Complete-arch accuracy of seven intraoral scanners measured by the virtual-fit method.

Objectives: This study compared the accuracy of seven intraoral scanners (IOS) by the virtual-fit method.

Methods: Four maxillary arches with tooth abutments were scanned with an industrial reference scanner (n=1) and by Aoralscan3, EmeraldS, Helios600, Lumina, Mediti700, Primescan, and Trios5 IOSs (each n=12). Two complete-arch fixed frameworks were designed on each IOS scan with a 70 µm (group 70) and a 90 µm internal cement space (group 70+20, additional 20 µm at the margin).

Translucency of chairside monolithic zirconias using different sintering ovens: An in vitro investigation.

Objective: To evaluate the translucency of several monolithic zirconias (MZ) processed in various sintering ovens designed for single-visit, chairside use.

Methods: Discs (n = 40) from zirconia blocks were fabricated for each MZ at manufacturer-recommended minimal thicknesses, as provided in each material's instructions for use: IPS e.max ZirCAD LT (ZLT); CEREC Zirconia+ (CZ+); 3M Chairside (3M); KATANA Zirconia (KT).

Application of the virtual-fit method for fixed complete denture cases designed on intraoral scans: Effect of cement spacing.

Objectives: To validate the virtual-fit alignment, analyze the impact of cement spacing on internal/marginal gaps, and correlate results with conventional trueness measures.

Methods: Four dental abutment models were scanned using an industrial reference scanner (one time each), Emerald S (three times each), and Medit i700 (three times each) intraoral scanners (IOS). On each IOS scan (n = 24), three complete-arch fixed frameworks were designed with 70 or 140 µm cement space with no marginal space (groups 70 and 140) and 70 µm with an additional 20 µm space, including the margin (group 70+20).

Trueness and precision of complete arch dentate digital models produced by intraoral and desktop scanners: An ex-vivo study.

Objectives: The study aimed to compare the trueness and precision of five intraoral scanners (Emerald S, iTero Element 5D, Medit i700, Primescan, and Trios 4) and two indirect digitization techniques for both teeth and soft tissues on fresh mandibular and maxillary cadaver jaws.

Methods: The maxilla and mandible of a fully dentate cadaver were scanned by the ATOS industrial scanner to create a master model. Then, the specimens were scanned eight times by each intraoral scanner (IOS).

Differences in Volumetric Tooth Loss for Monolithic Ceramic Crowns, Occlusal Overlays, and Partial-Coverage Onlays.

Purpose: To compare the volumetric loss of clinical crown structure in commonly encountered clinical situations for monolithic ceramic crowns, occlusal overlays, and partial-coverage onlays.

Materials And Methods: Typodont teeth made with preexisting mesio-occlusodistal (MOD) preparations for mandibular first molars and maxillary first premolars were prepared with three different preparations: a full-contour monolithic zirconia crown, a lithium disilicate occlusal overlay, and mesio-occlusodistobuccal/mesio-occlusodistolingual (MODB/MODL) lithium disilicate onlays for premolars and molars. 3D-metrologic software was used to evaluate the volumetric loss of clinical crown structure for each preparation type.

In vitro comparison of five desktop scanners and an industrial scanner in the evaluation of an intraoral scanner accuracy.

Objectives: The study aimed to compare the precision of ATOS industrial, 3ShapeE4, MeditT710, CeramillMap400, CSNeo, PlanScanLab desktop, and Mediti700 intraoral scanners. The second aim was to compare the trueness of Mediti700 assessed by ATOS and desktop scanners.

Methods: Four plastic dentate models with 7-12 abutments prepared for complete arch fixed dentures were scanned by all scanners three times.

Assessing the Antimicrobial Properties of Copper-Iodide Doped Adhesives in an Caries Model: A Pilot Study.

Context: Recurrent caries are the leading cause of composite resin failure.

Aims: The purpose of this pilot study was to test the efficacy of a novel copper iodide (CuI) containing dental adhesive in an caries model.

Subjects And Methods: and were grown individually on the complex medium for 48 h at 37°C.

3D printed implant surgical guides with internally routed irrigation for temperature reduction during osteotomy preparation: A pilot study.

