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International Journal of Computerized Dentistry

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
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
Sigmar Schnutenhaus, Ulf Neveling, Ralph G Luthardt
The rehabilitation of the edentulous jaw using angulated implants and screw-retained retrievable fixed prosthetic dentures is a well-established treatment method. Possible advantages include the option to avoid bone augmentation, to provide an immediate long-term provisional restoration, and, where appropriate, to perform a minimally invasive procedure. A variety of prosthodontic solutions are available for the definitive restoration, not least allowing the patient's financial situation to be accommodated. Implementing this concept requires systematic planning and an exacting surgical procedure...
2018: International Journal of Computerized Dentistry
Oliver Schubert, Florian Beuer, Jan-Frederik Güth, Ephraim Nold, Daniel Edelhoff, Isabel Metz
The irreversible trend toward digitization in dentistry and dental technology has resulted in technical progress and continuous changes to conventional workflows. In particular, implantology and prosthetics have benefited from a multitude of interesting new possibilities. Three-dimensional (3D) computed radiography and digital surface scanning can be invaluable in terms of backward planning and making implant surgery and denture fabrication more predictable. In this context, two digital implant-prosthetic treatment strategies are presented that allow for an efficient digital workflow while ensuring a minimally invasive surgical procedure...
2018: International Journal of Computerized Dentistry
Su-Jin Jin, Il-Do Jeong, Ji-Hwan Kim, Woong-Chui Kim
OBJECTIVE: This study evaluated the accuracy (trueness and precision) of dental models fabricated using additive manufacturing (AM) methods such as PolyJet and fused deposition modeling (FDM). MATERIALS AND METHODS: 10 stone models were acquired for the control group by scanning a complete arch model. For the experimental groups, 10 PolyJet models and 10 FDM models were fabricated from digital impressions using an intraoral scanner. All 30 models were then scanned, and root mean square values were measured using three-dimensional (3D) analysis software...
2018: International Journal of Computerized Dentistry
Sigmar Schnutenhaus, Valerie von Koenigsmarck, Sarah Blender, Laura Ambrosius, Ralph G Luthardt, Heike Rudolph
OBJECTIVE: The insertion of implants through template-guided surgery is an established method. At the present time, the static navigation is based on sleeves integrated into the guides, through which drill bits of the corresponding size are passed. The present clinical trial is designed to test a new sleeveless system to determine the precision of implant insertion for one-piece ceramic implants. MATERIALS AND METHODS: For 12 patients, implant bed preparation and the insertion of the implants were done using a sleeveless implant guide...
2018: International Journal of Computerized Dentistry
Philip L B Tan, Danielle M Layton, Susan L Wise
Implant placement requires precise planning and execution to avoid collision with critical anatomical structures. Technology advances may improve placement outcomes. The purpose of this study was to trial and measure in an in vitro environment the accuracy of placing a single dental implant in the planned position using a specific guided surgery technique compared with a freehand surgery technique. The dental model of a patient missing tooth 16 was printed 30 times (EnvisionTEC 3Dent). Each print was scanned (TRIOS color scanner) to create a 3D surface model, and radiographed (Gendex CB-500) to create cone beam computed tomography (CBCT) data...
2018: International Journal of Computerized Dentistry
Florian Beuer
No abstract text is available yet for this article.
2018: International Journal of Computerized Dentistry
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
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
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
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
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
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
Bernd Kordaß
No abstract text is available yet for this article.
2018: International Journal of Computerized Dentistry
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
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
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
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
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
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