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Dental Composite Pre-heat

Yaming Wang, Guangxin Wang, Zhi Lu, Wuhui Li, Yanfu Yan, Yongfa Song, Osaka Akiyoshi
Titanium and its alloys are frequently employed in medical and dental clinics due to their good tissue compatibility, including commercially available pure Ti, Ti6A4V, or Ti-15Zr-4Ta-4Nb. Yet, they may behave very differently when in contact with our plasma because of their own chemical composition. The present study was designed to compare the in vitro behavior of highly pure Ti (>99.99%; hpTi) with those of the above titanium specimens when they were subjected to heating in air (HT), H₂O₂ and heating (CHT), and heating in air after forming grooves on the surface (GT)...
April 26, 2018: Materials
Narmin Mohammadi, Elmira Jafari-Navimipour, Soodabeh Kimyai, Amir-Ahmad Ajami, Mahmoud Bahari, Mohammad Ansarin, Mahsa Ansarin
BACKGROUND: The use of composites in dental restoration has been commonly criticized, due to their underwhelming mechanical properties. This problem may be solved partially by preheating. The present research aims to determine the effect of preheating on the mechanical properties of two different classes of composites. MATERIAL AND METHODS: A Silorane-based (Silorane) and a Methacrylate-based (Z250) composite were preheated to different temperatures (25, 37, and 68 °C) and afterwards were tested with the appropriate devices for each testing protocol...
October 2016: Journal of Clinical and Experimental Dentistry
Jessika Calixto da Silva, Reges Rogério Vieira, Inara Carneiro Costa Rege, Carlos Alberto dos Santos Cruz, Luís Geraldo Vaz, Carlos Estrela, Fabrício Luscino Alves de Castro
Dental composites cured at high temperatures show improved properties and higher degrees of conversion; however, there is no information available about the effect of pre-heating on material degradation. Objectives This study evaluated the effect of pre-heating on the degradation of composites, based on the analysis of radiopacity and silver penetration using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS). Material and Methods Thirty specimens were fabricated using a metallic matrix (2x8 mm) and the composites Durafill VS (Heraeus Kulzer), Z-250 (3M/ESPE), and Z-350 (3M/ESPE), cured at 25°C (no pre-heating) or 60°C (pre-heating)...
November 2015: Journal of Applied Oral Science: Revista FOB
Moustafa N Aboushelib, Donia Sleem
PURPOSE: To evaluate the influence of the internal structure of lithium disilicate glass ceramics (LDC) on the microtensile bond strength to a resin adhesive using two surface treatments. MATERIALS AND METHODS: Milling blocks of three types of LDC were sectioned (4 mm thick) using a precision cutting machine: IPS Empress 2 (conventional LDC), IPSe.max CAD (a refined crystal high strength LDC), and Celtra (zirconia reinforced LDC). Cut specimens received crystallization heat treatment as suggested by the manufacturers...
December 2014: Journal of Adhesive Dentistry
Caroline Cotes, Rodrigo Furtado de Carvalho, Estevão Tomomitsu Kimpara, Fabíola Pessoa Leite, Mutlu Ozcan
PURPOSE: To evaluate the influence of heat treatment (HT) procedures of a pre-hydrolyzed silane on bond strength of resin cement to a feldspathic ceramic. MATERIALS AND METHODS: Ceramic and composite blocks (N = 30) were divided into six groups (n = 5) and subjected to the following conditioning procedures: G1: 9.6% hydrofluoric acid (HF) for 20 s + silane (RelyX Ceramic Primer, 3M ESPE) + resin cement (Panavia F2.0, Kuraray) (control); G2: HF (20 s) + silane + heat treatment in furnace (HTF) (100°C, 2 min) + resin cement; G3: silane + HTF + resin cement; G4- HF (20 s) + silane + heat treatment with hot air (HTA) (50 ± 5°C for 1 min) + resin cement; G5: silane + HTA + resin cement; G6: silane + resin cement...
December 2013: Journal of Adhesive Dentistry
Pascal Magne, Luís L Boff, Elisa Oderich, Antônio C Cardoso
STATEMENT OF PROBLEM: Cracked teeth may traditionally require the use of complete coverage crowns. Alternative conservative treatments involve the use of adhesive inlays/onlays with the possibility of including a fiber patch to reinforce the cracked cusp. PURPOSE: The purpose of this study was to evaluate the fatigue strength of compromised molars restored with computer-aided-design/computer-assisted-manufactured (CAD/CAM) composite resin inlays/onlays with and without fiber-reinforced immediate dentin sealing (IDS)...
