Research: Computeraided Technology
Effect of printing layer thickness on the trueness and fit of additively manufactured removable dies
Additive manufacturing is commonly used for the fabrication of definitive casts with removable dies. However, how the trueness and fit of removable dies are affected by printing layer thickness is lacking.Effect of layer thickness and printing orientation on the color stability and stainability of a 3D-printed resin material
Although 3-dimensional (3D)–printed resin prostheses are widely used, studies on the effects of the manufacturing parameters of 3D printing on the color stability and stainability of these prostheses are lacking.Long-term effect of gastric juice alternating with brushing on the surface roughness, topography, and staining susceptibility of CAD-CAM monolithic materials
Studies on the behavior of computer-aided design and computer-aided manufacturing (CAD-CAM) monolithic materials subjected to gastric juice alternating with brushing—as occurs in patients with bulimia nervosa—are lacking.Design parameters of polylactic acid custom trays manufactured by fused deposition modeling for partial edentulism: Consideration of the accuracy of the definitive cast
The effects of design parameters of polylactic acid (PLA) custom trays manufactured by fused deposition modeling (FDM) on the accuracy of partially edentulous definitive casts have not been thoroughly explored.Failure load of milled, 3D-printed, and conventional chairside-dispensed interim 3-unit fixed dental prostheses
New techniques and materials for the laboratory fabrication of interim fixed dental prostheses have gained in popularity, yet how their failure strengths compare with conventional chairside materials is unclear.Volumetric and dimensional accuracy assessment of CAD-CAM–manufactured dental prostheses from different materials
In computer-aided design and computer-aided manufacturing (CAD-CAM) dentistry, the CAD of the prosthesis represents the clinical prerequisite design to restore the treated tooth. However, how closely the CAM prosthesis shape matches the CAD, particularly in relation to different materials, is unclear.Trueness and precision of complete-arch photogrammetry implant scanning assessed with a coordinate-measuring machine
Photogrammetry technology has been used for the digitalization of multiple dental implants, but its trueness and precision remain uncertain.Influence of base design on the manufacturing accuracy of vat-polymerized diagnostic casts: An in vitro study
Vat-polymerized casts can be designed with different bases, but the influence of the base design on the accuracy of the casts remains unclear.Accuracy of intraoral scans: An in vivo study of different scanning devices
The accuracy of intraoral scanners is a prerequisite for the fabrication of dental restorations in computer-aided design and computer-aided manufacturing (CAD-CAM) dentistry. While the precision of intraoral scanners has been investigated in vitro, clinical data on the accuracy of intraoral scanning (IOS) are limited.Three-dimensional analysis of the accuracy of conventional and completely digital interocclusal registration methods
Compared with the frequent investigations into the accuracy of digital intraoral scans, studies analyzing digital determinations of jaw relationships based on intraoral scans are scarce.Trueness of a device for intraoral scanning to capture the angle and distance between implants in edentulous mandibular arches
The digitalization of completely edentulous arches presents limitations because of the lack of anatomic structures for best-fit alignment during the image generation process of the scanner’s software program.Accuracy of a patient 3-dimensional virtual representation obtained from the superimposition of facial and intraoral scans guided by extraoral and intraoral scan body systems
A patient 3-dimensional virtual representation aims to facilitate the integration of facial references into treatment planning or prosthesis design procedures, but the accuracy of the virtual patient representation remains unclear.Comparative study of the accuracy of an implant intraoral scanner and that of a conventional intraoral scanner for complete-arch fixed dental prostheses
Most of the available digital systems are designed to image teeth and soft tissue rather than dental implants. However, although some are marketed specifically to record implant position, whether these products are better for implant scanning is unclear.Comparison of the acquisition accuracy and digitizing noise of 9 intraoral and extraoral scanners: An objective method
The quality of the digital cast obtained from an intraoral scanner is an important comparison parameter for computer-aided design and computer-aided manufacturing (CAD-CAM) restorations. However, data on cast quality are typically provided by manufacturers, and objective evaluation of these devices is lacking.Effect of additive manufacturing process and storage condition on the dimensional accuracy and stability of 3D-printed dental casts
Additively manufactured dental casts are gaining popularity as the digital workflow is adopted in dentistry. However, studies on their dimensional accuracy and stability under different storage conditions in the dental laboratory are lacking.Trueness and precision of artificial teeth in CAD-CAM milled complete dentures with custom disks
Insufficient information is available regarding the trueness and precision of artificial teeth in computer-aided design and computer-aided manufacturing (CAD-CAM) milled complete dentures fabricated from custom disks, including prefabricated teeth.Accuracy of three digital scanning methods for complete-arch tooth preparation: An in vitro comparison
