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Dental errors

Kyung Chul Oh, Bora Lee, Young-Bum Park, Hong Seok Moon
PURPOSE: To evaluate the accuracy of 3 digitization methods for the maxillary dental arch. MATERIALS AND METHODS: A maxillary typodont with various tooth preparation designs was used as the reference model. The scanned data were classified into direct scanning (DS), cast scanning (CS), and impression scanning (IS) groups according to the techniques applied for digitization (n = 10/group). An intraoral scanner was used for the DS group. Impressions obtained with polyether impression material were scanned with a tabletop scanner for the IS group...
November 14, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Alycia Sam, Kris Currie, Heesoo Oh, Carlos Flores-Mir, Manuel Lagravere-Vich
OBJECTIVES: Conventional two-dimensional (2D) cephalometric radiography is an integral part of orthodontic patient diagnosis and treatment planning. One must be mindful of its limitations as it indeed is a 2D representation of a vaster three-dimensional (3D) object. Issues with projection errors, landmark identification, and measurement inaccuracies impose significant limitations, which may now be overcome with the advent of cone-beam computed tomography (CBCT). A systematic review of the reliability of different 3D cephalometric landmarks in CBCT imaging was conducted...
November 13, 2018: Angle Orthodontist
Margit-Ann Geibel, Benjamin Gelißen, Anna-Katinka Bracher, Volker Rasche
AIM:  Assessment of the visualization of titanium and ceramic dental implants using various isotropic three-dimensional magnetic resonance imaging (MRI) methods. MATERIALS AND METHODS:  21 dental implants (7 ceramic, 14 titanium) were scanned in vitro with a spatially isotropically resolved three-dimensional gradient echo (FFE), a turbo spin echo (SE) and an ultra-short-echo time (UTE) imaging technique. The resulting absolute volumes of the implants were quantified and the relative error to the theoretical volume was calculated...
November 12, 2018: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
Michael S McCracken, Mark S Litaker, Valeria V Gordan, Thomas Karr, Ellen Sowell, Gregg H Gilbert
PURPOSE: Some crowns returned from the laboratory are clinically unacceptable, and dentists must remake them. The objectives of this study were to: 1) quantify the remake rate of single-unit crowns; and 2) identify factors significantly associated with crown remakes and intraoral fit. MATERIALS AND METHODS: Dentists participating in the National Dental Practice-Based Research Network recruited patients needing crowns and documented fabrication techniques, patient characteristics, and outcomes...
November 9, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Mohamed Elsayed Eldib, Mohamed A A Hegazy, Myung Hye Cho, Min Hyoung Cho, Soo Yeol Lee
High-resolution imaging is essential in three-dimensional (3D) CT image-based digital dentistry. A small amount of head motion during a CT scan can degrade the spatial resolution of the images to the extent where the efficacy of 3D image-based digital dentistry is greatly compromised. We introduce a retrospective motion artifact reduction (MAR) method for dental CTs that eliminates the necessity for any external motion tracking devices. Assuming that rigid-body motions are dominant in a dental scan of a human head, we extracted motion information from the projection data...
October 26, 2018: Computers in Biology and Medicine
Gregory B Brown, G Fräns Currier, Onur Kadioglu, J Peter Kierl
INTRODUCTION: A rapidly advancing digital technology in orthodontics is 3-dimensional (3D) modeling and printing, prompting a transition from a more traditional clinical workflow toward an almost exclusively digital format. There is limited literature on the accuracy of the 3D printed dental models. The aim of this study was to assess the accuracy of 2 types of 3D printing techniques. METHODS: Digital and alginate impressions of the oral environment were collected from 30 patients...
November 2018: American Journal of Orthodontics and Dentofacial Orthopedics
S Maur, D Stsepankou, J Hesser
The image quality of dental cone-beam computed tomography (CBCT) is limited by the accuracy of device calibration. Inaccurate calibration introduces errors in the reconstruction process, which may lead to severe artifacts in the reconstructed volume. Patient motion during scan acquisition induces similar effects. This paper introduces a novel auto-calibration approach calculating geometrical projection parameters from unknown patient geometry. We formulate consistency conditions linking the information of consecutive projection images and a regularization technique to prevent overall distortions...
