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Operative Dentistry

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https://www.readbyqxmd.com/read/28605612/influence-of-different-curing-modes-on-polymerization-behavior-and-mechanical-properties-of-dual-cured-provisional-resins
#1
S Shibasaki, T Takamizawa, T Suzuki, K Nojiri, A Tsujimoto, W W Barkmeier, M A Latta, M Miyazaki
This study determined the influence of curing mode on polymerization behavior and mechanical properties of dual-cured provisional resins. Three dual-cured bisacryl-based provisional resins were used: Tempsmart (TS; GC Corp), Luxatemp Automix Solar (LX; DMG Chemisch Pharmazeutishe Fabrik GmbH), and Integrity Multi·Cure (IG; Dentsply Caulk). A self-cured bisacryl-based provisional resin, Protemp Plus (PP; 3M ESPE) and a conventional poly(methyl methacrylate) (PMMA) provisional resin, Unifast III (UF; GC Corp) were used as controls...
June 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28605611/short-and-long-term-bond-strength-between-resin-cement-and-glass-ceramic-using-a-silane-containing-universal-adhesive
#2
F Murillo-Gómez, F A Rueggeberg, M F De Goes
This study aimed to evaluate the effect of various silane-containing solutions on bonding between resin cement and glass ceramic after 24 hours and after six months of water storage. Glass-ceramic plaques (IPS e.max CAD) were sandblasted with aluminum oxide, etched with 10% hydrofluoric acid (HF), and divided into five "silane treatment" groups: RelyX Ceramic Primer (RCP), RelyX Ceramic Primer and Single Bond Plus (RCP+SB), Scotchbond Universal (SBU), Clearfil Ceramic Primer (CP), and no solution (HF-only control)...
June 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28605610/effect-of-light-curing-exposure-time-shade-and-thickness-on-the-depth-of-cure-of-bulk-fill-composites
#3
A Rodriguez, P Yaman, J Dennison, D Garcia
PURPOSE:   To investigate the effect of different light exposure times, shades, and thicknesses on the depth of cure (DOC) of bulk fill composites. METHODS AND MATERIALS:   Two bulk fill composites, Tetric EvoCeram Bulk Fill (TBF) and Sonic Fill (SF), and a conventional composite, Filtek Supreme Ultra (FSU), were evaluated. Samples (n=10) were made using two different shades (light and dark), thicknesses (2 and 4 mm) and exposure times (20 and 40 seconds). A Tukon 2100B-testing machine was used to obtain three Knoop hardness numbers (KHNs) measured at the top and bottom of each sample, and DOC was calculated as the bottom/top ratio...
June 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28581920/randomized-clinical-trial-to-evaluate-mta-indirect-pulp-capping-in-deep-caries-lesions-after-24-months
#4
U Koc Vural, A Kiremitci, S Gokalp
OBJECTIVE: This clinical study aimed to assess the efficacies of mineral trioxide aggregate (MTA) and calcium hydroxide [Ca(OH)2] in the treatment of deep carious lesions by the direct complete caries removal technique. METHODS AND MATERIALS: A total of 100 permanent molar/premolar teeth were capped with either Ca(OH)2 (n=49) or MTA (n=51) and restored with composite resin in 73 patients. Periapical radiographs were acquired prior to the treatment as well as at six, 12, and 24 months posttreatment...
June 5, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28581919/thirty-six-month-clinical-comparison-of-bulk-fill-and-nanofill-composite-restorations
#5
A R Yazici, S A Antonson, Z B Kutuk, E Ergin
OBJECTIVES: The aim of this study was to evaluate the clinical performance of a nanofill and a bulk fill resin composite in class II restorations. METHODS AND MATERIALS: In accordance with a split-mouth design, 50 patients received at least one pair of restorations, restored with a nanofill resin composite (Filtek Ultimate [FU]) and with a bulk fill resin composite (Tetric EvoCeram Bulk Fill [TB]). Each restorative resin was used with its respective adhesive system according to the manufacturers' instructions...
June 5, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28581918/battery-charge-affects-the-stability-of-light-intensity-from-light-emitting-diode-light-curing-units
#6
A Tongtaksin, C Leevailoj
This study investigated the influence of battery charge levels on the stability of light-emitting diode (LED) curing-light intensity by measuring the intensity from fully charged through fully discharged batteries. The microhardness of resin composites polymerized by the light-curing units at various battery charge levels was measured. The light intensities of seven fully charged battery LED light-curing units-1) LY-A180, 2) Bluephase, 3) Woodpecker, 4) Demi Plus, 5) Saab II, 6) Elipar S10, and 7) MiniLED-were measured with a radiometer (Kerr) after every 10 uses (20 seconds per use) until the battery was discharged...
