Program including abstracts as pdf available here
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P 64<br />
Title<br />
ObSERVER PERFORMANCE ON ASSESSMENT OF LOWER THIRD MOLARS uSING STEREO-<br />
SCANOGRAMS<br />
Authors<br />
H. HINTzE 1 , L.H. MATzEN 1<br />
Affiliations<br />
1 Aarhus University - Institute of Odontology - Department of Oral Radiology, Aarhus,<br />
DENMARK<br />
Body<br />
Objective: To evaluate observer performance for <strong>as</strong>sessment of impacted lower third molars<br />
before surgical removal using stereo-scanograms.<br />
Methods: 100 digital stereo-scanograms of lower third molars scheduled for surgical removal<br />
were examined by two observers (obs1 and 2) at two different occ<strong>as</strong>ions. The radiographs were<br />
obtained by a Scanora unit operating with multiprojection narrow beam technique resulting<br />
in one large image consisting of 4 minor images exposed from different horizontal and vertical<br />
angulations. The observers independently <strong>as</strong>sessed the third molars for parameters important<br />
for the surgical treatment plan. The parameter ‘root/canal relationship in horizontal direction’<br />
is often mandatory for deciding on surgical removal in c<strong>as</strong>e of no direct contact between the<br />
root and canal or coronectomy in c<strong>as</strong>e of direct contact between these structures – possibly<br />
verified by a more sophisticated radiographic method.<br />
Results: The inter-observer kappa values ranged from 0.15 for ‘eruption status’ to 0.72 for<br />
‘number of roots’. The inter-observer kappa-value for ‘root/canal relationship in horizontal<br />
direction’ w<strong>as</strong> 0.25, w<strong>here</strong><strong>as</strong> the percentage of identical scores obtained by the two observers<br />
w<strong>as</strong> only 47. The intra-observer kappa values for all parameters were higher for obs1 than for<br />
obs2 except for ‘number of roots’. Both observers obtained the lowest intra-observer kappa<br />
value and the lowest percentage of identical registrations for ‘root/canal relationship in horizontal<br />
direction’. For this parameter obs1 w<strong>as</strong> more than double <strong>as</strong> reproducible than obs2.<br />
Conclusion: Large differences were found in inter- and intra-observer <strong>as</strong>sessment of impacted<br />
lower molars using stereo-scanograms. This might result in a highly observer-dependent surgical<br />
treatment plan.<br />
Keywords<br />
Lower third molars,Radiography,Diagnostic reproducibility<br />
POSTerS<br />
179
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