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Dental errors

A J E Smith
In the dental practice, several situations that might lead to conflict are imaginable. How a dentist deals with a conflict depends in part on the importance he places on the content of the conflict in relation to the importance of the relationship with the patient. This article briefly describes 5 conflict management styles. On the basis of case histories, suggestions are made for handling situations when a conflict leads to aggression, you are facing sexual intimidation or a conflict develops with a demanding patient...
February 2019: Nederlands Tijdschrift Voor Tandheelkunde
N Xiao, Y C Sun, Y J Zhao, Y Wang
OBJECTIVE: To establish a reference dental model used for trueness evaluation of photo-curing 3D printing technologies, and to establish a multidimensional trueness evaluation method based on the reference dental model, which can yield a comprehensive objective evaluating result. METHODS: A reference dental model was designed in 3ds Max 2018 software based on the statistical analysis results of dental crown and dental arch of Chinese population in previous studies in order to simulate a real dental model...
February 18, 2019: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Nisa Gül Amuk, Erol Karsli, Gokmen Kurt
OBJECTIVE: Comparison of dental measurements between conventional plaster models, digital models obtained by impression scanning and plaster model scanning. PURPOSE: To evaluate and to compare the accuracy and reliability of tooth size, arch width and Bolton tooth size discrepancy measurements on 3 Dimensional (3D) digital models obtained by plaster dental model scanning, dental impression scanning and conventional plaster models. MATERIAL AND METHODS: This study was carried out on the maxillary and mandibular dental models of 25 patients with Angle Class I molar relationship and minimal crowding...
February 13, 2019: International Orthodontics
Sang-Hoon Kang, Chan-Seung Kim, Ji-Yeon Lee
OBJECTIVES: This study analyzed the accuracy of digital occlusion settings for maxillofacial surgery simulation using occlusal contact points obtained from dental cast models. METHODS: Twenty-nine paired dental cast models of patients were used. The orthodontist set the dental cast for postoperative planned occlusion in the articulator. In the experimental group, a digital dental cast was placed in the occlusion state between the maxillary cast and the mandibular cast by the paired points matching method according to the more than four paired occlusal contact points...
February 11, 2019: Oral Radiology
Jong-Eun Kim, Young-Bum Park, June-Sung Shim, Hong-Seok Moon
PURPOSE: To evaluate differences in implant placement accuracy depending upon the presence or absence of metal restorations, as well as between distal extension and tooth-end cases. MATERIALS AND METHODS: Five experimental groups were designed with mandibular models exhibiting the following dental statuses: six anterior teeth and bilateral second molars, with bilaterally edentulous sites between them (group NN); six anterior teeth (group NDE); identical to group NN, with the six anterior teeth restored with metal crowns (group MN); identical to group NDE, with the six anterior teeth restored with metal crowns (group MDE); identical to group NN, with all remaining teeth restored with metal crowns (group MM)...
February 4, 2019: International Journal of Oral & Maxillofacial Implants
Jorge Zaragoza-Siqueiros, Hugo I Medellin-Castillo, Héctor de la Garza-Camargo, Theodore Lim, James M Ritchie
Conventional Orthognathic surgery (OGS) planning involves cephalometric analyses and dental casts to be mounted on an articulator. Dental segments are subsequently identified, cut and repositioned to allow the fabrication of intraoral wafers that guide the positioning of the osteotomy bone segments. This conventional planning introduces many inaccuracies that affect the post-surgery outcomes. Although computer technologies have advanced computational tools for OGS planning, they have failed in providing a practical solution...
February 4, 2019: Computer Methods in Biomechanics and Biomedical Engineering
A de Cassia Silva Azevedo, E Michel-Crosato, M G Haye Biazevic
Age estimation is guided by the evaluation of events that happen during the processes of bone and dental development. The purpose of this study was to validate the method of age estimation proposed by Lajolo et al. (2013) through oro-cervical radiographic indices in Brazilians. The study aimed to verify the effectiveness of age estimation equations through dental and cervical vertebrae examinations, in addition to including dental and cervical vertebrae data in new age estimation equations. The sample consisted of panoramic radiographs and teleradiographs from 510 subjects (8-24...
