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https://www.readbyqxmd.com/read/28601188/the-quality-of-fixed-prosthodontic-impressions-an-assessment-of-crown-and-bridge-impressions-received-at-commercial-laboratories
#1
Clayton T Rau, Vilhelm G Olafsson, Alex J Delgado, André V Ritter, Terry E Donovan
BACKGROUND: The authors evaluated and quantified clinically detectable errors commonly seen in impressions sent to commercial laboratories and determined possible relationships between finish line errors and other factors involved. METHODS: The authors visited 3 large and 1 small commercial dental laboratories over a 12-month period. Three calibrated examiners evaluated the impressions. The examiners evaluated all impressions for errors by using ×2.5 magnification loupes under ambient room lighting without the aid of additional illumination...
June 7, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28599689/aspartic-acid-racemization-with-correlation-to-age-aforensic-perspective
#2
Qudsia Hassan, Allah Rakha, M Zahid Bashir
OBJECTIVE: To estimate age through aspartic acid racemization of human dentin for forensic analysis, and to calculate the margin of error between chronological age and estimated age by racemization method. STUDY DESIGN: Cross-sectional comparative study. PLACE AND DURATION OF STUDY: Dental Outpatients' Department, Ziauddin Hospital, Karachi, from 2011 to 2014. METHODOLOGY: Patients from dental orthodontics department were selected...
May 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28598860/translational-motion-correction-algorithm-for-truncated-cone-beam-ct-using-opposite-projections
#3
Jawook Gu, Woong Bae, Jong Chul Ye
BACKGROUND: Cone-beam computed tomography (CBCT) is widely used in various medical imaging applications, including dental examinations. Dental CBCT images often suffer from motion artifacts caused by involuntary rigid motion of patients. However, earlier motion compensation studies are not applicable for dental CBCT systems using truncated detectors. OBJECTIVE: This study proposes a novel motion correction algorithm that can be applied for truncated dental CBCT images...
June 3, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28581062/dental-evidence-for-wild-tuber-processing-among-titicaca-basin-foragers-7000-ybp
#4
James T Watson, Randall Haas
OBJECTIVES: The objective of this work is to characterize dental wear in a skeletal sample dating to the Middle/Late Archaic period transition (8,000-6,700 cal. B.P.) from the Lake Titicaca Basin, Peru to better define subsistence behaviors of foragers prior to incipient sedentism and food production. MATERIALS AND METHODS: The dental sample consists of 251 teeth from 11 individuals recovered from the site of Soro Mik'aya Patjxa (SMP), the earliest securely dated burial assemblage in the Lake Titicaca Basin and the only burial assemblage in the region from an unequivocal forager context...
June 5, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28555157/accuracy-evaluation-of-a-stereolithographic-surgical-template-for-dental-implant-insertion-using-3d-superimposition-protocol
#5
Corina Marilena Cristache, Silviu Gurbanescu
THE AIM: of this study was to evaluate the accuracy of a stereolithographic template, with sleeve structure incorporated into the design, for computer-guided dental implant insertion in partially edentulous patients. MATERIALS AND METHODS: Sixty-five implants were placed in twenty-five consecutive patients with a stereolithographic surgical template. After surgery, digital impression was taken and 3D inaccuracy of implants position at entry point, apex, and angle deviation was measured using an inspection tool software...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28530318/-severe-infantile-hypophosphatasia
#6
Evgenia Gurevich, Daniel Landau
Hypophosphatasia is the inborn error of metabolism that is characterized by low serum alkaline-phosphatase activity, due to loss-of-function mutations within the gene for tissuenonspecific isoenzyme of alkaline phosphatase [TNSALP]. The manifestations of hypophosphatasia range from neonatal death with almost no skeletal mineralization to dental problems in adults without any bone symptoms. There are no case reports of infantile hypophosphatasia in Israel. The existence of enzymatic replacement treatment for this disease makes it important to diagnose this problem as soon as possible...
January 2017: Harefuah
https://www.readbyqxmd.com/read/28526091/a-pre-therapeutic-coating-for-medical-devices-that-prevents-the-attachment-of-candida-albicans
#7
Diego Vargas-Blanco, Aung Lynn, Jonah Rosch, Rony Noreldin, Anthony Salerni, Christopher Lambert, Reeta P Rao
BACKGROUND: Hospital acquired fungal infections are defined as "never events"-medical errors that should never have happened. Systemic Candida albicans infections results in 30-50% mortality rates. Typically, adhesion to abiotic medical devices and implants initiates such infections. Efficient adhesion initiates formation of aggressive biofilms that are difficult to treat. Therefore, inhibitors of adhesion are important for drug development and likely to have a broad spectrum efficacy against many fungal pathogens...
