Evaluation of the effect of upper first premolar extraction on maxillary and mandibular posterior space

Year 2023, Volume: 40 Issue: 2, 37 - 42, 02.05.2023

Hacı Fatih Ünver , Tuba Tortop

https://doi.org/10.17214/gaziaot.1099687

Abstract

Objective: To evaluate the effect of the upper first molar extraction on maxillary and mandibular posterior spaces.
Materials and Method: The material of the study consisted of lateral cephalometric radiographs of 20 individuals with dental Class II malocclusion who were treated with fixed appliances by extraction of the upper two premolars, before treatment (T1), after treatment (T2), and after retention (T3). On the lateral cephalometric radiographs, 7 dimensional and 4 angular measurements were performed by the same investigator. The Shapiro-Wilk test was used to determine whether the distribution of continuous numerical variables was close to normal. The statistical evaluations of the measurements were performed with Wilks' Lambda test for parametric variables and Friedman test for nonparametric variables. Multiple comparisons with Bonferroni correction or Dunn-Bonferroni post-hoc tests were done. A p value of <0.05 was considered statistically significant.
Results: The SNB angle increased significantly in T3 compared to T1 (p<0.05). The ANB angle decreased in T3 compared to T1 (p<0.05). The U1-NA distance decreased in both T2 and T3 compared to T1 (p<0.001). The U6-PTV distance increased significantly in both T2 and T3 compared to T1 and in T3 compared to T2 (p<0.001). The CLMD distance increased significantly in both T2 (p<0.01) and T3 (p<0.001) compared to T1 and in T3 compared to T2 (p<0.05). The DC distance increased in both T2 and T3 compared to T1 and in T3 compared to T2 (p<0.001). The CL1 distance significantly increased in T3 compared to T1 (p<0.05).
Conclusion: An increase was observed in the maxillary posterior space due to premolar extraction. The increase in the mandibular posterior space was less than that in the maxillary posterior space. Retraction of maxillary incisors and mesial movement of maxillary molars were observed.

Keywords

Posterior space, premolar extraction, Orthodontics

Üst birinci premolar çekiminin maksiller ve mandibular posterior boşluğa etkisinin değerlendirilmesi

Abstract

Amaç: Üst birinci premolar çekiminin maksiller ve mandibular posterior boşluğa olan etkisinin değerlendirilmesidir.
Gereç ve Yöntem: Çalışmanın materyalini, dişsel Sınıf II maloklüzyona sahip, üst iki birinci premolar çekimi ile sabit apareylerle tedavi edilmiş 20 bireyin tedavi öncesi (T1), sonrası (T2) ve pekiştirme sonrası (T3) lateral sefalometrik radyografileri oluşturdu. Lateral sefalometrik radyografiler üzerinde, yedi boyutsal ve dört açısal ölçüm aynı yazar tarafından yapıldı. İstatistiksel analizde, sürekli sayısal değişkenlerin dağılımının normale yakın dağılıp dağılmadığı Shapiro-Wilk testiyle incelendi. Ölçüm ortalamalarında istatistiksel olarak anlamlı değişim olup olmadığı parametrik verilerde Wilks’in Lambda testi, nonparametrik verilerde ise Friedman testiyle incelenerek; Bonferroni düzeltmeli çoklu karşılaştırma ya da Dunn-Bonferroni post-hoc testler uygulandı. p<0.05 değeri anlamlı olarak kabul edildi.
Bulgular: SNB açısı T3’te T1’e göre anlamlı düzeyde arttığı bulundu (p<0.05). ANB açısı T3’te T1’e göre anlamlı düzeyde azaldığı bulundu (p<0.05). T1’e göre hem T2 hem de T3’te U1-NA mesafesinin anlamlı düzeyde azaldığı bulundu (p<0.001). T1’e göre hem T2 hem de T3’te ve T2’ye göre T3’te U6-PTV mesafesinin anlamlı düzeyde arttığı bulundu (p<0.001). T1’e göre hem T2 (p<0.01) hem de T3’te (p<0.001) ve T2’ye göre T3’te CLMD (p<0.05) mesafesinin anlamlı düzeyde arttığı bulundu. T1’e göre hem T2 hem de T3’te ve T2’ye göre T3’te DC mesafesinin anlamlı düzeyde arttığı bulundu (p<0.001). CL1 mesafesi T3’te T1’e göre anlamlı düzeyde artmış bulundu (p<0.05).
Sonuç: Maksiller posterior boşlukta premolar çekimine bağlı olarak artış izlenmiştir. Mandibular posterior boşlukta izlenen artışın maksiller posterior boşluktan daha az olduğu görülmüştür. Maksiller kesici dişlerde retraksiyon ve maksiller molarlarda meziyalizasyon hareketi izlenmiştir.

Keywords

Posterior boşluk, Premolar çekimi, Ortodonti

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