24,590 results match your criteria crowns


Treatment Outcomes of Pulpectomy in Primary Maxillary Incisors Filled with ZOE and Metapex: A Two-year Retrospective Study.

J Clin Pediatr Dent 2021 Apr;45(2):83-89

Objectives: To address a literature gap by evaluating, in a larger set of samples, the clinical and radiographic outcomes of pulpectomy in primary maxillary incisors using ZOE and calcium hydroxide/iodoform paste. To also identify the predisposing factors for treatment outcomes.

Study Design: Medical charts of 124 patients (aged 16 to 60 months) and radiographs of their incisors (309 incisors) were reviewed (128 with ZOE and 181 with Metapex). Read More

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Clinical performance of implant crowns with customized zirconia abutments. A prospective cohort study with a 4.5- to 8.8-year follow-up.

Clin Oral Implants Res 2021 May 4. Epub 2021 May 4.

Professor emeritus, Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Switzerland.

Objective: To assess the clinical and esthetic outcomes and patient satisfaction of screw-retained one-piece implant crowns fabricated with zirconia abutments after a 4.5- to 8.8-years follow-up. Read More

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The hop downy mildew pathogen Pseudoperonospora humuli.

Mol Plant Pathol 2021 May 4. Epub 2021 May 4.

Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA.

Pseudoperonospora humuli is an obligate biotrophic oomycete that causes downy mildew, one of the most devastating diseases of cultivated hop, Humulus lupulus. Downy mildew occurs in all production areas of the crop in the Northern Hemisphere and Argentina. The pathogen overwinters in hop crowns and roots, and causes considerable crop loss. Read More

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Orthodontic space closure in a young female patient with solitary median maxillary central incisor syndrome.

Am J Orthod Dentofacial Orthop 2021 Apr 30. Epub 2021 Apr 30.

Private Practice, Bolzano and University of Ferrara, Ferrara, Italy.

A solitary median maxillary incisor can occur as a rare single dental anomaly or a symptom of the early-intrauterine developmental brain disorder of holoprosencephaly. The few published case reports about orthodontic treatment for this disorder have only described space opening for prosthodontic replacement of a central incisor. In contrast, the present patient was treated with extraction of the solitary median maxillary central incisor and orthodontic space closure with subsequent minimally invasive restorations in order to avoid looming esthetic or periodontal sequelae associated with any type of fixed bridgework or implant-borne crowns in the sensitive maxillary anterior area-which is especially indicated in young girls with a hyperdivergent growth pattern. Read More

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The marginal and internal discrepancy of zirconia coping milled by two computer-aided design-computer-aided manufacturing systems.

Authors:
Somchai Urapepon

J Indian Prosthodont Soc 2021 Apr-Jun;21(2):192-197

Department of Prosthodontics, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.

Aims: : This study aimed to evaluate the marginal and internal discrepancy of the zirconia coping fabricated by two dental computer-aided design-computer-aided manufacturing (CAD-CAM) systems.

Settings And Design: In vitro comparative study.

Materials And Methods: Twenty zirconia crowns fabricated from inCoris ZI by Cerec InLab CAD-CAM system (Dentsply Sirona Inc, USA) and Ceramill ZI by Ceramill CAD-CAM system (Amann Girrbach, Austria) were measured the discrepancy at six locations using silicone replica technique. Read More

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The Effects of Beverages and Surface Treatments on the Color Stability of 3D-printed Interim Restorations.

J Prosthodont 2021 May 3. Epub 2021 May 3.

Associate Professor, Program Director, and Interim Chair, Advanced Education Program in Prosthodontics, Department of Prosthodontics, Indiana University School of Dentistry, Indianapolis, IN.

Purpose: To evaluate the color stability of 3D-printed interim restorations with different surface treatments while immersed in various staining solutions or beverages (artificial saliva, tea, coffee, and wine) for 6 months.

Material And Methods: An acrylic tooth was prepared for an all-ceramic full-coverage restoration. A laboratory scanner (7Series Dental Model and Impression Scanner; Dental Wings Inc, Montréal, Canada) was used to digitize the prepared abutment tooth. Read More

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Effect of virtual cement gap settings on the marginal fit of cemented resin-ceramic crowns on implant abutments.