May 19, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28509869/experimental-approach-for-the-uncertainty-assessment-of-3d-complex-geometry-dimensional-measurements-using-computed-tomography-at-the-mm-and-sub-mm-scales
#8
Roberto Jiménez, Marta Torralba, José A Yagüe-Fabra, Sinué Ontiveros, Guido Tosello
The dimensional verification of miniaturized components with 3D complex geometries is particularly challenging. Computed Tomography (CT) can represent a suitable alternative solution to micro metrology tools based on optical and tactile techniques. However, the establishment of CT systems' traceability when measuring 3D complex geometries is still an open issue. In this work, an alternative method for the measurement uncertainty assessment of 3D complex geometries by using CT is presented. The method is based on the micro-CT system Maximum Permissible Error (MPE) estimation, determined experimentally by using several calibrated reference artefacts...
May 16, 2017: Sensors
https://www.readbyqxmd.com/read/28504354/new-methodology-to-reconstruct-in-2-d-the-cuspal-enamel-of-modern-human-lower-molars
#9
Mario Modesto-Mata, Cecilia García-Campos, Laura Martín-Francés, Marina Martínez de Pinillos, Rebeca García-González, Yuliet Quintino, Antoni Canals, Marina Lozano, M Christopher Dean, María Martinón-Torres, José María Bermúdez de Castro
OBJECTIVES: In the last years different methodologies have been developed to reconstruct worn teeth. In this article, we propose a new 2-D methodology to reconstruct the worn enamel of lower molars. Our main goals are to reconstruct molars with a high level of accuracy when measuring relevant histological variables and to validate the methodology calculating the errors associated with the measurements. METHODS: This methodology is based on polynomial regression equations, and has been validated using two different dental variables: cuspal enamel thickness and crown height of the protoconid...
May 15, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28501863/psychometric-properties-of-the-revised-illness-perception-questionnaire-for-oral-health
#10
Fredy H Villalobos-Galvis, Ana C Mafla, William F Burbano-Trujillo, Alexandra A Sanchez-Figueroa
AIMS: The aim of this study was to test the hypothesis that, for patients with dental caries, the Spanish version of the Revised Illness Perception Questionnaire for Oral Health (IPQ-R-OH) has 7 dimensions, including personal and treatment control, timeline-acute/chronic and timeline-cyclical, illness coherence, consequences, and emotional representations. METHODS: A Spanish adaptation of the IPQ-R, with a self-reported 38-item scale, was developed. Exploratory and confirmatory factor analyses were conducted using data from 520 patients with dental caries attending the Dental Clinic at Universidad Cooperativa de Colombia, Pasto, Colombia...
2017: Caries Research
https://www.readbyqxmd.com/read/28496274/student-self-assessment-and-faculty-assessment-of-performance-in-an-interprofessional-error-disclosure-simulation-training-program
#11
Therese I Poirier, Junvie Pailden, Ray Jhala, Katie Ronald, Miranda Wilhelm, Jingyang Fan
Objectives. To conduct a prospective evaluation for effectiveness of an error disclosure assessment tool and video recordings to enhance student learning and metacognitive skills while assessing the IPEC competencies. Design. The instruments for assessing performance (planning, communication, process, and team dynamics) in interprofessional error disclosure were developed. Student self-assessment of performance before and after viewing the recordings of their encounters were obtained. Faculty used a similar instrument to conduct real-time assessments...
April 2017: American Journal of Pharmaceutical Education
https://www.readbyqxmd.com/read/28490844/attitudes-of-dental-professional-staff-and-auxiliaries-in-riyadh-saudi-arabia-toward-disclosure-of-medical-errors
#12
Nora S Al-Nomay, Abdulghani Ashi, Aljohara Al-Hargan, Abdulaziz Alshalhoub, Emad Masuadi
AIM: To collect empirical data on the attitudes of dental professionals and dental auxiliaries in Riyadh, Saudi Arabia, regarding the disclosure of medical errors. METHODS: A cross-sectional study was conducted, involving the administration of a questionnaire to a sample of 586 participants recruited from over 10 government and private dental institutions in Riyadh between August 2015 and January 2016. The questionnaire collected information regarding participant opinions on (a) personal beliefs, norms, and practices regarding medical errors, (b) the nature of errors that should be disclosed, and (c) who should disclose errors...
April 2017: Saudi Dental Journal
https://www.readbyqxmd.com/read/28490470/metal-artifact-reduction-of-ct-scans-to-improve-pet-ct
#13
Charlotte S van der Vos, Anne Ij Arens, Jim Hamill, Christian Hofmann, Vladimir Y Panin, Antoi Pw Meeuwis, Eric P Visser, Lioe-Fee de Geus-Oei
In recent years different metal artifact reduction (MAR) methods have been developed for computed tomography (CT). These methods have only recently been introduced for positron emission tomography/computed tomography (PET/CT) even though they could be beneficial for interpretation, segmentation and quantification of the PET/CT images. In this study, phantom and patient scans were analyzed visually and quantitatively to measure the effect on PET images of iterative metal artifact reduction (iMAR) of CT data...
May 10, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28482440/-study-on-the-appropriate-parameters-of-automatic-full-crown-tooth-preparation-for-dental-tooth-preparation-robot
#14
F S Yuan, Y Wang, Y P Zhang, Y C Sun, D X Wang, P J Lyu
Objective: To further study the most suitable parameters for automatic full crown preparation using oral clinical micro robot. Its purpose is to improve the quality of automated tooth preparing for the system and to lay the foundation for clinical application. Methods: Twenty selected artificial resin teeth were used as sample teeth. The micro robot automatic tooth preparation system was used in dental clinic to control the picosecond laser beam to complete two dimensional cutting on the resin tooth sample according to the motion planning path...
