AU - Katsaros,Christos, AU - Eliades,Theodore, PY - 2010/10/01/received PY - 2011/03/01/revised PY - 2011/03/01/accepted PY - 2011/9/6/entrez PY - 2011/9/6/pubmed PY - 2011/10/25/medline SP - e99 EP - e105 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 - 140 IS - 3 N2 - INTRODUCTION: Our aim in this study was to compare intermolar widths after alignment of crowded mandibular dental arches in nonextraction adolescent patients between conventional and self-ligating brackets. METHODS: Fifty patients were included in this randomized controlled trial according to the following inclusion criteria: nonextraction treatment in both arches, eruption of all mandibular teeth, no spaces in the mandibular arch, mandibular irregularity index from canine to canine greater than 2 mm, and no therapeutic intervention planned involving intermaxillary or other intraoral or extraoral appliances including elastics before the end of the observation period. The patients were randomized into 2 groups: the first received a conventional appliance, and the other a passive self-ligating appliance, both with a 0.022-in slot. The amount of crowding of the mandibular dentition at baseline was assessed by using the irregularity index. Intermolar width was investigated with statistical methods of linear regression analysis. On an exploratory basis, the effect of appliance type on intercanine width was also assessed. Additionally, the effects of appliance type on time to alignment and crowding on time to alignment were assessed by using the Cox proportional hazards model. RESULTS: No evidence of difference in intermolar width was found between the 2 bracket systems (β = 0.30; 95% CI, -0.3 to 0.9; P = 0.30). No evidence of difference in intercanine width was observed between the 2 bracket systems (β = 0.33; 95% CI, -0.8 to 0.1; P = 0.15). The time to reach alignment did not differ between appliance systems (hazard ratio, 0.68; 95% CI, 0.4 to 1.2; P = 0.21), whereas the amount of crowding was a significant predictor of the required time to reach alignment (hazard ratio, 0.88; 95% CI, 0.8 to 0.9; P = 0.02). CONCLUSIONS: The use of conventional or self-ligating brackets does not seem to be an important predictor of mandibular intermolar width in nonextractions patients when the same wire sequence is used. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/21889063/Comparative_assessment_of_conventional_and_self_ligating_appliances_on_the_effect_of_mandibular_intermolar_distance_in_adolescent_nonextraction_patients:_a_single_center_randomized_controlled_trial_ DB - PRIME DP - Unbound Medicine ER -