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https://www.readbyqxmd.com/read/28936037/comparison-of-resistance-to-fracture-between-three-types-of-permanent-restorations-subjected-to-shear-force-an-in-vitro-study
#1
Ramin Atash, Maiyas Arab, Hadrien Duterme, Sibel Cetik
INTRODUCTION: Our study's objective was to compare resistance to fracture between endocrown and conventional post and core restorations when subjected to shear force. MATERIALS AND METHODS: Thirty human mandibular premolars were extracted for orthodontic reasons, endodontically treated, and restored using three different methods: endocrown, glass fiber post and composite resin core, and metal post. All the crowns were made from IPS e.max ceramic. Shear forces were applied to these restorations using a test machine until breakage...
July 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28936034/systematic-analysis-on-the-efficacy-of-bone-enhancement-methods-used-for-success-in-dental-implants
#2
REVIEW
S Elakkiya, A S Ramesh, K Prabhu
Bone grafting is beneficial in enhancing bones that are lost due to trauma or natural or pathologic process. Autogenous bone, allogenic bone, xenogeneic bone, bone substitutes, and alloplasts can also be used for this purpose. Bone quantity should be adequate for the placement of implants, which necessitate the use of bone grafts before implant placement. OBJECTIVE: This review analyses the different bone graft materials that are used for grafting around implants and evaluate if these grafts yield successful implant osseointegration over a period of time...
July 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28935100/a-critical-review-on-the-prospect-of-polyaniline-grafted-biodegradable-nanocomposite
#3
REVIEW
Mohammad Shahadat, Mohammad Zain Khan, Parveen Fatemeh Rupani, Asha Embrandiri, Saima Sultana, Shaikh Ziauddin Ahammad, S Wazed Ali, T R Sreekrishnan
Among the various electrically conducting polymers, polyaniline (PANI) has gained attentions due to its unique properties and doping chemistry. A number of electrically conducting biodegradable polymers has been synthesized by incorporating a biodegradable content of cellulose, chitin, chitosan, etc. in the matrix of PANI. The hybrid materials are also employed as photocatalysts, antibacterial agents, sensors, fuel cells and as materials in biomedical applications. Furthermore, these biodegradable and biocompatible conducting polymers are employed in tissue engineering, dental implants and targeted drug delivery...
September 6, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28932309/the-effect-of-three-different-biomaterials-on-proliferation-and-viability-of-human-dental-pulp-stem-cells-in-vitro-study
#4
Dalia A Mohamed, Maha I Abdelfattah, Eman H A Aboulezz
BACKGROUND: Biomaterial cytotoxicity on dental stem cells plays a critical role in managing the regeneration of dental tissue. AIM: The aim of the present study was to evaluate the effect of Nano-hydroxy apatite (NHA), Mineral trioxide aggregate (MTA), and Calcium-enriched mixture (CEM) on the proliferation, and viability of human dental pulp stem cells (hDPSCs) isolated from third molar teeth. METHODS: Cultured DPSCs were characterized and the tested biomaterials were shaped into cylinders then inserted directly on the DPSCs...
August 15, 2017: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28932142/color-stability-and-marginal-integrity-of-interim-crowns-an-in-vitro-study
#5
Marwa I Elagra, Mohammad R Rayyan, Maisam M Alhomaidhi, Areej A Alanaziy, Mona O Alnefaie
OBJECTIVE: Many commercial dental materials are used to fabricate interim restorations. This study aimed to compare the color stability and the marginal integrity of four different interim crown materials. MATERIALS AND METHODS: An ivorine right maxillary central incisor was prepared for a full coverage all-ceramic restoration. A total of 36 specimens in the form of crowns were fabricated on the master die using four different materials (n = 9); Polymethyl methacrylate (PMMA) resin (TrimPLUS), PMMA computer-aided design, and computer-aided manufacturing (CAD-CAM) blocks (Ceramill TEMP), cold cure bis-acryl resin (Success CD), and bis-acryl resin dual-cure composite (TempSpan)...
July 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28929419/high-resolution-mr-imaging-for-dental-impressions-a-feasibility-study
#6
Julian Boldt, Kurt Rottner, Marc Schmitter, Andreas Hopfgartner, Peter Jakob, Ernst-Jürgen Richter, Olga Tymofiyeva
OBJECTIVES: Magnetic resonance imaging is an emerging technology in dental medicine. While low-resolution MRI has especially provided means to examine the temporomandibular joint due to its anatomic inaccessibility, it was the goal of this study to assess whether high-resolution MRI is capable of delivering a dataset sufficiently precise enough to serve as digital impression of human teeth. MATERIALS AND METHODS: An informed and consenting patient in need of dental restoration with fixed partial dentures was chosen as subject...
