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Maxillary sinus floor extension and posterior tooth inclination in adolescent patients with Class II Division 1 malocclusion treated with maxillary first molar extractions.
Am J Orthod Dentofacial Orthop. 2013 Apr; 143(4):479-85.AJ

Abstract

INTRODUCTION

Our objective was to investigate potential associations between maxillary sinus floor extension and inclination of maxillary second premolars and second molars in patients with Class II Division 1 malocclusion whose orthodontic treatment included maxillary first molar extractions.

METHODS

The records of 37 patients (18 boys, 19 girls; mean age, 13.2 years; SD, 1.62 years) treated between 1998 and 2004 by 1 orthodontist with full Begg appliances were used in this study. Inclusion criteria were white patients with Class II Division 1 malocclusion, sagittal overjet of ≥4 mm, treatment plan including extraction of the maxillary first permanent molars, no missing teeth, and no agenesis. Maxillary posterior tooth inclination and lower maxillary sinus area in relation to the palatal plane were measured on lateral cephalograms at 3 time points: at the start and end of treatment, and on average 2.5 years posttreatment. Data were analyzed for the second premolar and second molar inclinations by using mixed linear models.

RESULTS

The analysis showed that the second molar inclination angle decreased by 7° after orthodontic treatment, compared with pretreatment values, and by 11.5° at the latest follow-up, compared with pretreatment. There was evidence that maxillary sinus volume was negatively correlated with second molar inclination angle; the greater the volume, the smaller the inclination angle. For premolars, inclination increased by 15.4° after orthodontic treatment compared with pretreatment, and by 8.1° at the latest follow-up compared with baseline. The volume of the maxillary sinus was not associated with premolar inclination.

CONCLUSIONS

We found evidence of an association between maxillary second molar inclination and surface area of the lower sinus in patients treated with maxillary first molar extractions. Clinicians who undertake such an extraction scheme in Class II patients should be aware of this potential association and consider appropriate biomechanics to control root uprighting.

Authors+Show Affiliations

Department of Orthodontics, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands. c.livas@umcg.nlNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

23561408

Citation

Livas, Christos, et al. "Maxillary Sinus Floor Extension and Posterior Tooth Inclination in Adolescent Patients With Class II Division 1 Malocclusion Treated With Maxillary First Molar Extractions." 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. 143, no. 4, 2013, pp. 479-85.
Livas C, Halazonetis DJ, Booij JW, et al. Maxillary sinus floor extension and posterior tooth inclination in adolescent patients with Class II Division 1 malocclusion treated with maxillary first molar extractions. Am J Orthod Dentofacial Orthop. 2013;143(4):479-85.
Livas, C., Halazonetis, D. J., Booij, J. W., Pandis, N., Tu, Y. K., & Katsaros, C. (2013). Maxillary sinus floor extension and posterior tooth inclination in adolescent patients with Class II Division 1 malocclusion treated with maxillary first molar extractions. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 143(4), 479-85. https://doi.org/10.1016/j.ajodo.2012.10.024
Livas C, et al. Maxillary Sinus Floor Extension and Posterior Tooth Inclination in Adolescent Patients With Class II Division 1 Malocclusion Treated With Maxillary First Molar Extractions. Am J Orthod Dentofacial Orthop. 2013;143(4):479-85. PubMed PMID: 23561408.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Maxillary sinus floor extension and posterior tooth inclination in adolescent patients with Class II Division 1 malocclusion treated with maxillary first molar extractions. AU - Livas,Christos, AU - Halazonetis,Demetrios J, AU - Booij,Johan Willem, AU - Pandis,Nikolaos, AU - Tu,Yu-Kang, AU - Katsaros,Christos, PY - 2012/07/01/received PY - 2012/10/01/revised PY - 2012/10/01/accepted PY - 2013/4/9/entrez PY - 2013/4/9/pubmed PY - 2013/6/19/medline SP - 479 EP - 85 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 - 143 IS - 4 N2 - INTRODUCTION: Our objective was to investigate potential associations between maxillary sinus floor extension and inclination of maxillary second premolars and second molars in patients with Class II Division 1 malocclusion whose orthodontic treatment included maxillary first molar extractions. METHODS: The records of 37 patients (18 boys, 19 girls; mean age, 13.2 years; SD, 1.62 years) treated between 1998 and 2004 by 1 orthodontist with full Begg appliances were used in this study. Inclusion criteria were white patients with Class II Division 1 malocclusion, sagittal overjet of ≥4 mm, treatment plan including extraction of the maxillary first permanent molars, no missing teeth, and no agenesis. Maxillary posterior tooth inclination and lower maxillary sinus area in relation to the palatal plane were measured on lateral cephalograms at 3 time points: at the start and end of treatment, and on average 2.5 years posttreatment. Data were analyzed for the second premolar and second molar inclinations by using mixed linear models. RESULTS: The analysis showed that the second molar inclination angle decreased by 7° after orthodontic treatment, compared with pretreatment values, and by 11.5° at the latest follow-up, compared with pretreatment. There was evidence that maxillary sinus volume was negatively correlated with second molar inclination angle; the greater the volume, the smaller the inclination angle. For premolars, inclination increased by 15.4° after orthodontic treatment compared with pretreatment, and by 8.1° at the latest follow-up compared with baseline. The volume of the maxillary sinus was not associated with premolar inclination. CONCLUSIONS: We found evidence of an association between maxillary second molar inclination and surface area of the lower sinus in patients treated with maxillary first molar extractions. Clinicians who undertake such an extraction scheme in Class II patients should be aware of this potential association and consider appropriate biomechanics to control root uprighting. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/23561408/Maxillary_sinus_floor_extension_and_posterior_tooth_inclination_in_adolescent_patients_with_Class_II_Division_1_malocclusion_treated_with_maxillary_first_molar_extractions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(13)00009-7 DB - PRIME DP - Unbound Medicine ER -