April 2012: Journal of Esthetic and Restorative Dentistry
Karlis A Gross, Dirk Muller, Helen Lucas, David R Haynes
Coating characteristics such as composition, crystallite features and topography collectively impact the cell response. The influence from splats has not yet been assessed for hydroxyapatite (HAp) thermal spray coatings. The objective of this work is to (a) survey the topography on commercial implants, (b) ascertain topography formation from single splats, and (c) determine the osteoclast resorption pattern on a topographically refined coating compared to dentine. Coatings on dental implants, an orthopedic screw, a femoral stem and a knee implant were studied for reference...
May 2012: Acta Biomaterialia
Flávio Álvares França, Michele de Oliveira, José Augusto Rodrigues, César Augusto Galvão Arrais
This study evaluated the degree of conversion (DC) and ultimate tensile strength (UTS) of dual-cured resin cements heated to 50º C prior to and during polymerization. Disc- and hourglass-shaped specimens of Rely X ARC (RX) and Variolink II (VII) were obtained using addition silicon molds. The products were manipulated at 25º C or 50º C and were subjected to 3 curing conditions: light-activation through a glass slide or through a pre-cured 2-mm thick resin composite disc, or they were allowed to self-cure (SC)...
March 2011: Brazilian Oral Research
Serena Incerti Parenti, Stefano Guicciardi, Cesare Melandri, Simone Sprio, Elena Lafratta, Anna Tampieri, Giulio Alessandri Bonetti
OBJECTIVE: The purpose of this study was to evaluate the effect of three popular soft drinks on the Young's modulus, hardness, surface topography and chemical composition of widely used nickel-titanium-based orthodontic wires. MATERIALS AND METHODS: Thirty-two specimens (20 mm in length) were cut from the straight portion of pre-formed 0.019 × 0.025 inch Nitinol Heat-Activated archwires and randomly divided into four groups of eight specimens each: Group A1 (Coca Cola(®) regular); Group A2 (Santal(®) orange juice); Group A3 (Gatorade(®)); Group B (distilled, deionized water; dH(2)O)...
January 2012: Acta Odontologica Scandinavica
Camila Sabatini, Uwe Blunck, Gerald Denehy, Carlos Munoz
PURPOSE: To evaluate the effect of preheated composites (PHC) and flowable liners (FL) on the gingival margin gap formation of Class II composite restorations compared to the placement of room temperature composites (RTC). MATERIALS AND METHODS: Class II composite restorations were prepared on 40 extracted mandibular third molars, with the gingival margin located 1 mm below the CEJ in dentin. Optibond FL (Kerr), microhybrid Filtek Z-250 (3M ESPE) and Flow-It (Jeneric Pentron) were used to evaluate five study groups: 1) PHC, 130 degrees F/54...
November 2010: Operative Dentistry
Sanjukta Deb, Lucy Di Silvio, Harrison E Mackler, Brian J Millar
OBJECTIVES: Cavity lining with flowable composites have been proposed to improve initial marginal adaptation and minimize shrinkage stresses. The purpose of this study was to evaluate if prewarming of composites would influence the flow and enhance marginal adaptation thus the effect of pre-warming different types of composites on their properties are reported. METHODS: Six different composites were used in this study including a flowable and a polyacid modified composite...
April 2011: Dental Materials: Official Publication of the Academy of Dental Materials
Pascal Magne, Maria Paula Gandolfi Paranhos, Luiz Henrique Burnett, Michel Magne, Urs Christoph Belser
OBJECTIVES: This study assessed the fatigue resistance and failure mode of type III porcelain and composite resin veneers bonded to custom zirconia implant abutments. MATERIAL AND METHODS: Twenty-four standardized zirconia implant abutments were fabricated. Using the CEREC 3 machine, type III veneers of standardized shape were milled in ceramic Vita Mark II or in composite resin Paradigm MZ100. The intaglio surfaces of the restorations were hydrofluoric acid etched and silanated (Mark II) or airborne-particle abraded and silanated (MZ100)...
February 2011: Clinical Oral Implants Research
Nívea Regina Fróes-Salgado, Luciana Maria Silva, Yoshio Kawano, Carlos Francci, Alessandra Reis, Alessandro D Loguercio
OBJECTIVES: This study evaluated the effect of composite pre-polymerization temperature and energy density on the marginal adaptation (MA), degree of conversion (DC), flexural strength (FS), and polymer cross-linking (PCL) of a resin composite (Filtek Z350, 3M/ESPE). METHODS: For MA, class V cavities (4 mm x 2 mm x 2 mm) were prepared in 40 bovine incisors. The adhesive system Adper Single Bond 2 (3M/ESPE) was applied. Before being placed in the cavities, the resin composite was either kept at room-temperature (25 degrees C) or previously pre-heated to 68 degrees C in the Calset device (AdDent Inc...
