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https://www.readbyqxmd.com/read/28078781/a-novel-conversion-method-for-radiographic-guide-into-surgical-guide
#1
Yao-Te Peng, Chung-Chih Tseng, Yi-Chun Du, Yen-Nien Chen, Chih-Han Chang
BACKGROUND: The study proposed a novel method for converting a radiographic guide into a surgical guide and evaluated its accuracy. MATERIALS AND METHODS: Radiographic guide was reformed with the addition of index rods for geometric conversion method (GCM). Planning implants were projected on geometric projection planes, and the implant positions were measured. The radiographic guide was converted into surgical guide using a generic bench drill machine with GCM data...
January 11, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28074260/accuracy-and-reproducibility-of-measurements-on-plaster-models-and-digital-models-created-using-an-intraoral-scanner
#2
Leonardo Tavares Camardella, Hero Breuning, Oswaldo de Vasconcellos Vilella
AIM: The purpose of the present study was to evaluate the accuracy and reproducibility of measurements made on digital models created using an intraoral color scanner compared to measurements on dental plaster models. METHODS: This study included impressions of 28 volunteers. Alginate impressions were used to make plaster models, and each volunteers' dentition was scanned with a TRIOS Color intraoral scanner. Two examiners performed measurements on the plaster models using a digital caliper and measured the digital models using Ortho Analyzer software...
January 10, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28065704/alveolar-bone-level-changes-in-maxillary-expansion-treatments-assessed-through-cbct
#3
Vi Pham, Manuel O Lagravère
OBJECTIVES: Determine changes in alveolar bone levels during expansion treatments as assessed through cone-beam computer tomography (CBCT). METHODS: Sixty-one patients from Edmonton, Canada, with maxillary transverse deficiencies were split into three groups. One group was treated with a bone-anchored expander, another group was treated with a tooth-borne maxillary expander (Hyrax) and one group was untreated. CBCTs were obtained from each patient at two time points (initialT1 and at removal of appliance after 6 months T2)...
January 5, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28049672/exploring-how-u-s-dental-schools-teach-removal-of-carious-tissues-during-cavity-preparations
#4
Marcelle M Nascimento, Linda S Behar-Horenstein, Xiaoying Feng, Sandra Guzmán-Armstrong, Margherita Fontana
Approaches for managing carious tissues during cavity preparations vary considerably among clinicians, which may reflect inconsistencies in the teaching of this subject by dental schools. The aims of this study were to investigate practices related to the preclinical and clinical teaching of caries removal at U.S. dental schools and the relationship between that teaching and requirements for U.S. dental licensure examinations. The electronic survey included questions about terminology, methods, instruments and materials, treatment planning, criteria for clinical exams, faculty calibration sessions, and licensure exams...
January 2017: Journal of Dental Education
https://www.readbyqxmd.com/read/28046473/su-c-206-03-metal-artifact-reduction-in-x-ray-computed-tomography-based-on-local-anatomical-similarity
#5
X Dong, X Yang, J Rosenfield, E Elder, A Dhabaan
PURPOSE: Metal implants such as orthopedic hardware and dental fillings cause severe bright and dark streaking in reconstructed CT images. These artifacts decrease image contrast and degrade HU accuracy, leading to inaccuracies in target delineation and dose calculation. Additionally, such artifacts negatively impact patient set-up in image guided radiation therapy (IGRT). In this work, we propose a novel method for metal artifact reduction which utilizes the anatomical similarity between neighboring CT slices...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28032048/radiographic-technical-quality-of-root-canal-treatment-performed-by-undergraduate-dental-students-at-the-academy-dental-teaching-hospital-umst-sudan
#6
Elhadi M Awooda, Reem I Siddig, Ruaa S Alturki, Nada M Sanhouri
AIM: To radiographically evaluate the technical quality of root canal treatment performed by undergraduate dental students and compare the findings with other institution's work. MATERIALS AND METHODS: A retrospective, cross-sectional study was conducted at the Academy Dental Teaching Hospital involving postoperative periapical radiographs of patients who were endodontically treated by batch #14 undergraduate dental students of final year (2013-2014) from UMST, Sudan...
November 2016: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28029496/accuracy-of-the-estimation-of-dental-age-in-comparison-with-chronological-age-in-a-spanish-sample-of-2641-living-subjects-using-the-demirjian-and-nolla-methods
#7
María Melo, Javier Ata-Ali
Age estimation is an important procedure in forensic medicine and is carried out for a number of reasons. For living persons, age estimation is performed in order to assess whether a child has attained the age of criminal responsibility, in scenarios involving rape, kidnapping or marriage, in premature births, adoption procedures, illegal immigration, pediatric endocrine diseases and orthodontic malocclusion, as well as in circumstances in which the birth certificate is not available or the records are suspect...