October 29, 2018: Physics in Medicine and Biology
Giulio Gavini, Marcelo Dos Santos, Celso Luis Caldeira, Manoel Eduardo de Lima Machado, Laila Gonzales Freire, Elaine Faga Iglecias, Ove Andrea Peters, George Táccio de Miranda Candeiro
The introduction of automated instrumentation in endodontics represented a major advance in progress for this specialty, with improvements in the quality and predictability of root canal preparation and a significant reduction in procedural errors. In recent years, endodontic instruments have undergone a series of changes brought about by modifications in design, surface treatments, and thermal treatments. In addition, new movements have also been incorporated to offer greater safety and efficiency, optimizing the properties of the NiTi alloy, especially through eccentric rotary motion...
October 18, 2018: Brazilian Oral Research
Kevin Bowles, Harjit S Sehgal, Lynn Santelmann, Edward P Pham, Richie Kohli
It is very crucial that dental students who comprise our future dental workforce are adequately trained in communication skills. This training is especially important because of the increasing population of English as Second Language (ESL) patients in our community health centers, dental offices, and dental schools. The objective of this exploratory pilot study was to analyze dental student conversations about patient treatment plans to native English and ESL patients. The study recruited four dental students who spoke English as their first language and four patients, two with English as their native language and two with English as their second language from Oregon Health & Science University School of Dentistry...
October 25, 2018: Health Communication
Kanchan P Dholam, Gurkaran Preet Singh, Sandeep V Gurav, Prabha Yadav
Existing anatomic factors play a significant role in affecting the possibility of dental rehabilitation in head and neck cancer patients undergoing free-fibular graft reconstruction. An observational, cross-sectional study was initiated to evaluate factors affecting dental rehabilitation following free-fibular graft jaw reconstruction in head and neck cancer patients.Patients who had undergone jaw reconstruction with free-fibular graft, requiring dental rehabilitation were recruited. Irradiated, reconstructed patients who had completed at least 1 year since the last dose of radiotherapy and nonradiated patients who had completed 6 months since reconstruction were recruited...
November 2018: Journal of Craniofacial Surgery
Priti Mulimani, Victor Cw Hoe, Melanie J Hayes, Jose Joy Idiculla, Adinegara Bl Abas, Laxminarayan Karanth
BACKGROUND: Dentistry is a profession with a high prevalence of work-related musculoskeletal disorders (WMSD) among practitioners, with symptoms often starting as early in the career as the student phase. Ergonomic interventions in physical, cognitive, and organisational domains have been suggested to prevent their occurrence, but evidence of their effects remains unclear. OBJECTIVES: To assess the effect of ergonomic interventions for the prevention of work-related musculoskeletal disorders among dental care practitioners...
October 15, 2018: Cochrane Database of Systematic Reviews
Jian Wang, Xuebing Bai, Miaochen Wang, Zijie Zhou, Xiaohe Bian, Che Qiu, Changyi Li, Zhao Yang, Guangcan Chen, Fang Ji, Jiang Tao
BACKGROUND: To assess the validity of the Demirjian and Willems dental age estimation methods in a population of Eastern Chinese 11-18-year-old subadults. SAMPLES AND METHODS: A total of 1622 orthopantomograms (787 boys and 835 girls) aged from 11.00 to 18.99 years old from a Chinese Han population were evaluated in the study. Dental ages were calculated using both Demirjian and Willems method. Statistical significance was set at p<0.05 and for each method, discrepancies between chronological age (CA) and dental age (DA) were statistically analyzed by paired t-tests...
September 19, 2018: Forensic Science International
Jean-Christophe Lutz, Alexandre Hostettler, Vincent Agnus, Stéphane Nicolau, Daniel George, Luc Soler, Yves Rémond
Orthognathic surgery belongs to the scope of maxillofacial surgery. It treats dentofacial deformities consisting in discrepancy between the facial bones (upper and lower jaws). Such impairment affects chewing, talking, and breathing and can ultimately result in the loss of teeth. Orthognathic surgery restores facial harmony and dental occlusion through bone cutting, repositioning, and fixation. However, in routine practice, we face the limitations of conventional tools and the lack of intraoperative assistance...