Objective: The purpose of this study was to test a novel through-the-guide means of irrigation in an in-vitro bovine bone model and to explore the method clinical applicability.

Materials And Methods: Surgical guides were designed to fit over five fresh bovine samples. Control osteotomy sites were compared to experimental sites irrigated through a 3D printed surgical guide with customized channels that direct the coolant toward the interface of the alveolar crest and drill.

Evaluation of the accuracy of multiple digital impression systems on a fully edentulous maxilla.

Objective: This study aimed to compare the accuracy performance of five different intraoral scanning systems for a full-arch scan on an edentulous cadaver maxilla.

Method And Materials: Five digital intraoral impression systems were used to scan a fully edentulous cadaver maxilla. A master scan obtained with an ATOS Capsule industrial grade scanner provided the point of comparison.

Evaluation of complete-arch implant scanning with 5 different intraoral scanners in terms of trueness and operator experience.

Statement Of Problem: The intraoral scanning of the edentulous arch might be challenging for an inexperienced operator because of the large mucosal area and the use of scan bodies.

Purpose: The purpose of this ex vivo study was to compare the trueness of 5 intraoral scanners in replicating implant scan bodies and soft tissues in an edentulous maxilla and to investigate the effects of operator experience.

Material And Methods: The maxilla was resected from a fresh cadaver, 5 implants placed, and a reference scan made.

The effect of software updates on the trueness and precision of intraoral scanners.

Objectives: The goal of the study was to determine the effects of software updates on the trueness and precision of digital impressions obtained with a variety of intraoral scanner (IOS) systems.

Method And Materials: Seven IOS systems were investigated. Each system was tested using two versions of software, with the second version being the latest at the time of conducting the study.

Aerosol and spatter mitigation in dentistry: Analysis of the effectiveness of 13 setups.

Objectives: The current study aims to investigate the aerosol and spatter mitigation quality of 13 dry-field isolation methods in a simulated setup that replicates real-life work scenarios encountered in dental practices.

Methods: A crown preparation on a manikin was performed on tooth number 30 and repeated five times for each setup to simulate a patient under care. Aerosol, environmental, and operator face shield spatter, and sound intensity was measured.

Effect of Print Angulation on Surface Roughness of 3D-Printed Models.

Additive manufacturing processes are increasingly being used in dentistry. The underlying process is the polymerization or fusion of material layer by layer to create layer lines on the final printed surface. How print orientation affects these layer lines is unclear.

The digital denture replication method (DRM): a simplified method to fabricate a complete removable prosthesis.

The proposed denture replication method shows a predictable workflow for fabricating complete dentures for patients with existing dentures. The replication technique is a method of fabricating new removable complete dentures utilizing the existing prosthesis as the foundation for a new denture. The technique has some advantages such as allowing the clinician to copy the tooth shape and contours of the existing prosthesis while modifying borders and intaglio surfaces.

Evaluation of the spatter-reduction effectiveness and aerosol containment of eight dry-field isolation techniques.

Objective: The novel coronavirus that was first identified in Wuhan, China, in December 2019, created a pandemic that has the potential to change the paradigm of health care delivery. Of interest to the dental community is the presence of SARS-CoV-2 in the saliva of the affected patients that can potentially cause transmission of COVID-19 via droplets. The highly infectious nature of the pathogen has created a sense of urgency and a need for extra caution to prevent the spread of the disease and the potential infection of patients and the entire dental team.

Marginal and internal fit of full ceramic crowns milled using CADCAM systems on cadaver full arch scans.

Background: Chairside systems are becoming more popular for fabricating full-ceramic single restorations, but there is very little knowledge about the effect of the entire workflow process on restoration fit. Therefore, this study aimed to compare the absolute marginal discrepancy (AMD) and the full internal fit (FULL) of all-ceramic crowns made by two chairside systems, Planmeca FIT and CEREC, with detailed and standard mill settings.

Methods: One upper molar was prepared for an all-ceramic crown in human cadaver maxilla.

Esterase Inhibition and Copper Release from Copper Iodide Dental Adhesives - An In Vitro Study.

Purpose: To investigate whether dental adhesives modified with polyacrylic acid copper iodide particles could inhibit esterase activity in vitro and the copper release rate from resin matrices, as well as the correlation between the two variables.