October 12, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28018985/northern-chinese-dental-ages-estimated-from-southern-chinese-reference-datasets-closely-correlate-with-chronological-age
#8
Hai Ming Wong, Yi Feng Wen, Jayakumar Jayaraman, Jing Li, Ling Sun, Nigel Martyn King, Graham J Roberts
While northern and southern Chinese are genetically correlated, there exists notable environmental differences in their living conditions. This study aimed to evaluate validity of the southern Chinese reference dataset for dental age estimation applied to northern Chinese. Dental panoramic tomographs of 437 northern Chinese aged 3 to 21 years were analysed. All the left maxillary and mandibular permanent teeth plus the 2 third molars on the right side were scored based on Demirjian's classification of tooth development stages...
December 2016: Heliyon
https://www.readbyqxmd.com/read/28001246/validation-and-invariance-of-the-dental-anxiety-scale-in-a-brazilian-sample
#9
Fernanda Salloume Sampaio Bonafé, Juliana Alvares Duarte Bonini Campos
The aim of this study was to evaluate the properties of the Dental Anxiety Scale (DAS) when applied to Brazilian adults and to test its invariance across independent samples and different sociodemographic groups. Sociodemographic data, reports on previous unpleasant dental experiences and DAS responses were collected through telephone interviews. Metric properties of the one and two-factor models were evaluated using confirmatory factor analysis. The analysis included the chi-square ratio divided by degrees of freedom (χ2/df), the comparative fit index (CFI), the goodness of fit index (GFI) and the root mean square error of approximation (RMSEA)...
December 22, 2016: Brazilian Oral Research
https://www.readbyqxmd.com/read/27909868/dental-age-estimation-in-the-living-after-completion-of-third-molar-mineralization-new-data-for-gustafson-s-criteria
#10
M Timme, W H Timme, A Olze, C Ottow, S Ribbecke, H Pfeiffer, R Dettmeyer, A Schmeling
There is a need for dental age estimation methods after completion of the third molar mineralization. Degenerative dental characteristics appear to be suitable for forensic age diagnostics beyond the 18th year of life. In 2012, Olze et al. investigated the criteria studied by Gustafson using orthopantomograms. The objective of this study was to prove the applicability and reliability of this method with a large cohort and a wide age range, including older individuals. For this purpose, 2346 orthopantomograms of 1167 female and 1179 male Germans aged 15 to 70 years were reviewed...
December 1, 2016: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/27907980/flipped-clinical-training-a-structured-training-method-for-undergraduates-in-complete-denture-prosthesis
#11
Anbarasi K, Kasim Mohamed K, Phagalvarthy Vijayaraghavan, Deivanayagam Kandaswamy
PURPOSE: To design and implement flipped clinical training for undergraduate dental students in removable complete denture treatment and predict its effectiveness by comparing the assessment results of students trained by flipped and traditional methods. METHODS: Flipped training was designed by shifting the learning from clinics to learning center (phase I) and by preserving the practice in clinics (phase II). In phase I, student-faculty interactive session was arranged to recap prior knowledge...
December 2016: Korean Journal of Medical Education
https://www.readbyqxmd.com/read/27890318/the-mandibular-molar-pit-tubercle-mmpt-dental-nonmetric-trait-comprehensive-analysis-of-a-large-sample
#12
Luís Miguel Marado, Ana Maria Silva
Dental nonmetric traits are quasicontinous variables, mostly of genetic origin. Thus, sets of such traits allow biological distance estimation between samples. Mandibular molar pit-tubercle (MMPT) is a buccal trait defined by Weets (2009) in Irish samples. This study aims to analyze (a) trait frequencies, (b) grade definitions, (c) intraobserver error, (d) sexual dimorphism, (e) asymmetry, and (f) trait associations for MMPT in a Portuguese sample. The first (LM1), second (LM2) and third (LM3) lower molars of 600 identified individuals from the Coimbra collections were scored for MMPT in three scoring sessions...
December 2016: Homo: Internationale Zeitschrift Für die Vergleichende Forschung Am Menschen
https://www.readbyqxmd.com/read/27883287/definition-classification-and-retrospective-analysis-of-photostimulable-phosphor-image-artefacts-and-errors-in-intraoral-dental-radiography
#13
Armagan Caliskan, Ayse Pinar Sumer
OBJECTIVES: To detect and determine image error and artefact types in intraoral radiographs obtained with PSP technology, place them in an appropriate classification and retrospectively analyse the PSP specific image errors and artefacts. The causes and solutions of PSP specific errors and artefacts have also been discussed. METHODS: The radiographic database of the Ondokuz Mayıs University, Faculty of Dentistry, Department of Dentomaxillofacial Radiology was used for this study...
