1,463 results match your criteria push-out


Photodynamic therapy and other pretreatment methods on epoxy-based glass fiber post on the push-out bond strength to radicular dentin.

Photodiagnosis Photodyn Ther 2021 Sep 9:102526. Epub 2021 Sep 9.

Dental Health Department, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia. Electronic address:

Aim: To assess the push-out bond strength (PBS) of glass fiber post (GFP) conditioned using different surface treatment regimens bonded to radicular dentin MATERIAL AND METHODS: Sixty central incisors and canine were collected and disinfected. Decoronation following working length was determined using K-file. Rotary file system was used for cleaning and shaping. Read More

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September 2021

Push-Out Method for Micro Measurements of Interfacial Strength in Aluminium Alloy Matrix Composites.

Materials (Basel) 2021 Sep 6;14(17). Epub 2021 Sep 6.

Faculty of Mechanical Engineering, Institute of Robots & Machine Design, Military University of Technology, ul. Gen. S. Kaliskiego 2, 00-908 Warsaw, Poland.

The main goal of this work was the evaluation of the interfacial strength of the carbon fibres/aluminium matrix interface dependently on the utilised composite fabrication method, namely high pressure die casting and gas pressure infiltration. In addition, the influence of a Ni-P coating on the C-fibres was investigated. The proposed measurements of the interfacial strength were carried out by means of the "push-out" method. Read More

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September 2021

Effect of Sonic Activation on Push-Out Bond Strength of Fiber Post: An In Vitro Study.

Authors:
Rizwan Jouhar

Materials (Basel) 2021 Sep 3;14(17). Epub 2021 Sep 3.

Department of Restorative Dentistry and Endodontics, College of Dentistry, King Faisal University, Al-Ahsa 31982, Saudi Arabia.

This study aimed to evaluate the effectiveness of conventional and sonic activation techniques on push-out bond strength of fiber post cemented with two different monomers containing self-adhesive resin cement (SARC). Four groups (n = 19 each) were made based on the type of SARC (Rely X U200 and Panavia SA) and technique (conventional and sonic activation). After placing the fiber post, each root was sectioned into 2 mm coronal, middle, and apical portions, and a push-out bond strength test was performed using a universal testing machine. Read More

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September 2021

Influence of the use of chelating agents as final irrigant on the push-out bond strength of epoxy resin-based root canal sealers: A systematic review.

Aust Endod J 2021 Sep 9. Epub 2021 Sep 9.

Department of Endodontics, School of Dentistry, University of the State of Rio de Janeiro (UERJ), Rio de Janeiro, Brazil.

This systematic review (PROSPERO - CRD42020150722) was performed to answer the following question: Does the use of chelating agents affect the dislodgment resistance of epoxy resin-based root canal sealers? A search was conducted in PubMed, EMBASE, Scopus, LILACS and Web of Science, hand searching of two endodontic journals and grey literature until September 2020. Extracted data included: teeth used, sample size, root canal preparation, irrigant, chelating solution, neutralisation solution, type of resin-based sealer and obturation approach, storage method and duration, root third and slice thickness, plunger dimension and loading direction and the push-out testing parameters and values. The search retrieved a total of 2. Read More

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September 2021

A laboratory study to assess the physical, mechanical, and 3-D structural properties of nano-apatite grafted glass fibre-based endodontic posts.

Int Endod J 2021 Sep 8. Epub 2021 Sep 8.

Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia.

Aim: To fabricate and characterise nano-hydroxyapatite (nHA) grafted and non-grafted glass fibre-based endodontic posts.

Methodology: Experimental glass fibre posts were fabricated using silanised nHA grafted (ex-HA) and non-grafted glass fibre (ex-P) reinforced resins. The structural analysis and morphological patterns were analysed with Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy, respectively. Read More

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September 2021

Strength, corrosion resistance and cellular response of interfaces in bioresorbable poly-lactic acid/Mg fiber composites for orthopedic applications.

