Dental and Medical Problems

Dent Med Probl
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ISSN 1644-387X (print)
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Dental and Medical Problems

2020, vol. 57, nr 3, July-September, p. 275–283

doi: 10.17219/dmp/119102

Publication type: original article

Language: English

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Creative Commons BY-NC-ND 3.0 Open Access

Extraction versus non-extraction orthodontic treatment: Soft tissue profile changes in borderline class I patients

Ekstrakcyjne a nieekstrakcyjne leczenie ortodontyczne – zmiany profilu tkanek miękkich u pacjentów z wątpliwą klasą I

Sepideh Soheilifar1,A,F, Sanaz Soheilifar2,B, Hooman Ataei2,B, Vahid Mollabashi1,B, Payam Amini3,C, Anahita Bakhshaei4,D, Navid Naghdi5,E

1 Department of Orthodontics, Dental Research Center, Hamadan University of Medical Sciences, Iran

2 Private practice, Hamadan, Iran

3 Department of Biostatistics and Epidemiology, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Iran

4 Department of Orthodontics, Faculty of Dentistry, Hamadan University of Medical Sciences, Iran

5 Department of Oral and Maxillofacial Surgery, Implant Research Center, Hamadan University of Medical Sciences, Iran


Background. The decision regarding the selection of extraction or non-extraction orthodontic treatment is a common challenge in orthodontic treatment planning.
Objectives. The objective of this study was to compare the effects of extraction and non-extraction orthodontic treatment on the soft tissue profile of borderline class I patients.
Material and Methods. In this retrospective study, 70 patients were selected from among those referred to the Department of Orthodontics of the Faculty of Dentistry at Hamadan University of Medical Sciences in Iran. The inclusion criteria were skeletal class I, 4–10 mm of space deficiency, and the possibility of applying both extraction and non-extraction orthodontic treatment. All patients underwent fixed orthodontic treatment with the use of 0.022-inch-slot edgewise brackets. The patients were divided into 2 groups (n = 35) according to the 4-premolar extraction or non-extraction treatment plan. The 2 groups were compared by means of the cephalometric analysis.
Results. There were 11 males and 24 females at a mean age of 17.46 years in the non-extraction group, and 9 males and 26 females at a mean age of 18.46 years in the extraction group. The upper and lower incisors as well as the lower lip moved forward in the non-extraction group (lower lip to E‑plane = 0.87 ±1.39 mm, U1–SN = 2.83 ±8.03°, IMPA = 4.64 ±5.47°). The incisors and the lips moved backward in the extraction group (upper lip to E‑plane = −1.42 ±2.08 mm, lower lip to E‑plane = −1.56 ±1.97 mm, U1–SN = −7.63 ±9.02°, IMPA = −7.05 ±6.79°). The differences were statistically significant (p < 0.05). Mentolabial sulcus became more pronounced in the non-extraction group (1.92 ±2.73 mm; p < 0.001) and shallower in the extraction group (−1.90 ±4.2 mm; p = 0.000).
Conclusion. Orthodontic treatment can change the soft tissue appearance of the lower third of the face. The lips and the incisors moved forward in the non-extraction group and backward in the extraction group.

Key words

tooth extraction, orthodontics, cephalometry, Angle class I malocclusion

Słowa kluczowe

ekstrakcja zęba, ortodoncja, cefalometria, wada zgryzu klasy I wg Angle’a

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