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Masters Thesis 2020 Revised.pdf (9.26 MB)

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Suppression of CBCT X-ray Scatter Using Bite Registration (PVS) Material

Kessling, Paul Christopher, II
http://orcid.org/0000-0001-5676-7495
http://rave.ohiolink.edu/etdc/view?acc_num=osu1594998120708499

Abstract Details

2020, Master of Science, Ohio State University, Dentistry.
The introduction of cone-beam computed tomography (CBCT) into the field of dentistry has facilitated simplified and reliable implant planning for the dental practitioner. The ability of CBCT technology to render accurate 3D volumetric data of the maxillofacial region allows the clinician involved in implant rehabilitation to make accurate assessments of the edentulous sites, thus ensuring proper surgical placement of dental implants without injuring vital structures. Available CBCT applications along with third party software provide extensive tools to conduct analysis, complete treatment plans, prepare surgical guides, study virtual prototypes, and print 3D resin models, all of which ease the process of diagnosis and executing the delivery of proper treatment. Despite the many advantages of CBCT technology, projection images are often plagued by artifacts, which are defined as visualized structures in the reconstructed data that are not present in the scanned object. Metal objects such as dental fillings, implants, and metal crowns that may be present in the patient can create severe artifacts that degrade image quality to the extent they are diagnostically unusable. Most of the artifacts are due to beam hardening and scattered radiation. Recently, it has been suggested that adequately covering metallic restorations with Memosil 2 polyvinyl siloxane (PVS) bite registration material can aid in suppressing scatter. The aim of this study was to investigate this claim. A secondary objective was to investigate other PVS bite registration materials in order to determine which material was most effective at suppressing scatter. Six commonly available bite registration materials were used in the investigation. The subject was a human mandible. Teeth in the mandible were prepared for four different full coverage restorations (two molars and two canines). The restoration materials included porcelain fused metal, gold, zirconia, and lithium disilicate (IPS e.max). Each bite registration material was loaded into an individual plastic stock impression tray and impressed over the teeth with uniform pressure. After the material was set, the impression trays were removed, and the excess material was trimmed from the borders of each tray. Each tray with bite registration material and an empty tray were then placed over the teeth during the scanning procedures resulting in a total of seven samples. The mandible was then scanned with the respective samples situated over the teeth independently by means of an I-CAT CBCT scanning machine, with an I-collimator which automatically adjusts the field of view for each scan, keeping it focused to the area of interest. A 0.3 mm voxel size was utilized for the scans to standardize the size used for any patient scanning. The machine had a 14-bit depth, which allowed adequate gray shade distribution and detection in each image. Artifacts, although not physically present in the imaged object, are manifestations of the back projection algorithms and are represented as grayscale densities in image voxels. Due to the fact that artifacts cannot be measured directly, the number of voxels displaying grayscale density was calculated for each sample scan. The proposition being, if scatter was in fact suppressed by the bite registration material samples, the images would contain fewer artifacts and a lower number of voxels containing grayscale density. The voxel counts for each sample were then compared to the voxel count in the control scan. All sample scans including the empty plastic tray were unsuccessful in suppressing scatter and significantly enhanced the amount of artifact reconstructed in the projection images.
Damian Lee, DDS, MS, FACP (Advisor)
Sonya Kalim, DMD, MDS (Committee Member)
Do-Gyoon Kim, PhD (Committee Member)
49 p.
Dental Care; Dentistry; Radiology

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Citations

  • Kessling, II, P. C. (2020). Suppression of CBCT X-ray Scatter Using Bite Registration (PVS) Material [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1594998120708499

    APA Style (7th edition)

  • Kessling, II, Paul. Suppression of CBCT X-ray Scatter Using Bite Registration (PVS) Material . 2020. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1594998120708499.

    MLA Style (8th edition)

  • Kessling, II, Paul. "Suppression of CBCT X-ray Scatter Using Bite Registration (PVS) Material ." Master's thesis, Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1594998120708499

    Chicago Manual of Style (17th edition)

osu1594998120708499
1,102
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This open access ETD is published by The Ohio State University and OhioLINK.