Evaluation of the Effects of Asymmetric Premolar Extraction Treatment on Arch Form and Symmetry

Year 2023, Volume: 2 Issue: 3, 120 - 129, 30.12.2023

Eylül Polatcan Kılıç Esra Bolat Gümüş

Abstract

Abstract:
Objectives: The study aimed to evaluate the effects of different extraction protocols on arch form and symmetry.
Material and Methods: In this retrospective dental cast study, participants included 86 patients with a mean age of 14, 6 (± 2, 3) years. Our study groups were: asymmetric extraction (first premolar on one side and second premolar on the opposite side); unilateral extraction (one-sided first premolar); bilateral extraction (first premolar on both sides).Upper and lower dental casts were evaluated separately, based on previously noted extraction protocols. Consequently, 115 upper and lower dental casts were selected among the 172 dental casts of 86 patients. All measurements were performed digitally.The median palatal suture and the anterior reference plane were used as the primary planes for digital model analysis.Cephalometric analyses of dental measurements were also performed.
Results: The bilateral extraction protocol resulted in a statistically significant decrease in transverse-direction asymmetry in the anterior region of the lower jaw. Due to unilateral extraction, an increase in anteroposterior asymmetry was observed in the posterior region of the upper jaw, whereas in the lower jaw, asymmetry was decreased for the same parameter (p<0.05).
Conclusions: Asymmetric and bilateral extraction protocols reduced the asymmetry of the arch length in the upper jaw. The effects of asymmetric and bilateral extraction protocols on arch asymmetry were found to be similar. While these extraction protocols do not generally cause a significant change in arch asymmetry, in some cases, they had a positive effect on reducing asymmetry. The unilateral extraction protocol had an increased effect on arch length asymmetry.

Keywords

dental arch, asymmetry, tooth extraction, orthodontic treatment

Asimetrik Premolar Çekimli Ortodontik Tedavilerin Ark Formu ve Simetrisi Üzerine Etkilerinin Değerlendirilmesi

Abstract

Amaç: Bu çalışmanın amacı farklı çekim protokollerinin ark formu ve simetrisi üzerine etkilerinin değerlendirilmesidir.
Materyal ve Metod: Bu retrospektif model çalışmasında, katılımcılar yaş ortalaması 14,6 (± 2,3) yıl olan 86 hasta idi. Çalışma gruplarımız: asimetrik çekim (bir tarafta birinci premolar ve karşı tarafta ikinci premolar); tek taraflı çekim (tek taraflı birinci premolar); çift taraflı çekim (her iki tarafta birinci premolar) şeklindeydi. Üst ve alt dental modeller; önceden belirlenmiş çekim protokollerine dayanarak ayrı ayrı değerlendirildi. Sonuç olarak, 86 hastaya ait 172 dental modelden 115 üst ve alt model seçildi. Tüm ölçümler dijital olarak yapıldı. Median palatal sutur ve anterior referans düzlemi, dijital model analizi için temel düzlemler olarak kullanıldı. Dişsel ölçümlerin sefalometrik analizleri de yapıldı.
Bulgular: İki taraflı çekim protokolü, alt çenenin ön bölgesinde transversal yönde asimetrinin istatistiksel olarak azalmasına neden oldu. Tek taraflı çekim sonucunda ise üst çenenin arka bölgesinde anteroposterior asimetrinin arttığı gözlendi, bu arada alt çenede aynı parametre için asimetrinin azaldığı belirlendi (p<0.05).
Sonuç: Asimetrik ve çift taraflı çekim protokolleri üst çenenin ark uzunluğundaki asimetrinin azalmasına neden olurken; ark asimetrisi üzerindeki etkilerinin benzer olduğu bulundu. Bu çekim protokolleri genellikle ark asimetrisinde önemli bir değişikliğe neden olmasa da, bazı durumlarda asimetrinin azalmasında olumlu etkileri olduğu izlendi. Tek taraflı çekim protokolünün ise ark uzunluğu asimetrisi üzerinde arttırıcı bir etkisi bulunmaktadır

Keywords

dental ark, asimetri, diş çekimi, ortodontik tedavi

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