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https://www.readbyqxmd.com/read/28318544/stereolithography-a-new-method-for-processing-dental-ceramics-by-additive-computer-aided-manufacturing
#1
Marion Dehurtevent, Lieven Robberecht, Jean-Christophe Hornez, Anthony Thuault, Etienne Deveaux, Pascal Béhin
OBJECTIVES: The aim of this study was to compare the physical and mechanical properties of stereolithography (SLA)- manufactured alumina ceramics of different composition to those of subtractive- manufactured ceramics and to produce suitable dental crown frameworks. METHODS: The physical and mechanical properties of a control and six experimental SLA ceramics prepared from slurries with small (S) and large (L) particles (0.46±0.03 and 1.56±0.04μm, respectively) and three dry matter contents (70%, 75%, 80%) were evaluated by dynamic rheometry, hydrostatic weighing, three3-point flexural strength measurements, and Weibull analyses, and by the micrometrics measurement of shrinkage ratio before and after the heat treatments...
March 16, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28317827/-direct-restoration-of-the-tooth-crown-using-various-core-build-up-materials
#2
L N Maksimovskaya, V A Krutov, P V Kuprin, M A Kuprina
The aim of the study was to assess direct restorations mechanical properties (both in vitro and in vivo) to improve dental restorations quality after root canal treatment. Laboratory tests showed that using nanocomposite materials of dual curing with the fiberglass reinforced posts improves restoration strength in endodontically treated teeth: by 3.9±5.8% in class II Peroz restorations, 12.6±5.9 and 24.2±4.2% in class III and IV, correspondently. Using fiberglass reinforced posts (LuxaPost) for the restoration of the tooth crown after endodontic treatment significantly decreases the number of complications associated with marginal leakage of the restoration during first 2 years after treatment (p<005)...
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28316916/human-ex-vivo-dentin-pulp-complex-preservation-in-a-full-crown-model
#3
João Botelho, Maria Alzira Cavacas, Gonçalo Borrecho, Mário Polido, Pedro Oliveira, José Martins Dos Santos
OBJECTIVES: Currently, there is lack of human in vitro full tooth models that hold the odontoblast layer with pulp tissue in their native environment. The appearance of new in vitro and in vivo models has provided new understanding of the potential of tissue engineering in dental pulp regeneration. However, the development of new in vitro full tooth models will allow us to get closer to in vivo conditions. Thus, the aim of this study is to preserve a living dentin-pulp complex, in a novel in vitro full crown model, after tooth extraction...
January 2017: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/28302948/the-accuracy-of-the-cad-system-using-intraoral-and-extraoral-scanners-for-designing-of-fixed-dental-prostheses
#4
Sakura Shimizu, Akikazu Shinya, Soichi Kuroda, Harunori Gomi
The accuracy of prostheses affects clinical success and is, in turn, affected by the accuracy of the scanner and CAD programs. Thus, their accuracy is important. The first aim of this study was to evaluate the accuracy of an intraoral scanner with active triangulation (Cerec Omnicam), an intraoral scanner with a confocal laser (3Shape Trios), and an extraoral scanner with active triangulation (D810). The second aim of this study was to compare the accuracy of the digital crowns designed with two different scanner/CAD combinations...
March 8, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28301683/how-to-treat-two-adjacent-missing-teeth-with-dental-implants-a-systematic-review-on-single-implant-supported-two-unit-cantilever-fdp-s-and-results-of-a-5-year-prospective-comparative-study-in-the-aesthetic-zone
#5
Wouter G Van Nimwegen, Gerry M Raghoebar, Nynke Tymstra, Arjan Vissink, Henny J A Meijer
AIM: To conduct a systematic review on the clinical outcome of single implant-supported two-unit cantilever FDP's and to conduct a 5-year prospective comparative pilot study of patients with a missing central and lateral upper incisor treated with either a single implant-supported two-unit cantilever FDP or two implants with solitary implant crowns in the aesthetic zone. MATERIAL AND METHODS: Medline, Embase and the Cochrane Central Register of Controlled Trials were searched (last search August 1, 2016) for eligible studies...
March 16, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28295540/v-atpases-containing-a3-subunit-play-a-direct-role-in-enamel-development-in-mice
#6
Lisa Johnson, Bernhard Ganss, Andrew Wang, Ralph A Zirngibl, Danielle E Johnson, Celeste Owen, Grace Bradley, Irina Voronov
Vacuolar H(+) -ATPases (V-ATPases) are ubiquitous multisubunit proton pumps responsible for organellar pH maintenance. Mutations in the a3 subunit of V-ATPases cause autosomal recessive osteopetrosis; a rare disease due to impaired bone resorption. Patients with osteopetrosis also display dental anomalies, such as enamel defects; however, it is not clear whether these enamel abnormalities are a direct consequence of the a3 mutations. We investigated enamel mineralization, spatiotemporal expression of enamel matrix proteins and the a3 protein during tooth development using an osteopetrotic mouse model with a R740S point mutation in the V-ATPase a3 subunit...