J Prosthet Dent 2021 May;125(5):804.e1-804.e6

Lecturer, Department of Fixed Prosthodontics, College of Dentistry, University of Tanta, Tanta, Egypt.

Statement Of Problem: Agreement on the perfect virtual cement space value for computer-aided design and computer-aided manufacturing (CAD-CAM) implant-supported resin-ceramic crowns with the best marginal adaptation is lacking. The range of cement gap settings in some CAD design software programs is wide (0 to 200 μm), and manufacturer recommendations regarding the best cement gap setting for certain types of ceramics is not specific.

Purpose: The purpose of this in vitro study was to evaluate the effect of virtual cement gap settings on the marginal fit of cemented resin-ceramic crowns on implant abutments. Read More

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In vitro evaluation of material dependent force damping behavior of implant-supported restorations using different CAD-CAM materials and luting conditions.

J Prosthet Dent 2021 Apr 28. Epub 2021 Apr 28.

Associate Professor, Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt; Head of Fixed prosthodontics department, Faculty of Dentistry, British University, Cairo, Egypt.

Statement Of Problem: Although force-damping behavior that matches natural teeth may be unobtainable, an optimal combination of crown material and luting agent might have a beneficial effect on the force absorption capacity of implant-supported restorations. However, the force-absorbing behavior of various restorative materials has not yet been satisfactorily investigated.

Purpose: The purpose of this in vitro study was to evaluate the material dependent force-damping behavior of implant-supported crowns fabricated from different computer-aided design and computer-aided manufacturing (CAD-CAM) materials luted to implant abutments under different conditions. Read More

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Randomized clinical trial of zirconia and polyetheretherketone implant abutments for single-tooth implant restorations: A 5-year evaluation.

J Prosthet Dent 2021 Apr 28. Epub 2021 Apr 28.

Assistant Professor, College of Applied Medical Sciences, King Khalid University, Abha, Saudi Arabia.

Statement Of Problem: Titanium-supported polyetheretherketone (PEEK) abutments provide an economic alternative to zirconia abutments in esthetically important areas. Research comparing the performance regarding esthetics, longevity, and biologic parameters of PEEK abutments is lacking.

Purpose: The purpose of this clinical study was to determine whether PEEK implant abutments provide similar esthetic and biologic parameters and survival rates as zirconia implant abutments. Read More

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A Comparison of Accuracy of Different Dental Restorative Materials between Intraoral Scanning and Conventional Impression-Taking: An In Vitro Study.

Materials (Basel) 2021 Apr 19;14(8). Epub 2021 Apr 19.

Department of Prosthodontics, Yonsei University College of Dentistry, Yonsei-ro 50-1, Seodaemun-gu, Seoul 03722, Korea.

The properties of underlying substrates influence the quality of an intraoral scan, but few studies have compared the outcomes using common restorative materials. In this study, we aimed to compare the accuracy of digital and conventional impressions recorded for four different dental materials as the substrates. Experimental crowns were produced with a metallic surface (gold or cobalt-chromium alloy (Co-Cr)) or without a metallic surface (zirconia or PMMA (polymethyl methacrylate)). Read More

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New Rehabilitation Concept for Maxillary Edentulism: A Clinical Retrospective Study of Implant Crown Retained Removable Partial Dentures.

J Clin Med 2021 Apr 19;10(8). Epub 2021 Apr 19.

Department of Mathematics, Ewha Womans University, Seoul 03760, Korea.

There have been no studies of implant-crown-retained removable partial dentures (IC-RPD) for the treatment of maxillary edentulism. The purpose of this study was to perform clinical and radiographic evaluations of implants in IC-RPD compared to implant overdentures (IOD) in maxillary edentulous patients. Twenty IC-RPDs with 74 splinted implant crowns and 18 IODs with 71 implants retained with magnet attachments were observed in 38 patients. Read More

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Failure Load and Fatigue Behavior of Monolithic Translucent Zirconia, PICN and Rapid-Layer Posterior Single Crowns on Zirconia Implants.

Materials (Basel) 2021 Apr 15;14(8). Epub 2021 Apr 15.

Department of Prosthodontics, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine-University, 40225 Düsseldorf, Germany.

