Edge strength of resin-composite margins

Watts, David C.; Issa, Mohsen A.; Ibrahim, Adamkolo Mohammed; Wakiaga, J; Al-Samadani, Khalid H; Al-Azraqi, M.; Silikas, Nick

doi:10.1016/j.dental.2007.04.006

Cited by 44 publications

(44 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8,11 Figures 3 and 4 show geometry and area overcoming the CF effects: when the CF was constant, the erosion geometry and higher QR resulted in higher stress concentration; but, when QR was kept constant, the higher CF in the abfraction cavity showed lower MPS concentration. These results are consistent with Rodrigues and others, 14 who rejected the hypothesis that interfacial shrinkage stresses between adjoining walls in cavities increases with CF, and with other authors [31][32][33][34][35] who have said that using CF as a single predictor for shrinkage stress has not been universally accepted.…”

supporting

confidence: 81%

Impact of Quantity of Resin, C-factor, and Geometry on Resin Composite Polymerization Shrinkage Stress in Class V Restorations

Tribst

Borges

Xavier

et al. 2014

Operative Dentistry

View full text Add to dashboard Cite

Adhesive dentistry allows for the simple removal of decayed tissue to guide preparation design. Knowledge about differences in stress concentration within cavities can help in understanding the impact of shape and cavosurface angle of the cavity, optimizing the distribution of stress during the cure of the restorative material and improving the expected lifetime of the restoration. SUMMARYObjective: This study evaluated the effect of quantity of resin composite, C-factor, and geometry in Class V restorations on shrinkage stress after bulk fill insertion of resin using two-dimensional finite element analysis.Methods: An image of a buccolingual longitudinal plane in the middle of an upper first premolar and supporting tissues was used for modeling 10 groups: cylindrical cavity, erosion, and abfraction lesions with the same Cfactor (1.57), a second cylindrical cavity and abfraction lesion with the same quantity of resin (QR) as the erosion lesion, and then all repeated with a bevel on the occlusal cavosurface angle. The 10 groups were imported into Ansys 13.0 for two-dimensional finite element analysis. The mesh was built with 30,000 triangle and square elements of 0.1 mm in length for all the models. All materials were considered isotropic, homogeneous, elastic, and linear, and the resin composite shrinkage was simulated by thermal analogy. The maximum principal (MPS) and von Mises stresses (VMS) were analyzed for comparing the behavior of the groups.Results: Different values of angles for the cavosurface margin in enamel and dentin were obtained for all groups and the higher the angle, the lower the stress concentration. When the groups with the same C-factor and QR were compared, the erosion shape cavity showed the highest MPS and VMS values, and abfraction shape, the lowest. A cavosurface bevel decreased the stress values on the occlusal margin. The geometry factor overcame the effects of C-factor and QR in some situations.Conclusion: Within the limitations of the current methodology, it is possible to conclude that the combination of all variables studied influences the stress, but the geometry is the most important factor to be considered by the operator.

show abstract

supporting

confidence: 81%

Impact of Quantity of Resin, C-factor, and Geometry on Resin Composite Polymerization Shrinkage Stress in Class V Restorations

Tribst

Borges

Xavier

et al. 2014

Operative Dentistry

View full text Add to dashboard Cite

show abstract

“…The force (N)-to-fracture at a distance of 0.5 mm from the edge was defined as the ''edge-strength''. 27 The results showed that the highest failure-force at 0.5 mm (edge-strength) was found with Grandio flow (130.2 N) while the lowest was with Filtek flow (103.6 N). Statistical significant differences in the failure-forces at each distance ( p < 0.05) were found between flowable composites.…”

Section: Resultsmentioning

confidence: 89%

“…1). 27 The standard load range capacity is 0-10,000 N. It has a built-in acoustic sensing facility and a data output display on the front panel. It determines the force required to cause fracture of a material by a Vickers diamond indenter at progressively increasing distances from an interface edge of a bulk material.…”

