Relationship of impacted third nmolar radiographic predictors on Orthopantomogram (OPG) with Cone Beam Computed Tomography (CBCT) images-A systematic review

Abstract

AIM & OBJECTIVE : Tofindcorrelation of panoramic radiographic indicators
with CBCT images &compare the diagnostic accuracy of CBCT and digital
OPG in assessing the relationship between the mandibular nerve canal(MNC)
and impacted third molars(ITM).
MATERIALS & METHOD: Articles identified through database searching
(PUBMED,MEDLINE, SCOPUS ) were 17 & included articles were 11.
Retrospective studies, prospective studies, comparative studies, studies
comparing diagnostic accuracy of CBCT and OPG for relationship of ITM with
that of MNC, Studies published from 1/01/2012 to 15/07/2023 were included.
Studies in which relationship of ITM with that of MNC are diagnosed using
methods other than CBCT or OPG, Studies comparing CBCT and OPG for the
injury of MNC, Studies reporting relationship of MNC with ITM in only CBCT
or OPG only were excluded.
RESULTS: The sensitivity across the studies for CBCT was 97.4% while it was
between 67.8% and 98.55% for OPG radiography. The specificity for CBCT
was 85.7% and for OPG was 43.39%. Similarly, the positive predictive values
were demonstrated in only one study with 92.7% for CBCT and 97.6% for
OPG. Negative predictive value for CBCT was 94.7%.
CONCLUSION: CBCT is superior diagnostic accuracy compared to OPG in
assessing the proximity and relationship of ITM to the MN. Panoramic
radiographic indicators are reliable to predict position of ITM and MN in
CBCT.