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MINERALIZATION OF TEETH ENAMEL AFTER ERUPTION.

Wiad Lek 2021 ;74(6):1297-1301

POLTAVA STATE MEDICAL UNIVERSITY, POLTAVA, UKRAINE.

Objective: The aim: The paper was aimed at the study of the processes of mineralization of the enamel of the permanent tooth after its eruption.

Patients And Methods: Materials and methods: To study the structure of the enamel of permanent teeth has been carried out using light and electron microscopy. The study of the process of the development of the primordia of the permanent teeth involved 10 culled puppies of 30-40 days of age. Read More

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Adhesion as a component of retention force of overdenture prostheses-study on selected Au based dental materials used for telescopic crowns using atomic force microscopy and contact angle techniques.

J Mech Behav Biomed Mater 2021 Jun 15;121:104648. Epub 2021 Jun 15.

Nanometrology Department, Wroclaw University of Science and Technology, Janiszewskiego 11/17, 50-372, Wroclaw, Poland.

Contemporary prosthetic materials are characterized by highly specific preparation for a given application. This means that at the stage of their creation, not only their function is taken into account, but also the long-term behavior of this material during use. In the case of telescopic crowns, an important factor not yet appearing in the research is the aspect of adhesion force and its dependence on the type of biomaterial, but also the properties of human saliva. Read More

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The Effect of Temperature on Disease Severity and Growth of f. sp. Races 2 and 4 in Celery.

Phytopathology 2021 Jun 21. Epub 2021 Jun 21.

University of California Davis, 8789, Dept. of Plant Pathology, Hutchison Hall, Davis, California, United States, 95616-5270;

f. sp. () race 4, which is in species complex (FOSC) Clade 2, causes a new Fusarium wilt of celery. Read More

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Tooth discoloration induced by apical plugs with hydraulic calcium silicate-based cements in teeth with open apices-a 2-year in vitro study.

Clin Oral Investig 2021 Jun 21. Epub 2021 Jun 21.

Department of Conservative Dentistry and Periodontology and Center of Dental Traumatology, University Hospital of Würzburg, Pleicherwall 2, 97070, Würzburg, Germany.

Objectives: To assess tooth discoloration induced by different hydraulic calcium silicate-based cements (HCSCs), including effects of blood and placement method.

Materials And Methods: Eighty bovine teeth cut to a length of 18 mm (crown 8 mm, root 10 mm) were randomly assigned to 10 groups (n = 8), receiving orthograde apical plug treatment (APT). Apical plugs were 4 mm in length and made of ProRoot MTA (Dentsply), Medcem MTA (Medcem), TotalFill BC RRM Fast Set Putty (Brasseler), or Medcem Medical Portland Cement (Medcem) plus bismuth oxide (Bi2O3) with and without bovine blood. Read More

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A Special Design to Facilitate Retrieval of Cement-Retained Zirconia-Based Implant-Supported Restorations.

J Dent (Shiraz) 2021 Jun;22(2):132-137

Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

Statement Of The Problem: Retrieval of cement-retained implant-supported restorations is challenging in cases of screw loosening or periodontal problems.

Purpose: The purpose of this study was to evaluate the effect of the screw access hole on the fracture resistance of zirconia-based cement-retained restorations with and without an access opening.

Materials And Method: In this study thirty-three cement-retained implant-supported zirconia-based molar crowns were fabricated and divided into 3 groups (n=11). Read More

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Marginal adaptation of CAD-CAM and heat-pressed lithium disilicate crowns: A systematic review and meta-analysis.

J Prosthet Dent 2021 Jun 16. Epub 2021 Jun 16.

Adjunct Professor, Department of Dentistry, Bahiana School of Medicine and Public Health (EBMSP), Salvador, Bahia, Brazil; Associate Professor, Department of Clinical Dentistry, Faculty of Dentistry, Federal University of Bahia (UFBA), Salvador, Bahia, Brazil. Electronic address:

Statement Of Problem: Lithium disilicate crowns can be manufactured by computer-aided design and computer-aided manufacturing (CAD-CAM) or with the heat-pressed technique. The outcome of studies comparing the effect of the manufacturing method on the marginal adaptation of these crowns is not clear.

Purpose: The purpose of this systematic review and meta-analysis was to investigate the effect of the CAD-CAM system and pressing technique on the marginal adaptation of lithium disilicate crowns. Read More

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Accuracy of marginal fit of an implant-supported framework fabricated by 3D printing versus subtractive manufacturing technique: A systematic review and meta-analysis.

