Program including abstracts as pdf available here

P 40
Title
EFFECT OF IMAGE PROCESSING ON PROXIMAL CARIES DETECTION AT DIFFERENT
EXPOSuRES
Authors
E. ONEM 1 , E. SOGuR 1 , b.G. bAKSI 1 , A. MERT 2
Affiliations
1 Ege University, School of Dentistry, Department of Oral & Maxillofacial Radiology, Izmir, TUR-
KEY, 2 Ege University, Faculty of Science, Department of Statistics, Izmir, TURKEY
Body
Objective: To compare the diagnostic accuracy of proximal enamel demineralization before and
after the application of processing algorithms at two exposures.
Methods: Forty-five extracted sound premolars were imaged prior to any acid application and
the images were used as controls. Standard enamel windows were exposed to a demineralizing
solution for 80 hrs. Teeth were radiographed with storage phosphor plate system for 0.08 s
and 0.12 s. Original images (O) were enhanced using sharpen (S) and exp 2 (E) filters. Five
observers scored the presence/absence of proximal demineralization. The diagnostic accuracy
was expressed as the area under the ROC curve (Az). Azs were compared with two-way ANOVA.
Post-hoc t-test was used for pair-wise comparisons (p=0.05). Interobserver agreement was
measured with Kappa.
Results: The mean Azs for 0.08s were 0.95, 0.99 and 0.87 for O, S, and E respectively. Corresponding
Azs for 0.12s were 0.95, 0.98 and 0.88. Sensitivity of S (0.98) was higher than O
(0.84) while specificities were comparable at both exposures. Sensitivity and specificity of E
was lower than O and S for both exposures. Azs for 0.08s and 0.12s were not different for any
of the image types (p>0.05). S and O showed higher accuracy than E for the detection of proximal
demineralization for both exposures (p0.05). Agreement ranged between moderate and substantial.
Conclusions: Original and sharpened images showed comparable performance, but change in
exposure did not affect the detection accuracy of subsurface enamel demineralization.
Keywords
Radiography, Dental, Digital,Dental Caries/diagnosis,Image Enhancement
POSTerS
155