Section: Ck10 Edge-strength Instrumentmentioning

confidence: 99%

“…The ability of restorative materials to withstand fracture at 0.5 mm of a thin edge can be described as ''edge-strength''. 27 This study was conducted in vitro to evaluate the failureforces of flowable composites at different distances from an interface edge of a bulk material. The specific objectives were to measure: (i) failure-forces to fracture materials at several distances from the edge starting at 0.4-1.0 mm with 0.1 mm interval distance, and (ii) examine the mode of failure at the edge.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Edge-strength of flowable resin-composites

Baroudi

Silikas

Watts

2008

Journal of Dentistry

View full text Add to dashboard Cite

“…[11][12] In addition, resin composites exhibit a six-to-eight times greater thermal expansion than the surrounding tooth structures; 13 polymerization contraction, along with thermal contraction, might create high interfacial stresses in preheated composites upon thermal equilibrium, which affects the marginal adaptation, integrity and seal. [14][15] The magnitude of polymerization shrinkage stresses depends on the material's composition, stiffness and flow of the composite, rate of polymerization and restoration geometry. 16 These factors combine and interact simultaneously in complex ways, translating polymerization shrinkage into tooth stresses.…”

Section: Introductionmentioning

confidence: 99%

Cuspal Movement and Gap Formation in Premolars Restored with Preheated Resin Composite

ElSayad¹

2009

Operative Dentistry

View full text Add to dashboard Cite

SUMMARYObjective: The current study aimed to determine the effect of preheating resin composite to three different temperatures on the cuspal movement and gap formation at the tooth/restoration interface. Methods: Fifty extracted, sound human upper premolars were subjected to standardized MOD cavity preparations. Five groups of 10 premolars each were restored with either 1) Tetric Ceram HB, 2) a layer of Tetric Flow followed by Tetric Ceram HB, 3-5) preheated composite to 37°C, 54°C and 68°C, respectively, using a chairside preheating device (Calset thermal assist unit). Cuspal movement was calculated by measuring the intercuspal distance between the indexed cusp tips before restoration 5 minutes and 24 hours after composite curing using a stereomicroscope. The teeth were sectioned longitudinally and examined under a stereomicroscope connected to a digital camera and image analysis software to detect gap formation. Results: Group 2 showed the least cuspal movement at 5 minutes and 24 hours and the highest gap area, while Groups 4 and 5 showed the highest cuspal movement at 5 minutes and 24 hours. Group 3 had the least gap area. Conclusions: Preheating resin composite to temperatures higher than 37°C increases cuspal movement. The adaptation and gap area of preheated resin composite to 37°C and 54°C improved, but it did not change with resin composite preheated to 68°C. INTRODUCTIONViscoelastic materials, such as resin composites, exhibit decreased viscosity and greater flowability with temperature increase. 1-2 This makes them easily applied and adapted to cavity walls. [3][4] Recently, preheating resin composites with suitable devices has been advocated as a method to reduce paste viscosity, improve marginal adaptation and monomer conversion and shorten curing times. 5 The temperature at which the polymerization occurs affects the conversion process and polymer properties. 6-9 Increased temperature enhances both radical and monomer mobility, resulting in higher overall conversion and reaction rate. Cuspal Movement and Gap Formation in Premolars Restored with Preheated Resin Composite I Elsayad Clinical RelevanceThe use of preheated resin composite to 37°C may improve adaptation and decrease interfacial gaps, but when the composite is preheated to higher temperatures, including 54°C and 68°C, this can cause tooth deformation and subsequently other clinical manifestations.

show abstract

Edge strength of resin-composite margins

Cited by 44 publications

References 14 publications

Impact of Quantity of Resin, C-factor, and Geometry on Resin Composite Polymerization Shrinkage Stress in Class V Restorations

Impact of Quantity of Resin, C-factor, and Geometry on Resin Composite Polymerization Shrinkage Stress in Class V Restorations

Edge-strength of flowable resin-composites

Cuspal Movement and Gap Formation in Premolars Restored with Preheated Resin Composite

Contact Info

Product

Resources

About