J Prosthet Dent 2021 Jun 16. Epub 2021 Jun 16.

Professor, Department of Prosthodontics, People's College of Dental Science and Research Centre, Bhopal, India.

Statement Of Problem: Evidence comparing additive 3-dimensional printing (3DP) with subtractive milling for implant-supported frameworks is lacking.

Purpose: The purpose of this systematic review and meta-analysis was to compare the marginal fit and accuracy of complete-arch implant-supported frameworks (CA), implant-retained fixed partial dentures (IRFPDs), single implant crowns (SICs), and interim implant-retained restorations (IIRRs) by using additive manufacturing (AM) and subtractive manufacturing (SM) methods.

Material And Methods: An electronic search was performed in PubMed, ScienceDirect, Google Scholar, and the Cochrane Library for articles published up to August 2020. Read More

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Fabrication, workflow and delivery of reconstruction: Summary and consensus statements of group 4. The 6th EAO Consensus Conference 2021.

Clin Oral Implants Res 2021 Jun 19. Epub 2021 Jun 19.

Department of Prosthodontics, Medical Faculty, University Hospital Düsseldorf, Düsseldorf, Germany.

Objectives: To report assessments of four systematic reviews (SRs) on (i) clinical outcomes of all-ceramic implant-supported crowns (iSCs), (ii) production time, effectiveness, and costs of computer-assisted manufacturing (CAM), (iii) computer-assisted implant planning and surgery (CAIPS) time and costs, and (iv) patient-reported outcome measures (PROMS).

Material And Methods: An author group consisting of experienced clinicians and content experts discussed and evaluated the SRs and formulated consensus on the main findings, statements, clinical recommendations, and need for future research.

Results: All four SRs were conducted and reported according to PRISMA and detailed comprehensive search strategies in at least three bibliometric databases and hand searching. Read More

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On the phenology of protists: recurrent patterns reveal seasonal variation of protistan (Rhizaria: Cercozoa and Endomyxa) communities in tree canopies.

FEMS Microbiol Ecol 2021 Jun;97(7)

Institute of Zoology, Terrestrial Ecology, University of Cologne, Zülpicher Str. 47b, 50674 Köln, Germany.

Tree canopies are colonized by billions of highly specialized microorganisms that are well adapted to the highly variable microclimatic conditions, caused by diurnal fluctuations and seasonal changes. In this study, we investigated seasonality patterns of protists in the tree canopies of a temperate floodplain forest via high-throughput sequencing with group-specific primers for the phyla Cercozoa and Endomyxa. We observed consistent seasonality, and identified divergent spring and autumn taxa. Read More

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A model of digestive tooth corrosion in lizards: experimental tests and taphonomic implications.

Sci Rep 2021 Jun 18;11(1):12877. Epub 2021 Jun 18.

School of Zoology and The Steinhardt Museum of Natural History, Tel Aviv University, 69978, Tel Aviv, Israel.

Corrosion patterns induced by gastric fluids on the skeleton of prey animals may depend on the nature of the corrosive agents (acid, enzymes) as well as on the composition of the hard parts and the soft tissues that surround them. We propose a framework for predicting and interpreting corrosion patterns on lizard teeth, our model system, drawing on the different digestive pathways of avian and non-avian vertebrate predators. We propose that high-acid, low-enzyme systems (embodied by mammalian carnivores) will lead to corrosion of the tooth crowns, whereas low-acid, high-enzyme systems (embodied by owls) will lead to corrosion of the tooth shafts. Read More

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Alumina particle air-abrasion and aging effects: Fatigue behavior of CAD/CAM resin composite crowns and flexural strength evaluations.

J Mech Behav Biomed Mater 2021 May 19;121:104592. Epub 2021 May 19.

MSciD and PhD Post-Graduate Program in Oral Science, Prosthetic Dentistry Unit, Faculty of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil. Electronic address:

The aim of this study was to characterize the flexural strength and elastic modulus of CAD/CAM resin composite material and to evaluate the influence of different surface treatments and storage conditions on the fatigue behavior of bonded composite crowns. Bars (flexural strength, n= 30; elastic modulus, n= 5) (1.2 × 4 × 12 mm) were produced for three-point bending test and CAD/CAM milled crowns (n= 5) (thickness= 1 mm) adhesively cemented to an epoxy resin substrate for fatigue tests. Read More

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The investigation of the stress distribution in abutment teeth for connected crowns.

