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a cross-sectional study to estimate the prevalence of a second mesiobuccal canal of maxillary first and second molars in Egyptian population using cone beam computed tomography through retrospective data analysis
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Setting and Location:
Participants:
A total of 196 CBCT scans of Maxillary first and second permanent molars belonging to Egyptian individuals will be included.
Variables:
Data Sources / Measurements:
Retrospective Data Analysis will be performed after the CBCT images are pooled from the computer database.
All the CBCT examinations were scanned using Cranex® 3D SOREDEX, 0.2 voxel resolution, 8 × 6 cm FOV, 90 kVp, 10 mA and 6 seconds exposure time.
CBCT images will be analysed in the 3 planes; first the sagittal and coronal sections will be oriented parallel to the long axis of the root, and then sections will be obtained on the axial plane for detection of the 2nd mesiobuccal canal.
CBCT images will be interpreted by three oral radiologists independently; blinded from demographic data of the patients and from the results of each other.
Each one will evaluate the images separately twice with a period of two weeks between the two reading sessions.
Then inter-observational and intra-observational variability between the observers will be evaluated.
The sex of the patient will be identified from the patient's demographic data available on the patient's file on the database of the private radiographic centre.
Bias:
No source of bias.
Study Size:
The aim of the study is to assess the prevalence of a second mesiobuccal canal of maxillary first and second molars in Egyptian population. Based on the previous paper by Nikoloudaki et al, 2015, the prevalence of Second Mesiobuccal Canal of Maxillary First and Second Molars was 89 and 85%. Using a precision of 5, a design effect set at 1 with 95% CI (confidence interval), a total sample size of 196 will be sufficient. The sample size was calculated by Epi info.
Sampling Strategy: The sample will be collected by simple random sampling.
Quantitative Variables:
The number of CBCT scans of Egyptian individuals with second mesiobuccal canal will be counted to estimate the prevalence of the second mesiobuccal canal.
Statistical Methods:
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Data sourced from clinicaltrials.gov
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