Interpretation of bond failure through conversion and residual solvent measurements and Weibull analyses of flexural and microtensile bond strengths of bonding agents

Dickens, Sabine H.; Cho, Byeong-Hoon

doi:10.1016/j.dental.2004.05.007

Cited by 142 publications

(135 citation statements)

References 26 publications

Supporting

Mentioning

123

Contrasting

Unclassified

Order By: Relevance

“…The conversion of the resin decreased from ~54% to ~25% when more than 20% water was added [17]. The extent of monomer conversion [19][20][21][22] and the presence of phase separations in the presence of water [6,[23][24][25][26] during polymerization are very influential on the structure and properties of the resulting polymer.…”

Section: Introductionmentioning

confidence: 99%

Effects of water content and initiator composition on photopolymerization of a model BisGMA/HEMA resin

Guo¹,

Wang²,

Spencer³

et al. 2008

Dental Materials

View full text Add to dashboard Cite

Aims-The purpose of this study was to evaluate the effects of photoinitiator type and water content on the polymerization rate (R p ) and degree of conversion (DC) of a model BisGMA/HEMA-based resin.Materials and methods-The comonomer mixture consisted of BisGMA/HEMA (60/40 by weight). Different two-or three-component photoinitiator systems were incorporated. Twocomponent systems were 0.5% CQ (camphorquinone) and 0.5% DMAEMA (2-(dimethylamino) ethyl methacrylate) or 0.5% CQ and 0.5% 4E (Ethyl 4-dimethylaminobenzoate). The threecomponent systems were added 1% DPIHP (diphenyliodonium hexafluorophosphate) to the above systems. Each system was tested as made, or after addition of 5, 10, 15wt% water. When cured under a conventional dental light, the R p and DC of each formulation was determined using time-resolved attenuated total reflection (ATR)-Fourier transform infrared (FTIR) spectroscopy.Results-For mixtures containing two-component initiator systems, when the hydrophobic initiator CQ was used in combination with hydrophilic DMAEMA, R p s and DCs were dramatically decreased as a function of water content. The R p s and DCs of the hydrophobic CQ/4E system were higher than those of the CQ/DMAEMA system in the presence of water. For three-component initiator systems, incorporation of DPIHP enhanced the polymerization of all mixtures in the presence of water compared to their counterpart two-component initiators. Interestingly, the CQ/DMAEMA caused greater DC and Rp when DPIHP was used.Significance-The hydrophobicity/hydrophilicity of photoinitiator components significantly affects both the DC as well as R p when in the presence of water. The results indicate that formulation of photoinitiator components should be based on the effectiveness of the bonding systems under both dry and wet conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of water content and initiator composition on photopolymerization of a model BisGMA/HEMA resin

Guo¹,

Wang²,

Spencer³

et al. 2008

Dental Materials

View full text Add to dashboard Cite

show abstract

“…The failure analysis suggested that the groups showing low bond strength (Xeno III and 3 ㎜ hole) result in a higher incidence of 'failure at the top of the hybrid layer'than the groups showing high bond strength (SBMP and 1 ㎜ hole, Table 2 and Figure 3). Since the 'failure at the top of the hybrid layer'was mainly composed of plain detached area, it could originate from early debonding between the hybrid layer and adhesive layer, which was developed by the contraction stress from the polymerizing resin composite at an early stage of the bonding procedure 10,23) . It is well accepted that increased bonded area increases the inherent defect and as a result, decreases bond strength.…”

Section: ⅳ Discussionmentioning

confidence: 99%

“…Moreover, even if the bonding agent is cured properly following the manufacturer' s instruction, the initial strength of the adhesive layer is so poor that it cannot resist the shrinkage stress of the polymerizing resin composite. The shrinkage stress may result in cracks within the bonded complex during an early stage of the filling procedure 10) and may lead to gap formation, marginal discoloration, postoperative sensitivity, and secondary caries 11) . The bond strength at each wall within a cavity may be affected by the bond strength, named here as bond quality, of the bonding agent applied to the other walls within the cavity, as well as the ratio of bonded/unbonded area.…”