December 1, 2018: Journal of Forensic Odonto-stomatology
S Periyakaruppan, M A Meundi, C M David
Unavailability of chronological age brings to the forefront the importance of age estimation for human identification. Dental age is routinely assessed based on the calcification stages and/or the eruption of teeth, which exhibit wide variations amongst different ethnic groups. The current study aimed at estimating the dental ages in 384 South Indian subjects aged 6-21 years, using clinical and radiographic methods and comparing the predictive accuracy of these two dental age estimation methods. For the estimation of age by clinical method, Foti and co-workers' mathematical Model 2 was employed and for the radiographic method, Chaillet and Demirjian's method with Acharya's Indian formula was used...
December 1, 2018: Journal of Forensic Odonto-stomatology
Zhanli Hu, Changhui Jiang, Fengyi Sun, Qiyang Zhang, Yongshuai Ge, Yongfeng Yang, Xin Liu, Hairong Zheng, Dong Liang
PURPOSE: In recent years, health risks concerning high-dose X-ray radiation have become a major concern in dental computed tomography (CT) examinations. Therefore, adopting low-dose computed tomography (LDCT) technology has become a major focus in the CT imaging field. One of these LDCT technologies is downsampling data acquisition during low-dose X-ray imaging processes. However, reducing the radiation dose can adversely affect CT image quality by introducing noise and artifacts in the resultant image that can compromise diagnostic information...
January 29, 2019: Medical Physics
Shane J McCrea, Mark Troy
Background: Mandibular Asymmetry has been analysed in diverse, non-Caucasian groups, principally children. No large-scale analysis has been carried out on non-syndromic Caucasian adults. Aims: To evaluate the prevalence and severity of mandibular asymmetry; to identify gender differences and evaluate side predominance, where no actual patient concern was reported and no surgery was being contemplated. Materials and Methods: Dental records of 437 patients were analysed...
July 2018: Annals of Maxillofacial Surgery
Daniel Zweifel, Marius Gustav Bredell, Martin Lanzer, Claudio Rostetter, Martin Rücker, Stephan Studer
PURPOSE: Dental rehabilitation in patients receiving free flap reconstructive surgery on the mandible or maxilla is an important part of bringing patients back to normality in both a physical and psychological way. It is therefore important to be able to do this in the fastest way possible. Virtual preplanned reconstructions of jaws with implants placed simultaneously are a good way to expedite this process and have the advantage of allowing true backward planning to achieve bone placement where it prosthetically needs to be...
December 31, 2018: Journal of Oral and Maxillofacial Surgery
Saoirse O'Toole, Cecilie Osnes, David Bartlett, Andrew Keeling
OBJECTIVES: Alignment procedures have yet to be standardised and may influence the measurement outcome. This investigation assessed the accuracy of commonly used alignment techniques and their impact on measurement metrics. METHODS: Datasets of 10 natural molar teeth were created with a structured-light model-scanner (Rexcan DS2, Europac 3D, Crewe). A 300μm depth layer was then digitally removed from the occlusal surface creating a defect of known size. The datasets were duplicated, randomly repositioned and re-alignment attempted using a "best-fit" alignment, landmark-based alignment or reference alignment in Geomagic Control (3D Systems, Darmstadt, Germany)...
January 22, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
Karolina Brunius Enlund, Carl Brunius, Jeanette Hanson, Ragnvi Hagman, Odd Viking Höglund, Pia Gustås, Ann Pettersson
BACKGROUND: Dental disease is one of the most common health problems in dogs. However, no studies have investigated the attitudes, opinions and practices of dog owners, veterinarians and veterinary nurses regarding dental health and preventative dental home care in dogs. The objective of this study was therefore to develop and validate questionnaires for this purpose, in accordance with survey methodology guidelines. METHODS: Questionnaire items were determined based on the authors' academic knowledge and clinical experience, and modified throughout the validation process...
