Evaluation of the effect of water-uptake on the impedance of dental resins

Wadgaonkar, Bakul; Ito, Sachiko; Svizero, Nádia da Rocha; Elrod, David A.; Foulger, Stephen H.; Rodgers, Robert S.; Oshida, Yoshiki; Kirkland, Kevin; Sword, Jeremy; Rueggeberg, Frederick A.; Tay, Franklin R.; Pashley, David H.

doi:10.1016/j.biomaterials.2006.01.045

Cited by 25 publications

(31 citation statements)

References 14 publications

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“…13 The use of increasing concentrations of hydrophilic resins in contemporary dentin adhesives raises concern on whether such adhesives have become too hydrophilic. 14,15 Similar to the results derived from other biomedical fields, 16,17 incorporation of hydrophilic resin monomers results in increases in water sorption [18][19][20][21][22][23][24][25] and decreases in mechanical properties of these resins. [26][27][28] These hydrophilic resinous films are also highly permeable to water [29][30][31] that further expedite their hydrolysis.…”

Section: Introductionsupporting

confidence: 83%

Application of hydrophobic resin adhesives to acid‐etched dentin with an alternative wet bonding technique

Sadek

Pashley

Nishitani

et al. 2007

J Biomedical Materials Res

100

132

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Hydrophilic dentin adhesives are prone to water sorption that adversely affects the durability of resin-dentin bonds. This study examined the feasibility of bonding to dentin with hydrophobic resins via the adaptation of electron microscopy tissue processing techniques. Hydrophobic primers were prepared by diluting 2,2-bis[4(2-hydroxy-3-methacryloyloxy-propyloxy)-phenyl] pro- pane/triethyleneglycol dimethacrylate resins with known ethanol concentrations. They were applied to acid-etched moist dentin using an ethanol wet bonding technique that involved: (1) stepwise replacement of water with a series of increasing ethanol concentrations to prevent the demineralized collagen matrix from collapsing; (2) stepwise replacement of the ethanol with different concentrations of hydrophobic primers and subsequently with neat hydrophobic resin. Using the ethanol wet bonding technique, the experimental primer versions with 40, 50, and 75% resin exhibited tensile strengths which were not significantly different from commercially available hydrophilic three-step adhesives that were bonded with water wet bonding technique. The concept of ethanol wet bonding may be explained in terms of solubility parameter theory. This technique is sensitive to water contamination, as depicted by the lower tensile strength results from partial dehydration protocols. The technique has to be further improved by incorporating elements of dentin permeability reduction to avoid water from dentinal tubules contaminating water-free resin blends during bonding.

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Section: Introductionsupporting

confidence: 83%

Application of hydrophobic resin adhesives to acid‐etched dentin with an alternative wet bonding technique

Sadek

Pashley

Nishitani

et al. 2007

J Biomedical Materials Res

100

132

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“…This is probably attributed to the CDA presented on the outer surface of the CDA-incorporated resin. The profiles of chlorhexidine release from resin blends R1-R5, in general, corresponded with the changes in resistance and capacitance of thin resin films prepared from the same five resin blends [26]. The cumulative chlorhexidine release also correlated significantly with water sorption of the resin disks (Fig.5), which is indicative of swelling within the polymer matrix [27].…”

Section: Discussionmentioning

confidence: 70%

“…This is probably the result of more severe swelling of the polymer network in the R5 resin by water intake. As a result of swelling, water channels were probably enlarged in the polymer [26], through which rapid diffusion of the water molecules was facilitated. Water would slowly elute CDA depending on its solubility in water and its diffusion coefficient through the resin matrix.…”

Section: Discussionmentioning

confidence: 99%

Chlorhexidine release and water sorption characteristics of chlorhexidine-incorporated hydrophobic/hydrophilic resins

Hiraishi¹,

Yiu²,

King³

et al. 2008

Dental Materials

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“…Water sorption is enhanced by the presence of hydrophilic and ionic resin monomers, [41][42] which, in turn, facilitate ion movement within a polymerized resin matrix. [42][43] This water movement causes hydrolytic degradation and likely leaching of the hydrolyzed components of porous dentin adhesive coatings with an associated increase in permeability, thus creating a vicious cycle that increases deterioration of the mechanical properties of the adhesive coatings. 44 If solvent is not adequately removed, it represents areas of incomplete polymerization and/or hydrogel formation within the adhesive layer, 30,44 similar to what could have occurred in the cold air-dried groups.…”

Section: Discussionmentioning

confidence: 99%

The Use of Warm Air Stream for Solvent Evaporation: Effects on the Durability of Resin-dentin Bonds

Reis¹,

Klein-Júnior²,

Souza³

et al. 2010

Operative Dentistry

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This study evaluated the effect of a warm (W) or cold (C) air-dry stream for solvent evaporation on the immediate (IM) and six-month (6M) resindentin bond strength (µTBS) and silver nitrate uptake pattern (SNU) of two-step etch-and-rinse adhesive system (Adper Single Bond [SB] and Prime & Bond 2.1 [PB]). The adhesives were applied on demineralized dentin surfaces and a warm or cold air-dry stream (10 seconds) was applied followed by light-activation (10 seconds). After 24-hours of water storage, the specimens were serially sectioned in the "x" and "y" directions to obtain bonded sticks around 0.8 mm 2 to be tested immediately or after six months of water storage. The specimens at each period were immersed in a 50% solution of silver nitrate, photodeveloped and analyzed by SEM for SNU. Clinical RelevanceIn terms of silver nitrate uptake, the use of a warm air stream may improve bonding interface resistance to degradation over time. In terms of bond strength values, a warm air stream only improved the resin-dentin bond strengths of the ethanol/water-based system. Laboratory ResearchHigher IM µTBS values were observed for SB under W conditions. Both adhesives showed reductions in µTBS after 6M in both air temperatures. Regarding SEM, a low silver nitrate uptake was observed in the W groups either in IM or 6M for both adhesives.

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Evaluation of the effect of water-uptake on the impedance of dental resins

Cited by 25 publications

References 14 publications

Application of hydrophobic resin adhesives to acid‐etched dentin with an alternative wet bonding technique

Application of hydrophobic resin adhesives to acid‐etched dentin with an alternative wet bonding technique

Chlorhexidine release and water sorption characteristics of chlorhexidine-incorporated hydrophobic/hydrophilic resins

The Use of Warm Air Stream for Solvent Evaporation: Effects on the Durability of Resin-dentin Bonds

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