September 19, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28928776/analytical-methods-for-the-measurement-of-polymerization-kinetics-and-stresses-of-dental-resin-based-composites-a-review
#7
REVIEW
Mehrsima Ghavami-Lahiji, Tabassom Hooshmand
Resin-based composites are commonly used restorative materials in dentistry. Such tooth-colored restorations can adhere to the dental tissues. One drawback is that the polymerization shrinkage and induced stresses during the curing procedure is an inherent property of resin composite materials that might impair their performance. This review focuses on the significant developments of laboratory tools in the measurement of polymerization shrinkage and stresses of dental resin-based materials during polymerization...
July 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28927925/optical-properties-of-zirconia-ceramics-for-esthetic-dental-restorations-a-systematic-review
#8
REVIEW
Reza Shahmiri, Owen Christopher Standard, Judy N Hart, Charles Christopher Sorrell
STATEMENT OF PROBLEM: Yttria-stabilized tetragonal zirconia polycrystal has been used as a dental biomaterial for several decades because the fracture toughness and bend strength are increased by a stress-induced transformation-toughening mechanism. However, its esthetics are compromised by its poor translucency and grayish-white appearance. PURPOSE: The purpose of the present systematic review was to assess information on the mechanical, chemical, and optical requirements of monolithic zirconia dental restorations...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28926638/the-earliest-ossicone-and-post-cranial-record-of-giraffa
#9
Melinda Danowitz, John C Barry, Nikos Solounias
The oldest Giraffa material presently known consists of dental specimens. The oldest post-cranial Giraffa material belongs to the Plio-Pleistocene taxon Giraffa sivalensis, where the holotype is a third cervical vertebra. We describe three non-dental specimens from the Early Late Miocene of the Potwar Plateau, including an 8.1 million year old ossicone, 9.4 million year old astragalus, and 8.9 million year old metatarsal and refer them to Giraffa. The described ossicone exhibits remarkable similarities with the ossicones of a juvenile modern giraffe, including the distribution of secondary bone growth, posterior curvature, and concave pitted undersurface where the ossicone would attach to the skull...
2017: PloS One
https://www.readbyqxmd.com/read/28922616/novel-testing-for-corrosion-of-glass-ceramics-for-dental-applications
#10
J F Esquivel-Upshaw, F Ren, S M Hsu, F Y Dieng, D Neal, A E Clark
The effects of pH cycling immersion on the corrosion of glass-based ceramic materials were investigated by examining the silicon release level in the immersion solution and the surface morphology of the ceramic after immersion. The hypothesis that pH cycling causes more surface degradation than constant immersion was tested. An inductively coupled plasma atomic emission spectrometer was used for Si ion concentration determination and scanning electron microscopy for surface morphology analyses. Two pH cycling sequences (pH 2, 7, 10 and pH 10, 2, 7) were employed in this study...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28921710/non-stick-properties-of-thin-film-coatings-on-dental-restorative-instruments
#11
Jarmo Leppäniemi, Sasha Hoshian, Kimmo Suomalainen, Toni Luoto, Ville Jokinen, Jari Koskinen
The non-stick properties of thin-film coatings on dental-restorative instruments were investigated by static contact-angle measurement using dental filler resin as well as by scanning electron microscopy of the amount of sticking dental restorative material. Furthermore, using a customized dipping measurement set-up, non-stick properties were evaluated by measuring force-by-time when the instrument was pulled out of restorative material. Minor improvements in non-stick properties were obtained with commercial diamond-like carbon and commercial polytetrafluoroethylene-based coatings...
September 18, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28917571/academy-of-dental-materials-guidance-resin-composites-part-ii-technique-sensitivity-handling-polymerization-dimensional-changes
#12
J L Ferracane, T J Hilton, J W Stansbury, D C Watts, N Silikas, N Ilie, S Heintze, M Cadenaro, R Hickel
OBJECTIVE: The objective of this work, commissioned by the Academy of Dental Materials, was to review and critically appraise test methods to characterize properties related to critical issues for dental resin composites, including technique sensitivity and handling, polymerization, and dimensional stability, in order to provide specific guidance to investigators planning studies of these properties. METHODS: The properties that relate to each of the main clinical issues identified were ranked in terms of their priority for testing, and the specific test methods within each property were ranked...
September 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28917087/evaluation-of-four-different-restorative-materials-for-restoration-of-the-periodontal-condition-of-wedge-shaped-defect-a-comparative-study
#13
Jian-Yong Ruan, Zheng-Lin Gong, Rui-Zhi Zhang, Zhe Zhang, Ran Xu, Da-Xu Li, Le Ren, Hong Tao
BACKGROUND This study aimed to conduct a clinical evaluation of four restorative materials for restoration of dental wedge-shaped defect (WSD) and their impacts on periodontal tissues. MATERIAL AND METHODS A total of 280 maxillary premolars with dental WSD were selected from 106 patients; the patient cases were divided into eight groups according to different combinations of restorative materials (flowable resin composites, Dyract compomers, glass ionomer cement (GIC), light-curing composite resin), and WSD positions (approaching gingival and subgingival positions)...