2019: PloS One
Allison Buchanan, Amelia Orta, Sajitha Kalathingal
OBJECTIVES: The aim of this study was to describe a quality assurance issue, that is, the production of nondiagnostic high-contrast radiographs when imaging teeth restored with all-zirconia crowns on bitewing radiographs. STUDY DESIGN: All-zirconia crowns were imaged with DIGORA Optime photostimulable phosphor (PSP) plates (Soredex/Orion Corp., Helsinki, Finland). To assess the differences in software processing, the PSP plates were scanned into third-party software as well as directly into the twain and native software provided by the manufacturer...
December 31, 2018: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Phillip Roe, Kitichai Rungcharassaeng, Joseph Y Kan, Armand Putra
Computer-aided design and computer-aided manufacturing (CAD-CAM) surgical guides can be used by the clinician and dental technician to create a definitive cast before surgery, thereby allowing an indirect interim restoration to be fabricated. However, the accurate transfer of the interim restoration from the laboratory to the surgical site requires a precise interface between components. This article reports the prosthetic significance of adhesive residue on the intaglio surface of the CAD-CAM surgical guide sleeve, which can create errors in the implant analog position of the definitive cast...
January 17, 2019: Journal of Prosthetic Dentistry
Sepideh Karkouti Oskoe, James L Drummond, Karl J Rockne
We measured the push-out and diametral tensile strength of dental restorative composites following aging under environmental conditions relevant to the oral cavity; air (A), artificial saliva (AS), acidified (50 mM CH3 COOH, pH = 4.7) artificial saliva (AS + HAc), and AS with esterase enzyme (AS + ENZ). Cylindrical test specimens (6.3 mm diameter by 5.1 mm long) were prepared by placing 0.3 g of nanofilled composite in an epoxy ring and cured. Twenty samples were aged in each environment for 163-186 days at 37°C...
January 12, 2019: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Jessica M Gross, Heather J H Edgar
OBJECTIVES: Our objective is to assess the informativeness of dental morphology in estimating biogeographic ancestry in African Americans. MATERIALS AND METHODS: The data are 62 dental morphological traits scored as nondichotomized and dichotomized in 797 individuals, 992,601 SNPs from 270 individuals, and 645 STRs from 177 individuals. Each dataset consists of Africans, Europeans, and African Americans. For each dataset, we summed Fisher Information (FI), then used STRUCTURE to estimate ancestry...
January 12, 2019: American Journal of Physical Anthropology
Syed Hammad Ahsan, Abdul Qadir Abdul Wahid, Safiah Alali, Adhwaa ALlqadhi, Zainab Alnakly, Mohammad Al-Turki, Mohammad Abu Hassan, Abdullah Almarshd
OBJECTIVE: To identify potential shortcoming(s) in relevance to patient safety culture at dental clinics. METHODS: The cross-sectional study was conducted from March to June 2016 at two clinics of a dental teaching college in Riyadh, Saudi Arabia, and comprised subjects who had either direct or indirect contact with patients in the dental clinics. The subjects were handed over a questionnaire based on the Patient Safety Culture Hospital Questionnaire. SPSS 21 was used for data analysis...
January 2019: JPMA. the Journal of the Pakistan Medical Association
Se-Wook Pyo, Young-Jun Lim, Ki-Tae Koo, Jungwon Lee
The purpose of this review is to examine various assessment methods in order to compare the accuracy between the virtually planned and clinically achieved implant positions. In this review, comparison methods using pre- and post-operative computed topography (CT) data and digital impressions for definitive prosthesis will be described. The method for the displacement and strain for quantification of the error will also be explored. The difference between the planned and the actual implant placement position in guided implant surgery is expressed as an error...
January 7, 2019: Journal of Clinical Medicine
Mayuri Kerr, Neil Park, David Leeson, Sergey Nikolskiy
STATEMENT OF PROBLEM: Accuracy in impression making may be enhanced by digitizing the physical impression directly and thereby be unhampered by errors introduced by gypsum casts. PURPOSE: The purpose of this in vitro study was to compare the dimensional accuracy of microcomputed tomography (micro-CT) scans of impressions with that of optical scans of impressions and gypsum casts. MATERIAL AND METHODS: A titanium maxillary cast with 3 metrology-grade ruby spheres in place of 3 teeth was used as a reference...
January 4, 2019: Journal of Prosthetic Dentistry
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