Radiographic detection of overhangs formed by resin composite luting agents

The purpose of this study was to evaluate and compare the retention strength of five cement types commonly used in implant-retained fixed partial dentures, before and after compressive cyclic loading. In five solid abutments screwed to 5 implant analogs, 50 metal Cr-Ni alloy copings were cemented with five luting agents: resin-modified glass ionomer (RmGI), resin composite (RC), glass ionomer (GI), resin urethane-based (RUB), and compomer cement (CC). Two tensile tests were conducted with a universal testing machine, one after the first luting of the copings and the other after 100,000 cycles of 100 N loading at 0.72 Hz. The one way ANOVA test was applied for the statistical analysis using the post hoc Tukey test when required. Before and after applying the compressive load, RmGI and RC cement types showed the greatest retention strength. After compressive loading, RUB cement showed the highest percentage loss of retention (64.45%). GI cement recorded the lowest retention strength (50.35 N) and the resin composite cement recorded the highest (352.02 N). The type of cement influences the retention loss. The clinician should give preference to lower retention strength cement (RUB, CC, and GI) if he envisages any complications and a high retention strength one (RmGI, RC) for a specific clinical situation.

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The Effect of Luting Agents and Ceramic Thickness on the Color Variation of Different Ceramics against a Chromatic Background

European Journal of Dentistry ◽

10.1055/s-0039-1698888 ◽

2011 ◽

Vol 05 (03) ◽

pp. 245-252 ◽

Cited By ~ 29

Author(s):

Gloria Beatriz de Azevedo Cubas ◽

Guilherme Brião Camacho ◽

Flávio Fernando Demarco ◽

Tatiana Pereira-Cenci

Keyword(s):

Resin Composite ◽

Color Variation ◽

Control Group ◽

B Values ◽

Luting Agents ◽

Luting Agent ◽

Color Differences ◽

Colored Background ◽

Post Hoc ◽

Ceramic Thickness

ABSTRACTObjectives: The aim of this study was to assess the influence of various ceramic thicknesses and luting agents on color variation in five ceramic systems. Methods: Fifteen disc-shaped ceramic specimens (11 mm diameter; shade A3) were fabricated with each of the six veneering ceramics tested, with 1, 1.5, or 2 mm thickness (n=5). Resin composite discs (Z-250, shade C4) were used as bases to simulate a chromatic background. The cementation of the veneers was carried out with an opaque resin-based cement (Enforce, shade C4), a resin-based cement (Enforce, shade A3), or without cement (C4, control group). Color differences (ΔE*) were determined using a colorimeter. Three-way ANOVA was used to analyze the data, followed by a Tukey post-hoc test (α=.05). Results: The L*a*b* values of the ceramic systems were affected by both the luting agent and the ceramic thickness (P<.05). In general, there was no difference between the control group and the group using the resin-based cement. The use of an opaque luting agent resulted in an increase of the color coordinates a*, b*, L*, producing differences in ΔE* values for all ceramics tested, regardless of the thickness (P<.05). For the 2-mm thick veneers, higher values in the color parameters were obtained for all ceramics and were independent of the luting agent used. Conclusions: The association of 2-mm thickness with opaque cement presented the strongest masking ability of a dark colored background when compared to a non-opaque Lutinging agent and the other thicknesses tested. (Eur J Dent 2011;5:245-252)

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Retentive Force of Three Fiber-reinforced Resin Composite Posts and a Zirconia Post Cemented with Two Adhesive Luting Agents: In Vitro Study

Dental Materials Journal ◽

10.4012/dmj.26.672 ◽

2007 ◽

Vol 26 (5) ◽

pp. 672-676 ◽

Cited By ~ 4

Author(s):

Zelal SEYFIOGLU POLAT ◽

Ibrahim Halil TACIR ◽

Sebnem ESKIMEZ ◽

M. Yusuf ÇELIK

Keyword(s):

Resin Composite ◽

In Vitro Study ◽

Vitro Study ◽

Fiber Reinforced ◽

Retentive Force ◽

Luting Agents ◽

Adhesive Luting

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Effect of Water Storage on Hardness and Interfacial Strength of Resin Composite Luting Agents Bonded to Surface-Treated Monolithic Zirconia

Dentistry Journal ◽

10.3390/dj9070078 ◽

2021 ◽

Vol 9 (7) ◽

pp. 78

Author(s):

Emmanouil-George Tzanakakis ◽

Maria Dimitriadi ◽

Ioannis Tzoutzas ◽

Petros Koidis ◽

Spiros Zinelis ◽

...

