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International Journal of Computerized Dentistry

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https://www.readbyqxmd.com/read/29610781/three-dimensional-registration-of-real-jaw-motion-tracking-data-and-its-therapeutic-consequences
#1
Andreas Kurbad
When determined by conventional jaw relation recording methods, the real position of the condyle remains largely unclear because the geometric relationship between the reference point and the position of the condyle is unknown. Sicat Function combines cone beam computed tomography (CBCT) data with digital jaw motion tracking (JMT) data and digital intraoral surface data. It is thus capable of measuring and visualizing patient-specific jaw movements. The corresponding patient-specific treatment position can be defined and integrated in various therapeutic appliances, eg, repositioning splints designed to increase the vertical dimension of occlusion (VDO)...
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29610780/systematics-and-concepts-for-the-digital-production-of-complete-dentures-risks-and-opportunities
#2
Josef Schweiger, Juliane Stumbaum, Daniel Edelhoff, Jan-Frederik Güth
The rehabilitation of the edentulous patient with complete dentures is still an essential aspect of dental prosthetics. Modern digital manufacturing technologies have made it possible to produce even complete dentures digitally. This has several advantages, especially regarding the properties of the denture material. In addition, the use of digital technology facilitates new treatment concepts and procedures that reduce the number of appointments needed at the dental office.
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29610779/evaluation-of-flexural-strength-and-surface-properties-of-prepolymerized-cad-cam-pmma-based-polymers-used-for-digital-3d-complete-dentures
#3
Mustafa Arslan, Sema Murat, Gulce Alp, Ali Zaimoglu
PURPOSE: The objectives of this in vitro study were to evaluate the flexural strength (FS), surface roughness (Ra), and hydrophobicity of polymethylmethacrylate (PMMA)-based computer-aided design/computer-aided manufacturing (CAD/CAM) polymers and to compare the properties of different CAD/CAM PMMA-based polymers with conventional heat-polymerized PMMA following thermal cycling. MATERIALS AND METHODS: Twenty rectangular-shaped specimens (64 × 10 × 3.3 mm) were fabricated from three CAD/CAM PMMA-based polymers (M-PM Disc [M], AvaDent Puck Disc [A], and Pink CAD/CAM Disc Polident [P], and one conventional heat-polymerized PMMA (Promolux [C]), according to ISO 20795-1:2013 standards...
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29610778/testing-occlusal-performance-by-using-chewing-simulation-with-virtually-designed-substrate
#4
Andra Maria Pascale, Sebastian Ruge, Steffen Hauth, Bernd Kordaß, Lars Linsen
Physically accurate deformable models based on the finite element method (FEM) are being used for a wide range of applications, from entertainment to medicine. This article describes how we applied this method in the CAD/CAM area that is concerned with reconstructing 3D models of teeth. We simulated the process of mastication by employing a deformable model that represented the substrate, and a rigid model that represented the teeth. We extended a recent approach for substrate deformation by also modelling the fracture of the substrate by the mastication process...
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29610777/effects-of-occlusal-modifications-on-the-muscular-activity-of-the-masseter-and-anterior-temporalis-muscles
#5
Alexandra Kravchenko-Oer, Mara Koch, Kristina Nöh, Charlott Osterman, Luzie Winkler, Bernd Kordaß, Sybille Hugger, Hans Jürgen Schindler, Alfons Hugger
The aim of this study was to analyze the effect of occlusal modifications on the muscular activity of the masseter and anterior temporalis muscles. The study included 41 healthy dentate subjects who were examined in relation to the muscle activity of the masseter and anterior temporalis muscles recorded by surface electromyography (EMG) bilaterally in two different sessions. Occlusal plastic strips (thickness: 0.4 or 0.8 mm) were placed on different mandibular teeth to simulate different bite constellations (unilateral, bilateral transversal, and bilateral diagonal)...
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29610776/occlusion-of-artificial-teeth-in-complete-dentures-population-based-analysis
#6
Bernd Kordaß, Alexandra Quooß, Diana John, Sebastian Ruge
Occlusion is a central aspect of all prosthetic restorations, including complete dentures. Within the follow-up (SHIP 1) of the regional population-based "Study of Health in Pomerania" (SHIP), a number of 3300 study participants were examined concerning the occlusion of artificial teeth in purely mucosa and non-implant-borne complete dentures. These subjects were representative of the population. Therefore, occlusal bite registrations obtained in habitual intercuspation (IP) were made and were digitally evaluated with the Greifswald Digital Analyzing System (GEDAS) software based on transparent contact areas...
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29610775/editorial-digital-complete-dentures-quo-vadis
#7
Bernd Kordaß
No abstract text is available yet for this article.