The accuracy of digital scanning for complete dental arch and implant-supported complete-arch restorations has been reported. However, research addressing the accuracy of digital scanning methods for complete-arch tooth preparation is lacking.Analysis of the influence of the facial scanning method on the transfer accuracy of a maxillary digital scan to a 3D face scan for a virtual facebow technique: An in vitro study
With the emergence of virtual articulators, virtual facebow techniques have been developed for mounting maxillary digital scans to virtual articulators. Different scanning methods can be used to obtain 3D face scans, but the influence that these methods have on the accuracy with which a maxillary digital scan is transferred to a 3D face scan is unknown.Influence of different inlay configurations and distance from the adjacent tooth on the accuracy of an intraoral scan
Clinical guidelines for obtaining accurate scan data during the intraoral scanning of inlay cavities with various configurations and interproximal distances are lacking.Correlation between 2D and 3D measurements of cement space in CAD-CAM crowns
Although the 2D analysis of prosthesis cementation space has been popular, its correlation with volumetric comparison (3D data) of cement space is unclear.Effect of layer thickness on the flexural strength of multiple-unit laser-sintered metal frameworks
Laser sintering devices have been increasingly used to fabricate the metal frameworks of metal–ceramic restorations. In the fabrication process, the sintering layer thickness is an important parameter; however, information on how it may affect the flexural strength of metal frameworks remains limited.Accuracy of impressions for multiple implants: A comparative study of digital and conventional techniques
Intraoral scanning has benefits over conventional impression making, but whether scanning is sufficiently accurate for multiple implants is unclear.Impact of laser parameters on additively manufactured cobalt-chromium restorations
The selective laser melting (SLM) process has become popular for the fabrication of frameworks for metal-ceramic restorations, although their surface roughness is greater than with cast or milled frameworks. Limited information is available regarding the surface mechanical characteristics of cobalt-chromium (Co-Cr) SLM-manufactured restorations.Evaluation of fits of metal copings fabricated by using selective laser melting at various angles
Information on the fabrication of metal by selective laser melting (SLM) systems positioned at different angles is sparse.Accuracy of six intraoral scanners for scanning complete-arch and 4-unit fixed partial dentures: An in vitro study
The digital scan accuracy of different intraoral scanners (IOSs) for long-span fixed prosthesis and the effect of the starting quadrant on accuracy is unclear.Evaluation of marginal and internal fit of lithium disilicate CAD-CAM crowns with different finish lines by using a micro-CT technique
Whether the precision of fit of computer-aided design and computer-aided manufacturing (CAD-CAM) complete crowns is affected by the finish line configuration is unclear.Accuracy of 3-dimensional printing of dental casts: A proposal for quality standardization
A digital workflow in fixed prosthodontics may use a 3D printer to obtain a cast for porcelain application. Standards exist that define the accuracy of traditional casts, but the accuracy requirements of 3D-printed casts have not been defined.Fracture resistance of additive manufactured and milled implant-supported interim crowns
Interim dental prostheses can be fabricated by using subtractive or additive manufacturing technologies. However, the fracture resistance of implant-supported interim crowns fabricated by using vat-polymerization additive manufacturing methods remains unclear.Behavior of 4 types of paper with printed QR codes for evaluating denture marking in conditions of extreme heat
Quick response (QR) codes are a fast and efficient technology for linking and accessing identifying information, and their use has been proposed in forensics. The heat resistance and esthetics of denture marking methods (DMMs) have been recommended by the American Dental Association (ADA), but studies on these aspects of printed QR codes are lacking.Effect of CAD-CAM tool deterioration on the trueness of ceramic restorations
Tools will gradually deteriorate with repetitive milling. However, tool lifetime can vary depending on the type of milling machine, the hardness of the ceramic material, and the size of the restoration. Studies evaluating the effect of tool deterioration on the trueness of milled restorations are lacking.Effect of pulp chamber depth on the accuracy of endocrown scans made with different intraoral scanners versus an industrial scanner: An in vitro study
The accuracy of intraoral scanners (IOSs) has been evaluated. However, testing their performance when scanning deep endocrown preparations is lacking.Evaluation of the accuracy of digital and 3D-printed casts compared with conventional stone casts
Digital scans present an efficient substitute for traditional dental impressions, although physical casts are still needed for some procedures, leading to the use of 3D printing in fixed prosthodontics. However, studies comparing the accuracy of 3D-printed dental casts with digital and conventional casts are sparse.Oriented face-centered cubic to hexagonal close-packed martensitic transition, grain morphology, and mechanical properties of Co-Cr alloy fabricated by selective laser melting
