Influence of the composition and shades of ceramics on light transmission and degree of conversion of dual-cured resin cements

Mendonça, Luana Menezes de; Ramalho, Ilana Santos; Lima, Livia Aguiar Santos Nogueira; Pires, Luara Aline; Pegoraro, Thiago Amadei; Pegoraro, Luiz Fernando

doi:10.1590/1678-7757-2018-0351

Cited by 30 publications

(29 citation statements)

References 40 publications

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“…Although dual‐cured resin cements usually show higher values of degree of conversion when compared to light‐cured resin cements [3, 13, 14], the present results exhibited a superior degree of conversion for RelyX Veneer and Allcem Veneer when luted in ceramic thicknesses higher than 1.5 mm. This may be explained by the differences in curing times between the two systems, since light‐cured resin cements reach their maximum polymerization immediately after light activation, unlike the gradual increase of the degree of conversion observed in dual‐cured resin cements due to autopolymerization, which can continue for up to two weeks [12, 43]. In this study, it is evident that a chemical cure is often not sufficient to generate immediately satisfactory degree of conversion values in dual‐cured resin cements, suggesting that long‐term follow‐up could show different results and perhaps higher degree of conversion values.…”

Section: Discussionmentioning

confidence: 93%

“…In this context, to avoid the influence of different ceramic compositions, only one ceramic system, with different thicknesses, was used in this study. Previous studies sought to determine the ideal ceramic thickness for adequate polymerization, showing different results [12, 15, 16, 36]. Leucite glass‐ceramic restorations with thicknesses up to 1.5 mm allowed adequate polymerization of the light‐ and dual‐cured resin cements [15].…”

Section: Discussionmentioning

confidence: 99%

“…The degree of conversion test evaluates polymerization efficiency, directly influencing the physical and mechanical properties of compressive strength, tensile strength, hardness, toughness, and biocompatibility [12]. Previous studies have reported that, in general, the maximum degree of conversion values attained by resin cements is around 60% [14, 39].…”

Section: Discussionmentioning

confidence: 99%

“…Resin cements have been widely used for luting ceramic restorations due to their suitable mechanical properties [7], low solubility [8], biocompatibility [9, 10] and good adhesion to the dental structure [4, 11, 12]. In general, resin cements may have three different curing mechanisms: chemical‐curing, light‐curing, or a combination of both [13, 14].…”

Section: Introductionmentioning

confidence: 99%

“…The thickness, shade, composition, and translucency of the ceramics can also influence light transmission and, consequently, the degree of conversion of the resin cements [12, 13, 23]. Some studies have demonstrated the influence of different ceramic materials and their thickness on degree of conversion or, separately, the Vickers microhardness of resin cements [12, 15, 16, 18]. However, assessing these factors using the irradiance power test can objectively demonstrate how the photopolymerization light interacts with the resin cement.…”

Section: Introductionmentioning

confidence: 99%

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Influence of feldspar ceramic thickness on the properties of resin cements and restorative set

Blumentritt

Cancian

Saporiti

et al. 2021

European J Oral Sciences

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This in vitro study evaluated the influence of feldspathic ceramic thickness on the properties of light‐ and dual‐cured resin cements. For each cement (RelyX Veneer, Allcem Veneer, RelyX Ultimate, and Allcem Dual), three ceramic specimens were prepared, with seven thicknesses for each (0.5, 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5 mm). The degree of conversion, Vickers microhardness, irradiance power, color variation (ΔE00), and translucency parameters were assessed. Microhardness and irradiance power were analyzed using analysis of variance (ANOVA) with post hoc Tukey's test, while ΔE00, translucency parameters, and degree of conversion were analyzed using ANOVA of ranks with post hoc Duncan's Multiple Range Test. The relationship between each of the dependent variables (degree of conversion, ΔE00, and translucency parameter tests) and the specimen thickness was described using linear regression for each of the four resin cements. The significance level for all analyses was set at 5%. RelyX Ultimate yielded the lowest degree of conversion values among all resin cements. Allcem Veneer produced the lowest microhardness values, without statistical differences between thicknesses, of up to 1 mm. Allcem Dual produced the highest ΔE00 and translucency parameter values. Feldspathic ceramic thickness influenced the mechanical properties of resin cements and optical aspects of the restorative set.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of feldspar ceramic thickness on the properties of resin cements and restorative set

Blumentritt

Cancian

Saporiti

et al. 2021

European J Oral Sciences

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Thickness and yttria percentage influences the fracture resistance of laminate veneer zirconia restorations

