Effects of the lining material, thickness and coverage on residual stress of class II molar restorations by multilayer technique

Sun, Tinghui; Shao, Bingmei; Li, Zhan

doi:10.1016/j.cmpb.2021.105995

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…Therefore, eventually generating higher marginal misfit, post-operative sensitivity or dental fracture, compromising the longevity of the dental treatment [9]. To compensate this, an intermediate elastic modulus material should be preferable and the multilayer technique applied as a practical and effective approach to lower the shrinkage stresses by adding a base layer under the restorative material [21]. Biomaterials that possess adequate compressive and tensile strength and relatively low elastic modulus could act as a cushion layer to the shrinkage stress transmitted to the tooth tissues [21].…”

Section: Discussionmentioning

confidence: 99%

“…To compensate this, an intermediate elastic modulus material should be preferable and the multilayer technique applied as a practical and effective approach to lower the shrinkage stresses by adding a base layer under the restorative material [21]. Biomaterials that possess adequate compressive and tensile strength and relatively low elastic modulus could act as a cushion layer to the shrinkage stress transmitted to the tooth tissues [21]. However, in adhesive restorations, the mechanical behavior under compressive loading and shrinkage stress can be associated with several factors other than the material, including the enamel and dentine volumes lost [4].…”

Section: Discussionmentioning

confidence: 99%

“…The stress is influenced by the restorative technique, mechanical properties, polymerization rate [18,19], and for some C-Factors, in particular small cavities [20]. As a measure of a restoration's confinement, the C-factor (Fc) is defined as the ratio of the bonded to not-bonded (free) surfaces of the restoration [21]. It is hypothesized that shrinkage stress increases with an increasing C-factor [21,22].…”

Section: Introductionmentioning

confidence: 99%

“…As a measure of a restoration's confinement, the C-factor (Fc) is defined as the ratio of the bonded to not-bonded (free) surfaces of the restoration [21]. It is hypothesized that shrinkage stress increases with an increasing C-factor [21,22]. The constraints and stress magnitude generated in dental restorations are highly non-uniform, therefore not only the C-factor should be considered when evaluating the stress state [23].…”

Section: Introductionmentioning

confidence: 99%

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Polymerization Shrinkage, Hygroscopic Expansion, Elastic Modulus and Degree of Conversion of Different Composites for Dental Application

et al. 2021

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Objectives: To characterize the mechanical properties of different resin-composites for dental application. Methods: Thirteen universal dentin shade composites (n = 10) from different manufacturers were evaluated (4 Seasons, Grandio, Venus, Amelogen Plus, P90, Z350, Esthet-X, Amaris, Vita-l-escence, Natural-Look, Charisma, Z250 and Opallis). The polymerization shrinkage percentage was calculated using a video-image recording device (ACUVOL—Bisco Dental) and the hygroscopic expansion was measured after thermocycling aging in the same equipment. Equal volumes of material were used and, after 5 min of relaxation, baseline measurements were calculated with 18 J of energy delivered from the light-curing unit. Specimens were stored in a dry-dark environment for 24 h then thermocycled in distilled water (5–55 °C for 20,000 cycles) with volume measurement at each 5000 cycles. In addition, the pulse-excitatory method was applied to calculate the elastic modulus and Poisson ratio for each resin material and the degree of conversion was evaluated using Fourier transform infrared spectroscopy. Results: The ANOVA showed that all composite volumes were influenced by the number of cycles (α = 0.05). Volumes at 5 min post-polymerization (12.47 ± 0.08 cm3) were significantly lower than those at baseline (12.80 ± 0.09 cm3). With regard to the impact of aging, all resin materials showed a statistically significant increase in volume after 5000 cycles (13.04 ± 0.22 cm3). There was no statistical difference between volumes measured at the other cycle steps. The elastic modulus ranged from 22.15 to 10.06 GPa and the Poisson ratio from 0.54 to 0.22 with a significant difference between the evaluated materials (α = 0.05). The degree of conversion was higher than 60% for all evaluated resin composites.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Polymerization Shrinkage, Hygroscopic Expansion, Elastic Modulus and Degree of Conversion of Different Composites for Dental Application

et al. 2021

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Influence of internal angle and shape of the lining on residual stress of Class II molar restorations

Zuo,

Li,

Teng

et al. 2024

Computer Methods in Biomechanics and Biomedical Engineering

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Biomechanical performance of resin composite on dental tissue restoration: A finite element analysis

Ouldyerou,

Mehboob,

Mehboob

et al. 2023

PLoS ONE

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This study investigates the biomechanical performance of various dental materials when filled in different cavity designs and their effects on surrounding dental tissues. Finite element models of three infected teeth with different cavity designs, Class I (occlusal), Class II mesial-occlusal (MO), and Class II mesio-occluso-distal (MOD) were constructed. These cavities were filled with amalgam, composites (Young’s moduli of 10, 14, 18, 22, and 26 GPa), and glass carbomer cement (GCC). An occlusal load of 600 N was distributed on the top surface of the teeth to carry out simulations. The findings revealed that von Mises stress was higher in GCC material, with cavity Class I (46.01 MPa in the enamel, 23.61 MPa in the dentin), and for cavity Class II MO von Mises stress was 43.64 MPa, 39.18 MPa in enamel and dentin respectively, while in case of cavity Class II MOD von Mises stress was 44.67 MPa in enamel, 27.5 in the dentin. The results showed that higher stresses were generated in the non-restored tooth compared to the restored one, and increasing Young’s modulus of restorative composite material decreases stresses in enamel and dentin. The use of composite material showed excellent performance which can be a good viable option for restorative material compared to other restorative materials.

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Effects of the lining material, thickness and coverage on residual stress of class II molar restorations by multilayer technique

Cited by 4 publications

References 32 publications

Polymerization Shrinkage, Hygroscopic Expansion, Elastic Modulus and Degree of Conversion of Different Composites for Dental Application

Polymerization Shrinkage, Hygroscopic Expansion, Elastic Modulus and Degree of Conversion of Different Composites for Dental Application

Influence of internal angle and shape of the lining on residual stress of Class II molar restorations

Biomechanical performance of resin composite on dental tissue restoration: A finite element analysis

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