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https://www.readbyqxmd.com/read/29054257/theoretical-prediction-of-pullout-strengths-for-dental-and-orthopaedic-screws-with-conical-profile-and-buttress-threads
#1
Kao-Shang Shih, Sheng-Mou Hou, Shang-Chih Lin
BACKGROUND AND OBJECTIVE: The pullout strength of a screw is an indicator of how secure bone fragments are being held in place. Such bone-purchasing ability is sensitive to bone quality, thread design, and the pilot hole, and is often evaluated by experimental and numerical methods. Historically, there are some mathematical formulae to simulate the screw withdrawal from the synthetic bone. There are great variations in screw specifications. However, extensive investigation of the correlation between experimental and analytical results has not been reported in literature...
December 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29034476/third-molor-extractions-among-australian-adults-findings-from-the-2013-national-dental-telephone-interview-survey
#2
Kamal Hanna, Paul Sambrook, Jason M Armfield, Lisa Jamieson, David S Brennan
OBJECTIVES: To identify, over the previous 12 months, whether: (i) dental insurance is associated with a higher number of third molar extractions (TME); (ii) single versus multiple TME is associated with self-rated oral health; and (iii) TME when 18-25 years of age is associated with fewer days absent from work because of dental problems. METHODOLOGY: Australia's 2013 National Dental Telephone Interview Survey, which included: socio-demographics; and number of extractions, reasons for extractions, self-rated oral health and days absent from work because of dental problems, all in the past 12 months...
October 16, 2017: International Dental Journal
https://www.readbyqxmd.com/read/29019273/dentists-use-of-digital-radiographic-techniques-part-i-intraoral-x-ray-a-questionnaire-study-of-swedish-dentists
#3
Björn Svenson, Katri Ståhlnacke, Reet Karlsson, Anna Fält
OBJECTIVE: The present study aims to gain knowledge about the dentist's use and choice of digital intraoral imaging methods. MATERIALS AND METHODS: A questionnaire sent to 2481 dentists within the Swedish Dental Society contained questions about the type of X-ray technique used, problems experienced with digital radiography, and reasons for choosing digital technology, and about indications, clinic size and type of service. Response rate was 53%. RESULTS: Ninety-eight percent of the dentists had made the transition to digital radiography; only 2% used film technique, and solid-state detector (SSD) was the most used digital technique...
October 11, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28989899/volumetric-accuracy-of-cone-beam-computed-tomography
#4
Cheol-Woo Park, Jin-Ho Kim, Yu-Kyeong Seo, Sae-Rom Lee, Ju-Hee Kang, Song-Hee Oh, Gyu-Tae Kim, Yong-Suk Choi, Eui-Hwan Hwang
PURPOSE: This study was performed to investigate the influence of object shape and distance from the center of the image on the volumetric accuracy of cone-beam computed tomography (CBCT) scans, according to different parameters of tube voltage and current. MATERIALS AND METHODS: Four geometric objects (cylinder, cube, pyramid, and hexagon) with predefined dimensions were fabricated. The objects consisted of Teflon-perfluoroalkoxy embedded in a hydrocolloid matrix (Dupli-Coe-Loid TM; GC America Inc...
September 2017: Imaging Science in Dentistry
https://www.readbyqxmd.com/read/28965893/an-investigation-in-to-the-impact-of-acquisition-location-on-error-type-and-rate-when-undertaking-panoramic-radiography
#5
A Loughlin, N Drage, C Greenall, D J J Farnell
INTRODUCTION: Panoramic radiography is a common radiographic examination carried out in the UK. This study was carried out to determine if acquisition site has an impact on image quality. METHODS: An image quality audit was carried out in South Wales across a number of dental and general radiology settings. The image quality was assessed retrospectively against national standards. A total of 174 radiographs were assessed from general radiology departments and 141 from dental radiology units...
November 2017: Radiography
https://www.readbyqxmd.com/read/28932947/integration-of-digital-dental-casts-in-cone-beam-computed-tomography-scans-a-clinical-validation-study
#6
Frits A Rangel, Thomas J J Maal, Martien J J de Koning, Ewald M Bronkhorst, Stefaan J Bergé, Anne Marie Kuijpers-Jagtman
OBJECTIVES: Images derived from cone beam computed tomography (CBCT) scans lack detailed information on the dentition and interocclusal relationships needed for proper surgical planning and production of surgical splints. To get a proper representation of the dentition, integration of a digital dental model into the CBCT scan is necessary. The aim of this study was to validate a simplified protocol to integrate digital dental models into CBCT scans using only one scan. MATERIALS AND METHODS: Conventional protocol A used one combined upper and lower impression and two CBCT scans...
September 20, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28921164/age-estimation-based-on-willems-method-versus-new-country-specific-method-in-south-african-black-children
#7
Guy Willems, Sang-Seob Lee, Andre Uys, Herman Bernitz, Maria Cadenas de Llano-Pérula, Steffen Fieuws, Patrick Thevissen
AIM: The aims of our study were to develop new maturity scores for dental age estimation in South African black children according to the Willems method, which was developed based on Belgian Caucasian (BC) reference data (Willems et al. J Forensic Sci 46(4):893-895, 2001), and to compare age prediction performance of both methods. SUBJECTS AND METHODS: A total of 986 panoramic radiographs of healthy South African black (SAB) children (493 males and 493 females) in the age range of 4...
