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https://www.readbyqxmd.com/read/29850512/computerized-casts-for-orthodontic-purpose-using-powder-free-intraoral-scanners-accuracy-execution-time-and-patient-feedback
#1
Maria Francesca Sfondrini, Paola Gandini, Maurizio Malfatto, Francesco Di Corato, Federico Trovati, Andrea Scribante
Introduction: Intraoral scanners allow direct images of oral situation, with fewer steps than conventional impressions. The purpose of this study was to compare the accuracy of digital impressions, traditional impressions, and digitalization of full-arch gypsum models, to evaluate timing of different methods and finally to study perception of patients about conventional and digital impression techniques. Methods: Dental arches of fourteen patients were evaluated by alginate impression, titanium dioxide powder-free intraoral scanning (Trios, 3Shape), and digitalization obtained from gypsum models using the same scanner...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29722937/a-novel-methodology-to-validate-the-accuracy-of-extraoral-dental-scanners-and-digital-articulation-systems
#2
A Ellakwa, S Elnajar, D Littlefair, G Sara
PURPOSE: The aim of the current study is to develop a novel method to investigate the accuracy of 3D scanners and digital articulation systems. MATERIALS AND METHODS: An upper and a lower poured stone model were created by taking impression of fully dentate male (fifty years old) participant. Titanium spheres were added to the models to allow for an easily recognisable geometric shape for measurement after scanning and digital articulation. Measurements were obtained using a Coordinate Measuring Machine to record volumetric error, articulation error and clinical effect error...
May 30, 2018: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/29602345/comparison-of-digital-intraoral-scanners-and-alginate-impressions-time-and-patient-satisfaction
#3
Jennifer A Burzynski, Allen R Firestone, F Michael Beck, Henry W Fields, Toru Deguchi
INTRODUCTION: Recent technological advances have made intraoral scans and digital models a possibility and a promising alternative to conventional alginate impressions. Several factors should be examined when considering an intraoral scanner, including patient acceptance and efficiency. The objectives of this study were to assess and compare patient satisfaction and time required between 2 intraoral scanners and conventional alginate impressions. METHODS: An initial pilot study was completed to create a valid and reliable survey instrument that would measure 3 areas of patient satisfaction with the impression experience...
April 2018: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29578802/comparative-analysis-of-three-dimensional-nasal-shape-of-casts-from-patients-with-unilateral-cleft-lip-and-palate-treated-at-two-institutions-following-rotation-advancement-only-iowa-or-nasoalveolar-molding-and-rotation-advancement-in-conjunction-with-primary
#4
Banafsheh Hosseinian, Marcie S Rubin, Sean A P Clouston, Asma Almaidhan, Pradip R Shetye, Court B Cutting, Barry H Grayson
OBJECTIVES: To compare 3-dimensional nasal symmetry in patients with UCLP who had either rotation advancement alone or nasoalveolar molding (NAM) followed by rotation advancement in conjunction with primary nasal repair. DESIGN: Pilot retrospective cohort study. MATERIALS AND METHODS: Nasal casts of 23 patients with UCLP from 2 institutions were analyzed; 12 in the rotation advancement only group (Iowa) and 11 in the NAM, rotation advancement with primary nasal repair group (New York)...
January 1, 2018: Cleft Palate-craniofacial Journal
https://www.readbyqxmd.com/read/29518805/comparison-of-accuracy-between-a-conventional-and-two-digital-intraoral-impression-techniques
#5
Junaid Malik, Jose Rodriguez, Michael Weisbloom, Haralampos Petridis
PURPOSE: To compare the accuracy (ie, precision and trueness) of full-arch impressions fabricated using either a conventional polyvinyl siloxane (PVS) material or one of two intraoral optical scanners. MATERIALS AND METHODS: Full-arch impressions of a reference model were obtained using addition silicone impression material (Aquasil Ultra; Dentsply Caulk) and two optical scanners (Trios, 3Shape, and CEREC Omnicam, Sirona). Surface matching software (Geomagic Control, 3D Systems) was used to superimpose the scans within groups to determine the mean deviations in precision and trueness (μm) between the scans, which were calculated for each group and compared statistically using one-way analysis of variance with post hoc Bonferroni (trueness) and Games-Howell (precision) tests (IBM SPSS ver 24, IBM UK)...
March 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29514564/reproducibility-of-the-index-of-orthognathic-functional-treatment-need-scores-derived-from-plaster-study-casts-and-their-three-dimensional-digital-equivalents-a-pilot-study
#6
Emma McCrory, Niall Jp McGuinness, Aman Ulhaq
OBJECTIVE: To determine the reproducibility of Index of Orthognathic Functional Treatment Need (IOFTN) scores derived from plaster casts and their three-dimensional (3D) digital equivalents. DESIGN: Pilot study, prospective analytical. SETTING: UK hospital orthodontic department. PARTICIPANTS: Thirty casts and their digital equivalents, representing the pre-treatment malocclusions of patients requiring orthodontic-orthognathic surgical treatment, were scored by four clinicians using IOFTN...