This laboratory study aimed to evaluate the thermo-mechanical fatigue behavior and failure modes of monolithic and rapid-layer posterior single-crowns (SCs) supported by zirconia implants.

Methods: 120 all-ceramic crowns supported by one-piece zirconia implants (ceramic.implant; vitaclinical) were divided into five groups ( = 24 each): Group Z-HT: 3Y-TZP monolithic-zirconia (Vita-YZ-HT); Group Z-ST: 4Y-TZP monolithic-zirconia (Vita-YZ-ST); Z-XT: 5Y-TZP monolithic-zirconia (Vita-YZ-XT); Group E: monolithic-polymer-infiltrated ceramic network (PICN,Vita-Enamic); Group RL (rapid layer): PICN-"table-top" (Vita-Enamic), 3Y-TZP-framework (Vita-YZ-HT). Read More

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Influence of Post-Core and Crown Type on the Fracture Resistance of Incisors Submitted to Quasistatic Loading.

Polymers (Basel) 2021 Apr 2;13(7). Epub 2021 Apr 2.

Turku Clinical Biomaterial Center-TCBC, Department of Biomaterials Science, Institute of Dentistry, University of Turku, 20500 Turku, Finland.

The aim of this paper was to evaluate the fracture resistance and failure type of maxillary incisor teeth, rebuilt with various types of post-core restorations and full crowns made of either direct conventional particulate filler composite (PFC, G-aenial Anterior, GC, Tokyo, Japan) or indirect CAD/CAM restorations (composite Cerasmart 270 and glass ceramic LiSi Block from GC). One hundred ( = 10/group) central incisors were cut and divided into 10 experimental groups restored with different approaches. In approach A, teeth were restored with a core build-up composite (Gradia Core, GC) for a core and full crown of PFC. Read More

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Different Treatment Modalities Using Dental Implants in the Posterior Maxilla: A Finite Element Analysis.

Braz Dent J 2021 Jan-Feb;32(1):34-41

School of Dentistry, UniEVANGÉLICA - Anápolis University, Anápolis, GO, Brazil.

The objective of this study was to compare the biomechanical behavior of peri-implant bone tissue and prosthetic components in two modalities of treatment for posterior region of the maxilla, using short implants or standard-length implants associated with bone graft in the maxillary sinus. Four 3D models of a crown supported by an implant fixed in the posterior maxilla were constructed. The type of implant: short implant (S) or standard-length implant with the presence of sinus graft (L) and type of crown retention: cemented (C) or screwed (S) were the study factors. Read More

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Bio-C Repair - A New Bioceramic Material for Root Perforation Management: Two Case Reports.

Braz Dent J 2021 Jan-Feb;32(1):104-110

Department of Dentistry, PUC Minas - Pontifícia Universidade Católica de Minas Gerais, Belo Horizonte, MG, Brazil.

These case reports aimed to describe the management of lateral perforation in the middle cervical third of the root in two maxillary incisors with pulp canal calcification using Bio-C Repair, with safe and viable clinical treatment strategies. Digital radiographic exams were obtained with different angles and analyzed using different filters. Cone-beam computed tomography (CBCT) images were requested to show the actual position of the canal, location of the perforation, and guide the strategic planning of the case. Read More

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The effect of preparation taper on the resistance to fracture of monolithic zirconia crowns.

Dent Mater 2021 Apr 25. Epub 2021 Apr 25.

Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, Norway.

Objective: Monolithic zirconia crowns have become a viable alternative to conventional layered restorations. The aim of this study was to evaluate whether the taper, and thus wall thickness, of the abutment or pre-defined cement space affect the fracture resistance or fracture mode of monolithic zirconia crowns.

Methods: A model tooth was prepared with a taper of 15° and a shallow circumferential chamfer preparation (0. Read More

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One-Year Results Assessing the Performance of Prosthetic Rehabilitations in the Posterior Maxilla Supported by 4-mm Extrashort Implants Splinted to 10-mm Implants: A Prospective Case Series.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):371-378

Purpose: The aim of this study was to evaluate the survival and success rates of oral rehabilitations in a shortened maxillary dental arch and expanded maxillary sinus with 4-mm extrashort implants splinted to longer ones.

