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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
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
Klaus Wiedhahn, Bernd Reiss, Olaf Schenk
No abstract text is available yet for this article.
2017: International Journal of Computerized Dentistry
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
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
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
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
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
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
Stefan Bubik, Michael Payer, Gerwin Arnetzl, Heike Kaltenegger, Andreas Leithner, Arnold Klampfl, Birgit Lohberger
OBJECTIVES: To prove the biocompatibility of biomaterials applied in biomedical devices, in vitro testing is crucial to render a material fit for medical application. The material of choice for dental implants is commercially pure titanium (cp-Ti), while other materials such as zirconia and polyetheretherketone (PEEK) are considered highly promising due to their functional and esthetic properties. The aim of this study was to determine whether PEEK with defined mean surface roughness and composition could achieve results equal to titanium or zirconia...
2017: International Journal of Computerized Dentistry
Gerwin Arnetzl
No abstract text is available yet for this article.
2017: International Journal of Computerized Dentistry
Andreas Kurbad
Chairside computer-aided design/computer-aided manufacturing (CAD/CAM) technology requires an effective technical basis to obtain dental restorations with optimal marginal accuracy, esthetics, and longevity in as short a timeframe as possible. This article describes a compact, 5-axis milling machine based on an innovative milling technology (5XT - five-axis turn-milling technique), which is capable of achieving high-precision milling results within a very short processing time. Furthermore, the device's compact dimensioning and state-of-the-art mode of operation facilitate its use in the dental office...
2017: International Journal of Computerized Dentistry
Karl-Friedrich Krey, Bernd Kordaß, Sebastian Ruge
The connection of a device for the registration of mandibular movements depends on the coupling of the teeth with a paraocclusal adapter. This is normally done by individualizing a prefabricated metal support, either directly on the patient or in the dental laboratory. The goal was to create an individual paraocclusal adapter by means of additive computer-assisted design/computer-assisted manufacturing (CAD/CAM) procedures, and to test it clinically. Starting from intraoral scans of the maxillary and mandibular teeth, an individual paraocclusal adapter was constructed by combining an adapter piece adapted to the tooth and jaw shape with a prefabricated standard part...
2017: International Journal of Computerized Dentistry
Kerstin Wegner, Karin Michel, Paul Henryk Seelbach, Bernd Wöstmann
Since February 2010, intraoral scanning (Lava COS system, 3M ESPE, Seefeld, Germany) has been integrated into the preclinical curriculum at the Department of Prosthodontics of the Justus Liebig University. All students were given a lecture and were trained using a guided scan exercise. After preparing three teeth (mandibular first premolars and mandibular first molar in the 4th quadrant) for cast crowns, the students were asked to scan the maxillary and mandibular teeth. Their acceptance of the new module, "Scanning," was analyzed with the use of a questionnaire (n = 108)...
2017: International Journal of Computerized Dentistry
Oliver Hartkamp, Florian Peters, Hannes Bothung, Ulrich Lohbauer, Sven Reich
AIM: The aim of this study was to evaluate the difference in maximum height loss values obtained from datasets based on optical profilometry and intraoral scanning. Additionally, two analysis applications were tested with respect to their correspondence. MATERIALS AND METHODS: To obtain baseline data, the occlusal surface of a metal phantom tooth was scanned by optical profilometry [WLP] and an intraoral scanner [IOS]. Then, wear was simulated at two locations of the tooth, three times each ([wear1], [wear2], and [wear3]), and the surface was captured after each status of wear, applying [WLP] and [IOS]...
2017: International Journal of Computerized Dentistry
Jonas Muallah, Christian Wesemann, Roxana Nowak, Jan Robben, James Mah, Peter Pospiech, Axel Bumann
The aim of this study was to compare the accuracy of six intraoral scanners as regards clinically relevant distances using a new method of evaluation. An additional objective was to compare intraoral scanners with the indirect digitization of model scanners. A resin master model was created by 3D printing and drilled in five places to reflect the following distances: intermolar width (IMW), intercanine width (ICW), and arch length (AL). To determine a gold standard, the distances were measured with a coordinate measuring instrument (Zeiss O-Inspect 422)...
2017: International Journal of Computerized Dentistry
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