J Mech Behav Biomed Mater 2021 Nov 14;123:104781. Epub 2021 Aug 14.

IMDEA Materials, C/Eric Kandel 2, 28906, Getafe,Madrid, Spain; Department of Materials Science, Polytechnic University of Madrid, 28040, Madrid, Spain. Electronic address:

The shear strength and the corrosion resistance of the fiber/matrix interface after immersion in simulated body fluid was studied in poly-lactic acid/Mg fiber composites. The shear strength of the interface was measured by means of push-out tests in thin slices of the composite perpendicular to the fibers. It was found that the interface strength dropped from 15. Read More

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November 2021

Effect of nonthermal atmospheric plasma on the push-out bond strength of epoxy resin-based and bioceramic root canal sealers: An study.

J Conserv Dent 2021 Jan-Feb;24(1):41-45. Epub 2021 Jul 5.

Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram, Kerala, India.

Aim: The aim of this study was to evaluate the effect of nonthermal atmospheric plasma (NTAP) on the bond strength of epoxy resin-based and bioceramic root canal sealers.

Materials And Methods: Freshly extracted forty ( = 40) single-rooted mandibular premolar teeth were divided into four groups ( = 10) based on the sealer used and NTAP application - Group 1: Epoxy resin-based sealer (AH Plus) without NTAP application, Group 2: Epoxy resin-based sealer (AH Plus) with NTAP application for 30 s, Group 3: Bioceramic sealer (BioRoot RCS) without NTAP application, and Group 4: Bioceramic sealer (BioRoot RCS) with NTAP application for 30 s. After NTAP application in Groups 2 and 4, all the samples were obturated using sealers according to their grouping protocols. Read More

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Interface Controlled Micro- and Macro-Mechanical Properties of Vibration Processed Carbon Fiber/Epoxy Composites.

Polymers (Basel) 2021 Aug 17;13(16). Epub 2021 Aug 17.

College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.

The fiber-resin interface is an important component that significantly affects mechanical properties of composites. Random vibration-assisted vacuum processing (RVAVP), a new method to improve the adhesion of the fiber-resin interface, was presented. The effects of different curing processes on mechanical properties were comprehensively assessed by combining the fiber push-out test, finite element model simulation, cure monitoring approach, and short-beam three-point bending test, and the correlation between fiber volume fraction and mechanical properties was quantified by a facile thermogravimetric analysis-based methodology. Read More

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The Effects of Various Final Irrigants on the Bond Strength of Root Dentin Exposed to Chloroform: An Study.

J Pharm Bioallied Sci 2021 Jun 5;13(Suppl 1):S629-S632. Epub 2021 Jun 5.

Department of Oral and Maxillofacial Surgery, Annoor Dental College, Muvattupuzha, Kerala, India.

Aim: The aim of the study was to assess the reaction of different final irrigants to the bond strength of root dentin exposed to chloroform.

Materials And Methods: Fifty extracted maxillary central incisors were selected. Working length was determined, and canal was instrumented with ProTaper rotary system (Dentsply Maillefer) till F4 file. Read More

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Impact of different surface treatment methods on bond strength between fiber post and composite core material.

Saudi Dent J 2021 Sep 19;33(6):334-341. Epub 2020 Mar 19.

Substitutive Dental Sciences Department, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.

Purpose: To assess the impact of different surface treatments on the push-out bond strength between fiber post and a composite resin core material.

Material And Methods: Seventy-two glass-fiber posts were randomly assigned into six groups according to the method of surface treatment: Control (no treatment), silane, sandblasting, hydrofluoric acid, hydrogen peroxide, and hydrogen peroxide with sandblasting. Two posts from each group were inspected under a scanning electron microscope to assess the surface modifications and 10 posts were employed for the push-out test. Read More

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September 2021

Considerations on the animal model and the biomechanical test arrangements for assessing the osseous integration of orthopedic and dental implants.

MethodsX 2021 18;8:101352. Epub 2021 Apr 18.