Keyword(s):

Surface Treatment ◽

Resin Composite ◽

Water Storage ◽

Interfacial Strength ◽

Roughness Parameters ◽

Shear Strength Test ◽

Effect Of Water ◽

Luting Agents ◽

Significant Difference ◽

Monolithic Zirconia

Background: Durable bonding between resin composite luting agents (CLA) and zirconia is still a matter of controversy. The purpose of this study was to evaluate the effect of water storage on hardness and interfacial strength of three CLA, a non-adhesive (Multilink Automix/ML), an adhesive (Panavia F 2.0/PF) and a self-adhesive (PermaCem 2.0/PC), bonded to polished (CL) and grit-blasted (AL: 50 μm alumina, SJ: Sil-Jet + Monobond Plus silane) monolithic zirconia surfaces. Methods: CLA specimens (n = 5/cement, condition) were prepared, stored under dry conditions or immersed in water, and Vickers hardness (VH) measurements were obtained at 1 h, 24 h, 1 week and 3 weeks intervals. Optical profilometry was used to determine the roughness parameters (Sa, Sz, Sdr, Sci) of zirconia surfaces (n = 5/treatment). A shear strength test (SBS, n = 10 × 2/cement) was performed to assess the strength and fractography of the cements bonded to zirconia after isothermal water storage and thermal-cycling (TC). Results: PF demonstrated significantly lower VHN after water storage at all time intervals, PC at 1 w, 3 w and ML at 3 w. SJ and AL showed significantly higher values from CL in all roughness parameters. Weibull analysis revealed the following significance in σο ranking within the same material: AL, SJ, ALTC > SJTC, CL > CLTC (PF); SJ, SJTC, AL, ALTC > CL, CLTC (PC) and SJ, SJTC > AL > ALTC > CL, CLTC (ML). Within the same surface treatment subgroups, the significance in σo ranking was PC, ML > PF (before/after TC) for SJ; PC > PF > ML (before TC), PC, PF > ML (after TC) for AL, and PC > PF > ML (before/after TC) for CL. For the m ranking, the only significant difference within each material group was found in PC (AL > ALTC) and for the same surface treatment in AL (PC > ML). Conclusion: There are significant differences in the water plasticization susceptibility of the CLA tested; the materials with adhesive monomers were the most affected. Tribo-chemical silica coating combined with a silane coupling agent was the most efficient bonding treatment for the non-adhesive and the self-adhesive materials. The adhesive CLA performed better on alumina-blasted than on tribo-chemically coated surfaces.

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Bond Durability of Composite Luting Agents to Ceramic When Exposed to Long-term Thermocycling

Operative Dentistry ◽

10.2341/06-106 ◽

2007 ◽

Vol 32 (4) ◽

pp. 372-379 ◽

Cited By ~ 21

Author(s):

M. Peumans ◽

K. Hikita ◽

J. De Munck ◽

K. Van Landuyt ◽

A. Poitevin ◽

...

Keyword(s):

Chemical Composition ◽

Surface Treatment ◽

Clinical Relevance ◽

Resin Composite ◽

Ceramic Surface ◽

Luting Agents ◽

Luting Cement ◽

Cad Cam ◽

Composite Cements

Clinical Relevance Depending on the ceramic surface treatment and chemical composition of the luting cement, there is a varying degree of bonding effectiveness of resin composite cements to CAD-CAM ceramic after thermocycling.

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The Effect of Different Adhesive Types and Curing Methods on Microleakage and the Marginal Adaptation of Composite Veneers

The Journal of Contemporary Dental Practice ◽

10.5005/jcdp-10-3-18 ◽

2009 ◽

Vol 10 (3) ◽

pp. 18-26 ◽

Cited By ~ 3

Author(s):

Horieh Moosavi ◽

Fathemeh Maleknejad ◽

Nasrin Sarabi ◽

Resa Shahriari ◽

Taybeh Shayankhah

Keyword(s):

