Validity of maxillary sinus volumetric measurements using the 3D orthogonal cone beam computed tomography images versus direct skull volumetric measurements: An in vitro study

Abstract

Introduction: the total volume of maxillary sinus is important for maxillofacial reconstruction, plastic surgeries and prosthetic rehabilitation. It is important to diagnose sinus hypoplasia secondary to craniofacial syndromes, sinus obliteration caused by infections or blood dyscrasis.Aim of the study: The aim of this study was to assess the accuracy of CBCT volumetric measurements of maxillary sinus using the geometric rule of pyramid volume based on CBCT linear measurements versus real skull measurements.Materials and methods: fourteen skulls were scanned using Planmeca Promax 3D MID and the maxillary sinus pyramid height, length and width were measured in cm. The volume of 24 sinuses were calculated from pyramid volume (cm 3 ) = 1/3 Height × Length × Width. The CBCT volumes and the reference standard were analyzed for error assessment using Dahelberg error and Relative Dahelberg Error.Results: 4.3-4.7% was the error obtained from CBCT volumetric measurements using the rule of pyramid volume. 0.9 correlation was detected between the CBCT volume and the reference standard, between the observers and within the same observer.Conclusion: the geometric rule of pyramid volume based on CBCT linear measurements can be used to assess maxillary sinus volume. KEY WORDS: Maxillary sinus, CBCT, linear measurements, pyramid volume, accuracy. (348) Reham Mohamed Hamdy, et al.

Accuracy of Cone Beam Computed Tomography in Volumetric Evaluation of the Mandibular Condyle

“…However, since CBCT is a relatively recent three-dimensional imaging modality, the accuracy of condylar volumetric measurements obtained from its images need to be further investigated for confirmation due to the scarcity of studies conducted on the topic, contrary to other anatomical structures and spaces in the maxillofacial region (e.g. maxillary sinus, teeth sockets and upper airway space) which have been extensively studied for volume accuracy (11)(12)(13) .…”

“…Ever since its development, CBCT has been extensively used for temporomandibular joint imaging (TMJ), where this technique has shown superiority in assessing condylar shape, morphology and dimensions for both, physiological and pathological diagnostic purposes. The condyle, the main growth center in the jaw, responds to ongoing stimuli through remodeling, and as a result, it is crucial to the final dimensions of the mandible as well as the relation between the maxillary and mandibular bases and some malocclusions (4,5) . Nowadays, accurate linear, angular and volumetric measurements have become essential in most of the dental branches.…”