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International Journal of Computerized Dentistry

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https://read.qxmd.com/read/30539177/from-3d-imaging-to-3d-printing-in-dentistry-a-practical-guide
#1
Norman Moser, Petra Santander, Anja Quast
3D imaging in dentistry plays an essential part in diagnostics and treatment planning. To transform digital images into a real object that can be experienced haptically may provide new opportunities to practitioners regarding patient communication, skills training, and treatment planning. Therefore, the aim of this article is to provide a practical guide from 3D imaging to 3D printing using low-cost printers and open source software; the authors used 3D Slicer software and a Meshmixer printer, including the printer's own software...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30539176/fabrication-of-obturator-prosthesis-by-fusing-cbct-and-digital-impression-data
#2
Sema Murat, Ayhan Gürbüz, Kıvanç Kamburoğlu
This clinical report describes a digital workflow using an intraoral digital impression and cone beam computed tomography (CBCT) volumetric data to create a three-dimensional (3D) virtual model of the dentition, defect area, and soft and hard tissue of a patient who had undergone a hemimaxillectomy. Stereolithography (SLA) 3D printing technology was used to produce a resin mold, from which an obturator prosthesis was fabricated through a conventional technique.
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30539175/intraoral-versus-extraoral-digital-occlusal-records-a-pilot-study
#3
Cristina Fraile, Alberto Ferreiroa, Eneko Solaberrieta, Guillermo Pradíes
The aim of the present pilot study was to analyze the reliability of interocclusal contact records generated with an intraoral scanner (TRIOS Standard) and an extraoral scanner (Zfx Evolution). Ten patients were selected. The number of occlusal contacts was first determined with the conventional method using 8-µm articulating paper (gold standard) (control). These conventional records were then compared with the intra- and extraoral digital records. Diagnostics tests (sensitivity, specificity, predictive values for positives and negatives), receiver operating characteristic (ROC) curve, and Cohen's kappa coefficient were performed to analyze the data...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30539174/accuracy-of-cbct-based-root-canal-length-predetermination-using-new-endodontic-planning-software-compared-to-measurements-performed-with-an-electronic-apex-locator-ex-vivo
#4
Jörg Philipp Tchorz, Michael Wolgin, Lamprini Karygianni, Kirstin Vach, Markus Jörg Altenburger
OBJECTIVE: To evaluate the accuracy of the new endodontic planning software (3D Endo Dentsply Sirona) based on cone beam computed tomography (CBCT) to predetermine root canal lengths compared with measurements performed with an electronic apex locator (Raypex 6; VDW) ex vivo. MATERIALS AND METHODS: CBCT scans of forty extracted human maxillary (n = 20) and mandibular (n = 20) molars were taken, and root canal lengths were predetermined with the 3D Endo software using the apical foramen (AF) and the adjoining cusp as references...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30539173/development-of-an-analytical-prepcheck-supported-approach-to-evaluate-tutor-based-assessments-of-dental-students-practical-skills
#5
Michael Wolgin, Wilhelm Frank, Andrej M Kielbassa
The aim of the present study was to develop an analytical computer-supported assessment concept for the objective evaluation of students' practical skills, and to investigate the assessor-dependent differences by setting tolerance limits applied during the 'glance and grade' evaluation. A sample of 54 conventionally supervised dental undergraduates were given training in the preparation of a macroretentive Class II cavity. The course participants then took a mandatory practical examination. Three (plus one) course instructors performed the visual evaluations of the examination tasks according to predefined assessment criteria, followed by optical impressions (quadrant scan using Omnicam; Cerec; Dentsply Sirona, Wals, Austria) and subsequent assessment of the prepared cavities (tooth 46) using the prepCheck application (Dentsply Sirona)...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30539172/a-comparison-of-crown-preparation-grading-via-prepcheck-versus-grading-by-dental-school-instructors
#6
Thomas C Kunkel, Robert L Engelmeier, Nilesh H Shah
