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Profile changes of patients treated with and without premolar extractions.
Am J Orthod Dentofacial Orthop. 2007 Sep; 132(3):324-31.AJ

Abstract

INTRODUCTION

In this study, we evaluated and compared treatment effects and long-term soft-tissue profile changes in patients treated with extraction of 4 first premolars and with a nonextraction protocol.

METHODS

Cephalometric records of 98 patients were evaluated. For half (n = 49) of the patients, treatment included the extraction of 4 first premolars; the other 49 patients had no premolar extractions. The groups were evaluated before treatment (T1), at the end of treatment (T2), and at least 4 years postretention (T3).

RESULTS

At T1, the extraction group had more protrusive lower lips than the nonextraction group, as measured by the Z-angle. At T2, the Z-angles had improved in both groups and were not significantly different. During treatment, upper lip vermilion and superior thicknesses increased, whereas lower lip vermilion thickness decreased in both groups. Except for lower lip inferior thickness, which increased significantly in the nonextraction group, no other soft-tissue differences were significant. Significant growth of the nose occurred during from T1 to T2 in both groups, and there was a tendency for the incisors in both groups to return to pretreatment values. The nose also continued to grow during that period.

CONCLUSIONS

Overall, the soft-tissue facial profile measurements for both extraction and nonextraction samples were similar at T3, and there were no clinically significant correlations between hard- and soft-tissue variables at T1, T2, and T3.

Authors+Show Affiliations

Department of Orthodontics, Faculty of Dentistry, University of Ege, Ege, Turkey.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Evaluation Study
Journal Article

Language

eng

PubMed ID

17826600

Citation

Erdinc, Aslihan Ertan, et al. "Profile Changes of Patients Treated With and Without Premolar 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. 132, no. 3, 2007, pp. 324-31.
Erdinc AE, Nanda RS, Dandajena TC. Profile changes of patients treated with and without premolar extractions. Am J Orthod Dentofacial Orthop. 2007;132(3):324-31.
Erdinc, A. E., Nanda, R. S., & Dandajena, T. C. (2007). Profile changes of patients treated with and without premolar 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, 132(3), 324-31.
Erdinc AE, Nanda RS, Dandajena TC. Profile Changes of Patients Treated With and Without Premolar Extractions. Am J Orthod Dentofacial Orthop. 2007;132(3):324-31. PubMed PMID: 17826600.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Profile changes of patients treated with and without premolar extractions. AU - Erdinc,Aslihan Ertan, AU - Nanda,Ram S, AU - Dandajena,Tarisai C, PY - 2005/04/23/received PY - 2005/07/29/revised PY - 2005/08/17/accepted PY - 2007/9/11/pubmed PY - 2007/9/26/medline PY - 2007/9/11/entrez SP - 324 EP - 31 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 - 132 IS - 3 N2 - INTRODUCTION: In this study, we evaluated and compared treatment effects and long-term soft-tissue profile changes in patients treated with extraction of 4 first premolars and with a nonextraction protocol. METHODS: Cephalometric records of 98 patients were evaluated. For half (n = 49) of the patients, treatment included the extraction of 4 first premolars; the other 49 patients had no premolar extractions. The groups were evaluated before treatment (T1), at the end of treatment (T2), and at least 4 years postretention (T3). RESULTS: At T1, the extraction group had more protrusive lower lips than the nonextraction group, as measured by the Z-angle. At T2, the Z-angles had improved in both groups and were not significantly different. During treatment, upper lip vermilion and superior thicknesses increased, whereas lower lip vermilion thickness decreased in both groups. Except for lower lip inferior thickness, which increased significantly in the nonextraction group, no other soft-tissue differences were significant. Significant growth of the nose occurred during from T1 to T2 in both groups, and there was a tendency for the incisors in both groups to return to pretreatment values. The nose also continued to grow during that period. CONCLUSIONS: Overall, the soft-tissue facial profile measurements for both extraction and nonextraction samples were similar at T3, and there were no clinically significant correlations between hard- and soft-tissue variables at T1, T2, and T3. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/17826600/Profile_changes_of_patients_treated_with_and_without_premolar_extractions_ DB - PRIME DP - Unbound Medicine ER -