Materials And Methods: Different concentrations of copper iodide (0.1, 0.

Comparing the trueness of seven intraoral scanners and a physical impression on dentate human maxilla by a novel method.

Backgrounds: Intraoral scanner (IOS) accuracy is commonly evaluated using full-arch surface comparison, which fails to take into consideration the starting position of the scanning (scan origin). Previously a novel method was developed, which takes into account the scan origin and calculates the deviation of predefined identical points between references and test models. This method may reveal the error caused by stitching individual images during intraoral scan.

The effect different substrates have on the trueness and precision of eight different intraoral scanners.

Objective: This in vitro study compares the newest generation of intraoral scanners to their older counterparts, and tests whether material substrates affect the trueness and precision of intraoral scanners (IOS).

Material And Methods: A custom model, used as the reference standard, was fabricated with teeth composed of different dental materials. The reference standard scan was obtained using a three-dimensional (3D) optical scanner, the ATOS III.

A novel method for complex three-dimensional evaluation of intraoral scanner accuracy.

Aims: The aim of this study was to compare two existing methods and one novel method for measuring the distortion of three-dimensional (3D) models created with complete-arch digital impressions, and to assess the accuracy of different scan patterns using these methods.

Materials And Methods: Maxillary and mandibular models were imaged with the PlanScan intraoral scanner using four different scan patterns. Accuracy and distortion were assessed by comparing the master scans with the intraoral scans using the following three methods: 1) Mean surface deviation was measured after complete arch superimposition; 2) 28 points were selected identically on the experimental and on the master reference models, and the deviation between identical points was assessed after superimposition over the complete arch; 3) In the case of the novel technique, the superimposition was made only at the scanning origin, and after that the 28 points were compared.

Effect of scan substrates on accuracy of 7 intraoral digital impression systems using human maxilla model.

Objective: This study aimed to determine how the accuracy of digital impressions was affected by four common dental substrates using seven prevalent IOS systems to scan the complete arch of a human maxilla.

Setting And Sample Population: The Department of Oral Rehabilitation at the Medical University of South Carolina. A single cadaver maxilla.

Evaluation of the trueness and precision of complete arch digital impressions on a human maxilla using seven different intraoral digital impression systems and a laboratory scanner.

Objectives: An impression accuracy study using a cadaver maxilla was performed using both prepared and intact teeth as well as palatal tissue.

Materials And Methods: Three crown preparations were performed on a cadaver maxilla. Seven different digital impression systems along with polyvinylsiloxane impressions were used to create digital models of the maxilla.

Effect of scan pattern on complete-arch scans with 4 digital scanners.

Statement Of Problem: Complete-arch digital scans are becoming popular as digital dentistry is adopted for expanded clinical situations such as complete-arch prostheses, removable prostheses, extensive implant-supported treatment, and orthodontic aligners. Whether the scan pattern technique affects the trueness and precision of complete-arch scans and whether differences in accuracy exist among different scanners remain unclear. Furthermore, each manufacturer recommends a different scan pattern, but evidence of the superiority of the manufacturer's recommended pattern is lacking.

Evaluation of removable partial denture frameworks fabricated using 3 different techniques.

Statement Of Problem: Rapid advancements in computer-aided design and computer-aided manufacturing (CAD-CAM) have opened new pathways in the fabrication of removable partial dentures (RPDs) through additive and subtractive processes. Questions remain whether the digital pathway is an acceptable one compared with conventional analog or combined analog and digital pathways.

Purpose: The purpose of this clinical study was to determine the quality of RPD frameworks fabricated using 3 different fabrication methods: analog, combined analog-digital, and digital.

Evaluation of the effect scan pattern has on the trueness and precision of six intraoral digital impression systems.

Objective: Clinicians have been slow to adopt digital impression technologies due possibly to perceived technique sensitivities involved in data acquisition. This research has two aims: determine whether scan pattern and sequence affects the accuracy of the three-dimensional (3D) model created from this digital impression and to compare the 5 imaging systems with regards to their scanning accuracy for sextant impressions.

Materials And Methods: Six digital intraoral impression systems were used to scan a typodont sextant with optical properties similar to natural teeth.