Malallah

Hasan

2022

Clinical & Exp Dental Res

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Objectives Mechanical properties are cardinal for the long‐term clinical success of laminate veneer restorations but the selection of new restorative materials should ideally be based on clinical evidence, therefore, in vitro testing of dental materials is a good alternative to evaluate their properties and understand their behavior so this study aimed to compare and evaluate the effect of two different thicknesses and yttria percentage on the fracture resistance of laminate veneer zirconia restorations. Materials and Methods Forty laminate veneer restoration prepared from partial sintering zirconia of 3Y (yttria), 5Y (yttria), combined 3Y&5Y (yttria), and lithium disilicate. Specimens were assigned into four main groups according to their percentage of yttria content (n = 10) and subgrouped into two thicknesses (0.5 mm thickness and 0.3 mm thickness) (n = 5) as follows: Group I, II, III, and IV (Group I for lithium disilicate (control), Group II for 3Y zirconia, Group III for 5Y zirconia, and Group IV for combined 3Y&5Y zirconia), each of them subdivided according to their thickness into two subgroups (n = 5 for each one) and resistance to fracture for each restoration was evaluated using a universal testing machine. Data were analyzed using a one‐way analysis of variance and Duncan's tests at a 5% level of significance. Results The thickness of laminate veneer restoration significantly affects the fracture resistance value of all type of laminate veneers restorations (fracture resistance mean value was highest for 0.5 mm thickness and lower for 0.3 mm thickness restorations) and yttria percentage significantly affect fracture resistance value of zirconia laminate veneer restorations (fracture resistance mean value was highest for 0.5 mm thickness of 3Y zirconia [865 N] and combined 3Y&5Y zirconia [846 N]). Conclusions Reducing the thickness of laminate zirconia veneer restorations to 0.3 mm reduces its fracture resistance and increasing yttria percentage had an adverse effect on fracture resistance of zirconia laminate veneer restorations.

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The impact of inorganic fillers, organic content, and polymerization mode on the degree of conversion of monomers in resin-matrix cements for restorative dentistry: a scoping review

Santos,

Fidalgo-Pereira,

Torres

et al. 2024

Clin Oral Invest

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Purpose The main aim of the present study was to carry out a scoping review on the differences in degree of conversion of monomers regarding several types resin cements, indirect restorative materials, and light-curing procedures used in dentistry. Method A bibliographic review was performed on PubMed using the following search items: “degree of conversion” OR “filler” AND “resin cement” OR “inorganic cement” AND “organic” OR “radiopacity” OR “refractive” OR “transmittance” OR “type” AND “resin composite.” The search involved articles published in English language within the last thirteen years. A research question has been formulated following the PICO approach as follow: “How different is the degree of conversion of monomers comparing several types of resin-matrix cements?”. Results Within the 15 selected studies, 8 studies reported a high degree of conversion (DC) of the organic matrix ranging from 70 up to 90% while 7 studies showed lower DC values. Dual-cured resin-matrix cements revealed the highest mean values of DC, flexural strength, and hardness when compared with light- and self-polymerized ones. DC mean values of resin-matrix cements light-cured through a ceramic veneer with 0.4 mm thickness were higher (~ 83%) than those recorded for resin-matrix cements light-cured through a thicker ceramic layer of 1.5 mm (~ 77%). Conclusions The highest percentage of degree of conversion of monomers was reported for dual-cured resin-matrix cements and therefore both chemical and light-induced pathways promoted an enhanced polymerization of the material. Similar degree of conversion of the same resin-matrix cement were recorded when the prosthetic structure showed a low thickness. On thick prosthetic structures, translucent materials are required to allow the light transmission achieving the resin-matrix cement. Clinical relevance The chemical composition of resin-matrix cements and the light-curing mode can affect the polymerization of the organic matrix. Thus, physical properties of the materials can vary leading to early clinical failures at restorative interfaces. Thus, the analysis of the polymerization pathways of resin-matrix cements is significantly beneficial for the clinical performance of the restorative interfaces.

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Influence of the composition and shades of ceramics on light transmission and degree of conversion of dual-cured resin cements

Cited by 30 publications

References 40 publications

Influence of feldspar ceramic thickness on the properties of resin cements and restorative set

Influence of feldspar ceramic thickness on the properties of resin cements and restorative set

Thickness and yttria percentage influences the fracture resistance of laminate veneer zirconia restorations

The impact of inorganic fillers, organic content, and polymerization mode on the degree of conversion of monomers in resin-matrix cements for restorative dentistry: a scoping review

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