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digital impression

Manabu Kanazawa, Maiko Iwaki, Toshio Arakida, Shunsuke Minakuchi
PURPOSE: This article describes the protocol of a digital impression technique to make an impression and recording of the jaw relationship of edentulous patients for the fabrication of CAD/CAM custom tray using computer-aided design and manufacturing (CAD/CAM) technology. METHODS: Scan the maxillary and mandibular edentulous jaws using an intraoral scanner. Scan the silicone jig with the maxillary and mandibular jaws while keeping the jig between the jaws. Import the standard tessellation language data of the maxillary and mandibular jaws and jig to make a jaw relation record and fabricate custom trays (CAD/CAM trays) using a rapid prototyping system...
March 16, 2018: Journal of Prosthodontic Research
Fernanda Ferruzzi Lima, Constantino Fernandes Neto, José H Rubo, Gildo Coelho Santos, Maria Jacinta Moraes Coelho Santos
STATEMENT OF PROBLEM: Factors that may affect the marginal adaptation of computer-aided design and computer-aided manufacturing (CAD-CAM) restorations include preparation design, impression technique, and CAD-CAM system. The influence of impression technique and preparation design on CAD-CAM partial coverage restorations has not been fully addressed. PURPOSE: The purpose of this in vitro study was to investigate the influence of direct and indirect digital impression techniques and 2 preparation designs on the marginal adaptation of CAD-CAM onlays...
March 15, 2018: Journal of Prosthetic Dentistry
Vladimir Ovchinnik, Berfin Karatas, Burak Yilmaz, Edwin A McGlumphy
This clinical report describes the prosthetic and surgical management of a patient with a restricted oral orifice due to a perioral burn. Complete oral rehabilitation was achieved with maxillary and mandibular implant-supported fixed prostheses using a combination of digital and conventional impressions, design, and processing techniques.
March 15, 2018: Journal of Prosthetic Dentistry
Hamad S AlRumaih, Abdulaziz AlHelal, Nadim Z Baba, Charles J Goodacre, Ali Al-Qahtani
STATEMENT OF PROBLEM: Clinical studies have identified advantages of digital complete denture technology including patient satisfaction, improved mastication, increased retention, and technique efficiency. However, studies that focusing on the effect of denture adhesive on the retention of milled and heat-activated denture bases are lacking. PURPOSE: The purpose of this clinical study was to evaluate the effectiveness of denture adhesive on the retention of milled and heat-activated denture bases...
March 15, 2018: Journal of Prosthetic Dentistry
David Anssari Moin, Bassam Hassan, Daniel Wismeijer
PURPOSE: To evaluate the feasibility of a commercially available immediate root analog implant system Replicate (Natural Dental Implants). MATERIALS AND METHODS: Five consecutive patients in need of an implant in the premolar region were recruited for this pilot study. Following clinical examination, a cone beam computed tomography scan was made and the dental impressions digitized. On the basis of the superimposition of these datasets, a three-dimensional (3D) envelope was created for the selected tooth...
March 2018: International Journal of Oral & Maxillofacial Implants
Woong Ki Kim, Sunjai Kim
STATEMENT OF PROBLEM: Because of their relatively small scanning area, intraoral scanners may result in less accurate fixed dental prostheses (FDPs) than do laboratory scanners. PURPOSE: The purpose of this in vitro study was to evaluate the accuracy of monolithic zirconia FDPs with different numbers of pontics fabricated with different impression techniques. MATERIAL AND METHODS: The mandibular right premolars and molars of an acrylic resin model were prepared to receive 4-unit FDPs...
March 8, 2018: Journal of Prosthetic Dentistry
Ju-Hyoung Lee
Due to the increased esthetic demands, custom zirconia post-and-cores have recently become popular. A post-and-core pattern with acrylic resin or wax is scanned using a laboratory scanner for the design of a definitive post-and-core restoration. This procedure requires additional time and material handling experience. If a scan post is used for an intracanal digital impression, substantial initial investments for hardware and software are required. This article introduces an alternative technique for fabricating a custom zirconia post-and-core with a conventional impression...
March 8, 2018: Journal of Prosthetic Dentistry
Xueyin An, Jing-Huan Fang, Seung-Mi Jeong, Byung-Ho Choi
An interim restoration is a prototype for the definitive prosthesis and preserves the occlusal information and the original vertical dimension of the occlusion. Several techniques have been developed to transfer the information from implant-supported fixed interim to definitive restoration. However, these conventional techniques have limitations, and they are time-consuming, require making impressions and stone casts, and mounting in an articulator. The purpose of this article was to describe a digital technique to accurately transfer the information from complete-arch implant interim restoration to definitive restorations without using definitive casts...
March 8, 2018: Journal of Prosthetic Dentistry
Yiqin Fang, Jing-Huan Fang, Seung-Mi Jeong, Byung-Ho Choi
Few studies have reported the application of digital technology for the process of impression and interocclusal recordings in edentulous patients. This article describes a digitizing system for generating digital edentulous models with a jaw relationship by taking direct digital impressions and a virtual bite registration using intraoral digital scanning. A specialized scan retractor was used to make digital impressions of edentulous jaws in patients' mouths using an intraoral scanner. Virtual bite registration was obtained with optical scanning of the buccal surfaces of both jaws at the occlusal vertical dimension...