March 7, 2018: Journal of Orthodontics
https://www.readbyqxmd.com/read/29503715/a-comparison-of-the-accuracy-of-intraoral-scanners-using-an-intraoral-environment-simulator
#7
Hye-Nan Park, Young-Jun Lim, Won-Jin Yi, Jung-Suk Han, Seung-Pyo Lee
PURPOSE: The aim of this study was to design an intraoral environment simulator and to assess the accuracy of two intraoral scanners using the simulator. MATERIALS AND METHODS: A box-shaped intraoral environment simulator was designed to simulate two specific intraoral environments. The cast was scanned 10 times by Identica Blue (MEDIT, Seoul, South Korea), TRIOS (3Shape, Copenhagen, Denmark), and CS3500 (Carestream Dental, Georgia, USA) scanners in the two simulated groups...
February 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29497334/marginal-accuracy-of-computer-aided-design-and-computer-aided-manufacturing-fabricated-full-arch-zirconia-restoration
#8
Niwut Juntavee, Issarawas Sirisathit
Objective: This study evaluated marginal accuracy of full-arch zirconia restoration fabricated from two digital computer-aided design and computer-aided manufacturing (CAD-CAM) systems (Trios-3 and CS3500) in comparison to conventional cast metal restoration. Materials and methods: A stainless steel model comprising two canine and two molar abutments was used as a master model for full-arch reconstruction. The canine and molar abutments were machined in a cylindrical shape with 5° taper and chamfer margin...
2018: Clinical, Cosmetic and Investigational Dentistry
https://www.readbyqxmd.com/read/29483739/-evaluation-of-accuracy-of-virtual-occlusal-definition-in-angle-class-i-molar-relationship
#9
L Wu, X J Liu, Z L Li, X Wang
OBJECTIVE: To evaluate the accuracy of virtual occlusal definition in non-Angle class I molar relationship, and to evaluate the clinical feasibility. METHODS: Twenty pairs of models of orthognathic patients were included in this study. The inclusion criteria were: (1) finished with pre-surgical orthodontic treatment and (2) stable final occlusion. The exclusion criteria were: (1) existence of distorted teeth, (2) needs for segmentation, (3) defect of dentition except for orthodontic extraction ones, and (4) existence of tooth space...
February 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29476599/evaluation-of-the-effect-scan-pattern-has-on-the-trueness-and-precision-of-six-intraoral-digital-impression-systems
#10
Anthony S Mennito, Zachary P Evans, Abigail W Lauer, Ravi B Patel, Mark E Ludlow, Walter G Renne
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...
March 2018: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29430612/comparison-of-two-intraoral-scanners-based-on-three-dimensional-surface-analysis
#11
Kyung-Min Lee
BACKGROUND: This in vivo study evaluated the difference of two well-known intraoral scanners used in dentistry, namely iTero (Align Technology) and TRIOS (3Shape). METHODS: Thirty-two participants underwent intraoral scans with TRIOS and iTero scanners, as well as conventional alginate impressions. The scans obtained with the two intraoral scanners were compared with each other and were also compared with the corresponding model scans by means of three-dimensional surface analysis...
February 12, 2018: Progress in Orthodontics
https://www.readbyqxmd.com/read/29428522/evaluation-of-the-fit-of-zirconia-copings-fabricated-by-direct-and-indirect-digital-impression-procedures
#12
Bora Lee, Kyung Chul Oh, Daewon Haam, Joon-Hee Lee, Hong-Seok Moon
STATEMENT OF PROBLEM: Intraoral scanners are effective for direct digital impression when dental restorations are fabricated using computer-aided design and computer-aided manufacturing (CAD-CAM); however, if the abutment tooth cannot be dried completely or the prepared margin is placed subgingivally, accurate digital images cannot always be guaranteed. PURPOSE: The purpose of this in vitro study was to compare the internal and marginal discrepancies of zirconia copings fabricated directly using an intraoral scanner with those fabricated indirectly with impression scanning...
February 7, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29423969/a-clinical-comparative-study-of-3-dimensional-accuracy-between-digital-and-conventional-implant-impression-techniques
#13
Mohammed Hussein M Alsharbaty, Marzieh Alikhasi, Simindokht Zarrati, Ahmed Reza Shamshiri
PURPOSE: To evaluate the accuracy of a digital implant impression technique using a TRIOS 3Shape intraoral scanner (IOS) compared to conventional implant impression techniques (pick-up and transfer) in clinical situations. MATERIALS AND METHODS: Thirty-six patients who had two implants (Implantium, internal connection) ranging in diameter between 3.8 and 4.8 mm in posterior regions participated in this study after signing a consent form. Thirty-six reference models (RM) were fabricated by attaching two impression copings intraorally, splinted with autopolymerizing acrylic resin, verified by sectioning through the middle of the index, and rejoined again with freshly mixed autopolymerizing acrylic resin pattern (Pattern Resin) with the brush bead method...