March 11, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28291847/biomechanical-behavior-of-the-dental-implant-macrodesign
#7
Camila Lima de Andrade, Marco Aurélio Carvalho, Dimorvan Bordin, Wander José da Silva, Altair Antoninha Del Bel Cury, Bruno Salles Sotto-Maior
PURPOSE: The aim of this study was to evaluate the influence of implant macrodesign when using different types of collar and thread designs on stress/strain distributions in a maxillary bone site. MATERIALS AND METHODS: Six groups were obtained from the combination of two collar designs (smooth and microthread) and three thread shapes (square, trapezoidal, and triangular) in external hexagon implants (4 × 10 mm) supporting a single zirconia crown in the maxillary first molar region...
March 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28288299/comparison-between-positive-dental-images-and-neutral-images-in-managing-anticipatory-anxiety-of-children
#8
Dalia O Kamel, Nadia A Wahba, Dalia M Talaat
OBJECTIVE: To evaluate the impact of positive images versus neutral images on child behavior during dental treatment and their dental anxiety after dental treatment. STUDY DESIGN: Sixty, 4 to 6 year old healthy pediatric dental patients, indicated for pulpotomy and stainless steel crown restorations, were divided randomly into two equal groups. Group I (experimental group viewed positive dental images and group II (control group) viewed neutral cartoon images prior to treatment...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28281610/the-standard-of-newly-qualified-dental-graduates-foundation-trainer-perceptions
#9
C J Oxley, R Dennick, P Batchelor
Background There have been anecdotal concerns that the skill mix of recently qualified graduates is very different to those qualifying several years ago, in particular that the clinical skills on qualification are less. If true, such changes may have ramifications for providers of undergraduate training, postgraduate training, particularly at foundation training level, and ultimately the public.Aim The aim of this study was to assess changes in perceived standards of newly qualified graduates as reported by foundation trainers...
March 10, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28276628/traumatic-dental-injuries-in-children-with-special-health-care-needs
#10
Ola B Al-Batayneh, Arwa I Owais, Majd O Al-Saydali, H Barry Waldman
BACKGROUND/AIM: Children with special health care needs (CSHCN) are at an increased risk for traumatic dental injuries (TDI) due to unique predisposing factors; moreover, their access to dental care is compromised. In Jordan, there is a need to study TDI among CSHCN to highlight their dental care needs. The aim of this study was to identify the prevalence, types, possible risk factors associated with TDI, and treatment-seeking behavior in CSHCN in Jordan. MATERIAL AND METHODS: Children (n=959) were examined in schools/centers for CSHCN, and compared to a healthy age- and gender-matched control group...
March 9, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
https://www.readbyqxmd.com/read/28267830/build-angle-does-it-influence-the-accuracy-of-3d-printed-dental-restorations-using-digital-light-processing-technology
#11
Reham B Osman, Nawal Alharbi, Daniel Wismeijer
PURPOSE: The aim of this study was to evaluate the effect of the build orientation/build angle on the dimensional accuracy of full-coverage dental restorations manufactured using digital light-processing technology (DLP-AM). MATERIALS AND METHODS: A full dental crown was digitally designed and 3D-printed using DLP-AM. Nine build angles were used: 90, 120, 135, 150, 180, 210, 225, 240, and 270 degrees. The specimens were digitally scanned using a high-resolution optical surface scanner (IScan D104i, Imetric)...
March 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28267827/efficacy-of-a-checklist-for-office-laboratory-communication-a-clinical-study-on-quality-outcomes-for-single-crowns
#12
Mario E Bresciano, Andrea De Maria, Marco Morello, Enrico Poglio, Guido Audenino
PURPOSE: The aim of this study was to evaluate the efficacy of a structured communication protocol between dentists and dental laboratory technicians. MATERIALS AND METHODS: A total of 112 single metal-ceramic crowns, fabricated by four different dentist-dental technician pairs, were evaluated at the clinical try-in appointment. Subsequently, each professional pair produced another 112 crowns using a checklist. RESULTS: The scores showed a statistically significant improvement in clinical outcomes with the use of a checklist by reducing adjustment times for contact area, fit, and occlusion and number of appointments...
March 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28267819/cemented-single-crown-retention-on-dental-implants-an-in-vitro-study
#13
Stefan Rues, Melissa Fugina, Peter Rammelsberg, Stefanie Kappel
PURPOSE: The aim of this study was to determine the influence of selected cements, abutment heights, and aging on the retention of zirconia crowns on zirconia abutments. MATERIALS AND METHODS: Zirconia crowns and abutments (height: 4.0 or 5.5 mm) were sandblasted and retained using five different cements. Axial pull-off tests were performed after thermocycling or 3 days of water storage. RESULTS: An increase in abutment height was associated with an increase in decementation force when permanent cementation was tested...