Recent reports in the literature demonstrate the influence that digital dentistry is having on the preclinical training of dental students. However, none of these articles have discussed the use of PrepCheck (Sirona Dental Systems) in the evaluation of preparation taper in a preclinical environment. The present study compared the subjective grading of student tooth preparations by experienced, well-calibrated faculty with objective digital grading of the same preparations by means of the PrepCheck software...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30539171/hinge-axis-determination-of-the-temporomandibular-joint-and-its-interpretation-what-do-we-really-measure
#7
Albert Mehl
Terminal hinge axis (THA) determination is recommended in some clinical situations and for some diagnostic purposes. Different methods are described and are available for this task. In particular, circle fitting or iterative trace recording methods, in the conventional process known as the pantographic or Lauritzen method, have mostly been applied in clinical settings and have even been used as exact reference measures in many studies. The aim of this study was to investigate whether the conditions for THA determination by these methods principally allow for the differentiation between a pure rotational movement and a combined translational and rotational movement...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30539170/quality-improvement-of-functional-diagnostics-in-dentistry-through-computer-aided-diagnosis-a-randomized-controlled-trial
#8
Kai Becker, Holger A Jakstat, M Oliver Ahlers
Functional diagnostic examinations such as clinical functional analysis and manual structural analysis ('orthopedic tests') allow the dentist to establish a structured diagnosis. Previously, the process of correlating findings with the appropriate diagnoses was guided by human thought processes alone. The experimental diagnostic randomized controlled trial (RCT) in this study investigated whether computer-aided diagnosis (CADx) of temporomandibular disorders (TMD) offers quality advantages over traditional diagnosis (TRAD)...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30539169/editorial-simplification-itis-and-scientific-accuracy
#9
Albert Mehl
No abstract text is available yet for this article.
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30264055/customized-lattice-structure-in-reconstruction-of-three-dimensional-alveolar-defects
#10
Marcus Seiler, Peer W Kämmerer, Michael Peetz, Amely Hartmann
Missing or reduced buccal bone plates and a reduced vertical dimension still represent challenges in bone grafting and require a three-dimensional (3D) reconstruction. The protocol presented in this short technical note describes the clinical application of a patient-specific, titanium lattice structure for customized bone regeneration (CBR). A 3D projection of the bony defect is generated, and an individualized titanium lattice structure designed using computer-aided design/computer-aided manufacturing (CAD/CAM) procedures and rapid prototyping...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30264054/fully-digital-workflow-for-presurgical-orthodontic-plate-in-cleft-lip-and-palate-patients
#11
Karl-Friedrich Krey, Anja Ratzmann, Philine Henriette Metelmann, Marcel Hartmann, Sebastian Ruge, Bernd Kordaß
OBJECTIVE: In most cases, according to our treatment concept, a presurgical orthodontic treatment (POT) is performed on patients with cleft lip and palate (CLP). The aim of this case report is to demonstrate a completely digital workflow for the production of a palate plate. MATERIALS AND METHODS: For the assessment of the maxillary arch, a digital impression of the jaw was made on two patients with an intraoral scanner (Cerec Omnicam Ortho). After reconstruction of a virtual model from the scan data, appropriate areas of the jaw could be blocked out and a plate constructed...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30264053/multichromatic-and-highly-translucent-hybrid-ceramic-vita-enamic
#12
Harald Steinbrenner
Vita Enamic is a durable hybrid ceramic that can be processed with efficient computer-aided design/computer-aided manufacturing (CAD/CAM) support. The porous sintered feldspar ceramic block that is infiltrated with polymer does not require a ceramic furnace after being ground out. Instead, it only needs to be finished and polished. This makes one-time chairside treatment possible. In addition to the well-known monochromatic Vita Enamic blocks, a multichromatic version with integrated shade gradient and a super-translucent version have been developed...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30264052/evaluation-of-the-symmetry-of-biogeneric-design-suggestions-in-cerec-inlab
#13
Elmar Frank, Dietmar Frank
This study evaluates the symmetry of initial proposals for anterior tooth restorations delivered by the Cerec software. By using a symmetric preparation model and a special angulation gauge for restoration axes, the study proves that the restoration proposals are symmetric with respect to the median sagittal plane.