June 5, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28581917/influence-of-emission-spectrum-and-irradiance-on-light-curing-of-resin-based-composites
#7
Cak Shimokawa, B Sullivan, M L Turbino, C J Soares, R B Price
PURPOSE: This study examined the influence of different emission spectra (single-peak and broad-spectrum) light-curing units (LCUs) delivering the same radiant exposures at irradiance values of 1200 or 3600 mW/cm(2) on the polymerization and light transmission of four resin-based composites (RBCs). METHODS AND MATERIALS: Two prototype LCUs that used the same light tip, but were either a single-peak blue or a broad-spectrum LED, were used to deliver the same radiant exposures to the top surfaces of the RBCs using either standard (1200 mW/cm(2)) or high irradiance (3600 mW/cm(2)) settings...
June 5, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402738/ferrule-effect-dominates-over-use-of-a-fiber-post-when-restoring-endodontically-treated-incisors-an-in-vitro-study
#8
P Magne, P C Lazari, M A Carvalho, T Johnson, A A Del Bel Cury
OBJECTIVES: The aim of this study was to investigate the restoration of broken-down endodontically treated incisors with the ferrule effect using glass ceramic crowns bonded to composite resin core buildups with or without a fiber post. A no-ferrule group with post was also included for comparison. METHODS AND MATERIALS: Thirty decoronated endodontically treated bovine incisors with a 2-mm ferrule were restored with a direct buildup using a nanohybrid direct composite resin (Miris 2 and Optibond FL) with or without a glass-fiber-reinforced post...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402737/comparison-of-polymerization-shrinkage-physical-properties-and-marginal-adaptation-of-flowable-and-restorative-bulk-fill-resin-based-composites
#9
J H Jung, S H Park
PURPOSE: The purpose of this study was to compare the marginal adaptation of two flowable bulk fill resin-based composites (FB-RBCs), two restorative bulk fill resin-based composites (RB-RBCs), and one regular incremental-fill RBC in MOD cavities in vitro. Additionally, the influence of linear polymerization shrinkage, shrinkage force, flexural modulus, and bottom/top surface hardness ratio on the marginal adaptation was evaluated. METHODS: A Class II MOD cavity was prepared in 40 extracted sound lower molars...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402736/characterization-of-a-diamond-ground-y-tzp-and-reversion-of-the-tetragonal-to-monoclinic-transformation
#10
L M Candido, Lmg Fais, E B Ferreira, S G Antonio, Lap Pinelli
PURPOSE: To characterize the surface of an yttria-stabilized zirconia (Y-TZP) ceramic after diamond grinding in terms of its crystalline phase, morphology, mean roughness (Ra), and wettability as well as to determine a thermal treatment to reverse the resulting tetragonal to monoclinic (t-m) transformation. METHODS AND MATERIALS: Y-TZP specimens were distributed into different groups according to the actions (or no action) of grinding and irrigation. Grinding was accomplished using a diamond stone at a low speed...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402735/microhardness-and-roughness-of-infiltrated-white-spot-lesions-submitted-to-different-challenges
#11
É Y Neres, M D Moda, E K Chiba, Alf Briso, J P Pessan, T C Fagundes
A white spot lesion is the first clinical sign of a caries lesion and represents mineral loss from the enamel subsurface. The purpose of this study was to evaluate the microhardness and surface roughness of white spot lesions after application of a resin infiltrant and subjection to different challenges. Caries-like lesions were induced in bovine enamel discs (n=50), and the specimens were randomly divided into five study groups (n=10): demineralized enamel (negative control, G1), infiltrated enamel (G2), infiltrated enamel submitted to brushing (G3), infiltrated enamel submitted to pH cycling (G4), and infiltrated enamel submitted to artificial aging (G5)...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402734/masking-colored-substrates-using-monolithic-and-bilayer-cad-cam-ceramic-structures
#12
G R Basso, A B Kodama, A H Pimentel, M R Kaizer, A Della Bona, R R Moraes, N Boscato
OBJECTIVE: To evaluate the masking ability and translucency of monolithic and bilayer CAD-CAM ceramic structures. METHODS: Discs of high translucency (HT) and low translucency (LT) lithium disilicate-based ceramic (IPS e.max CAD) with different thicknesses (0.7, 1, 1.5, and 2 mm) were evaluated as a monolithic structure or combined (bilayer) with a 0.5-mm-thick zirconia framework (IPS e.max ZirCAD). The masking ability and translucency were calculated based on CIE L*a*b* color coordinates measured with a spectrophotometer (SP60, X-Rite)...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402733/effect-of-surface-treatment-silane-and-universal-adhesive-on-microshear-bond-strength-of-nanofilled-composite-repairs
#13
I A Fornazari, I Wille, E M Meda, R T Brum, E M Souza
PURPOSE: The aim of this study was to evaluate the effect of surface treatment and universal adhesive on the microshear bond strength of nanoparticle composite repairs. METHODS: One hundred and forty-four specimens were built with a nanofilled composite (Filtek Supreme Ultra, 3M ESPE). The surfaces of all the specimens were polished with SiC paper and stored in distilled water at 37°C for 14 days. Half of the specimens were then air abraded with Al2O3 particles and cleaned with phosphoric acid...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402732/different-methods-for-inlay-production-effect-on-internal-and-marginal-adaptation-adjustment-time-and-contact-point