Department of Trauma Surgery, Orthopedics and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany.

In implant research, a central objective is to optimize the osseous integration of implants according to their function and scope of application. In the preclinical stage, the animal model is commonly used to study implants for in vivo host tissue response and biomechanical tests are a frequently applied method for characterization of contact phenomena. However, the individual parameters and options for both the animal model and the biomechanical test arrangements vary widely, which can negatively affect the reliability and comparability of the results. Read More

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Effect of indirect ultrasonic activation of modified bioceramic materials on the bond strength and tubular penetration in root canals.

Dent Res J (Isfahan) 2021 22;18:45. Epub 2021 Jun 22.

Department of Conservative Dentistry and Endodontics, Sibar Institute of Dental Sciences, Guntur, Andhra Pradesh, India.

Background: To maintain the integrity of the interface between root canal filling and radicular dentin an ideal endodontic biomaterial should have good adhesion. This study was aimed to evaluate the bond strength and tubular penetration of modified bioceramic materials by indirect ultrasonic activation.

Materials And Methods: In the present experimental study, 120 coronal root slices of 2 mm were prepared from mandibular premolars and randomly divided into six groups ( = 20) in accordance to placement techniques: Group I: Nano Biodentine-manual, Group II: CaCl modified ProRootMTA-manual (MM), Group III: Biodentine-manual, Group IV: Nano Biodentine: Ultrasonic, Group V: CaCl modified ProRootMTA-ultrasonic, and Group VI: Biodentine-ultrasonic (BDU). Read More

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Surgical procedure to restore shoulder external rotation in post-traumatic brachial plexus lesions in adults.

Authors:
Ph Valenti

Hand Surg Rehabil 2021 Aug 15. Epub 2021 Aug 15.

Institut de la Main, Paris Shoulder Unit, Clinique Bizet, 23, Rue Georges Bizet, 75116 Paris, France. Electronic address:

The lack of active external rotation following a brachial plexus injury in adults is very disabling and very challenging to solve. If direct nerve surgery or nerve transfer fails or if the patient is seen too late, palliative surgery is the last resort. Shoulder fusion can stabilize the joint to increase strength at the elbow, but the patient loses all external rotation. Read More

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Data on the push-out bond strength of three different root canal treatment sealers.

Bioinformation 2021 31;17(1):67-72. Epub 2021 Jan 31.

Department of Conservative Dentistry & Endodontics, Hazribagh college of dental sciences & hospital, Jharkhand, India.

It is of interest to document data on the push - out bond strength of three different root canal treatment sealers such as MTA Fillapex (MTA based), AH plus (Epoxy Resin based) and Apexit plus (Calcium hydroxide based). Forty-five freshly extracted human maxillary central incisors with closed apices were selected randomly. All the teeth were sectioned at cement-enamel junction using a diamond disc before starting the root canal preparation to obtain root length of 12 mm. Read More

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January 2021

Semaphorin3A promotes osseointegration of titanium implants in osteoporotic rabbits.

Clin Oral Investig 2021 Aug 6. Epub 2021 Aug 6.

Department of Stomatology, Nanjing Integrated Traditional Chinese and Western Medicine Hospital, No.179, Xiaolingwei Road, Xuanwu District, Nanjing, 210014, Jiangsu, China.

Objective: In the present study, we intend to assess the function of Sema3A in osteointegration of titanium implants both in vivo and in vitro.

Material And Methods: Briefly, Sema3A was transfected in HBMSCs cells to detect its effect on osteogenesis. Subsequently, an in vivo rabbit model was established. Read More

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Does the bonding effectiveness of a fiber post/resin composite benefit from mechanical or chemical treatment? Seven methods for saliva-contaminated surfaces.

J Prosthodont Res 2021 Aug 4. Epub 2021 Aug 4.

Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Osaka.

Purpose: This study examined four cleaning methods and three chemical treatments for artificial saliva-contaminated fiber posts in terms of bonding durability to resin composite core materials.