Section: ⅰ Introductionmentioning

confidence: 99%

Effect of cavity shape, bond quality and volume on dentin bond strength

Kim

Lee

Lim

et al. 2005

J Korean Acad Conserv Dent

View full text Add to dashboard Cite

The aim of this study was to evaluate the effect of cavity shape, bond quality of bonding agent and volume of resin composite on shrinkage stress developed at the cavity floor. This was done by measuring the shear bond strength with respect to iris materials (cavity shape; adhesive-coated dentin as a high C-factor and Teflon-coated metal as a low C-factor), bonding agents (bond quality; Scotchbond TM Multi-purpose and Xeno � III) and iris hole diameters (volume; 1 ㎜ or 3 ㎜ in diameter × 1.5 ㎜ in thickness). Ninety-six molars were randomly divided into 8 groups (2 × 2 × 2 experimental setup). In order to simulate a Class I cavity, shear bond strength was measured on the flat occlusal dentin surface with irises. The iris hole was filled with Z250 restorative resin composite in a bulk-filling manner. The data was analyzed using three-way ANOVA and the Tukey test. Fracture mode analysis was also done. When the cavity had high C-factor, good bond quality and large volume, the bond strength decreased significantly. The volume of resin composite restricted within the well-bonded cavity walls is also be suggested to be included in the concept of C-factor, as well as the cavity shape and bond quality. Since the bond quality and volume can exaggerate the effect of cavity shape on the shrinkage stress developed at the resin-dentin bond, resin composites must be filled in a method, which minimizes the volume that can increase the C-factor. [J Kor Acad Cons Dent 30(6):450-460, 2005]

show abstract

“…These stresses are undesirable because they are associated with defects, post-operative sensitivity, and secondary caries. [3][4][5] In the past few years, several strategies have been undertaken to develop dental resin systems with reduced shrinkage. One was the preparation of oligomers of methyl methacrylate with higher molecular weights than the BIS-GMA-based systems.…”

Section: Introductionmentioning

confidence: 99%

The effect of a dithiol spiroorthocarbonate on mechanical properties and shrinkage of a dental resin

Ortiz

Gómez

Duarte

et al. 2014

Designed Monomers and Polymers

View full text Add to dashboard Cite

A novel spiroorthocarbonate with two thiol groups (SOC DITHIOL) was synthesized. This monomer was formulated with dimethacrylate monomers used in dental resins and photopolymerized with an LED dental lamp. The presence of the thiol groups in the monomer enabled it to react with the double bonds of the dimethacrylate monomers by means of the thiol-ene mechanism. Additionally, the SOC DITHIOL underwent cationic ring-opening polymerization, producing the corresponding poly(ether-carbonates). SOC DITHIOL was added to a formulation of a conventional acrylic resin, which includes a mixture of dimethacrylate monomers [glycerolate bisphenol A dimethacrylate (BIS-GMA)/ urethane dimethacrylate (UDMA)/triethyleneglycol dimethacrylate (TEGDMA)] in 50/30/20 M ratio). Concentration of the prepared SOC was varied in the above dimethacrylate formulation in the range of 5-30 mol%. Kinetics of photopolymerization were determined by means of real time Fourier transform infrared spectroscopy, finding that increasing concentrations of the SOC DITHIOL in the formulations, not only did not affect the photopolymerization rate of the acrylic resins, but it helped to increase the final conversion of the methacrylate groups. It was also found that the presence of SOC DITHIOL increased the elastic modulus of the resulting cross-linked polymer. The addition of 30% of SOC DITHIOL reduced shrinkage 59% in comparison with a sample without the SOC.

show abstract

Interpretation of bond failure through conversion and residual solvent measurements and Weibull analyses of flexural and microtensile bond strengths of bonding agents

Cited by 142 publications

References 26 publications

Effects of water content and initiator composition on photopolymerization of a model BisGMA/HEMA resin

Effects of water content and initiator composition on photopolymerization of a model BisGMA/HEMA resin

Effect of cavity shape, bond quality and volume on dentin bond strength

The effect of a dithiol spiroorthocarbonate on mechanical properties and shrinkage of a dental resin

Contact Info

Product

Resources

About