#14
M P Rippe, C Monaco, L Volpe, M A Bottino, R Scotti, L F Valandro
The aim of this study was to evaluate the effect of different production methods of resin and ceramic inlays on marginal and internal adaptation, adjustment time, and proximal contacts. Forty premolars were selected, embedded (their roots), and prepared to receive inlays that were made as follows (n=10): LaRe-digital impression with a Lava C.O.S. scanner, followed by milling of Lava Ultimate block (composite resin) in a milling center; CeRe-digital impression with a Cerec 3D Bluecam scanner, followed by milling of Lava Ultimate block in Cerec; CeDis-digital impression with a Cerec 3D Bluecam scanner, followed by milling of IPS e...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402731/characterization-of-inorganic-filler-content-mechanical-properties-and-light-transmission-of-bulk-fill-resin-composites
#15
B M Fronza, Apa Ayres, R R Pacheco, F A Rueggeberg, Cts Dias, M Giannini
OBJECTIVES: The aims of this study were to characterize inorganic content (IC), light transmission (LT), biaxial flexural strength (BFS), and flexural modulus (FM) of one conventional (layered) and four bulk-fill composites at different depths. METHODS: Bulk-fill composites tested were Surefil SDR flow (SDR), Filtek Bulk Fill (FBF), Tetric EvoCeram Bulk Fill (TEC), and EverX Posterior (EXP). Herculite Classic (HER) was used as a control. Energy dispersive x-ray analysis and scanning electron microscopy were used to characterize filler particle composition and morphology...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402730/light-emitting-diode-beam-profile-and-spectral-output-influence-on-the-degree-of-conversion-of-bulk-fill-composites
#16
M G Rocha, Dcrs de Oliveira, I C Correa, L Correr-Sobrinho, Mac Sinhoreti, J L Ferracane, A B Correr
OBJECTIVES: To evaluate the beam profile and the spectral output of monowave and polywave light-emitting diodes (LEDs) and their influence on the degree of conversion (DC) of bulk fill composites. METHODS: A monowave LED (Smartlite Focus, Dentsply) and a polywave LED (Valo Cordless, Ultradent) were characterized using a resin calibrator and a laser beam profile analyzer. Two bulk fill composites, Sonic Fill 2 (SF) containing camphorquinone (CQ) and Tetric EvoCeram Bulk Fill (TEB) containing CQ associated with alternative photoinitiators, were placed in custom-designed molds (n=3) and photoactivated by the monowave or polywave LED with 20 J/cm(2)...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28467265/bonding-polycrystalline-zirconia-with-10-mdp-containing-adhesives
#17
A E Llerena-Icochea, R M Costa, Afs Borges, Jfs Bombonatti, A Y Furuse
OBJECTIVE: The objective of this study was to evaluate the influence of adhesives with different 10-MDP concentrations on the shear bond strength of a resin cement to zirconia. METHODS AND MATERIALS: Six experimental adhesives were prepared with the following composition: camphorquinone, 1,2-diaminobenzene, butylhydroxytoluene, diphenyliodonium hexafluorophosphate, 2-hydroxyethyl methacrylate triethylene glycol dimethacrylate, ethoxylated bisphenol A glycol dimethacrylate, urethane dimethacrylate, bisphenol A diglycidyl methacrylate, and ethanol...
May 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28467263/errata
#18
(no author information available yet)
No abstract text is available yet for this article.
May 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28467262/comparison-of-effectiveness-and-sensitivity-using-two-in-office-bleaching-protocols-for-a-6-hydrogen-peroxide-gel-in-a-randomized-clinical-trial
#19
P Vildósola, F Vera, J Ramírez, J Rencoret, H Pretel, O B Oliveira, M Tonetto, J Martín, E Fernández
OBJECTIVE: The aim of this blinded and randomized clinical trial was to compare two application protocols (one 36-minute application vs three 12-minute applications). We then assessed the effectiveness of the bleaching and any increase in sensitivity that was induced by bleaching via a split-mouth design. METHODS AND MATERIALS: Thirty patients were treated. One group had a half arch of teeth treated with a traditional application protocol (group A: 3 × 12 minutes for two sessions)...
May 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28467261/stress-reduced-direct-composites-for-the-restoration-of-structurally-compromised-teeth-fiber-design-according-to-the-wallpapering-technique
#20
S Deliperi, D Alleman, D Rudo
PURPOSE: The purpose of this work was to present a restoration technique based on an understanding of the biomechanical properties of the dentinoenamel complex (DEC) and the physical-mechanical properties of the resin-based composite including the stress generated from both polymerization shrinkage and occlusal forces. Technique Summary: The DEC is a functional interphase that provides crack tip shielding; the DEC should be preserved during restorative procedures. Dentists can design the strategic placement of restorative materials into the cavity to both resist the mode of failure and mimic the performance characteristics of the intact natural tooth...
May 2017: Operative Dentistry
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