November 24, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27866699/recording-the-trajectory-of-mouth-opening-and-closing-for-the-fabrication-of-an-occlusal-splint
#14
Jong-Eun Kim, Joo Hyun Kwon, Jee-Hwan Kim, June-Sung Shim
Various attempts have been made to transfer the transverse hinge axis and mandibular movement pattern to the mechanical articulator and to fabricate dental prostheses with the fewest errors. However, the occlusal adjustment of a dental prosthesis is always necessary to ensure a precise intraoral fit even when the facebow transfer technique is used in the cast mounting procedure. This is because the true hinge axis is not obtained when the facebow is applied to a patient who exhibits a variable mandible movement pattern rather than a single rotational axis...
November 17, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27861137/computer-assisted-system-on-mandibular-canal-detection
#15
Da-Chuan Cheng, Li-Wei Chen, Yen-Wen Shen, Lih-Jyh Fuh
BACKGROUND: A dentist always checks a patient by using panoramic radiography (PR) initially. The measurement of the minimal distance (MD) between the alveolar crest and the mandibular canal (MC) superior border is critically important before the dental implant surgery, extraction of 3rd molar teeth or any surgery in the posterior area of minimal distance (MD). However, the image of MC is not always clear to identify. OBJECTIVE: A software is needed for training dentists as well as a tool of demonstration to patients in clinics precisely and quickly...
November 18, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27859228/testing-a-novel-3d-printed-radiographic-imaging-device-for-use-in-forensic-odontology
#16
Tara L Newcomb, Ann M Bruhn, Bridget Giles, Hector M Garcia, Norou Diawara
There are specific challenges related to forensic dental radiology and difficulties in aligning X-ray equipment to teeth of interest. Researchers used 3D printing to create a new device, the combined holding and aiming device (CHAD), to address the positioning limitations of current dental X-ray devices. Participants (N = 24) used the CHAD, soft dental wax, and a modified external aiming device (MEAD) to determine device preference, radiographer's efficiency, and technique errors. Each participant exposed six X-rays per device for a total of 432 X-rays scored...
January 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/27848202/prevalence-of-enamel-defects-and-association-with-dental-caries-in-preschool-children
#17
C Massignan, M Ximenes, C da Silva Pereira, L Dias, M Bolan, M Cardoso
AIM: This was to evaluate the prevalence of the developmental defects of enamel (DDE) in primary teeth and its association with dental caries. METHODS: A cross-sectional study with a randomised representative sample was carried out with 1101 children aged 2-5 years enrolled in public preschools (50% prevalence of DDE in primary teeth, a standard error of 3%, and a confidence level of 95%). Three calibrated dentists (K > 0.62) performed clinical examination...
December 2016: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/27833792/effects-of-co2-laser-irradiation-on-matrix-rich-biofilm-development-formation-an-in-vitro-study
#18
Bruna Raquel Zancopé, Vanessa B Dainezi, Marinês Nobre-Dos-Santos, Sillas Duarte, Vanessa Pardi, Ramiro M Murata
BACKGROUND: A carbon dioxide (CO2) laser has been used to morphologically and chemically modify the dental enamel surface as well as to make it more resistant to demineralization. Despite a variety of experiments demonstrating the inhibitory effect of a CO2 laser in reduce enamel demineralization, little is known about the effect of surface irradiated on bacterial growth. Thus, this in vitro study was preformed to evaluate the biofilm formation on enamel previously irradiated with a CO2 laser (λ = 10...
2016: PeerJ
https://www.readbyqxmd.com/read/27833341/minimizing-relapse-in-mandibular-asymmetry-correction-by-bssro-with-intentional-osteotomy-of-distal-segment-a-prospective-study
#19
R Vimalraj, N Jayakumar, K George Varghese, S Mohan, Bobby John, Somil Chhag
INTRODUCTION: Surgical correction of the patients with mandibular asymmetry by bilateral sagittal split ramus osteotomy (BSSRO) creats remarkable results in the immediate post operative period, but it carries a high risk of relapse by powerful muscle forces and the osteotomized segments. To minimize this risk, literatures highlight the procedure of an intentional osteotomy and stripping of muscles. A prospective study was conducted in Government Dental College, Kottayam, Kerala, to assess the effect of intentional osteotomy of posterior part of distal segment and stripping of medial pterygoid muscle on the proximal segment on affected side in mandibular asymmetry patients treated with BSSRO...
December 2016: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/27829760/faulty-radiographs-a-cross-sectional-analysis-among-dental-college-students-in-namakkal-district-tamil-nadu-india
#20
S Elangovan, M Nazargi Mahabob, Suman Jaishankar, B Senthil Kumar, Deepika Rajendran
AIM: The aim of this study was to assess the ability of taking and processing of intraoral periapical radiographs (IOPA) by the dental college undergraduate students and also to evaluate the impact of teaching on their skills. MATERIALS AND METHODS: This study was conducted in the OMRD department. Final year students (52) and interns (41) of 2014 were included in this study. In this 1 year study, 13104 IOPAs were taken and manually processed by these students. These radiographs were evaluated by two senior faculties of the department separately...
October 2016: Journal of Pharmacy & Bioallied Sciences
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