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digital impression

Sandro Barone, Paolo Neri, Alessandro Paoli, Armando Viviano Razionale
Orthodontic treatments are usually performed using fixed brackets or removable oral appliances, which are traditionally made from alginate impressions and wax registrations. Among removable devices, eruption guidance appliances are used for early orthodontic treatments in order to intercept and prevent malocclusion problems. Commercially available eruption guidance appliances, however, are symmetric devices produced using a few standard sizes. For this reason, they are not able to meet all the specific patient's needs since the actual dental anatomies present various geometries and asymmetric conditions...
November 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
Laura Brandimarte, Joachim Vosgerau, Alessandro Acquisti
How does information about a person's past, accessed now, affect individuals' impressions of that person? In 2 survey experiments and 2 experiments with actual incentives, we compare whether, when evaluating a person, information about that person's past greedy or immoral behaviors is discounted similarly to information about her past generous or moral behaviors. We find that, no matter how far in the past a person behaved greedily or immorally, information about her negative behaviors is hardly discounted at all...
November 20, 2017: Journal of Experimental Psychology. General
Ahmed Afify, Stephan Haney, Ronald Verrett, Michael Mansueto, James Cray, Russell Johnson
STATEMENT OF PROBLEM: Studies evaluating the marginal adaptation of available computer-aided design and computer-aided manufacturing (CAD-CAM) noble alloys for metal-ceramic prostheses are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the vertical marginal adaptation of cast, milled, and direct metal laser sintered (DMLS) noble metal-ceramic 3-unit fixed partial denture (FDP) frameworks before and after fit adjustments. MATERIAL AND METHODS: Two typodont teeth were prepared for metal-ceramic FDP abutments...
November 15, 2017: Journal of Prosthetic Dentistry
Marzieh Alikhasi, Mohammed Hussein M Alsharbaty, Mohammad Moharrami
PURPOSE: The objective was to provide a comprehensive systematic review about the accuracy of digital implant impression in comparison with the conventional implant impression approach. MATERIALS AND METHODS: PubMed, Google Scholar and Cochrane databases were used to classify the related articles with no year limitation in 3 stages by 2 reviewers. Finally, 10 articles were included based on inclusion and exclusion criteria. RESULTS: Five articles supported the use of intraoral scanners in implant dentistry...
November 1, 2017: Implant Dentistry
Reto Hofstetter, Roland Rüppell, Leslie K John
With the advent of social media, the impressions people make on others are based increasingly on their digital disclosures. However, digital disclosures can come back to haunt, making it challenging for people to manage the impressions they make. In field and online experiments in which participants take, share, and evaluate self-photographs ("selfies"), we show that, paradoxically, these challenges can be exacerbated by temporary-sharing media-technologies that prevent content from being stored permanently...
November 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
M G Cesur, I K Omurlu, T Ozer
OBJECTIVES: The aim of this study was to evaluate the accuracy of digital models produced with the three-dimensional dental scanner, and to test the dimensional stability of alginate impressions for durations of immediately (T0), 1 day (T1), and 2 days (T2). MATERIALS AND METHODS: A total of sixty impressions were taken from a master model with an alginate, and were poured into plaster models in three different storage periods. Twenty impressions were directly scanned (negative digital models), after which plaster models were poured and scanned (positive digital models) immediately...
September 2017: Nigerian Journal of Clinical Practice
Sakshi Mehta, Sukhleen Kaur, Pradhuman Verma, Rameen Khosa, Madhu Sudan, Harpreet Kaur
AIM OF STUDY: The aim is to evaluate existence of sexual dimorphism by variation in right and left permanent maxillary molars using buccolingual width (BLW) and mesio-distal width (MDW) measured intraorally and on study casts among Sri Ganganagar population. MATERIALS AND METHODS: Fifty patients (25 males and 25 females) with 17-25 years of age were selected. Impressions of maxillary arch were taken and the BLW and MDW were measured using digital Vernier calipers on study casts and intraorally...
