Influence of Thermal Stress on Simulated Localized and Generalized Wear of Nanofilled Resin Composites

Tsujimoto, Akimasa; Barkmeier, Wayne W.; Takamizawa, Toshiki; Latta, Mark; Miyazaki, Masashi

doi:10.2341/16-206-l

Cited by 15 publications

(13 citation statements)

References 28 publications

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“…After placement of the repair composite, additional thermal cycling was performed to assess the long-term stability. As opposed to water storage (aging due to water uptake only), thermocycling simulates hydrothermal aging with temperature changes resulting in repetitive contraction-expansion stresses (24,28). The number of cycles used (10,000 cycles) might correspond to approximately one year of clinical service (29).…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of a universal adhesive for repair bonding to composite and amalgam

et al. 2019

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The study aimed to compare the repair bond strength of aged composite and amalgam repaired with resin composite after various mechanical and adhesive surface treatments. Specimens were aged by thermal cycling (10,000 cycles, 5-55°C) and randomly subjected to one of three surface treatments: diamond bur abrasion, aluminum oxide air abrasion, or silica coating. Conventional bonding or a universal adhesive with incorporated silane was applied afterward (each n = 16) and resin composite was attached. In the control groups (each n = 16), resin composite was attached using one of the above adhesives without prior mechanical surface conditioning. After further thermal cycling, the shear bond strength (SBS) and failure modes were assessed. Statistical analyses were performed using ANOVA, Weibull statistics, two sample t-tests, and Chi 2 -test (P < 0.05). The SBS of the repaired amalgam was significantly lower than that of the composite and mechanical pretreatment significantly increased SBS. The universal adhesive significantly improved the SBS of the repaired amalgam compared to the conventional bonding agent and mechanical pretreatment increased the number of cohesive/mixed failures. Amalgam restorations may be repaired using resin composites, but the resulting SBS is lower than that obtained with composite.

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Section: Discussionmentioning

confidence: 99%

Effectiveness of a universal adhesive for repair bonding to composite and amalgam

et al. 2019

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“…Similar to conventional types of DRCs, the quantity, type, size of the inorganic filler [7], and the silanization of the inorganic filler significantly influence the mechanical properties [8]. The mechanical properties of FRCs depend on two main variables: the type of organic matrix [9,10], which gives the mechanical properties of the organic part [11,12], and the inorganic filler [13], characterized by the type, size, and geometry [13,14]. Other factors that influence the mechanical behavior of FRCs are the silanization [8], factors affecting the polymerization efficiency [15,16], and the binding between the inorganic filler and the organic matrix [8,17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Filler Loading on the Mechanical Properties of Flowable Resin Composites

et al. 2020

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The aim of this study was to evaluate the correlation between the percent of inorganic filler by weight (wt. %) and by volume (vol. %) of 11 flowable resin composites (FRCs) and their mechanical properties. To establish the correlation, the quantity of inorganic filler was determined by combustion and shape/size analyzed by SEM images. The compressive strength (CS), flexural strength (FS), and flexural modulus (FM) were determined. The CS values were between 182.87-310.38 MPa, the FS values ranged between 59.59 and 96.95 MPa, and the FM values were between 2.34 and 6.23 GPa. The percentage of inorganic filler registered values situated between 52.25 and 69.64 wt. % and 35.35 and 53.50 vol. %. There was a very good correlation between CS, FS, and FM vs. the inorganic filler by wt. % and vol. %. (R2 = 0.8899–0.9483). The highest regression was obtained for the FM values vs. vol. %. SEM images of the tested FRCs showed hybrid inorganic filler for Filtek Supreme XT (A3) and StarFlow (A2) and a homogeneous type of inorganic filler for the other investigated materials. All of the FS values were above 50 MPa, the ISO 4049/2019 limit for FRCs.

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“…However, in this study, there was a clear relationship between wear resistance and average filler size of indirect composite resins. The complexity of wear resistance is further pointed out by another study22 in which newly developed conventional composite resins showed variations with same wear simulation that could not be explained purely in terms of filler particle size.…”

Section: Discussionmentioning

confidence: 95%

“…Thus, the wear characteristics of NX and GP appear to be close to those of Filtek P50. Tsujimoto et al22 also reported that the clinical wear rate of Filtek P50 was measured as 8.3 µm/year in 2004 and 2008 at the CU and 7.8 µm/year in 2004 at the Catholic University of Leuven School of Dentistry (CL). Therefore, combining the results of this study and previous studies, clinicians can predict the likely clinical wear rates of GP and SN (approximately < 10 µm/year) and understand that other indirect composite resins may have higher wear rates (> 10 µm/year).…”

Section: Discussionmentioning

confidence: 99%

Wear resistance of indirect composite resins used for provisional restorations supported by implants

et al. 2019

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PURPOSE The aim of this study was to investigate simulated localized and generalized wear of indirect composite resins used for implant supported provisional restorations. MATERIALS AND METHODS The study investigated ten indirect composite resins. Two kinds of wear were simulated by 400,000 cycles in a Leinfelder-Suzuki (Alabama) machine. Localized wear was simulated with a stainless-steel ball bearing antagonist and generalized with a flat-ended stainless-steel cylinder antagonist. The tests were carried out in water slurry of polymethyl methacrylate beads. Wear was measured using a Proscan 2100 noncontact profilometer in conjunction with Proscan and AnSur 3D software. RESULTS Both localized and generalized wear were significantly different ( P <.05) among the indirect composite resins. SR Nexco and Gradia Plus showed significantly less wear than the other indirect composite resins. The rank order of wear was same in both types of wear simulation. CONCLUSION Indirect composite resins are recommended when a provisional implant-supported restoration is required to function in place over a long period. Although only some indirect composite resins showed similar wear resistance to CAD/CAM composite resins, the wear resistance of all the indirect composite resins was higher than that of bis-acryl base provisional and polymethyl methacrylate resins.

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Influence of Thermal Stress on Simulated Localized and Generalized Wear of Nanofilled Resin Composites

Abstract: The simulated localized and generalized wear of nanofilled resin composites is material dependent. The simulated localized wear of nanofilled resin composites appears to be influenced by thermal stress, whereas this effect is not as apparent in simulated generalized wear testing.

Cited by 15 publications

References 28 publications

Effectiveness of a universal adhesive for repair bonding to composite and amalgam

Effectiveness of a universal adhesive for repair bonding to composite and amalgam

Influence of Filler Loading on the Mechanical Properties of Flowable Resin Composites

Wear resistance of indirect composite resins used for provisional restorations supported by implants

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