February 9, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29395944/comparing-the-reliability-and-accuracy-of-clinical-measurements-using-plaster-model-and-the-digital-model-system-based-on-crowding-severity
#14
Yu-Ming Liang, Lalita Rutchakitprakarn, Shou-Hsin Kuang, Tzu-Ying Wu
BACKGROUND: This study aims to clarify whether 3Shape™ digital model system could be applied in orthodontic diagnostic analysis with certainty, especially under different crowding condition. Reliability, accuracy and efficiency of 3Shape™ digital model system were assessed by comparing them with traditional plaster cast. METHODS: 29 plaster casts with permanent dentition were transformed into digital models by 3Shape™ D800 scanner. All 29 models were categorized into mild-crowding (arch length discrepancy <3 mm), moderate-crowding (arch length discrepancy >3 mm and <8 mm), and severe-crowding group (arch length discrepancy >8 mm)...
January 25, 2018: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/29315068/-is-the-precision-of-intraoral-digital-impressions-in-orthodontics-enough
#15
Romain Duvert, Sarah Gebeile-Chauty
INTRODUCTION: Replacing impression by intraoral camera is a paradigm shift. However no in vivo independent studies have compared the accuracy of analog impressions with three systems of digital impression. Are digital recordings precise enough for our orthodontic practices? MATERIALS AND METHODS: Five impressions of the maxillary and mandibular arch of the same subject were conducted in vinylpolysiloxane, cast in plaster type IV then scanned by a laboratory scanner (VPS group)...
December 2017: L' Orthodontie Française
https://www.readbyqxmd.com/read/29246490/accuracy-and-precision-of-3-intraoral-scanners-and-accuracy-of-conventional-impressions-a-novel-in-vivo-analysis-method
#16
R Nedelcu, P Olsson, I Nyström, J Rydén, A Thor
OBJECTIVE: To evaluate a novel methodology using industrial scanners as a reference, and assess in vivo accuracy of 3 intraoral scanners (IOS) and conventional impressions. Further, to evaluate IOS precision in vivo. METHODS: Four reference-bodies were bonded to the buccal surfaces of upper premolars and incisors in five subjects. After three reference-scans, ATOS Core 80 (ATOS), subjects were scanned three times with three IOS systems: 3M True Definition (3M), CEREC Omnicam (OMNI) and Trios 3 (TRIOS)...
February 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/28863884/how-accurate-are-implant-surgical-guides-produced-with-desktop-stereolithographic-3-dimentional-printers
#17
George R Deeb, Riley K Allen, V Patrick Hall, Daniel Whitley, Daniel M Laskin, Sompop Bencharit
PURPOSE: The use of tooth-supported static stereolithographic guides has greatly improved the ability to ideally place implants. This study was designed to determine the accuracy of in office-printed implant surgical guides. MATERIALS AND METHODS: Using 3shape Implant Studio, a treatment plan for implant placement for tooth 8 was developed using a digital intraoral scan from a Trios scanner and cone-beam computed tomography. Ten stereolithographic guides were printed using a Form2 3-dimensional printer...
December 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28816292/-precision-of-three-dimensional-printed-brackets
#18
D Zhang, L C Wang, Y H Zhou, X M Liu, J Li
OBJECTIVE: This study was based on digital orthodontic diagnosis work flow for indirect bonding transfer tray model design and three-dimensional (3D) printing, and the aim of this paper was to inspect the dimensional accuracyof 3D printed brackets, which is the foundation of the follow up work and hoped that will illuminate the clinical application of the digital orthodontics work flow. METHODS: The samples which consisted of 14 cases of patients with malocclusion from Department of Orthodontics Peking University were selected, including 8 cases with tooth extraction and 6 cases without tooth extraction...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28792965/method-to-evaluate-the-noise-of-3d-intra-oral-scanner
#19
Alban Desoutter, Osama Yusuf Solieman, Gérard Subsol, Hervé Tassery, Frédéric Cuisinier, Michel Fages
In dentistry, 3D intra-oral scanners are gaining increasing popularity essentially for the production of dental prostheses. However, there is no normalized procedure to evaluate their basic performance and enable comparisons among intra-oral scanners. The noise value highlights the trueness of a 3D intra-oral scanner and its capacity to plan prosthesis with efficient clinical precision. The aim of the present study is to develop a reproducible methodology for determining the noise of an intra-oral scanner. To this aim, and as a reference, an ultra-flat and ultra-smooth alumina wafer is used as a blank test...
2017: PloS One
https://www.readbyqxmd.com/read/28771886/alternative-method-to-evaluate-the-adaptation-of-implant-supported-multi-unit-prosthetic-frameworks
#20
Ying Zhou, Yong Li, Xiao Ma, Yiqing Huang, Jiawei Wang
PURPOSE: Various methods to evaluate the adaptation of dental prostheses are available; however, only a few of these methods assess the adaptation of the framework as a whole. This study aimed to propose an alternative method to evaluate the adaptation of implant-supported multi-unit Co-Cr alloy frameworks. MATERIALS AND METHODS: A four-unit framework supported by two implants was designed using a computer. Six dots with a diameter of 0.2 mm were designed randomly using 3Shape software on the abutment surface of the framework for measurement...
August 3, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
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