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30264051/clinical-performance-of-cad-cam-fabricated-monolithic-zirconia-endocrowns-on-molars-with-extensive-coronal-loss-of-substance
#14
Yun Zou, Jing Bai, JingZhou Xiang
OBJECTIVE: To clinically evaluate computer-aided design/computer-aided manufacturing (CAD/CAM)-fabricated molar endocrowns after 6 months and 1, 2, and 3 years of clinical service. MATERIALS AND METHODS: 289 patients with 321 molars (267 patients with one endocrown, two patients with two endocrowns, and ten patients with three endocrowns) exhibiting extensive coronal loss of substance participated in the study. Endocrown preparations were scanned, and endocrowns designed and machined with the Cerec CAD/CAM system...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30264050/clinical-quality-and-efficiency-of-monolithic-glass-ceramic-crowns-in-the-posterior-area-digital-compared-with-conventional-workflows
#15
Sven Mühlemann, Goran I Benic, Vincent Fehmer, Christoph H F Hämmerle, Irena Sailer
PURPOSE: The aim of this clinical study was to test whether or not digital workflows for the fabrication of crowns render different clinical outcomes from the conventional pathway with respect to (1) crown quality, and (2) time efficiency. MATERIAL AND METHODS: For each of the 10 patients in need of one tooth-supported crown, five monolithic crowns were produced out of lithium disilicate reinforced glass ceramic. Four different optical impression and associated computer-aided design/computer-aided manufacturing (CAD/CAM) systems were used for crown fabrication (digital workflows): (1) Lava C...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30264049/the-determination-of-the-terminal-hinge-axis-a-fundamental-review-and-comparison-of-known-and-novel-methods
#16
Albert Mehl
Different concepts are used for the analysis and transfer of mandibular movements to virtual or conventional articulating systems. Some common procedures and analyses include the determination of the terminal hinge axis. However, despite the widespread use of different methods for hinge axis determination, very little information on the applicability and quality of these methods is currently available in the literature. The aim of this study was to provide an overview of the methods already being applied and to search for novel algorithmic methods, comparing them with respect to achievable accuracy and indication...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30264048/fracture-strength-of-cad-cam-posterior-ceramic-crowns-after-manual-enhancement-of-occlusal-morphology
#17
Leandro Passos, Ysidora Torrealba, Bernard Linke, Alexandre Street, Sheila Passos
PURPOSE: The aim of this study was to investigate the fracture strength of computer-aided design/computer-aided manufacturing (CAD/CAM) posterior ceramic crowns with and without post-milling manual enhancement of occlusal morphology (MEOM), as indicated especially with early CAD/CAM restorations that have limited capacity to generate natural occlusal morphology. MATERIALS AND METHODS: A mandibular molar of an acrylic tooth model was prepared to receive a CAD/CAM all-ceramic crown and was used as a master die to fabricate 80 prepared tooth replicas using an epoxy resin with an elastic modulus (E) of 18 GPa...
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/30264047/editorial-from-lectern-to-storytelling
#18
Klaus Wiedhahn
No abstract text is available yet for this article.
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/29967907/monolithic-zirconia-multiple-unit-implant-reconstructions-on-titanium-bonding-bases
#19
João Pitta, Vincent Fehmer, Irena Sailer, Stefan P Hicklin
The development of titanium bonding bases allows for the use of implant-supported monolithic reconstructions in a digital workflow. Different base configurations are available according to each clinical indication. In this case report, the selection of titanium bonding bases for crowns was considered for a multiple-unit fixed dental prosthesis (FDP).
2018: International Journal of Computerized Dentistry
https://read.qxmd.com/read/29967906/possibilities-and-limitations-of-computer-assisted-implant-planning-and-guided-surgery-in-the-anterior-region
#20
Arndt Happe, Vincent Fehmer, Insa Herklotz, Hans-Joachim Nickenig, Irena Sailer
Three-dimensional (3D) implant positioning is an important prognostic factor for anterior dental implants. Modern 3D imaging and implant treatment planning systems are available today for precise dental implant planning and placement. The transfer of implant position information to industrially manufactured templates for guided implant surgery has been possible for years now. What is new is the possibility of combining the datasets with the surface scan data of a diagnostic wax-up and setup for prosthetic-driven implant planning...
2018: International Journal of Computerized Dentistry
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