Measurement of Tooth Length by Using Dental Volumetric Tomography with 6 inch and 9 inch Field of Views

Yıl 2009, Cilt: 3 Sayı: 1, 289 - 294, 01.04.2009

Kıvanç Kamburoğlu Tuncer Özen Cenk Kılıç

Öz

To assess the accuracy and reproducibility of length measurements obtained from cadaver teeth by using dental volumetric tomography. Images of 18 healthy teeth from 2 cadavers were acquired with a dental volumetric tomography NewTom 3G Plus scanner using both 6 inch and 9 inch field of views. Two observers separately measured the length of each tooth on cross-sectional images by use of the inbuilt measurement tools twice with an interval of one week. Thereafter, real lengths of the teeth were measured with a precision digital caliper by an anatomist. Observer agreement was calculated by Gage R&R ANOVA analysis. Correlation between the quantitative measurements obtained from cone beam CT and digital caliper was tested by regression analysis with the null hypothesis being correlation coefficient was equal to zero. There was an insignificant difference between or within observers considering the tooth length measurements obtained by 6 inch FOV and 9 inch FOV images. Regression analysis between tooth length measurements made by direct caliper and 6 inch FOV – 9 inch FOV images revealed high regression coefficient R-sq = 96.6% for 6 inch and R-sq = 96.9% for 9 inch showing a strong linear relationship. The tooth length measurement difference of 6 inch FOV and 9 inch FOV images from the direct caliper measurements showed means of 0.17 mm and 0.16 mm, respectively.Highly accurate and reproducible results were obtained in tooth length measurements by using dental cone beam computerized tomography

Anahtar Kelimeler

Dental volumetric tomography, NewTom, tooth length measurement

Diş Uzunluklarının Dental Volumetrik Tomografi Yardımıyla 6 inç ve 9 inç Tarama Alanları Kullanılarak Ölçülmesi

Öz

Kadavra dişlerinin uzunluklarının ölçülmesinde dental volumetrik tomografinin kesinliğinin ve tekrarlanabilirliğinin değerlendirilmesi. İki adet kadavra mandibulasına ait 18 adet sağlıklı diş, dental volumetrik tomografi NewTom 3G Plus yardımıyla 6 inç ve 9 inç tarama alanları kullanılarak görüntülendi. İki gözlemci, oluşturulan kesitsel görüntüler üzerinden diş boylarını birer hafta arayla ikişer kez ölçtü. Daha sonra, belirlenen 18 adet dişin gerçek boyu, bir anatomist tarafından dijital kumpas yardımıyla ölçüldü. Gözlemci uyumu için Gage R&R ANOVA analizi yapıldı. Dental volumetrik tomografi ve dijital kumpas arasındaki ölçümlerin korelasyonu için regresyon analizi yapıldı. İki farklı tarama alanı ile elde edilen görüntülerden yapılan uzunluk ölçümleri dikkate alındığında gözlemci içi ve gözlemciler arası uyumda önemsiz farklılıklar bulundu. Dijital kumpas ve dental volumetrik tomografi ile iki ayrı tarama alanı kullanılarak yapılan diş uzunluğu ölçümleri arasında yüksek regresyon katsayısı ile birlikte kuvvetli çizgisel bir ilişki bulundu 6 inç tarama alanı ile R-kare = %96.6 ve 9 inç tarama alanı ile R-kare = %96.9 . Dijital kumpas ile yapılan uzunluk ölçümleri ile 6 inç tarama alanıyla alınan görüntüler arasındaki ortalama farklılık 0.17 mm iken 9 inç tarama alanıyla alınan görüntülerde ise bu fark 0.16mm olarak bulundu. Dental volumetrik tomografi kullanılarak diş uzunluğu ölçümlerinde kesin ve tekrarlanabilir sonuçlar ortaya kondu

Anahtar Kelimeler

Dental volumetrik tomografi, NewTom, diş uzunluk ölçümü

Kaynakça

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