September 2010: Dental Materials: Official Publication of the Academy of Dental Materials
S Lucey, C D Lynch, N J Ray, F M Burke, A Hannigan
The effect of pre-heating resin composite on pre-cured viscosity and post-cured surface hardness was evaluated. Groups of uncured specimens were heated to 60 degrees C and compared with control groups (24 degrees C) with respect to viscosity and surface hardness. Mean (SD) viscosities of the pre-heated specimens (n = 15) were in the range of 285 (13)-377 (11) (Pa) compared with 642 (35)-800 (23) (Pa) at ambient temperature. There was a statistically significant difference between the two groups (P < 0.001)...
April 2010: Journal of Oral Rehabilitation
Juliana da Costa, Rose McPharlin, Thomas Hilton, Jack Ferracane
PURPOSE: This study compared the flowability of various commercial dental composites to flowable composites in response to warming in a composite warmer. METHODS: 18 conventional resin composites and four flowable composites were tested at room temperature (23 degrees C), and the conventional composites were tested after pre-heating in a Calset unit (Addent) to 54 degrees C or 68 degrees C. Flowability was determined by placing uncured composite onto plastic sheets and loading for 180 seconds (4 kg load) while maintained at 36 degrees C (conditioning temperature [n=3]) to simulate placing room temperature composite into a tooth...
April 2009: American Journal of Dentistry
Amerigo Cantoro, Cecilia Goracci, Carlos Augusto Carvalho, Ivanovic Coniglio, Marco Ferrari
OBJECTIVES: To assess whether the bonding potential to dentin of self-adhesive resin cements was affected by their pre-cure temperature. METHODS: Composite overlays (Paradigm MZ100, 3M ESPE) were luted on 100 extracted molars with G-Cem (GC Corp.), BisCem (Bisco), Multilink Sprint (Ivoclar Vivadent), SAC-A (Kuraray Co.), XP Bond/Calibra (Detrey Dentsply). The cements were used at pre-cure temperatures that recur in their handling (4 degrees C refrigerator, 24 degrees C room and 37 degrees C intraoral), as well as following pre-heating up to 60 degrees C...
June 2009: Journal of Dentistry
M B Shah, J L Ferracane, J J Kruzic
OBJECTIVES: To test the hypothesis that the fracture resistance of two different particulate resin composites degrade after water hydration and improve after post-cure heat treatment, and to correlate those changes with salient failure micromechanisms. METHODS: Two composites with different filler morphology were selected, denoted microhybrid (Filtek Z250) and nanofill (Filtek Supreme plus). Following initial light curing, hydrated samples were aged in water for 60 days at room temperature while post-cured samples were heat treated at 120 degrees C for 90 min...
June 2009: Dental Materials: Official Publication of the Academy of Dental Materials
Ulrich Lohbauer, Spiros Zinelis, Christos Rahiotis, Anselm Petschelt, George Eliades
OBJECTIVES: To determine monomer conversion and polymerization shrinkage of a resin composite after different pre-heating procedures and storage intervals. METHODS: For a commercial resin-based composite the immediate (5 min) and final (24h) degree of conversion was measured on top and bottom surfaces utilizing FTIR spectroscopy. Composite pre-heating temperatures were selected between 10 and 68 degrees C. Polymerization shrinkage was measured according to Archimedes' principles of buoyancy after 5 min at respective pre-heating temperatures and after 24h dark and wet storage at 37 degrees C...
April 2009: Dental Materials: Official Publication of the Academy of Dental Materials
Luiz E Bertassoni, Grayson W Marshall, Evelise Machado de Souza, Rodrigo Nunes Rached
STATEMENT OF PROBLEM: Impregnated fibers require light polymerization; however, little information exists about how different protocols might affect the mechanical properties of reinforced denture base materials. PURPOSE: The purpose of this study was to compare the effects of pre- or postpolymerization of preimpregnated fibers on the flexural strength and elastic modulus of a reinforced autopolymerized and a heat-polymerized acrylic resin. MATERIAL AND METHODS: Seventy-two specimens were divided into 12 treatment groups (n=6), according to type of acrylic resin (autopolymerized or heat polymerized), type of reinforcement, and its pre- or postpolymerization...
December 2008: Journal of Prosthetic Dentistry
Carlos A Muñoz, Peter R Bond, Jenny Sy-Muñoz, Daniel Tan, John Peterson
PURPOSE: To evaluate the depth of cure and surface hardness of two resin composites when subjected to three preheating temperatures, three polymerization times and two types of curing lights. METHODS: Two resin composites were used in this study (Esthet-X and TPH), three polymerization times (10, 20, 40 seconds), three preheating temperatures (70, 100, 140 degrees F/21.1, 37.7 and 60 degrees C), and two curing lights (halogen and LED). For depth of cure measurements, 180 specimens (4 mm in diameter and 2 mm in depth) were made for 36 combinations of variables...
August 2008: American Journal of Dentistry
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