September 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
Nathan D Applegren, Leslie A Shock, Kristina J Aldridge, Chase D Derrick, Tomoko Tanaka, C Lynette Baker, Arshad R Muzaffar
Cranial dysmorphology observed in patients with metopic craniosynostosis varies along a spectrum of severity including varying degrees of metopic ridging, bitemporal narrowing, and trigonocephaly. Management has been based upon the subjective clinical impression of presence and severity of trigonocephaly. Severity of cranial dysmorphology does not predict the occurrence or severity of associated abnormal neurodevelopment, as children with mild-to-moderate trigonocephaly may also experience developmental delays...
October 23, 2017: Journal of Craniofacial Surgery
Sara S Johnson, Deborah A Levesque, Lynne E Broderick, Dustin G Bailey, Robert D Kerns
BACKGROUND: Chronic pain is a significant public health burden affecting more Americans than cardiovascular disease, diabetes, and cancer combined. Veterans are disproportionately affected by chronic pain. Among previously deployed soldiers and veterans, the prevalence of chronic pain is estimated between 44% and 60%. OBJECTIVE: The objective of this research was to develop and pilot-test Health eRide: Your Journey to Managing Pain, a mobile pain self-management program for chronic musculoskeletal pain for veterans...
October 17, 2017: JMIR Medical Informatics
Alan G Fraser
Our use of modern cardiovascular imaging tools has not kept pace with their technological development. Diagnostic errors are common but seldom investigated systematically. Rather than more impressive pictures, our main goal should be more precise tests of function which we select because their appropriate use has therapeutic implications which in turn have a beneficial impact on morbidity or mortality. We should practise analytical thinking, use checklists to avoid diagnostic pitfalls, and apply strategies that will reduce biases and avoid overdiagnosis...
December 1, 2017: European Heart Journal Cardiovascular Imaging
Shruti Dev, Aswini K Kar, Mirna Garhnayak, Lokanath Garhnayak, Angurbala Dhal
INTRODUCTION: Alginate is a versatile, irreversible hydrocolloid impression material, which is cost-effective and forms an essential component in dental practice. For elevating the hardness of the cast models, hardeners are combined with stone. Hence, we planned the present study to evaluate the impact of altering the time of contact between alginate and stone after various interim periods. MATERIALS AND METHODS: The present study included the assessment of impact of time of contact between alginate and stone by the construction of 90 casts using a cylinder model...
October 1, 2017: Journal of Contemporary Dental Practice
Julie T Deferm, Ruud Schreurs, Frank Baan, Robin Bruggink, Matthijs A W Merkx, Tong Xi, Stefaan J Bergé, Thomas J J Maal
OBJECTIVES: The purpose of this study was to assess the feasibility of 3D intraoral scanning for documentation of palatal soft tissue by evaluating the accuracy of shape, color, and curvature. MATERIALS AND METHODS: Intraoral scans of ten participants' upper dentition and palate were acquired with the TRIOS® 3D intraoral scanner by two observers. Conventional impressions were taken and digitized as a gold standard. The resulting surface models were aligned using an Iterative Closest Point approach...
October 6, 2017: Clinical Oral Investigations
Luis Huanca Ghislanzoni, Grethe Jonasson, Stavros Kiliaridis
BACKGROUND: Continuous physiologic eruption of teeth may become a main aesthetic issue for implants inserted in the maxillary anterior region. PURPOSE: To study maxillary tooth vertical changes during a 10 years period by 3-dimensional superimposition of digital dental casts. MATERIAL AND METHODS: Alginate impressions were taken at both baseline and at the 10-year follow-up in a sample of 24 adult Swedish women (average age of 48 years at T0)...
October 5, 2017: Clinical Implant Dentistry and related Research
Foudda R Homsy, Mutlu Özcan, Marwan Khoury, Zeina A K Majzoub
STATEMENT OF PROBLEM: The subtractive and additive computer-aided design and computer-aided manufacturing (CAD-CAM) of lithium disilicate partial coverage restorations is poorly documented. PURPOSE: The purpose of this in vitro study was to compare the marginal and internal fit accuracy of lithium disilicate glass-ceramic inlays fabricated with conventional, milled, and 3-dimensional (3D) printed wax patterns. MATERIAL AND METHODS: A dentoform mandibular first molar was prepared for a mesio-occlusal ceramic inlay...
