Relationship between volume of submandibular salivary stones in vivo determined with Cone-Beam Computer Tomography and in vitro with micro-Computer Tomography / Relación entre el volumen de cálculos salivales submandibulares in vivo determinado con tomografía computarizada de haz cónico e in vitro con microtomografía computarizada

ABSTRACT

Background: Successful removal of salivary stones depends on exact pretreatment information of the location, thesize and shape of the stones. This study aimed to compare the volume of submandibular sialoliths determined bypreoperative Cone-Beam Computer Tomography (CBCT) scans with the volume of the removed stones on micro-Computer Tomography (micro-CT) scans.Material and Methods: In this study, using twenty-one submandibular sialoliths, the pretreatment volumes in-vivomeasured on CBCT were compared to the volumes of removed stones determined by micro-CT scans. The volumemeasured on micro-CT scans served as the gold standard. Pre-operative CBCT’s and in-vitro micro-CT’s wereconverted into standard tessellation language models (STL-models) using an image segmentation software pack-age. The CBCT and micro-CT images of the stones were subsequently metrologically assessed and compared toeach other using reverse engineering software.Results: Volumes of submandibular sialoliths determined by CBCT’s correlated significantly with volumes mea-sured on micro-CT’s (Spearman’s coefficient r = 0.916). The interquartile range (IQR) for the volume measuredwith micro-CT was 117.23. The median is 26.41. For the volume measured with CBCT the IQR was 141.3 and themedian 36.61. The average volume on micro-CT is smaller than on CBCT.Conclusions: When using CBCT-scans for the detection of submandibular sialoliths one should realize that in-vivothose stones are actually a fraction smaller than assessed on the preoperative scan. This is important when cut-offvalues of sizes of stones are used in the pretreatment planning of stone removal.(AU)