October 1, 2018: Surgical Innovation
Walter Y H Lam, Richard T C Hsung, Leo Y Y Cheng, Edmond H N Pow
OBJECTIVES: Tooth shade is crucial to patient satisfaction in aesthetic dentistry. Two-dimensional (2D) clinical photographs have been widely used to record patients' tooth shade for creation of beautiful smile. However, in the digital workflow, 3D virtual teeth models in open file format contain only mesh information with no colour. This paper describes the mapping of colour information from the intraoral photographs onto the virtual teeth model. METHODS: Intraoral photographs of occlusal and buccal views were taken using digital single lens reflex (SLR) camera with macro lens and ring flash...
September 26, 2018: Journal of Dentistry
Gioacchino Cannizzaro, Marco Cavallari, Matteo Lazzarini, Giuseppe Purello D'ambrosio, Gianluigi Scialpi, Salvatore Audino, Eugenio Velasco-Ortega, Daniela Rita Ippolito, Marco Esposito
PURPOSE: To evaluate the outcome of three (fixed-on-3 = Fo3) vs four (fixed-on-4 = Fo4) implants immediately restored with metal-resin screw-retained cross-arch prostheses in fully edentulous jaws. MATERIALS AND METHODS: Forty-eight edentulous or to be rendered edentulous patients were randomised in six centres (eight patients per centre) to the Fo3 group (24 patients: 12 maxillae and 12 mandibles) and to the Fo4 group (24 patients: 12 maxillae and 12 mandibles) according to a parallel group design...
2018: European Journal of Oral Implantology
K S Kim, S Y Kang, C K Park, G A Kim, S Y Park, Hyosung Cho, C W Seo, D Y Lee, H W Lim, H W Lee, J E Park, T H Woo, J E Oh
In cone-beam computed tomography (CBCT), reconstructed images are inherently degraded, restricting its image performance, due mainly to imperfections in the imaging process resulting from detector resolution, noise, X-ray tube's focal spot, and reconstruction procedure as well. Thus, the recovery of CBCT images from their degraded version is essential for improving image quality. In this study, we investigated a compressed-sensing (CS)-based blind deconvolution method to solve the blurring problem in CBCT where both the image to be recovered and the blur kernel (or point-spread function) of the imaging system are simultaneously recursively identified...
September 20, 2018: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
J M Colazo, J R Hu, K M Dahir, J H Simmons
Hypophosphatasia (HPP) typically manifests with fractures, tooth loss, and muscle pain. Although mental health diagnoses and neurological symptoms have not been previously well documented in HPP, they occur commonly. The recognition of non-traditional symptoms may improve patient satisfaction, preempt costly evaluation and misdiagnosis, and lead to further treatment options. INTRODUCTION: Hypophosphatasia (HPP) is an inborn error of metabolism due to deficiency of tissue non-specific alkaline phosphatase (TNSALP)...
September 13, 2018: Osteoporosis International
Hichem Nemsi, Malek Ben Daya, Nidhal Haj Salem, Fatma Masmoudi, Inès Bouanène, Fethi Maatouk, Abir Aissaoui, Ali Chadly
This study aims to evaluate and compare the applicability of three dental methods for age estimation, including Demirjian's four teeth, Willems I, and Willems II methods in a sample of Tunisian children. Panoramic radiographs of 500 children (241 females, 259 males) aged between 5 and 15 years were examined. The mean absolute error (MAE) was performed to assess the accuracy of age estimation. Independent samples t-test was employed to compare the differences, the chronological age minus dental age (CA-DA), between sexes for the three methods...
October 2018: Forensic Science International
Minah Kim, Byungyeon Kim, Byungjun Park, Minsuk Lee, Youngjae Won, Choul-Young Kim, Seungrag Lee
In this study, we developed a digital shade-matching device for dental color determination using the support vector machine (SVM) algorithm. Shade-matching was performed using shade tabs. For the hardware, the typically used intraoral camera was modified to apply the cross-polarization scheme and block the light from outside, which can lead to shade-matching errors. For reliable experiments, a precise robot arm with ±0.1 mm position repeatability and a specially designed jig to fix the position of the VITA 3D-master (3D) shade tabs were used...
September 12, 2018: Sensors
José Luis Calvo Guirado, Aldo Fabian Lucero-Sánchez, Ana Boquete Castro, Marcus Abboud, Sergio Gehrke, Manuel Fernández Dominguez, Rafael Arcesio Delgado Ruiz
The authors would like to correct following typing and two images errors [...].
September 4, 2018: Materials
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