Materials And Methods: One 10-mm and one/two extrashort 4-mm titanium-zirconium SLActive tissue-level dental implants were inserted into 11 patients with limited vertical bone availability due to an expanded maxillary sinus antrum. Immediately and 6 months after insertion, implant stability resonance frequency analysis (RFA) values were assessed with an Osstell device. Read More

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Fracture Resistance of Zirconia, Polyetheretherketone, and Polyetherketoneketone Implant Abutments After Aging.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):332-340

Purpose: This study aimed to assess the fracture resistance of zirconia (Zr), reinforced polyetheretherketone (PEEK), and polyetherketoneketone (PEKK) implant abutments restored with glass-ceramic crowns after thermomechanical aging.

Materials And Methods: Zr, reinforced PEEK, and PEKK titanium base abutments were divided into three groups (n = 10). CAD/CAM maxillary central incisor crowns were fabricated using monolithic lithium disilicate and luted to the abutments using resin cement. Read More

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Thermal Changes at the One-Piece Implant Surface During the Setting of Two Autopolymerized Acrylic Resins.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):327-331

Purpose: To compare the temperature changes during the setting process of two provisional crown materials, polymethyl methacrylate (PMMA)-based acrylic resin (Ac) and bis-acryl composite resin (Co), at the first thread surface of one-piece implants.

Materials And Methods: Twenty-two 3.3-mm-diameter one-piece implants were divided into two groups according to the provisional restoration material. Read More

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Mechanical Stability of Restorations Supported by Titanium Base, Zirconia, and Polyetherketoneketone Abutments on One- and Two-Piece Zirconia Implants.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):313-321

Purpose: To evaluate survival, complication rates, and bending moments of one- and two-piece zirconia implants restored with different abutment materials and lithium disilicate crowns after aging, compared to titanium implants restored with titanium base-supported lithium disilicate crowns.

Materials And Methods: Sixty anterior crowns were either screwretained on two-piece titanium implants (C) and two-piece zirconia implants (T1, T2, T3) or cemented on one-piece zirconia implants (T4), resulting in 5 groups with 12 specimens each. For the screw-retained crowns, different abutment materials and implant connections were tested: titanium base with internal conical connection and horizontal joint component (C and T2), zirconia with internal hexagonal connection and horizontal joint component (T1), and polyetherketoneketone with internal hexagonal connection and horizontal joint component (T3). Read More

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Investigation of Conventional vs Nonoriginal CAD/CAM Bars with Production Stage Differences: An In Vitro Precision Study Using a Novel Technique.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):234-241

Purpose: The aim of this study was to evaluate the precision of fit of bar frameworks fabricated using three different production processes and the effect of changes in the CAD/CAM process steps on the precision of the resulting bar frameworks.

Materials And Methods: Four implants were applied to a mandibular phantom model, and three different production techniques were used to fabricate 30 bar frameworks. In the first group, the bar frameworks were fabricated with the conventional production process (the lost-wax technique; n = 10). Read More

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Customized fiber posts in root canals prepared with and without laser application: a pull-out evaluation.

Gen Dent 2021 May-Jun;69(3):52-56

This study evaluated the effect of fiber post customization and laser application on the results of pull-out tests in endodontically treated teeth. Forty-eight bovine incisors were stored in aqueous 2% formaldehyde (pH 7.0) for 30 days. Read More

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[Comparison of fracture strength of two chairside CAD/CAM ceramic blocs with different thickness].

Shanghai Kou Qiang Yi Xue 2021 Feb;30(1):7-12

Jiangsu Key Laboratory of Oral Disease, Nanjing Medical University, Department of Prosthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University. Nanjing 210029, Jiangsu Provinces, China.

Purpose: To provide theoretical basis for clinical CAD/CAM restorations with a comparison of the fracture strength between two chairside CAD/CAM immediate restorative materials (IPS e.max CAD and Vita Enamic) with different occlusal thickness in vitro.

Methods: IPS e. Read More

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February 2021

Clinical and radiographic variables related to implants with simultaneous grafts among type 2 diabetic patients treated with different hypoglycemic medications: a retrospective study.

BMC Oral Health 2021 Apr 27;21(1):214. Epub 2021 Apr 27.

State key Laboratory of military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Engineering Research Center for Dental Materials and Advanced Manufacture, Department of Oral Implants, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, Shaanxi, China.