March 9, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Paolo Pesce, Francesco Pera, Paolo Setti, Maria Menini
PURPOSE: To evaluate the accuracy and precision of a digital scanner used to scan four implants positioned according to an immediate loading implant protocol and to assess the accuracy of an aluminum framework fabricated from a digital impression. MATERIALS AND METHODS: Five master casts reproducing different edentulous maxillae with four tilted implants were used. Four scan bodies were screwed onto the low-profile abutments, and a digital intraoral scanner was used to perform five digital impressions of each master cast...
March 2018: International Journal of Prosthodontics
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
Christina Founta, Emmanouil Papagiannakis, Nithya Ratnavelu, Arlene Feusi, Stavros Natsis, Melissa Bradbury, Ann Fisher, Raj Naik
After treatment for cervical intraepithelial neoplasia (CIN), in the UK women who are cytology-negative, high-risk (HR) human papilloma virus (HPV) positive are referred to colposcopy. This pilot study assessed the incidence of residual/recurrent CIN and the diagnostic accuracy of colposcopy with dynamic spectral imaging (DSI) mapping in their detection.This was a prospective service evaluation carried out in a UK National Health Service (NHS) colposcopy clinic. All women, referred with negative cytology/HR-HPV positive result following treatment for CIN from March 2013 until November 2014, who were examined with the DSI digital colposcope were included...
January 2018: Medicine (Baltimore)
Fa-Bing Tan, Chao Wang, Hong-Wei Dai, Yu-Bo Fan, Jin-Lin Song
PURPOSE: The study aimed to identify the accuracy and reproducibility of preparations made by gypsum materials of various colors using quantitative and semi-quantitative three-dimensional (3D) approach. MATERIALS AND METHODS: A titanium maxillary first molar preparation was created as reference dataset (REF). Silicone impressions were duplicated from REF and randomized into 6 groups (n=8). Gypsum preparations were formed and grouped according to the color of gypsum materials, and light-scanned to obtain prepared datasets (PRE)...
February 2018: Journal of Advanced Prosthodontics
Hironari Hayama, Kenji Fueki, Juro Wadachi, Noriyuki Wakabayashi
PURPOSE: It remains unclear whether digital impressions obtained using an intraoral scanner are sufficiently accurate for use in fabrication of removable partial dentures. We therefore compared the trueness and precision between conventional and digital impressions in the partially edentulous mandible. METHODS: Mandibular Kennedy Class I and III models with soft silicone simulated-mucosa placed on the residual edentulous ridge were used. The reference models were converted to standard triangulated language (STL) file format using an extraoral scanner...
March 1, 2018: Journal of Prosthodontic Research
Leonardo Ciocca, Roberto Meneghello, Carlo Monaco, Gianpaolo Savio, Lorenzo Scheda, Maria Rosaria Gatto, Paolo Baldissara
PURPOSE: This study describes a method for measuring the accuracy of the virtual impression. METHODS: In vitro measurements according to a metrological approach were based on (1) use of an opto-mechanical coordinate measuring machine to acquire 3D points from a master model, (2) the mathematical reconstruction of regular geometric features (planes, cylinders, points) from 3D points or an STL file, and (3) consistent definition and evaluation of position and distance errors describing scanning inaccuracies...
March 2, 2018: International Journal of Computer Assisted Radiology and Surgery
Eugene Antenucci
No abstract text is available yet for this article.
March 2018: Compendium of Continuing Education in Dentistry
Alessandro Mangano, Matteo Beretta, Giuseppe Luongo, Carlo Mangano, Francesco Mangano
Objective: The objective of the present study was to compare patients' acceptability, comfort and stress with conventional and digital impressions. Materials and Methods: Thirty young orthodontic patients (15 males and 15 females) who had no previous experience of impressions were enrolled in this study. Conventional impressions for orthodontic study models of the dental arches were taken using an alginate impression material (Hydrogum® , Zhermack Spa, Badia Polesine, Rovigo, Italy)...
2018: Open Dentistry Journal
Fabian Huettig, Usama Chekhani, Andrea Klink, Fadi Said, Frank Rupp
The shark-fin test was modified to convey the clinical application of a single-step/double-mix technique assessing the behavior of two viscosities applied at one point in time. A medium and light body polyether (PE), a medium and light body polyvinylsiloxane (PVS), and a medium as well as heavy and light body vinyl polyether silicone (PVXE) impression material were analyzed solely, and in a layered mixture of 1:1 and 3:1 at working times of 50, 80, and 120 s. The fin heights were measured with a digital ruler...
February 27, 2018: Dental Materials Journal
Juraj Lipscher
This review summarizes possibilities of including scientific methods for investigation of art objects into the secondary school chemistry curriculum. We discuss methods such as X-ray radiography, infrared reflectography, neutron activation autoradiography, X-ray fluorescence, and Raman spectroscopy and provide recent examples of their use. The results obtained, especially when combined with modern digital image processing algorithms, are indeed impressive. The second part of the paper is devoted to suggestions for actual use in teaching...
February 1, 2018: Chimia
Anthony S Mennito, Zachary P Evans, 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...
February 24, 2018: Journal of Esthetic and Restorative Dentistry
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