September 29, 2017: Journal of Prosthetic Dentistry
Tony S K Mok, Sang-We Kim, Yi-Long Wu, Kazuhiko Nakagawa, Jin-Ji Yang, Myung-Ju Ahn, Jie Wang, James Chih-Hsin Yang, You Lu, Shinji Atagi, Santiago Ponce, Xiaojin Shi, Yuri Rukazenkov, Vincent Haddad, Kenneth S Thress, Jean-Charles Soria
Purpose The Iressa Mutation-Positive Multicentre Treatment Beyond ProgRESsion Study (IMPRESS) compared the continuation of gefitinib plus chemotherapy with placebo plus chemotherapy in patients with epidermal growth factor receptor ( EGFR) mutation-positive advanced non-small-cell lung cancer with progression (Response Evaluation Criteria in Solid Tumors 1.1) after first-line gefitinib. Primary results indicated no difference between treatments in terms of progression-free survival (PFS). The current analysis presents final, mature, overall survival (OS) data, together with exploratory analyses that examined whether specific biomarkers, including T790M mutation status, were able to differentiate a relative treatment effect...
October 2, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
Yolanda R Gallardo, Lauren Bohner, Pedro Tortamano, Monica N Pigozzo, Dalva C Laganá, Newton Sesma
STATEMENT OF PROBLEM: Limited evidence is available comparing digital versus conventional impressions from the point of view of patient preference. PURPOSE: The purpose of this systematic review was to identify and summarize the available literature related to patient-centered outcomes for digital versus conventional impression techniques. MATERIAL AND METHODS: The databases Medline, Cochrane, Science Direct, Scopus, and Embase were electronically searched and complemented by hand searches...
September 27, 2017: Journal of Prosthetic Dentistry
Nicola U Zitzmann, Irina Kovaltschuk, Patrik Lenherr, Philipp Dedem, Tim Joda
The aim of this randomized controlled trial was to analyze inexperienced dental students' perceptions of the difficulty and applicability of digital and conventional implant impressions and their preferences including performance. Fifty undergraduate dental students at a dental school in Switzerland were randomly divided into two groups (2×25). Group A first took digital impressions in a standardized phantom model and then conventional impressions, while the procedures were reversed for Group B. Participants were asked to complete a VAS questionnaire (0-100) on the level of difficulty and applicability (user/patient-friendliness) of both techniques...
October 2017: Journal of Dental Education
Maria Menini, Paolo Setti, Francesco Pera, Paolo Pera, Paolo Pesce
OBJECTIVES: The objective of this study was to evaluate the accuracy of different impression techniques on multiple implants. MATERIAL AND METHODS: A master cast simulating a jaw with four implants was used. Eight impression techniques were tested: open tray-polyether#1, open tray plus splint of impression copings with acrylic resin-polyether#1, closed tray-polyether#1, open tray-polyether#2, open tray-splint-polyether#2, closed tray-polyether#2, open tray-impression plaster, and digital impression (DI)...
September 30, 2017: Clinical Oral Investigations
Saurabh Chaturvedi, Mohamed Khaled Addas, Abdullah Saad Ali Al Humaidi, Abdulrazaq Mohammed Al Qahtani, Mubarak Daghash Al Qahtani
AIM: To determine the prevalence of type of soft palate in targeted population. MATERIALS AND METHODS: Using computer technology in dentistry, intraoral digital scanner, and 3D analysis software tool, study was conducted. 100 patients selected from the outpatient clinics were divided into two groups based on the ages of 20-40 years and 41-60 years with equal ratio of males and females. Each selected patient's maxillary arch was scanned with intraoral scanner; images so obtained were sectioned in anteroposterior cross section and with the 3D analysis software; the angulation between hard and soft palate was determined...
2017: International Journal of Dentistry
Vygandas Rutkūnas, Agnė Gečiauskaitė, Darius Jegelevičius, Mantas Vaitiekūnas
AIM: The use of intraoral scanners (IOS) for making digital implant impressions is increasing. However, there is a lack of evidence on the accuracy of IOS compared with conventional techniques. Therefore, the aim of this systematic review was to collect evidence on the accuracy of digital implant impression techniques, as well as to identify the main factors influencing the accuracy outcomes. MATERIALS AND METHODS: Two reviewers searched electronic databases in November, 2016...
2017: European Journal of Oral Implantology
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