Background: The influence of different hypoglycemic agents on peri-implant variables among type 2 diabetes mellitus patients is still unclear. Therefore, the aim of this study was to assess the radiographic marginal bone loss and clinical parameters around implants in patients using different hypoglycemic agents.

Methods: In this retrospective cohort study, the dental implant records of type 2 diabetes mellitus patients who met the inclusion criteria were collected. Read More

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Marginal Integrity of CAD/CAM Ceramic Crowns Using Two Different Finish Line Designs.

Med Princ Pract 2021 Apr 26. Epub 2021 Apr 26.

Statement of problem- Research on evaluation of crowns made by the latest CAD/CAM systems for their marginal adaptation is scarce. Purpose- The purpose of this in vitro study was to evaluate the marginal integrity of crowns fabricated by the latest Chairside Economical Restorations of Esthetic Ceramic (CEREC) system using two different finish line preparation designs: Chamfer and Shoulder. Material and methods- Typhodont teeth were equally divided into two groups, group A and B. Read More

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Different Post Placement Strategies for the Restoration of Endodontically Treated Maxillary Premolars with Two Roots: Single Post vs Double Post.

J Contemp Dent Pract 2020 Dec 1;21(12):1374-1378. Epub 2020 Dec 1.

Department of Medical Biotechnologies, Unit of Endodontics and Restorative Dentistry, University of Siena, Siena, Italy.

Aim And Objective: The present study compared the fracture strength and failure pattern of endodontically treated, bi-rooted, maxillary premolars with different number of coronal walls and postendodontic restoration (one vs double post).

Materials And Methods: 105 premolars were divided into 3 groups according to the number of residual walls: control group (intact teeth; = 15), group 1 (3 residual walls; = 45), group 2 (2 residual walls; = 45). Each test group was then divided into 3 subgroups ( = 15 each) according to postendodontic restoration: no post (A), 1 post (B) or 2 posts (C). Read More

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December 2020

GRAS transcription factor LOSS OF AXILLARY MERISTEMS is essential for stamen and runner formation in wild strawberry.

Plant Physiol 2021 Apr 23. Epub 2021 Apr 23.

Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China.

Axillary bud development is a major factor that impacts plant architecture. A runner is an elongated shoot that develops from axillary buds and is frequently used for clonal propagation of strawberry. However, the genetic control underlying runner production is largely unknown. Read More

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Comparative study of different cytotoxicity of bonding systems with different dentin thickness on L929 cell line: An experimental study.

Dent Res J (Isfahan) 2020 Nov-Dec;17(6):424-432. Epub 2020 Dec 10.

Oral and Dental Diseases Research Center, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran.

Background: Dentin-bonding agents should have good biocompatibility as they come into close and prolonged contact with vital dentin. The present study aimed to evaluate and compare the cytotoxicity of total etch and self-etch dentin bonding systems with two different dentin thickness on L929 cell line.

Materials And Methods: In this study 80 Class I cavities were prepared on the occlusal surfaces. Read More

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December 2020

The effect of sterilization and disinfection on the physical-mechanical properties of preformed crowns.

J Indian Soc Pedod Prev Dent 2021 Jan-Mar;39(1):53-60

Department of Pediatric and Preventive Dentistry, Karnavathi School of Dentistry, Gandinagar, Gujarat, India.

Introduction: Different sizes of crowns may be tried on children since there is no universal crown size because of distinctions in tooth morphology from one child to other. During the process of trial and error, the crown gets contaminated which needs to be sterilized for reuse of crown. This study was carried out to evaluate the physical-mechanical outcome after the sterilization and disinfection of pediatric preformed crowns. Read More

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Application of multi-directional forged titanium for prosthetic crown fabrication by CAD/CAM.

Dent Mater J 2021 Apr 20. Epub 2021 Apr 20.

Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University.

Titanium are often used as dental materials, pure titanium present low strength and titanium alloy is reported poor biocompatibility, respectively. To overcome the problem, we fabricated high-strength multi-directional forged (MDF) titanium with improved mechanical properties without changing the chemical composition and evaluated its applicability in prosthetic crowns. Cutting tests: the average absolute value of the difference before and after cutting was calculated as the uncut amount. Read More

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