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29292415/vertical-dimension-augmentation-with-a-full-digital-approach-a-multiple-chairside-sessions-case-report
#8
Carlo Massimo Saratti, Filippo Del Curto, Giovanni Tommaso Rocca, Ivo Krejci
The last few decades have seen an upward trend of the pathologies of abrasion, erosion, and abfraction. These pathologies, especially in combination, can provoke a significant loss of tooth substance. Nowadays, modern digital chairside technologies and new restorative materials allow clinicians to restore the lost tooth structure with a minimally invasive and fully digital approach. This article describes a step-by-step procedure of a full-mouth rehabilitation performed with a total digital chairside approach in several appointments...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29292414/adjustment-of-retention-of-all-ceramic-double-crown-attachments
#9
Franz Sebastian Schwindling, Peter Rammelsberg, Johannes Krisam, Stefan Rues
OBJECTIVES: Double-crown attachments, such as conical crowns (CCs), can retain removable partial prostheses. Digital manufacturing enables the use of innovative materials such as zirconia, and new workflows. The aim of this study was to investigate options for the adjustment of retention forces of all-zirconia CCs. MATERIALS AND METHODS: Single zirconia primary crowns were produced with convergence angles (α) of 3 and 4 degrees, together with monolithic zirconia secondary crowns (n = 8 for α = 3 degrees; n = 8 for α = 4 degrees)...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29292413/how-are-faces-with-increased-and-decreased-lower-facial-height-perceived-visually
#10
Furkan Dindaroğlu, Servet Doğan, Aycan Yalçın, Nilay Türkan, Elif Yüvrük
OBJECTIVE: The aim of this study was to assess how faces with different lower facial height (LFH) were visually perceived by laypersons using eye-tracking technology. MATERIALS AND METHOD: A total of 48 facial images of volunteers with different LFH (normodivergent, hypodivergent, hyperdivergent) were randomly viewed by 50 participants (25 male, 25 female) using Tobii Eye Tracker (Tobii T60, Tobii Technology AB, Sweden). Facial images with normal lower anterior facial height (LAFH) were used as the control group...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29292412/assessment-of-residual-coronal-tooth-structure-postendodontic-cavity-preparation-using-digital-dental-impressions-and-micro-computed-tomography
#11
Nassr Al-Nuaimi, Shanon Patel, Federico Foschi, Francesco Mannocci, Rupert S Austin
OBJECTIVES: To evaluate the in vitro accuracy of digital impressions for three-dimensional (3D) volumetric measurement of residual coronal tooth structure postendodontic cavity preparation, with reference to micro-computed tomography (μCT). METHODS: Quantification of the accuracy and precision of the intraoral digital scanner (3M True Definition Scanner - IOS) was performed using a metrology gauge block and a profilometric calibration model. Thirty-four human extracted molars with endodontic access cavities were scanned using both intraoral scanning (test scanner) in high-resolution mode, and µCT (reference scanner: GE Locus SP μCT scanner) in high- (HiResCT) and low- (LoResCT) resolution modes...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29292411/suitability-and-accuracy-of-cbct-model-scan-an-in-vitro-study
#12
COMPARATIVE STUDY
Jan Robben, Jonas Muallah, Christian Wesemann, Roxana Nowak, James Mah, Peter Pospiech, Axel Bumann
Plaster casts can be digitized with desktop scanners, intraoral scanners, and recently also with cone beam computed tomography (CBCT). The aim of this study was to investigate the accuracy of five different CBCT devices digitizing a plaster cast. A study cast serving as a patient was made using the double mix impression technique, and the impression was poured out with plaster. On the resulting plaster cast, arch length (AL), intermolar width (IMW), and intercanine width (ICW) were measured by a coordinate measuring machine (CMM) (Zeiss O-Inspect 422)...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29292410/in-vivo-tooth-color-measurement-with-a-new-3d-intraoral-scanning-system-in-comparison-to-conventional-digital-and-visual-color-determination-methods
#13
COMPARATIVE STUDY
Albert Mehl, Gabriel Bosch, Carolin Fischer, Andreas Ender
STATEMENT OF PROBLEM: Three-dimensional (3D) intraoral scanning systems allow for the simultaneous acquisition of 3D information about tooth surfaces and a photorealistic view of the patient's tooth colors. AIM: The goal of this study was the in vivo comparison of a new 3D scanner with a color acquisition mode and conventional visual and digital color measurements. MATERIALS AND METHODS: The colors of 40 teeth of 20 patients were evaluated in seven ways: 1) By dentists using the Vita 3D-Master; 2) By dental technicians using the Vita 3D-Master; 3) With the 3Shape Trios device; 4) With the Vita Easyshade device; 5) With the Vita Easyshade Advance device; 6) With the SpectroShade device; and 7) With the SpectroShade Micro device...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29292409/editorial-from-pioneer-to-standard-setter-the-ijcd-celebrates-its-20th-anniversary
#14
Klaus Wiedhahn, Bernd Reiss, Olaf Schenk
No abstract text is available yet for this article.