J Dent Sci 2021 Jul 26;16(3):929-936. Epub 2020 Nov 26.

Department of Fixed Prosthodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.

Background/purpose: With the advancement of an over aging society, the average number of remaining teeth has increased. However, these remaining teeth do not always have sufficient alveolar bone support, and sometimes fabricated connected crowns are applied. This study evaluated the influence of crown material, crown thickness, and alveolar bone resorption on the stress distribution within the abutment teeth of connected crowns. Read More

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Wear and Marginal Quality of Esthetic Crowns for Primary Molars.

Int J Paediatr Dent 2021 Jun 17. Epub 2021 Jun 17.

Department of Pediatric Dentistry, Medical Center for Dentistry, Justus-Liebig-University Giessen and University Medical Center Giessen and Marburg (Campus Giessen), Giessen, Germany.

Background: Due to limited aesthetics of stainless steel crowns, the demand for tooth-colored crowns has recently risen. Up to now, few studies have investigated marginal integrity and wear behavior of tooth-colored primary molar crowns under subcritical load in vitro.

Aim: This in vitro study evaluated marginal quality and wear of newly introduced resin composite and hybrid ceramic crowns compared to metal and zirconia crowns. Read More

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First report of causing root and crown rot on maize in Italy.

Plant Dis 2021 Jun 15. Epub 2021 Jun 15.

UNIVERSITA' DI TORINO, AGROINNOVA, VIA L. DA VINCI 44, GRUGLIASCO, Italy, 10095;

Maize (Zea mays L.) is a cereal crop of great economic importance in Italy; production is currently of 62,587,469 t, with an area that covers 628,801 ha, concentrated in northern Italy (ISTAT 2020). Fusarium species are associated with root and crown rot causing failures in crop establishment under high soil moisture. Read More

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Retrospective study of fracture survival in endodontically treated molars: the effect of single-unit crowns versus direct-resin composite restorations.

Restor Dent Endod 2021 May 6;46(2):e29. Epub 2021 May 6.

Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.

Objectives: This study was conducted to compare the post-fracture survival rate of endodontically treated molar endodontically treated teeth (molar ETT) restored with resin composites or crowns and to identify potential risk factors, using a retrospective cohort design.

Materials And Methods: Dental records of molar ETT with crowns or composite restorations (recall period, 2015-2019) were collected based on inclusion and exclusion criteria. The incidence of unrestorable fractures was identified, and molar ETT were classified according to survival. Read More

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Fusion or Gemination? Diagnosis and Management in Primary Teeth: A Report of Two Cases.

Case Rep Dent 2021 1;2021:6661776. Epub 2021 Jun 1.

Pediatric and Preventive Dentistry Department, Faculty of Dental Medicine of Monastir, Monastir, Tunisia.

Primary double teeth (PDT), referring to either gemination or fusion, are one of the most important and frequent developmental dental anomalies that can affect children's oral health. Many clinical complications are correlated with these anomalies, such as dental caries, malocclusions, periodontal problems, and dental anomalies in permanent dentition. The aim of this report was to describe, through two cases, a case of gemination and another of fusion, the clinical management, the consequent effects, and the possible repercussions of these two developmental abnormalities on permanent successors. Read More

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Evaluation of the marginal microleakage of CAD-CAM compared with conventional interim crowns luted with different types of cement: An study.

Niger J Clin Pract 2021 Jun;24(6):828-832

Department of Restorative Dental Sciences, College of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia.

Background: Temporary stage in crowns and bridgework plays an important role in the success and failure of the final restorations. Lack of marginal seal of the temporary restorations can lead to further complications. Recently, digital dentistry has been improved in terms of marginal integrity. Read More

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Long-term clinical performance and complications of zirconia-based tooth- and implant-supported fixed prosthodontic restorations: a summary of systematic reviews.

J Dent 2021 Jun 10:103723. Epub 2021 Jun 10.

Department of Prosthetic Dentistry, UKR University Hospital Regensburg, 93042 Regensburg, Germany. Electronic address:

Objectives: To present an overview on systematic reviews on prosthodontic zirconia restorations and to discuss long-term complications as well as information on anatomical and functional changes to the masticatory system.