September 18, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28880116/photoacoustic-imaging-for-noninvasive-periodontal-probing-depth-measurements
#8
C Y Lin, F Chen, A Hariri, C J Chen, P Wilder-Smith, T Takesh, J V Jokerst
The periodontal probe is the gold standard tool for periodontal examinations, including probing depth measurements, but is limited by systematic and random errors. Here, we used photoacoustic ultrasound for high-spatial resolution imaging of probing depths. Specific contrast from dental pockets was achieved with food-grade cuttlefish ink as a contrast medium. Here, 39 porcine teeth (12 teeth with artificially deeper pockets) were treated with the contrast agent, and the probing depths were measured with novel photoacoustic imaging and a Williams periodontal probe...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28863923/accuracy-of-3-dimensional-curvilinear-measurements-on-digital-models-with-intraoral-scanners
#9
Spencer Mack, Tammy Bonilla, Jeryl D English, Benjamin Cozad, Sercan Akyalcin
INTRODUCTION: Our objectives were to evaluate and compare the digital dental models generated from 2 commercial intraoral scanners with manual measurements when performing 3-dimensional surface measurements along a curved line (curvilinear). METHODS: Dry mandibles (n = 61) with intact dentition were used. The mandibles were digitized using 2 chair-side intraoral scanners: Cadent iTero (Align Technology, San Jose, Calif) and Lythos Digital Impression system (Ormco, Orange, Calif)...
September 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28862763/technical-quality-of-root-canal-treatment-performed-by-undergraduate-students-using-hand-instrumentation-a-meta-analysis
#10
REVIEW
D M Ribeiro, J C Réus, W T Felippe, C Pachêco-Pereira, K L Dutra, J N Santos, A L Porporatti, G De Luca Canto
The technical quality of root canal treatment (RCT) may impact on the outcome. The quality of education received during undergraduate school may be linked to the quality of treatment provided in general dental practice. In this context, the aim of this systematic-review is to answer the following focused questions: 1) What is the frequency of acceptable technical quality of root fillings, assessed radiographically, performed by undergraduate students? 2) What are the most common errors assessed radiographically and reported in these treatments? For this purpose, articles that evaluated the quality of root fillings performed by undergraduate students were selected...
September 1, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28840895/the-evaluation-of-a-continuing-professional-development-package-for-primary-care-dentists-designed-to-reduce-stress-build-resilience-and-improve-clinical-decision-making
#11
H R Chapman, S Y Chipchase, R Bretherton
Introduction Stress and burnout are widely accepted as a problem for primary care dental practitioners. Previous programmes to address this issue have met with some success. Burnout is associated with poor coping skills and emotion regulation, and increased rates of clinical errors. Anxiety is associated with poor decision-making and is thought to be associated with poor clinical decision-making. Attempts to improve decision-making use increasing meta-awareness and review of thinking processes. Bibliotherapy is an effective method of delivering cognitive behavioural therapy as self-help or guided self-help (with some therapist input) formats...
August 25, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28818647/malocclusion-class-ii-division-1-skeletal-and-dental-relationships-measured-by-cone-beam-computed-tomography
#12
Yiling Xu, Heesoo Oh, Manuel O Lagravère
OBJECTIVES: The purpose of this study was to locate traditionally-used landmarks in two-dimensional (2D) images and newly-suggested ones in three-dimensional (3D) images (cone-beam computer tomographies [CBCTs]) and determine possible relationships between them to categorize patients with Class II-1 malocclusion. METHODS: CBCTs from 30 patients diagnosed with Class II-1 malocclusion were obtained from the University of Alberta Graduate Orthodontic Program database...
August 14, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28817741/reconstruction-of-a-severely-atrophied-alveolar-ridge-by-computer-aided-gingival-simulation-and-3d-printed-surgical-guide-a-case-report
#13
In-Seok Song, Mi-Ran Lee, Jae-Jun Ryu, Ui-Lyong Lee
Dental implants positioned in severely atrophied anterior maxillae require esthetic or functional compromises. This case report describes the rehabilitation of a severely atrophied alveolar ridge with a three-dimensional (3D) computer-aided design/computer-aided manufacture (CAD/CAM) surgical guide. A 50-year-old woman had a severely atrophied anterior maxilla with unfavorably positioned dental implants. Functional and esthetic prosthodontic restoration was difficult to achieve. An anterior segmental osteotomy was planned to reposition the dental implants...
August 17, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28803737/cone-beam-computed-tomography-based-cephalometric-norms-for-brazilian-adults
#14
R M G Santos, J M De Martino, F Haiter Neto, L A Passeri
This study established cone beam computed tomography (CBCT)-based cephalometric norms for Brazilian adults, including the assessment of sexual dimorphism. An observer performed McNamara's cephalometric analysis twice on 60 CBCT datasets acquired from patients with a normal dental occlusion, divided equally into two groups by sex. Welch's t-test was applied to assess differences between the sexes in hard tissue cephalometric measurements, and Dahlberg's formula was used to calculate measurement error introduced by the observer...