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28852748/up-to-27-years-clinical-long-term-results-of-chairside-cerec-1-cad-cam-inlays-and-onlays
#15
Tobias Otto
The objective of this follow-up study was to examine the performance of Cerec 1 inlays and onlays in terms of clinical quality over a mean functional period of 25 years. Out of 200 Cerec 1 inlays and onlays placed consecutively in 108 patients in a private practice between 1989 and early 1991, 141 restorations could be reevaluated in 65 patients after up to 26 years and 10 months. All ceramic inlays and onlays had been generated chairside using the Cerec 1 method, and had been seated adhesively using bonding composite...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28852747/establishing-a-suitable-surface-roughness-for-lithium-disilicate-implant-abutments-under-laboratory-conditions-a-morphologic-sem-and-profilometric-pilot-study
#16
Gertrud Fabel, Florian Beuer
The increasing use of dental implants rather than fixed cantilever bridges for standard dental restorations has led to the development of multiple materials in this field. The goal in modern dentistry in recent years has been to achieve results in implantology that match the natural dentition in esthetics and function. Constant efforts have been made to achieve a perfect emergence profile, and to individualize the surrounding periimplant soft tissue. Powder-free digital scanning is now possible, which allows for the computer-assisted design/computer-assisted manufacturing (CAD/CAM) of ready-to-fit customized immediate implant abutments in various appropriate materials...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28852746/fracture-resistance-of-single-rooted-pulpless-teeth-using-hybrid-cad-cam-blocks-for-post-and-core-restoration
#17
Leandro Passos, Bianca Barino, Laisa Laxe, Alexandre Street
PURPOSE: The purpose of this study was to determine whether there is a significant difference in the fracture strengths of hybrid computer-aided design/computer-aided manufacturing (CAD/CAM) blocks and fiber posts for post and core restorations in both ferrule and nonferrule pulpless mandibular canines. MATERIALS AND METHOD: Forty extracted human mandibular canines were divided into ferrule and nonferrule groups and restored with hybrid CAD/CAM blocks using either the CAD/CAM system or fiber posts (control)...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28852745/the-importance-of-the-cement-spacer-for-proper-crown-seating-erratum
#18
Sue Langham, James F Simon, Daranee Tantbirojn, David Redmond
Marginal integrity is important for the longevity of a restoration. An increase in the marginal discrepancy after cementation contributes adversely to the longevity of a restoration. In the past, the preferred method to overcome this discrepancy was to create internal space for the cement by using a number of coats of a die-spacing material. In the digital age, however, this method is no longer the only option. Currently, an amount of die spacer is engineered into the computer program and forms part of the milling process...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28852744/antagonist-wear-by-polished-zirconia-crowns
#19
Oliver Hartkamp, Ulrich Lohbauer, Sven Reich
AIM: The aim of this in vivo study was to measure antagonist wear caused by polished monolithic posterior zirconia crowns over a 24-month period using the intraoral digital impression (IDI) technique. MATERIALS AND METHODS: Thirteen zirconia crowns were placed in nine patients. The crowns and adjacent teeth were captured using an intraoral scanner (Lava C.O.S.). The corresponding antagonist teeth and the respective neighboring teeth were also scanned. Scanning was performed immediately after the restoration (baseline) as well as 12 and 24 months after crown placement...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28852743/load-bearing-capacity-fracture-mode-and-wear-performance-of-digitally-veneered-full-ceramic-single-crowns
#20
Oliver Schubert, Ephraim Nold, Matthias Obermeier, Kurt Erdelt, Michael Stimmelmayr, Florian Beuer
OBJECTIVES: Computer-aided technologies can help to minimize clinical complications of zirconia-based restorations such as veneering porcelain fractures. The aim of this study was to evaluate different veneering approaches for zirconia single crowns regarding contact wear, fracture strength, and failure mode. METHODS: Six different types of computer-aided design (CAD) crowns were manufactured and conventionally cemented on 10 metal dies each: three groups with a zirconia framework and a CAD/CAM-fabricated veneering cap ("digital veneering system": DVS, CAD-on, Infix CAD), zirconia-based crowns with pressed veneering caps (Infix Press), zirconia framework containing the dentin layer with only the incisal enamel material added (dentin-core), and conventional substructure with powder buildup veneering porcelain (layering technique)...
2017: International Journal of Computerized Dentistry
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