Resin Composite ◽

Resin Cement ◽

Marginal Adaptation ◽

Luting Agents ◽

Bonding System ◽

Halogen Light ◽

Two Samples ◽

Significant Difference ◽

Curing Methods ◽

Indirect Composite

Abstract Aim The aim of this in vitro study was to evaluate the influence of application techniques (with pre-curing vs without pre-curing) for dentin adhesive on microleakage and marginal adaptation of indirect composite veneer restorations. Methods and Materials A total-etch bonding system, Excite/Variolink II (EXV), and a self-etching primer system, Panavia F2.0 (PF2), were used in the study. Forty-eight human central incisors were prepared for composite veneer restorations. The teeth were divided into two groups (n=24). For each resin cement, one half of each experimental group included an adhesive pre-cure (PC) with a halogen light source while the other half received no pre-cure (NPC) prior to resin cement insertion. Thus, four experimental groups were created: A (PC+EXV), B (NPC+EXV), C (PC+PF2), and D (NPC+PF2). Veneers made of Tetric Ceram resin composite were cemented using dual-cured resin luting agents. After storage in distilled water at 37°C for 24 hours, the teeth were prepared for marginal leakage. Two samples of each group were selected at random for scanning electron microscopic (SEM) observation and evaluation of marginal adaptation at 1050x magnification. Data were analyzed using the Kruskal-Wallis and Mann-Whitney tests (Ð <0.05). Results The highest and lowest microleakage values were observed in dentinal margins of groups B and A, respectively. Dentin margins opposite to enamel margins had a significant difference in microleakage values of PC and NPC groups (P<0.05). The influence of the adhesive pre-cure was more pronounced than the type of resin cement used. No adhesive layer was visualized for the adhesives used without employing the pre-curing step. Conclusion The effect of pre-cured adhesives was not material specific. The pre-cured adhesives showed the best resistance to dye penetration although the film thickness of these luting agents was only slightly increased. Clinical Significance Different curing methods (with pre-curing/without pre-curing) regardless of total-etch or self-etch adhesive systems influenced microleakage and the marginal adaptation, especially dentin margins of indirect composite veneers. Citation Maleknejad F, Moosavi H, Shahriari R, Sarabi S, Shayankhah T. The Effect of Different Adhesive Types and Curing Methods on Microleakage and the Marginal Adaptation of Composite Veneers. J Contemp Dent Pract 2009 May; (10)3:018-026.

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Degree of Conversion and Mechanical Properties of Modern Self-Adhesive Luting Agents

Applied Sciences ◽

10.3390/app112412065 ◽

2021 ◽

Vol 11 (24) ◽

pp. 12065

Author(s):

Maria Dimitriadi ◽

Aikaterini Petropoulou ◽

Maria Zafiropoulou ◽

Spiros Zinelis ◽

George Eliades

Keyword(s):

Mechanical Properties ◽

Ftir Spectroscopy ◽

Resin Composite ◽

Storage Period ◽

Degree Of Conversion ◽

Superior Performance ◽

Indentation Modulus ◽

Luting Agents ◽

Adhesive Luting ◽

Dual Curing

New self-adhesive resin composite luting agents have currently been developed, claiming improved properties. The study aimed to evaluate the composition, degree of conversion, and mechanical properties of Panavia SA Plus (PSP), Panavia SA Universal (PSU), SpeedCem Plus (SPC) and TheraCem Ca (THC), with the resin luting agent Panavia V5 (PV5) serving as a control. The structure of the materials was studied by FTIR spectroscopy and SEM/EDX spectrometry. Disk-shaped specimens were prepared from each material under dual- and self-curing modes (n = 5/mode and material). After a 3-week storage period (dark/37 °C/80%RH) the Martens hardness, indentation modulus, elastic index, and creep were determined by instrumented indentation testing (IIT), while the degree of conversion was assessed by FTIR spectroscopy. Statistical analysis was performed by 2-way ANOVA and post-hoc testing (α = 0.05). All materials were based on aromatic monomers, except for SPC. Fillers with potentially bioactive Ca-glasses were identified in SPC and THC, which showed the highest P/Si ratio. The dual-curing mode demonstrated superior performance in all properties. Differences between materials within each curing mode were limited to SPC, THC (highest conversion) and PSA, PSU, SPC (highest elastic index) for dual-curing, and THC (lowest hardness and elastic index). The results confirmed a lower self-curing conversion in these materials, which may affect some of the mechanical properties tested.

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Silicification of wood-cell walls

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100169870 ◽

1994 ◽

Vol 52 ◽

pp. 428-429

Author(s):

S. E. Keckler ◽

D. M. Dabbs ◽

N. Yao ◽

I. A. Aksay

Keyword(s):

Electron Microscopy ◽

Cell Wall ◽

Cell Walls ◽

Lignin Content ◽

Resin Composite ◽

Middle Lamella ◽

Cellulose Fibers ◽

Complex Structures ◽

Rich Region ◽

Inorganic Precursors

Cellular organic structures such as wood can be used as scaffolds for the synthesis of complex structures of organic/ceramic nanocomposites. The wood cell is a fiber-reinforced resin composite of cellulose fibers in a lignin matrix. A single cell wall, containing several layers of different fiber orientations and lignin content, is separated from its neighboring wall by the middle lamella, a lignin-rich region. In order to achieve total mineralization, deposition on and in the cell wall must be achieved. Geological fossilization of wood occurs as permineralization (filling the void spaces with mineral) and petrifaction (mineralizing the cell wall as the organic component decays) through infiltration of wood with inorganics after growth. Conversely, living plants can incorporate inorganics into their cells and in some cases into the cell walls during growth. In a recent study, we mimicked geological fossilization by infiltrating inorganic precursors into wood cells in order to enhance the properties of wood. In the current work, we use electron microscopy to examine the structure of silica formed in the cell walls after infiltration of tetraethoxysilane (TEOS).

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