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Skeletal and dentoalveolar effects of Twin-block and bionator appliances in the treatment of Class II malocclusion: a comparative study.
Am J Orthod Dentofacial Orthop. 2006 Nov; 130(5):594-602.AJ

Abstract

INTRODUCTION

The purpose of this study was to evaluate the skeletal and dentoalveolar effects of the Twin-block and bionator appliances in the treatment of Class II Division 1 malocclusions.

METHODS

Fifty-five girls from North India with Class II Division 1 malocclusion and the same physical growth maturation status were selected for the study. The subjects were divided among a Twin-block group (n = 25), a bionator group (n = 20), and a control group (n = 10). Pretreatment and posttreatment lateral cephalometric radiographs of the treatment group subjects, and prefollow-up and postfollow-up radiographs of the control group subjects, were traced manually and subjected to the pitchfork analysis.

RESULTS

Statistical software was used for 1-way analysis of variance and multiple comparisons (post-hoc test, Bonferroni). A P value of .05 was considered statistically significant. Neither the Twin-block nor the bionator appliance significantly restricted forward growth of the maxilla (P = .476). Mandibular growth in the Twin-block subjects was significantly greater than in controls (P = .005). Mandibular growth was comparable in the control and the bionator subjects. Molar correction, overjet reduction, and proclination of the mandibular incisors were significantly greater (P = .000) in the treated subjects compared with the controls.

CONCLUSIONS

Both the Twin-block and bionator appliances were effective in correcting molar relationships and reducing overjets in Class II Division 1 malocclusion subjects. However, the Twin-block was more efficient than the bionator in the treatment of Class II Division 1 malocclusion.

Authors+Show Affiliations

Division of Orthodontics, Department of Dental Surgery, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India.No affiliation info availableNo affiliation info available

Pub Type(s)

Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

17110256

Citation

Jena, Ashok Kumar, et al. "Skeletal and Dentoalveolar Effects of Twin-block and Bionator Appliances in the Treatment of Class II Malocclusion: a Comparative Study." 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. 130, no. 5, 2006, pp. 594-602.
Jena AK, Duggal R, Parkash H. Skeletal and dentoalveolar effects of Twin-block and bionator appliances in the treatment of Class II malocclusion: a comparative study. Am J Orthod Dentofacial Orthop. 2006;130(5):594-602.
Jena, A. K., Duggal, R., & Parkash, H. (2006). Skeletal and dentoalveolar effects of Twin-block and bionator appliances in the treatment of Class II malocclusion: a comparative study. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 130(5), 594-602.
Jena AK, Duggal R, Parkash H. Skeletal and Dentoalveolar Effects of Twin-block and Bionator Appliances in the Treatment of Class II Malocclusion: a Comparative Study. Am J Orthod Dentofacial Orthop. 2006;130(5):594-602. PubMed PMID: 17110256.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Skeletal and dentoalveolar effects of Twin-block and bionator appliances in the treatment of Class II malocclusion: a comparative study. AU - Jena,Ashok Kumar, AU - Duggal,Ritu, AU - Parkash,Hari, PY - 2004/08/24/received PY - 2004/11/17/revised PY - 2005/02/14/accepted PY - 2006/11/18/pubmed PY - 2006/12/9/medline PY - 2006/11/18/entrez SP - 594 EP - 602 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 - 130 IS - 5 N2 - INTRODUCTION: The purpose of this study was to evaluate the skeletal and dentoalveolar effects of the Twin-block and bionator appliances in the treatment of Class II Division 1 malocclusions. METHODS: Fifty-five girls from North India with Class II Division 1 malocclusion and the same physical growth maturation status were selected for the study. The subjects were divided among a Twin-block group (n = 25), a bionator group (n = 20), and a control group (n = 10). Pretreatment and posttreatment lateral cephalometric radiographs of the treatment group subjects, and prefollow-up and postfollow-up radiographs of the control group subjects, were traced manually and subjected to the pitchfork analysis. RESULTS: Statistical software was used for 1-way analysis of variance and multiple comparisons (post-hoc test, Bonferroni). A P value of .05 was considered statistically significant. Neither the Twin-block nor the bionator appliance significantly restricted forward growth of the maxilla (P = .476). Mandibular growth in the Twin-block subjects was significantly greater than in controls (P = .005). Mandibular growth was comparable in the control and the bionator subjects. Molar correction, overjet reduction, and proclination of the mandibular incisors were significantly greater (P = .000) in the treated subjects compared with the controls. CONCLUSIONS: Both the Twin-block and bionator appliances were effective in correcting molar relationships and reducing overjets in Class II Division 1 malocclusion subjects. However, the Twin-block was more efficient than the bionator in the treatment of Class II Division 1 malocclusion. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/17110256/Skeletal_and_dentoalveolar_effects_of_Twin_block_and_bionator_appliances_in_the_treatment_of_Class_II_malocclusion:_a_comparative_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(06)00892-4 DB - PRIME DP - Unbound Medicine ER -