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OP 31<br />
Title<br />
ACCuRACy OF CbCT IN DETECTION OF CARIOuS LESIONS IN VICINITy OF<br />
AMALGAM FILLING.<br />
Authors<br />
T. KuLCzyK 1 , M. DySzKIEWICz-KONWINSKA 1 , J. KRzyzOSTANIAK 2 , M. OWECKA 1<br />
Affiliations<br />
1 Section of Dental Radiology,Department of Biomaterials,Poznan University of Medical Sciences,<br />
Poznan, POLAND, 2 Department of Conservative Dentistry and Periodontology, Poznan<br />
University of Medical Sciences, Poznan, POLAND<br />
Body<br />
OBJECTIVE:<br />
The aim of the investigation w<strong>as</strong> to <strong>as</strong>sess the influence of streak artefacts caused by amalgams<br />
during CBCT examination on detection of carious lesions located in the vicinity of<br />
amalgam fillings.<br />
MATERIAL AND METHOD:<br />
102 non-cavitated premolar and molar teeth were placed with approximal contacts consisting<br />
of three non-cavitated teeth and one MOD amalgam filled tooth in between. Radiographs of all<br />
the teeth were recorded using the CBCT system (NewTom 3G FOV9‘). Data from the CBCT unit<br />
were reconstructed and sectioned (0.25mm) in the mesiodistal tooth plane. Images were evaluated<br />
twice by two observers, using a five-step confidence scale. After the CBCT examination<br />
the teeth were individually sectioned in the mesiodistal direction with a diamond saw . Using<br />
a light microscope at 40 times magnification two different observers examined the tooth<br />
sections to established a true status of all approximal surfaces<br />
RESULTS:<br />
Sensitivity of the CBCT for the detection of caries on surfaces located proximally and distally<br />
to an amalgam filing w<strong>as</strong>: for enamel caries 0 and 0.07 respectively, for dentin caries 0.28<br />
and 0.29 respectively. Intraobserver reliability w<strong>as</strong> high and comparable for both observers<br />
(kappa coefficient 0.78 and 0.75 respecetively) but very poor interobserver agreement h<strong>as</strong><br />
been found (kappa coefficient 0.081) showing that the calculated values did not significantly<br />
differ from a random <strong>as</strong>signment.<br />
CONCLUSION:<br />
CBCT images are not suitable for caries diagnosis in c<strong>as</strong>es w<strong>here</strong> amalgam fillings are present in<br />
vicinity due to the extensive metal artefacts present.<br />
Keywords<br />
CBCT,,artifacts, caries<br />
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