Characteristics of low polymerization shrinkage flowable resin composites in newly-developed cavity base materials for bulk filling technique

The aim of this study was to evaluate the correlation between the percent of inorganic filler by weight (wt. %) and by volume (vol. %) of 11 flowable resin composites (FRCs) and their mechanical properties. To establish the correlation, the quantity of inorganic filler was determined by combustion and shape/size analyzed by SEM images. The compressive strength (CS), flexural strength (FS), and flexural modulus (FM) were determined. The CS values were between 182.87-310.38 MPa, the FS values ranged between 59.59 and 96.95 MPa, and the FM values were between 2.34 and 6.23 GPa. The percentage of inorganic filler registered values situated between 52.25 and 69.64 wt. % and 35.35 and 53.50 vol. %. There was a very good correlation between CS, FS, and FM vs. the inorganic filler by wt. % and vol. %. (R2 = 0.8899–0.9483). The highest regression was obtained for the FM values vs. vol. %. SEM images of the tested FRCs showed hybrid inorganic filler for Filtek Supreme XT (A3) and StarFlow (A2) and a homogeneous type of inorganic filler for the other investigated materials. All of the FS values were above 50 MPa, the ISO 4049/2019 limit for FRCs.

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“…%. Nitta et al [24] reported values for inorganic FRC filler between 45.4 and 64.7 wt. % using the same method.…”

Section: Discussionmentioning

confidence: 99%

Influence of Filler Loading on the Mechanical Properties of Flowable Resin Composites

et al. 2020

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“…Shrinkage is widely recognized as an inherent phenomenon in polymerizable monomer resins when polymerization occurs [ 18 , 19 , 20 ]. There have been different methods to measure the volumetric shrinkage of composite resins, such as the use of the mercury dilatometer, the Archimedes method, and the video imaging method [ 44 , 45 , 46 , 47 , 48 ]. AcuVol is a video imaging measurement system that allows for noncontact visual analysis of volume changes in small-volume samples, and it determines volumetric shrinkage in real time based on optical measurements and pattern recognition [ 47 , 48 ].…”

Section: Discussionmentioning

confidence: 99%

Assessment of Degree of Conversion and Volumetric Shrinkage of Novel Self-Adhesive Cement

Ling,

Chen,

Malyala

2024

Polymers

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The degree of monomer conversion and polymerization shrinkage are two of the main reasons for potential adhesion failure between the tooth structure and the restoration substrate. To evaluate the degree of conversion and polymerization shrinkage of a newly developed self-adhesive resin cement, the degree of conversion (DC) was measured using FTIR under different activation modes, temperatures, and times. Volumetric shrinkage was tested using the AcuVol video imaging method. The experimental cement showed a higher DC than other cements under self-curing. The DC of the experimental cement was higher than that of other cements, except SpeedCem Plus under light curing. The experimental cement had a higher DC than other cements, except SpeedCem Plus in some conditions under dual curing. All self-adhesive cements had a higher DC at 37 °C than at 23 °C under self-curing, and there was no statistical difference between 23 °C and 37 °C under light curing. All self-adhesive cements showed a significantly higher DC at 10 min than at 5 min under self-curing. There was no statistical difference between 5 min and 10 min for most cements under dual curing. All self-adhesive cements statistically had the same volumetric shrinkage under light curing and self-curing. The newly developed self-adhesive resin cement exhibited a higher degree of conversion and similar volumetric shrinkage compared to these commercial self-adhesive resin cements.

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“…The decreased light intensity can be compensated for by extending the irradiation time. In the clinical situation, it is important to use a longer irradiation time for the polymerization of cavity base materials [ 41 ]. Another aspect was examined when Zn-doped glass was incorporated in flowable composite for enhancing its antimicrobial character; no significant difference in the DoC between groups was noticed, meaning that the incorporation of Zn-doped glass did not affect the polymerization of the composite [ 25 ].…”

Section: Development Of Discussionmentioning

confidence: 99%

Overviews on the Progress of Flowable Dental Polymeric Composites: Their Composition, Polymerization Process, Flowability and Radiopacity Aspects

Vouvoudi

2022

Polymers

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A review article has been conducted including the main research results and comments referring to flowable dental polymeric materials. To begin with, the synthesis and composition of this category of composites is discussed, revealing the major components of the commercial products in terms of chemistry and proportion. Later, the polymerization characteristics are unfolded regarding the reaction time and rate, volumetric shrinkage and depth of cure for both photocurable and self-curable composites. To continue, some perspectives of the pre-treatment or accompanying processes that a clinician may follow to enhance the materials’ performance are described. Fluidity is certainly associated with the progress of polymerization and the in-depth conversion of monomers to a polymeric network. Last, the aspects of radiopacity and translucency are commented on, showing that all flowable polymeric composites satisfy the radiography rule, while the masking ability depends on the fillers’ properties and specimen thickness. The reviewing article is addressed to all field scientists and practitioners dealing with flowable dental composites studies or applications.

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Characteristics of low polymerization shrinkage flowable resin composites in newly-developed cavity base materials for bulk filling technique

Cited by 11 publications

References 34 publications

Influence of Filler Loading on the Mechanical Properties of Flowable Resin Composites

Influence of Filler Loading on the Mechanical Properties of Flowable Resin Composites

Assessment of Degree of Conversion and Volumetric Shrinkage of Novel Self-Adhesive Cement

Overviews on the Progress of Flowable Dental Polymeric Composites: Their Composition, Polymerization Process, Flowability and Radiopacity Aspects

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