Methods: Non-contaminated fiber posts (Tokuyama FR Post, Tokuyama Dental) and those contaminated (GC Fiber Post, GC) with artificial saliva (Saliveht Aerosol, Teijin Pharma) were used. Washing and drying (WD), alcohol cleaning (AlC), H3PO4 etching (P/WD), alumina blasting (B/D) for decontamination and silanization (Clearfil Ceramic Primer Plus, Kuraray Noritake Dental, Si), resin priming (HC Primer, Shofu, MMA), and bonding resin application (Clearfil Universal Bond Quick, Kuraray Noritake Dental, BR) for chemical treatment were performed. Read More

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Effectiveness of photodynamic therapy on bonding strength and failure modes of fiber-posts in c-shaped treated root canals.

Photodiagnosis Photodyn Ther 2021 Sep 30;35:102469. Epub 2021 Jul 30.

Dental Health Department, College of Applied Medical Sciences, King Saud University, P.O Box 10219, Riyadh 11433, Saudi Arabia.

Aim: The present study aimed to assess the push-out bond strength (PBS) and failure modes of fiber-posts after photodynamic therapy (PDT) and Erbium yttrium scandium gallium garnet (Er,Cr:YSGG) in c-shaped canals.

Methods: Sixty molars with c-shaped root configuration were studied. The endodontic prepared teeth specimen were equally randomized into four groups: i) photodynamic therapy (PDT); ii) Er,Cr:YSGG; iii) chlorhexidine and; iv) control group. Read More

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September 2021

Effect of Irrigating Agitation after Root End Preparation on the Wall Cleaning and Bond Strength of Calcium Silicate Material in Retrograde Obturation.

Eur J Dent 2021 Jul 24. Epub 2021 Jul 24.

Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.

Objective:  The study aimed to evaluate the cleaning efficacy of irrigant activation with a new ultrasonic tip in root-end preparations and to determine its influence on the bond strength of calcium silicate-based material.

Materials And Methods:  Maxillary canines were prepared and filled, and their root ends resected. Root-end cavities were ultrasonically prepared and randomly distributed into four groups according to the final irrigation protocols: G1 (ultrasonic irrigation [UI] + saline solution [SS]), G2 (syringe irrigation [SI] + SS), G3 (UI + ethylenediaminetetraacetic acid [EDTA]), and G4 (SI + EDTA). Read More

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Heat-Affected Zone and Mechanical Analysis of GFRP Composites with Different Thicknesses in Drilling Processes.

Polymers (Basel) 2021 Jul 8;13(14). Epub 2021 Jul 8.

Mechanical Engineering Department, Faculty of Engineering, King Abdulaziz University, Jeddah 22254-2265, Saudi Arabia.

This article presents a comprehensive thermomechanical analysis and failure assessment in the drilling of glass fiber-reinforced polymer (GFRP) composites with different thicknesses using a CNC machine and cemented carbide drill with a diameter of 6 mm and point angles of = 118°. The temperature distribution through drilling was measured using two techniques. The first technique was based on contactless measurements using an IR Fluke camera. Read More

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Improved Biological Responses of Titanium Coating Using Laser-Aided Direct Metal Fabrication on SUS316L Stainless Steel.

Materials (Basel) 2021 Jul 14;14(14). Epub 2021 Jul 14.

Department of Orthopaedic Surgery, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.

Direct metal fabrication (DMF) coatings have the advantage of a more uniform porous structure and superior mechanical properties compared to coatings provided by other methods. We applied pure titanium metal powders to SUS316L stainless steel using laser-aided DMF coating technology with 3D printing. The purpose of this study was to determine the efficacy of this surface modification of stainless steel. Read More

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Effect of EDTA Concentrations as Irrigation Solution on Bonding of Fiber Posts into Root Canals with Universal Adhesives.

J Adhes Dent 2021 Jul;23(4):347-356

Purpose: To evaluate the effect of different concentrations of ethylene-diamine-tetra acetic acid (EDTA) on bond strength (BS) and nanoleakage (NL) of fiber posts bonded into root canals.