September 16, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28916163/effects-of-small-grit-grinding-and-glazing-on-mechanical-behaviors-and-ageing-resistance-of-a-super-translucent-dental-zirconia
#14
Xuan Lai, Wenjie Si, Danyu Jiang, Ting Sun, Longquan Shao, Bin Deng
OBJECTIVES: The purpose of this study is to elucidate the effects of small-grit grinding on the mechanical behaviors and ageing resistance of a super-translucent dental zirconia and to investigate the necessity of glazing for the small-grit ground zirconia. METHODS: Small-grit grinding was performed using two kinds of silicon carbide abrasive papers. The control group received no grinding. The unground surfaces and the ground surfaces were glazed by an experienced dental technician...
September 12, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28906500/fracture-of-reduced-diameter-zirconia-dental-implants-following-repeated-insertion
#15
Matthias Karl, Stefan Scherg, Tanja Grobecker-Karl
PURPOSE: Achievement of high insertion torque values indicating good primary stability is a goal during dental implant placement. The objective of this study was to evaluate whether or not two-piece implants made from zirconia ceramic may be damaged as a result of torque application. MATERIALS AND METHODS: A total of 10 two-piece zirconia implants were repeatedly inserted into polyurethane foam material with increasing density and decreasing osteotomy size. The insertion torque applied was measured, and implants were checked for fractures by applying the fluorescent penetrant method...
September 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28904949/bioengineering-materials-in-dental-application
#16
EDITORIAL
Wei-Jen Chang, Abe Shinichi, Shinji Kamakura, Ren-Yeong Huang, Jung-Wei Chen
No abstract text is available yet for this article.
2017: BioMed Research International
https://www.readbyqxmd.com/read/28902242/polymerization-shrinkage-stress-of-composite-resins-and-resin-cements-what-do-we-need-to-know
#17
Carlos José Soares, André Luis Faria-E-Silva, Monise de Paula Rodrigues, Andomar Bruno Fernandes Vilela, Carmem Silvia Pfeifer, Daranee Tantbirojn, Antheunis Versluis
Polymerization shrinkage stress of resin-based materials have been related to several unwanted clinical consequences, such as enamel crack propagation, cusp deflection, marginal and internal gaps, and decreased bond strength. Despite the absence of strong evidence relating polymerization shrinkage to secondary caries or fracture of posterior teeth, shrinkage stress has been associated with post-operative sensitivity and marginal stain. The latter is often erroneously used as a criterion for replacement of composite restorations...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28902241/light-curing-in-dentistry-and-clinical-implications-a-literature-review
#18
Frederick Allen Rueggeberg, Marcelo Giannini, Cesar Augusto Galvão Arrais, Richard Bengt Thomas Price
Contemporary dentistry literally cannot be performed without use of resin-based restorative materials. With the success of bonding resin materials to tooth structures, an even wider scope of clinical applications has arisen for these lines of products. Understanding of the basic events occurring in any dental polymerization mechanism, regardless of the mode of activating the process, will allow clinicians to both better appreciate the tremendous improvements that have been made over the years, and will also provide valuable information on differences among strategies manufacturers use to optimize product performance, as well as factors under the control of the clinician, whereby they can influence the long-term outcome of their restorative procedures...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28902240/randomized-clinical-trials-of-dental-bleaching-compliance-with-the-consort-statement-a-systematic-review
#19
Alessandro Dourado Loguercio, Bianca Medeiros Maran, Taíse Alessandra Hanzen, Alexandra Mara de Paula, Jorge Perdigão, Alessandra Reis
We reviewed the literature to evaluate: a) The compliance of randomized clinical trials (RCTs) on bleaching with the CONSORT; and b) the risk of bias of these studies using the Cochrane Collaboration risk of bias tool (CCRT). We searched the Cochrane Library, PubMed and other electronic databases, to find RCTs focused on bleaching (or whitening). The articles were evaluated in compliance with CONSORT in a scale: 0 = no description, 1 = poor description and 2 = adequate description. Descriptive analyses of the number of studies by journal, follow-up period, country and quality assessments were performed with CCRT for assessing risk of bias in RCTs...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28902238/dental-ceramics-a-review-of-new-materials-and-processing-methods
#20
Lucas Hian da Silva, Erick de Lima, Ranulfo Benedito de Paula Miranda, Stéphanie Soares Favero, Ulrich Lohbauer, Paulo Francisco Cesar
The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics...
August 28, 2017: Brazilian Oral Research
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