Data/sources: MEDLINE, EMBASE, Trip medical, and Cochrane Library databases were searched for systematic reviews up to February 2021. Bias was assessed and clinical survival and complications were analyzed. Read More

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Clinical outcomes of tooth-supported leucite-reinforced glass-ceramic crowns after a follow-up time of 13-15 years.

J Dent 2021 Jun 9;111:103721. Epub 2021 Jun 9.

Clinic for Restorative Dentistry, University of Zurich, Switzerland. Electronic address:

Objectives: The aim of this retrospective clinical study was to investigate the survival rate, technical and biologic complications of leucite-reinforced glass-ceramic crowns after a follow-up time of 13-15 years.

Material And Methods: Fifty-three patients with 131 crowns were invited to the follow-up visit. The reconstructions were re-examined clinically and radiographically using the modified USPHS criteria and periodontal parameters of probing pocket depth (PPD), plaque index (PI), sulcus bleeding index (SBI). Read More

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On the phenology of protists: recurrent patterns reveal seasonal variation of protistan (Rhizaria: Cercozoa and Endomyxa) communities in tree canopies.

FEMS Microbiol Ecol 2021 Jun;97(7)

Institute of Zoology, Terrestrial Ecology, University of Cologne, Zülpicher Str. 47b, 50674 Köln, Germany.

Tree canopies are colonized by billions of highly specialized microorganisms that are well adapted to the highly variable microclimatic conditions, caused by diurnal fluctuations and seasonal changes. In this study, we investigated seasonality patterns of protists in the tree canopies of a temperate floodplain forest via high-throughput sequencing with group-specific primers for the phyla Cercozoa and Endomyxa. We observed consistent seasonality, and identified divergent spring and autumn taxa. Read More

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Survival of stainless steel crowns and composite resin restorations in molars affected by Molar-Incisor Hypomineralization (MIH).

Int J Paediatr Dent 2021 Jun 11. Epub 2021 Jun 11.

Department of Morphology, Genetics, Orthodontics and Pediatric Dentistry, São Paulo State University (Unesp), Araraquara School of Dentistry, Araraquara, São Paulo, Brazil.

Background: Currently, there is no consensus on the superiority of any material for the restorative treatment of molars affected by Molar-Incisor Hypomineralization (MIH).

Aim: To evaluate the survival of restorations with stainless steel crown (SSC) or composite resin (CR) in first permanent molars affected by MIH for 24 months.

Design: In this retrospective cohort study, 61 CR and 54 SSC restorations performed on molars affected by MIH of patients, aged between 7 and 10, that were treated and overseen at a university dental clinic in the period of 2017-2020 were evaluated. Read More

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The interaction and interference of preformed metal crowns on magnetic resonance imaging: a scoping review with a systematic methodology.

Eur Arch Paediatr Dent 2021 Jun 11. Epub 2021 Jun 11.

School of Dental Sciences, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK.

Purpose: Preformed metal crowns are widely used to restore primary and permanent teeth. Children may require magnetic resonance imaging (MRI) for diagnosis and monitoring of diseases in the head and neck region. Metallic objects, in the field of view, may compromise the diagnostic value of an MRI. Read More

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Implants Placed in Adolescents Followed for Up to 15.5 Years: A Retrospective Case Series.

Int J Oral Maxillofac Implants 2021 May-Jun;36(3):561-568

Purpose: To evaluate the clinical outcomes of unsplinted implant-supported single crowns placed in adolescents, ages 10 to 19 years, and followed up from 5 to 15 years.

Materials And Methods: This retrospective case series evaluated the outcomes of implant-supported single crowns placed in adolescents between June 2002 and January 2015. The patients were treated with locking-taper connection implants under a two-stage rehabilitation technique. Read More

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Occlusal Thickness and Cement-Type Effects on Fracture Resistance of Implant-Supported Posterior Monolithic Zirconia Crowns.

Int J Oral Maxillofac Implants 2021 May-Jun;36(3):485-491

Purpose: To evaluate the factors that could influence the fracture resistance of implant-supported posterior monolithic zirconia crowns.

Materials And Methods: Sixty zirconia molar crowns with three different occlusal thicknesses of 0.5, 1. Read More

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An update of treatment modalities in children and adolescents with teeth affected by molar incisor hypomineralisation (MIH): a systematic review.

Eur Arch Paediatr Dent 2021 Jun 10. Epub 2021 Jun 10.