Materials And Methods: Seventy-two single roots were endodontically treated and divided into six groups (n = 12), according to the combination of the following factors: surface treatment (no irrigation [control], 17% EDTA, or 24% EDTA), and composite cement applied with an adhesive used in a self-etch mode (Single Bond Universal/RelyX Ultimate [SB], 3M Oral Care; Ambar Universal/Allcem [AM], FGM). After fiber post cementation, six 1-mm-thick disks were obtained for each root. Read More

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Adhesive strength of fiberglass posts treated with thio-urethane-based experimental silanes.

Eur Oral Res 2021 May;55(2):60-66

State University of Campinas, Piracicaba Dental School, Department of Prosthodontics and Periodontology, SP, Brazil.

Purpose: The aim of this study was to evaluate the adhesive bond strength of fiberglass posts treated with experimental silanes based on thio-urethane and submitted to thermo and mechanical cycles.

Materials And Methods: Bovine roots were divided into six groups: RX-RU2 (RelyX CP + RelyX U200); PETMP-HDDI-RU2 (PETMP-HDDI + RelyX U200); PETMP-BDI-RU2 (PETMP-BDI + RelyX U200); RX-RU (RelyX CP + RelyX Ultimate); PETMP-HDDI-RU (PETMP-HDDI + RelyX Ultimate); PETMP-BDI-RU (PETMP-BDI + RelyX Ultimate). One slice from each root third (n=10) was submitted to the push-out test and the values evaluated with R Program statistical analysis, while the failure pattern assessed in percentage. Read More

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Influence of Dentin Priming with Tannin-Rich Plant Extracts on the Longevity of Bonded Composite Restorations.

ScientificWorldJournal 2021 15;2021:1614643. Epub 2021 Jun 15.

São Paulo State University (UNESP), School of Sciences, POSMAT-Post-Graduate Program in Materials Science and Technology, Bauru, SP, Brazil.

Objective: This study evaluated the influence of bioactive plant extracts as dentin biomodifying agents to improve the longevity of bonded restorations. For that, plant extracts were applied to the dentin surface prior to the adhesive system.

Materials And Methods: Bovine incisors were ground flat to obtain 2 mm thick slices in which conical preparations were made ( = 10). Read More

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Evaluation of the sealing capability and morphological fit of prefabricated dowels and fiber-reinforced composite resin: An in vitro study.

J Prosthet Dent 2021 Jul 1. Epub 2021 Jul 1.

Professor, Specialty in Aesthetic, Cosmetic, Restorative, and Implantological Dentistry, Faculty of Dentistry, Autonomous University of San Luis Potosí, San Luis Potosí, Mexico. Electronic address:

Statement Of Problem: Prefabricated dowels do not always provide intraradicular sealing in the root canal dentin, and the lack of sealing predisposes the dowel to adhesive failure and debonding. It is unclear if fiber-reinforced composite resin dowels provide better sealing.

Purpose: The purpose of this in vitro study was to evaluate the intraradicular sealing and morphological fit of prefabricated dowels and fiber-reinforced composite resin dowels in root canal dentin. Read More

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Effect of Different Resin Cements on the Bond Strength of Custom-made Reinforced Glass Fiber Posts-A Push-out Study.

J Contemp Dent Pract 2021 Mar 1;22(3):219-223. Epub 2021 Mar 1.

Department of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil, Phone: +55 (31) 33194414, e-mail:

Aim And Objective: This study aims to evaluate the effect of different resin cements on the bond strength (BS) of custom-made glass fiber posts (GFPs) using the push-out test.

Materials And Methods: Twenty-four uniradicular bovine teeth were selected. The crowns were sectioned at the cementoenamel junction, and the root canals were treated. Read More

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Push-Out Bond Strength Evaluation of Fiber-Reinforced Composite Resin Post Cemented with Self-Adhesive Resin Cement Using Different Adhesive Bonding Systems.

