Cone-Beam Computed Tomography Evaluation of Root Canal Morphology and Crown-to-Root Ratio of Mandibular Premolars in Middle Anatolian Population

Öz

Objective: The purpose of this retrospective study was to investigate morphological configurations of root canal anatomy and crown-to-root ratio of mandibular premolar teeth by gender, age intervals and occurrence of bilateral harmony using cone beam computed tomography scanning.

Material and Methods: A total of 1200 cone-beam computed tomographic images of mandibular first and second premolar teeth were obtained from 300 patients. The images were evaluated considering i) morphology of the root canal configurations, ii) crown length, iii) root length, iv) total tooth length, v) crown-to-root ratio; according to gender, age, and unilateral harmony. The data were analyzed with independent sample t-test and one-way analysis of variance (ANOVA). The p value was established as <0.05.

Results: Significant differences were present in gender, age and symmetrical comparisons both mandibular first and second premolar teeth (p<0.05). According to Vertucci's classification, the examined teeth exhibited six different root canal configurations as type I trough out type VI. Significant differences were found between age intervals in determination of crown length, root length, total teeth length and crown-to-root ratio (p<0.05).

Conclusion: In mandibular first premolar teeth, the frequency of two canals was approximately two times higher than second premolar teeth. The crown length and crown-to-root ratio decreased; otherwise, the root length increased by age.

Anahtar Kelimeler

• Cone-beam computed tomography
• crown-to-root ratio
• root canal morphology
• Mandibular premolar teeth

ORTA ANADOLU TOPLUMUNDA ALT ÇENE KÜÇÜK AZI DİŞLERİNİN KÖK KANAL MORFOLOJİSİNİN VE KRON-KÖK ORANININ KONİK IŞINLI BİLGİSAYARLI TOMOGRAFİ İLE DEĞERLENDİRİLMESİ

Öz

Amaç: Bu retrospektif çalışmanın amacı, alt çene küçük azı dişlerinin kök kanal anatomisinin yapısal konfigürasyonlarını ve kron-kök oranını cinsiyete, yaş aralıklarına ve bilateral uyum varlığına göre konik ışınlı bilgisayarlı tomografi kullanarak incelemektir.

Gereç ve Yöntemler: Toplam 300 hastanın alt çene birinci ve ikinci küçük azı dişlerinden 1200 adet konik ışınlı bilgisayarlı tomografik görüntüsü elde edildi. Görüntüler; i) kök kanal konfigürasyonlarının morfolojisi, ii) kron uzunluğu, iii) kök uzunluğu, iv) toplam diş uzunluğu, v) kron-kök oranı; cinsiyet, yaş ve bilateral uyuma göre değerlendirildi. Veriler bağımsız örneklem t-testi ve tek yönlü varyans analizi (ANOVA) ile analiz edildi. p<0.05 değeri anlamlı kabul edildi.

Bulgular: Hem alt çene birinci küçük azı dişleri hem de ikinci küçük azı dişlerinde cinsiyet, yaş ve simetrik karşılaştırmalarda anlamlı farklılıklar gözlendi (p<0.05). İncelenen dişler Vertucci sınıflandırmasına göre Tip I’den Tip VI’ya kadar altı farklı kök kanal konfigürasyonu gösterdi. Kron uzunluğu, kök uzunluğu, toplam diş uzunluğu ve kron-kök oranı bakımından yaş aralıklarının karşılaştırılmasında anlamlı farklılık bulundu (p<0.05).

Sonuç: Alt çene birinci küçük azı dişlerinde, iki kanal bulunma sıklığı ikinci küçük azı dişlerinden yaklaşık iki kat daha fazlaydı. Yaşla birlikte kron uzunluğu ve kron-kök oranı azalırken, kök uzunluğunun arttığı belirlendi.

Anahtar Kelimeler

• Konik-ışınlı bilgisayarlı tomografi
• Kron-kök oranı
• kök kanal morfolojisi
• Alt çene küçük azı dişleri

Kaynakça

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