Removable partial dentures (RPDs) can be fabricated by selective laser melting (SLM) with different build orientations. How microstructures and mechanical properties of SLM Co-Cr alloy are affected by different build orientations is unclear.Effects of printing layer thickness on mechanical properties of 3D-printed custom trays
The layer thickness serves as a straightforward and controllable parameter to alter the mechanical properties of 3D-printed custom trays. However, how the printing layer thickness affects the mechanical properties of the trays is not fully understood.Impact of simulated toothbrushing on surface properties of chairside CAD-CAM materials: An in vitro study
Chairside computer-aided design and computer-aided manufacturing (CAD-CAM) materials that do not require any firing steps are a promising option to expedite restoration production; however, little information is available to determine the most suitable material for each clinical situation.Effect of layer thickness setting on the adaptation of stereolithography apparatus–fabricated metal frameworks for removable partial dentures: An in vitro study
A staircase effect is noted in the fabrication of metal frameworks for removable partial dentures (RPDs) when using stereolithography apparatus (SLA). It affects the adaptation of the definitive metal framework depending on the layer thickness setting. However, studies on the effect of the layer thickness setting on the adaptation of metal frameworks are lacking.Effect of varying levels of expertise on the reliability and reproducibility of the digital waxing of single crowns: A preliminary in vitro study
The digital waxing of single crowns can be affected by the quality of intraoral scans and use of computer-aided design (CAD) software programs. However, clinical outcomes of the resulting crowns are also affected by computer-aided manufacturing (CAM) methodologies. Studies on the effect of different levels of expertise on digital waxing are lacking.Trueness of intraoral scanners in digitizing specific locations at the margin and intaglio surfaces of intracoronal preparations
Studies evaluating the trueness of intraoral scanners (IOSs) at anatomic locations within an intracoronal preparation are lacking.Evaluation of the accuracy of 2 digital intraoral scanners: A 3D analysis study
Evidence for the accuracy of a recently introduced intraoral scanner is lacking.Comparison of different intraoral scanning techniques on the completely edentulous maxilla: An in vitro 3-dimensional comparative analysis
Information about the accuracy of intraoral scanners for the edentulous maxilla is lacking.Accuracy of a chairside intraoral scanner compared with a laboratory scanner for the completely edentulous maxilla: An in vitro 3-dimensional comparative analysis
Intraoral scanners are promising options for removable prosthodontics. However, analog aids, including occlusion rims, are still used, as a completely digital workflow is challenging and scientific evidence on the topic is scarce.In vitro evaluation of the accuracy and precision of intraoral and extraoral complete-arch scans
The accuracy of intraoral and extraoral scanners for different models of edentulousness is unclear.Dimensional accuracy and surface characteristics of 3D-printed dental casts
Although studies have reported the accuracy of 3D-printed dental casts, studies addressing cast distortion throughout the complete-arch range are lacking.Accuracy of complete-arch intraoral scans based on confocal microscopy versus optical triangulation: A comparative in vitro study
Fully digital dentistry is contingent on an accurate digital scan of the complete arch; however, the dimensional accuracy of different scanners for digitizing a complete arch is unclear.Vertical marginal fit of zirconia copings fabricated with one direct and three indirect digital scanning techniques
Direct digitization of the impression by using an intraoral scanner is a newly introduced technique, but studies comparing the method with other digitization techniques are lacking.Evaluation of intaglio surface trueness and margin quality of interim crowns in accordance with the build angle of stereolithography apparatus 3-dimensional printing
Studies on the intaglio surface trueness and margin quality of interim crowns fabricated using stereolithography apparatus (SLA) 3D printing depending on the type of tooth and the build angle are lacking.Scanning accuracy of nondental structured light extraoral scanners compared with that of a dental-specific scanner
Diagnostic stone casts can be digitized by using dental optical scanners based on structured light scanning technology. Nondental structured light scanning scanners could also be used; however, the accuracy of these nondental scanners remains unclear.Effects of scan body exposure and operator on the accuracy of image matching of implant impressions with scan bodies
Accurate image matching of the scan with the design of the scan body is essential to replicate the actual implant position in the software program. In situations where the scan part of the scan body is partially embedded in the gingival tissue, the influence of the scan image deficiency on the accuracy of image matching has not been clarified.Influence of scan body design on accuracy of the implant position as transferred to a virtual definitive implant cast
Previous studies have analyzed factors influencing intraoral scanner accuracy; however, how the intraoral scan body design affects the implant position on the virtual definitive cast is unclear.Does ambient light affect the accuracy and scanning time of intraoral scans?
Intraoral scanners (IOSs) are based on light-optical imaging methods. However, little is known about whether the ambient light in dental practices influences the accuracy and scanning time of the IOS.