Materials (Basel) 2021 Jun 29;14(13). Epub 2021 Jun 29.

Oral Science Research Center, Department of Conservative Dentistry, College of Dentistry, Yonsei University, Seoul 03722, Korea.

The purpose of this in vitro study was to evaluate the push-out bond strength of fiber-reinforced resin posts using self-adhesive cements with different adhesive systems. A total of 50 single-rooted human maxillary premolars with fully developed apices and 15-16 mm straight root canals were selected. The teeth were divided into 10 groups with coronal and apical parts according to the adhesive bonding system and luting material used: one universal adhesive with MDP-containing self-adhesive resin cement; another universal adhesive with MDP-containing self-adhesive resin cement; universal primer with MDP-containing self-adhesive resin cement; universal primer with dual-cure resin cement; MDP-containing self-adhesive resin cement only (Control). Read More

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Experimental Study on the Mechanical Properties of Perfobond Rib Shear Connectors with Steel Fiber High Strength Concrete.

Materials (Basel) 2021 Jun 17;14(12). Epub 2021 Jun 17.

State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.

Perfobond rib (PBL) shear connectors, made up of the perforated steel plates with the penetrating rebars passing through the holes, are extensively adopted in steel-concrete composite structures for their excellent performance. The adequate understanding of mechanical properties for PBL connectors is of great significance for their reasonable design. In this study, a push out experiment, including 12 specimens with the parameters of concrete strength, diameter of penetrating rebars and the number of holes on perforated steel plate, was performed to explore the mechanical behavior of PBL connectors with steel fiber high strength concrete (SFHSC). Read More

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Thermo-Mechanical and Delamination Properties in Drilling GFRP Composites by Various Drill Angles.

Polymers (Basel) 2021 Jun 6;13(11). Epub 2021 Jun 6.

Mechanical Engineering Department, Faculty of Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah 22254-2265, Saudi Arabia.

This manuscript aims to study the effects of drilling factors on the thermal-mechanical properties and delamination experimentally during the drilling of glass fiber reinforced polymer (GFRP). Drilling studies were carried out using a CNC machine under dry cutting conditions by 6 mm diameter with different point angles of ∅ = 100°, 118°, and 140°. The drill spindle speed (400, 800, 1600 rpm), feed (0. Read More

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Simvastatin reverses the harmful effects of high fat diet on titanium rod osseointegration in ovariectomized rats.

J Bone Miner Metab 2021 Jun 29. Epub 2021 Jun 29.

Department of Orthopedics, The Fifth Affiliated Hospital Lishui Municipal Central Hospital, Wenzhou Medical University, Lishui, Zhejiang, People's Republic of China.

Introduction: The objectives of the present study were to determine whether simvastatin (SIM) could reverse the harmful effects on titanium rod osseointegration in ovariectomized rats fed high-fat diet (HFD).

Materials And Methods: Ovariectomized female Sprague-Dawley rats were randomly allocated to three groups and received SIM treatment plus HFD for 12 weeks. We then evaluated the microstructure parameters, histological parameters, biomechanical parameters, bone turnover, and blood lipid level. Read More

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Effect of post-space irrigation with acid solutions on bond strength and dentin penetrability using a self-adhesive cementation system.

J Clin Exp Dent 2021 Jun 1;13(6):e564-e571. Epub 2021 Jun 1.

Department of Restorative Dentistry, Araraquara School of Dentistry, São Paulo State University (UNESP), Araraquara, SP, Brazil.

Background: The aim of this study was to evaluate the effects of surface treatments with 1% peracetic acid (PA), solution containing 17% EDTA (SmearClear, Kerr Endodontics), solution containing a combination of 17% EDTA with 2% chlorhexidine (QMix, Dentsply Sirona) on the post-space root dentin compared to 2.5% sodium hypochlorite (NaOCl) on bond strength and resin tags length in dentin.

Material And Methods: Forty human-canine roots were endodontically treated and the post space was prepared. Read More

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