May 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28474536/comments-on-an-overview-of-protocols-for-the-neural-induction-of-dental-and-oral-stem-cells-in-vitro-article-in-tissue-engineering-part-b-heng-et-al-february-2016-doi-10-1089-ten-teb-2015-0488
#15
Orsolya Pall, Bela Varga Varga, Pierre-Yves Collart-Dutilleul, Csilla Gergely, Frédéric Cuisinier
We read with interest the review of Heng et al.(2016). The article summarizes a wide range of protocols about the in vitro neurodifferentiation of different dental and oral stem cells. Our research group is also interested in the study of neurogenic potential of dental pulp stem cells, so we were pleased to find such a detailed and comprehensive review about this topic. Unfortunately when reading carefully the article, we observed numerous errors regarding for example the quantity of the products in several protocols...
May 5, 2017: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/28458408/detection-of-the-mandibular-canal-in-orthopantomography-using-a-gabor-filtered-anisotropic-generalized-hough-transform
#16
Darian Onchis-Moaca, Simone Zappalá, Smaranda Laura Goţia, Pedro Real, Marius Pricop
In this paper, we explore the possibility of applying the anisotropic generalized Hough transform (AGHT) enhanced with a Gabor based time-frequency filtering (GTF) for the determination of the mandibular canal in digital dental panoramic radiographs. The proposed method is based on template matching using the fact that the shape of the mandibular canal is usually the same, followed by a filtering of the accumulator space in the Gabor domain for a precise detection of the position. The proposed procedure consists of a detailed description of the shape of the canal in its canonical form and on preserving Gabor filtering information for sorting the hierarchy of location candidates after applying anisotropically the extraction algorithm...
November 1, 2016: Pattern Recognition Letters
https://www.readbyqxmd.com/read/28457590/accuracy-of-maxillary-repositioning-by-computer-aided-orthognathic-surgery-in-patients-with-normal-temporomandibular-joints
#17
Xiaozhen Lin, Biao Li, Xudong Wang, Steve G F Shen
Our aim was to assess the accuracy of computer-aided orthognathic surgery for maxillary repositioning in 15 patients with mandibular hyperplasia and normal temporomandibular joints (TMJ). We aligned preoperative and postoperative virtual skulls at the cranium using surface superimposition then recorded and calibrated three 3-dimensional coordinates (maxillary dental landmarks U0, 6R, and 6L) on the skulls. Errors between these preoperative and postoperative landmarks were calculated and the largest error of every patient was chosen for assessment...
April 27, 2017: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/28425209/identification-of-dynamic-load-for-prosthetic-structures
#18
Dequan Zhang, Xu Han, Zhongpu Zhang, Jie Liu, Chao Jiang, Nobuhiro Yoda, Xianghua Meng, Qing Li
Dynamic load exists in numerous biomechanical systems and its identification signifies a critical issue for characterizing dynamic behaviors and studying biomechanical consequence of the systems. This study aims to identify dynamic load in the dental prosthetic structures, namely three-unit implant-supported fixed partial denture (I-FPD) and teeth-supported fixed partial denture (T-FPD). The three-dimensional (3D) finite element (FE) models were constructed through patient's computerized tomography (CT) images...
April 20, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28399461/measurement-of-open-apices-in-tooth-roots-in-colombian-children-as-a-tool-for-human-identification-in-asylum-and-criminal-proceedings
#19
REVIEW
Marcela Rivera, Stefano De Luca, Lina Aguilar, Luz Andrea Velandia Palacio, Ivan Galić, Roberto Cameriere
Dental age estimation was recognized as an imperative issue in clinical and medico-legal practice. However, very few studies on dental age estimation in children have been published in Colombia. This study evaluated the accuracy of Cameriere's method of measurement of open apices on tooth roots in a sample of 526 digital panoramic radiographs (OPTs) of children (274 boys and 252 girls), aged between 6 and 14 years, from Bogotá, Valle del Cauca, Buga and Villavicencio, in Southwest Colombia. Only first seven permanent lower teeth, except third molar, from the left side of mandible were studied...
April 6, 2017: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/28390466/a-nomogram-for-calculation-of-maximum-recommended-dose-by-volume-of-local-anesthetic-in-pediatric-dentistry
#20
David Williams, Theodore Splaver, Jason Walker
PURPOSE: Calculation of maximum recommended doses for local anesthetic agents and added vasopressors is complex and error-prone with potentially fatal consequences. The purpose of this investigation was to develop a nomogram to calculate the maximum recommended doses, expressed as volumes (number of cartridges or ml) of local anesthetic for healthy U.S. pediatric dental patients based on body weight, and test its accuracy and reproducibility. METHODS: Standard mathematical techniques were used to draft the nomogram...
March 15, 2017: Pediatric Dentistry
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