The influence of short and medium-term water immersion on the hydrolytic stability of novel low-shrink dental composites

Palin, William M.; Fleming, Garry J.P.; Burke, F. J. T.; Marquis, P. M.; Randall, Ros C.

doi:10.1016/j.dental.2005.01.004

Cited by 164 publications

(137 citation statements)

References 43 publications

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“…This is consistent with the results of Palin and others, 47 who explained that the longer time exhibited to reach gel point and the slower development of a cross-linked network in SIL provide for sufficient flow of the molecules, allowing them to arrange themselves in less stressed configurations. These results were also supported by the significantly lower elastic modulus exhibited by both SIL and AL.…”

Section: Discussionsupporting

confidence: 81%

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

El-Sahn

El-Kassas

El-Damanhoury

et al. 2011

Operative Dentistry

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SUMMARY This study evaluated the microtensile bond strength (μ-TBS) of low-shrinkage composites with their corresponding adhesive systems, Filtek Silorane/Silorane adhesive (SIL, 3M ESPE AG, Seefeld, Germany) and Aelite LS/One-Step Plus (AL, BISCO Inc, Schaumburg, IL, USA) in cavities with different C-factors. Filtek Z250/Adper Single Bond Plus (Z, 3M ESPE, St Paul, MN, USA) was used as a control. Method Standardized Class I cavities were prepared in extracted human molars after removing occlusal enamel. Cavities were assigned into six different C-factors by applying nail polish to four walls, three walls, two walls adjacent to each other, two walls opposite to each other, one wall, or no walls. Resin composites with their corresponding adhesive systems were applied according to manufacturer instructions. Specimens were sectioned to obtain four rectangular beams from the center of the restorations and μ-TBS was measured. Data were analyzed by Weibull survival analysis. Shrinkage stresses of the resin composites were determined after 30 minutes from the start of light-curing using a tensometer testing machine. Flexure elastic modulus was determined using standard procedures, in accordance with ISO 4049. Data for shrinkage stress and elastic modulus were analyzed by one-way analysis of variance followed by a Tukey multiple-comparisons test (p<0.05). Results μ-TBS of both SIL and AL were not affected by different C-factors; however, the bond strength of Z decreased significantly when the C-factor increased. Shrinkage stress results were 0.94±0.1, 1.79±0.18, and 2.14±0.23 MPa for SIL, AL, and Z, respectively. The flexural modulus of both the SIL and the AL was significantly lower than that of Z. Conclusions Increasing C-factor did not negatively affect the bond strength of low-shrinkage composites.

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Section: Discussionsupporting

confidence: 81%

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

El-Sahn

El-Kassas

El-Damanhoury

et al. 2011

Operative Dentistry

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“…Filtek P90 promoted the highest VHN values which can be attributed to the cationic polymerization reaction. It is characterized by continuous ring-opening expansion initiated at the time of curing and promoted further crosslinking and hardening of the entire matrix 24,25 . This cationic reaction is initiated by an acidic cation that allows stress relaxation, thereby, reducing polymerization contraction of the composite 6,25 .…”

Section: Discussionmentioning

confidence: 99%

“…It is characterized by continuous ring-opening expansion initiated at the time of curing and promoted further crosslinking and hardening of the entire matrix 24,25 . This cationic reaction is initiated by an acidic cation that allows stress relaxation, thereby, reducing polymerization contraction of the composite 6,25 . The Filtek ® P90 composite is characterized by a special resin matrix chemistry that differs from the commonly known dental composites based on dimethacrylate resin.…”

Section: Discussionmentioning

confidence: 99%

Post-irradiation vickers microhardness development of novel resin composites

Marghalani

2010

Mat. Res.

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The aim of this study was to evaluate the effect of post-irradiation dry aging at different periods of time on Vickers microhardness of some dental composites based on various resin matrices. Sixty four disc-shaped specimens of the resin composites were prepared in a split Teflon mold (8 × 2 mm) and irradiated by Optilux 501 light cure (500 mW.cm -2 for 40 seconds) on their top side. The specimens were aged-dry in dark at 23 and 37 °C for the following storage periods; immediate, 1/2 an hour, 1, 6, 12, 24, 48 and 168 hours. The microhardness values were recorded using a Vickers Hardness Tester at 300 g load for 15 seconds. Results showed that Filtek ® P90 and Definite expressed the highest hardness value followed by Tetric Evoceram and then Premise Enamel. At each aging period, all materials demonstrated significant differences between hardness values of top and base surfaces as well as both temperatures examined (P < 0.05). In conclusion, surface hardness developed gradually in most of the materials reaching optimum after 168 hours post-irradiation aging. Dental composites based on silorane and ormocer resin matrices achieved higher Vickers microhardness than those based on dimethacrylates resin.

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“…The low solubility and stability of silorane in aqueous systems has been reported before. [21][22][23][24] Filtek P60 had the highest Wsp and one of the lowest Wsl results; this may be related to its fi ller composition. Therefore, it may be hypothesized that hybrid composites with zirconia-derived fi llers could lead to a freer volume among the fi llers, considering KH is a mechanical property that may be related to the wear resistance of materials and their ability to remain stable.…”

Section: Statistical Analysesmentioning

confidence: 99%

Do new matrix formulations improve resin composite resistance to degradation processes?

et al. 2013

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The aim of this study was to determine the degradation resistance of three new formulations-silorane-, Ormocer-and dimer-acidbased materials-and compare them to the traditional dimethacrylatebased materials. One silorane-(Filtek P90, P90), one Ormocer-(Ceram-X, CX), one dimer-acid-(N'Durance, ND) and two dimethacrylate-based (Filtek P60, P60; Tetric Ceram, TC) materials were investigated. Water sorption (Wsp) and solubility (Wsl) were determined after the materials were immersed in water for 28 days. Knoop hardness (KH) was determined before and after 24 h immersion in pure ethanol. The flexuralstrength (FS) was determined by the bending test after one-week storage in a dry environment or after one-week immersion in pure ethanol. Data were submitted to analysis of variance (ANOVA) and Tukey's test (95%). The three new formulations showed lower Wsp than the dimethacrylatebased formulation. CX (0.50 ± 0.17%) and ND (0.72 ± 0.19%) exhibited the lowest Wsp, whereas P90 (0.02 ± 0.03%) and P60 (0.04 ± 0.03%) showed the lowest Wsl. All resins showed reduced Knoop hardness number (KHN) after ethanol immersion. P60 presented the lowest decrease in KH value (19 ± 5%). TC (48 ± 3%) and P90 (39 ± 9%) showed the highest KHN decrease after ethanol storage. The FS of CX, ND and TC were affected by ethanol storage. The new formulations did not improve the degradation resistance, as compared with the traditional methacrylatebased materials.

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The influence of short and medium-term water immersion on the hydrolytic stability of novel low-shrink dental composites

Cited by 164 publications

References 43 publications

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

Effect of C-factor on Microtensile Bond Strengths of Low-Shrinkage Composites

Post-irradiation vickers microhardness development of novel resin composites

Do new matrix formulations improve resin composite resistance to degradation processes?

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