March 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28258271/patterns-of-restorative-failure-among-khat-and-shammah-users-in-jazan-city-kingdom-of-saudi-arabia-a-cross-sectional-survey
#14
Mohammed E Sayed, Razan A Bosly, Huda A Hakami, Maryam H Mugri, Shilpa H Bhandi
INTRODUCTION: The effect of Khat and Shammah habits, with the parafunctional jaw activities that accompany them, on the integrity of the natural dentition, dental restorations, and prostheses has not yet been investigated. This study is the first attempt to identify the patterns of restorative failure among Khat chewers and Shammah users in Jazan City, Kingdom of Saudi Arabia. MATERIALS AND METHODS: A cross-sectional study was conducted in 294 recruits among dental clinics in Jazan City, Kingdom of Saudi Arabia, from October 1, 2015, to April 30, 2016...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28257608/research-and-primary-evaluation-of-an-automatic-fusion-method-for-multi-source-tooth-crown-data
#15
Ning Dai, Dawei Li, Xu Yang, Cheng Cheng, Yuchun Sun
BACKGROUND: With the development of 3D scanning technologies in dentistry, high accuracy optical scanning data from the crown and cone beam computed tomography (CBCT) data from the root can be acquired easily. In many dental fields, especially in digital orthodontics, it is useful to fuse the data from the crown and the root. However, the manual fusion method is complex and difficult. A novel automatic fusion method for two-source data from the crown and the root was researched and its accuracy was evaluated in this study...
March 3, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28253188/clinical-assessment-of-the-gingival-contours-and-proximal-contact-areas-in-the-maxillary-anterior-dentition
#16
Ranganath Venugopal, Arshia Zainab A Jameel Ahmed, Ashish S Nichani
Gingival display has been identified as a critical element in a beautiful smile and thus in facial esthetics. The present study aimed to assess the gingival line angle (GLA); the distance between the gingival zenith of maxillary lateral incisor and the gingival line (LID); and the ratio between the height of the proximal contact area (PCA) and crown length, referred to as the proximal contact area proportion (PCAP). Fifty patients, aged 21-30 years, were recruited for study. Maxillary impressions were made using irreversible hydrocolloid and poured in dental stone, and facebow records were used to mount the master casts in an articulator...
March 2017: General Dentistry
https://www.readbyqxmd.com/read/28252424/the-peculiarities-of-treatment-of-uncomplicated-and-complicated-dental-injuries-caused-by-trauma
#17
M Mamaladze, N Nizharadze, O Vadachkoria
Trauma related injuries of permanent teeth occur frequently and are the most pressing issue the dentists are facing today. In different age groups the same type of trauma affects the teeth with different frequencies. For instance, accident related dental trauma in children and adults affected permanent teeth in 30% and deciduous teeth in 20%, respectively. It should also be noted that front teeth are more susceptible to traumatic injuries compared to the incisors. Upper front teeth were injured in 72% of cases, while lower central, upper lateral incisors, canines and premolars only in 6-8%...
January 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28251607/a-radiographic-study-of-permanent-molar-development-in-wild-virunga-mountain-gorillas-of-known-chronological-age-from-rwanda
#18
Alexandra E Kralick, M Loring Burgess, Halszka Glowacka, Keely Arbenz-Smith, Kate McGrath, Christopher B Ruff, King Chong Chan, Michael R Cranfield, Tara S Stoinski, Timothy G Bromage, Antoine Mudakikwa, Shannon C McFarlin
OBJECTIVES: While dental development is important to life history investigations, data from wild known-aged great apes are scarce. We report on the first radiographic examination of dental development in wild Virunga mountain gorillas, using known-age skeletal samples recovered in Rwanda. MATERIALS AND METHODS: In 43 individuals (0.0-14.94 years), we collected radiographs of mandibular molars, and where possible, cone beam CT scans. Molar crown and root calcification status was assessed using two established staging systems, and age prediction equations generated using polynomial regression...
March 2, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28251593/frontonasal-dysplasia-oral-features-restorative-and-orthodontic-dental-treatment-in-a-child
#19
R A Valério, C Scatena, F R R Santos, F L Romano, A M Queiroz, F W G Paula-Silva
BACKGROUND: Frontonasal dysplasia is a complex rare malformation, characterised by abnormalities involving the central portion of the face, especially the eyes, nose and forehead. It can manifest independently or associated with other abnormalities as part of some syndromes. CASE REPORT: The purpose of this case report was to describe a 5-year-old patient, diagnosed with frontonasal dysplasia. Among the abnormalities characterised with this disorder were ocular hypertelorism, broad nose tip with median notch, median facial cleft, bifid anterior skull, low set hairline, Poland's syndactyly and ankyloglossia...
March 1, 2017: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28250040/safety-assessment-of-two-hybrid-instrumentation-techniques-in-a-dental-student-endodontic-clinic-a-retrospective-study
#20
Marcelo Santos Coelho, Steven John Card, Peter Zahi Tawil
The aim of this study was to retrospectively assess the safety potential of a hybrid technique combining nickel-titanium (NiTi) reciprocating and rotary instruments by third- and fourth-year dental students in the predoctoral endodontics clinic at one U.S. dental school. For the study, 3,194 root canal treatments performed by 317 dental students from 2012 through 2015 were evaluated for incidence of ledge creation and instrument separation. The hybrid reciprocating and rotary technique (RRT) consisted of a glide path creation with stainless steel hand files up to size 15/02, a crown down preparation with a NiTi reciprocating instrument, and an apical preparation with NiTi rotary instruments...
March 2017: Journal of Dental Education
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