Department of Paediatric Dentistry, Institute of Dentistry, Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, UK.

Purpose: To systematically review the treatment modalities for molar-incisor hypomineralisation for children under the age of 18 years. The research question was, 'What are the treatment options for teeth in children affected by molar incisor hypomineralisation?'

Methods: An electronic search of the following electronic databases was completed MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, LILACS, Google Scholar and Open Grey identifying studies from 1980 to 2020. The PRISMA guidelines were followed. Read More

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[Clinical performance of chairside monolithic lithium disilicate glass-ceramic CAD-CAM crowns].

Shanghai Kou Qiang Yi Xue 2021 Apr;30(2):191-195

Stomatological Center, Peking University Shenzhen Hospital. Shenzhen 518036, Guangdong Province, China.

Purpose: To investigate the clinical performance of chairside monolithic lithium disilicate glass-ceramics computer-aided design(CAD)-computer aided manufacturing(CAM) crowns, and to analyze the influencing factors of cumulative survival rate.

Methods: Two hundred and fourteen patients who had chairside posterior lithium disilicate glass-ceramic CAD-CAM crowns in Peking University Shenzhen Hospital from March 2015 to March 2017 were enrolled. The crown preparations were milled using Cerec Omnicam system. Read More

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Fracture resistance of maxillary premolars restored with different endocrown designs and materials after artificial ageing.

J Prosthodont Res 2021 Jun 10. Epub 2021 Jun 10.

Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, Kiel.

Purpose: To evaluate the effect of three different designs and two monolithic ceramic materials on the durability and fracture resistance of endocrowns on maxillary first premolars, in comparison to post-and-core crowns.

Methods: Fifty-six maxillary premolars were endodontically treated and shortened to a level of 2 mm from the cervical line, and randomly categorized into six endocrown groups and post-and-core crown control group (n=8); E1; endocrowns with flat occlusal table (without ferrule), E2; endocrowns with 1.5 mm circumferential ferrule, E3; endocrowns with 1. Read More

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Tree crown injury from wildland fires: Causes, measurement, and ecological and physiological consequences.

New Phytol 2021 Jun 9. Epub 2021 Jun 9.

Tall Timbers Research Station, Tallahassee, FL, 32312, USA.

The dead foliage of scorched crowns is one of the most conspicuous signatures of wildland fires. Globally, crown scorch from fires in savannas, woodlands, and forests causes tree stress and death across diverse taxa. The term crown scorch, however, is inconsistently and ambiguously defined in the literature, causing confusion and conflicting interpretation of results. Read More

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Effect of casein-phosphopeptide amorphous calcium phosphate and fluoride with/without erbium, chromium-doped yttrium, scandium, gallium, and garnet laser irradiation on enamel microhardness of permanent teeth.

Dent Res J (Isfahan) 2021 17;18:20. Epub 2021 Mar 17.

Private Office, Tehran, Iran.

Background: Laser therapy, along with the use of fluoridated compounds is a novel technique suggested for caries prevention. Casein phosphopeptide amorphous calcium phosphate (CPP-ACP) is another product suggested for this purpose. This study compared the effect of CPP-ACP and fluoride with/without Erbium, chromium-doped yttrium, scandium, gallium, and garnet laser irradiation on enamel microhardness of permanent teeth. Read More

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Effect of cavity design and material type on fracture resistance and failure pattern of molars restored by computer-aided design/computer-aided manufacturing inlays/onlays.

Dent Res J (Isfahan) 2021 17;18:14. Epub 2021 Mar 17.

Department of Dental Materials, Faculty of Dental Medicine for Girls, Al-Azhar University, Nasr City, Cairo, Egypt.

Background: The maximum conservation of tooth structure and the use of restorative materials with elastic modulus close to the dental structure may promote greater longevity of the tooth/restoration complex. This study was conducted to evaluate the effect of cavity design and material type on fracture resistance and failure pattern of molars restored by computer-aided design/computer-aided manufacturing (CAD/CAM) inlays/onlays.

Materials And Methods: In this study, 55 human maxillary molars were embedded in resin blocks and divided into control group (CG) and five main groups: Group 1: Inlay, Group 2: Conventional onlay/mesiobuccal (MB), Group 3: Conservative onlay/MB, Group 4: Conventional onlay/MB and distobuccal (DB), and Group 5: Conservative onlay/MB and DB. Read More

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