August 10, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28791961/simultaneous-calibration-phantom-commission-and-geometry-calibration-in-cone-beam-ct
#15
Yuan Xu, Shuai Yang, Jianhui Ma, Bin Li, Shuyu Wu, Hongliang Qi, Linghong Zhou
Geometry calibration is a vital step for describing the geometry of a cone beam computed tomography (CBCT) system and is a prerequisite for CBCT reconstruction. In current methods, calibration phantom commission and geometry calibration are divided into two independent tasks. Small errors in ball-bearing (BB) positioning in the phantom-making step will severely degrade the quality of phantom calibration. To solve this problem, we propose an integrated method to simultaneously realize geometry phantom commission and geometry calibration...
August 9, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28756305/age-assessment-in-canine-and-premolar-by-cervical-axial-sections-of-cone-beam-computed-tomography
#16
Hichem Nemsi, Nidhal Haj Salem, Ines Bouanene, Sami Ben Jomaa, Meriem Belhadj, Mohamed Amin Mosrati, Abir Aissaoui, Faten Ben Amor, Ali Chadly
Age estimation in adults is a challenge in both anthropological and forensic situations compared to sub-adults age estimation. The present study explored, for the first time, the cervical zone of single rooted teeth. The deposition of secondary dentin is responsible for a decrease in the volume of the dental pulp cavity with aging, and therefore is often used as an age indicator. The current study aimed at estimating the chronological age among adults by measuring the pulp/dentin area ratio (physiological ratio) by axial sections at cervical region of maxillary canine and mandibular second premolar...
September 2017: Legal Medicine
https://www.readbyqxmd.com/read/28748194/recurrent-metatarsal-fractures-in-postmenopausal-woman-with-low-serum-alkaline-phosphatase-a-rare-diagnosis-not-to-miss
#17
Umair Iqbal, Hafsa Anwar, Ahmad Chaudhary, Madiha Alvi, Amy Freeth
Hypophosphatasia (HPP) is a rare inborn error of metabolism due to a loss-of-function mutation in the gene for tissue nonspecific isoenzyme of alkaline phosphatase (ALP) that results in low levels of ALP. The clinical presentation of HPP is variable and in adults can easily be misdiagnosed as other forms of osteomalacia. We present a case of a 53-year-old Caucasian female who was evaluated for recurrent metatarsal fractures. She reported her first metatarsal fracture at age 21, and since then had at least 8 more metatarsal fractures over her lifetime, most without injury other than weight bearing...
July 2017: Journal of Investigative Medicine High Impact Case Reports
https://www.readbyqxmd.com/read/28741257/the-comorbidity-burden-of-patients-with-cluster-headache-a-population-based-study
#18
Shivang Joshi, Paul Rizzoli, Elizabeth Loder
BACKGROUND: Evidence is limited regarding the comorbidity burden of patients with cluster headache (CH). We aimed to characterize comorbid conditions in a cohort of CH patients diagnosed by headache experts, using electronic health record information from the Partners Research Patient Data Registry (RPDR). METHODS: We identified and reviewed the charts of unique patients diagnosed by headache specialists over an 11-year period, and a set of matched controls. Patients were categorized as having Definite, Unconfirmed or no CH...
December 2017: Journal of Headache and Pain
https://www.readbyqxmd.com/read/28738248/the-reliability-and-validity-of-measurements-of-human-dental-casts-made-by-an-intra-oral-3d-scanner-with-conventional-hand-held-digital-callipers-as-the-comparison-measure
#19
Mithun Rajshekar, Roberta Julian, Anne-Marie Williams, Marc Tennant, Alex Forrest, Laurence J Walsh, Gary Wilson, Leigh Blizzard
AIM: Intra-oral 3D scanning of dentitions has the potential to provide a fast, accurate and non-invasive method of recording dental information. The aim of this study was to assess the reliability of measurements of human dental casts made using a portable intra-oral 3D scanner appropriate for field use. METHOD: Two examiners each measured 84 tooth and 26 arch features of 50 sets of upper and lower human dental casts using digital hand-held callipers, and secondly using the measuring tool provided with the Zfx IntraScan intraoral 3D scanner applied to the virtual dental casts...
September 2017: Forensic Science International
https://www.readbyqxmd.com/read/28708981/a-comparison-of-the-validity-of-the-demirjian-willems-nolla-and-h%C3%A3-%C3%A3-vikko-methods-in-determination-of-chronological-age-of-5-15-year-old-indian-children
#20
COMPARATIVE STUDY
Sapna Hegde, Akash Patodia, Uma Dixit
BACKGROUND: Demirjian's method has been the most popular and extensively tested radiographic method of age estimation. More recently, Willems' method has been reported to be a better predictor of age. Nolla's and Häävikko's methods have been used to a lesser extent. Very few studies have compared all four methods in non-Indian and Indian populations. Most Indian research is limited by inadequate sample sizes, age structures and grouping and different approaches to statistical analysis...
August 2017: Journal of Forensic and Legal Medicine
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