Degree of Conversion, Monomer Elution, Depth of Cure and Marginal Leakage of a Bulk Fill Composite
Tarek Mohamed Elshazly;
Abstract
The aim of this study was to evaluate the effect of different packing techniques and time of curing on a bulk fill composite compared to an incrementally placed nano-filled composite regarding their degree of conversion, monomer elution, depth of cure, and marginal leakage.
The specimens were prepared and divided according to the packing technique used into 3 different groups; Filtek Supreme composite incrementally packed (FS-I), Filtek One Bulk fill composite incrementally packed (FB-I), and Filtek One Bulk fill composite bulk packed (FB-B). Each group was further subdivided into 3 subgroups according to the curing time into 20 seconds, 30 seconds, and 40 seconds groups. For degree of conversion and monomer elution tests, the specimens were measured at different storage periods: 24 hours, 7days and one month.
The degree of conversion was evaluated using ATR-FTIR spectrometer, while monomer elution test was performed using HPLC machine. Depth of Cure (DoC) values were obtained by calculating bottom/top hardness number ratios obtained by Vickers microhardness tester. In addition, marginal leakage was assessed by using methylene blue dye penetration test.
Results of this study revealed a significant difference in DC values of each packing technique between different storage periods. DC% values were in the order: (Month> 7 days > 24 hours). FB-I showed DC values which were significantly higher than other packing techniques. No significant difference in DC values of FS-I and FB-B. For FB-I, there was no significant difference in DC between different curing times, while for other packing techniques the difference was significant. FS-I showed significantly higher DC with 40 seconds curing time more than other curing times. While for FB-B, DC of all curing times showed to be significantly different from each other with the order of 40>30>20 seconds.
In the current study, the elution of (HEMA, TEGDMA, UDMA and Bis-GMA) monomers was measured. Results of the current study revealed that the quantity and rate of elution varied significantly between different monomers. The monomers eluted in variable quantities in the order (HEMA>UDMA>Bis-GMA>TEGDMA). Packing technique, curing time, storage period and the interaction between them have a significant effect on the amount of eluted monomer. Storage period had a significant effect on the amount of eluted monomers from all packing techniques utilized. In all groups, there was a significant drop of the value of eluted monomers after 7 days followed by a significant increase after 30 days, except for TEGDMA in FB-I and FB-B groups.
The specimens were prepared and divided according to the packing technique used into 3 different groups; Filtek Supreme composite incrementally packed (FS-I), Filtek One Bulk fill composite incrementally packed (FB-I), and Filtek One Bulk fill composite bulk packed (FB-B). Each group was further subdivided into 3 subgroups according to the curing time into 20 seconds, 30 seconds, and 40 seconds groups. For degree of conversion and monomer elution tests, the specimens were measured at different storage periods: 24 hours, 7days and one month.
The degree of conversion was evaluated using ATR-FTIR spectrometer, while monomer elution test was performed using HPLC machine. Depth of Cure (DoC) values were obtained by calculating bottom/top hardness number ratios obtained by Vickers microhardness tester. In addition, marginal leakage was assessed by using methylene blue dye penetration test.
Results of this study revealed a significant difference in DC values of each packing technique between different storage periods. DC% values were in the order: (Month> 7 days > 24 hours). FB-I showed DC values which were significantly higher than other packing techniques. No significant difference in DC values of FS-I and FB-B. For FB-I, there was no significant difference in DC between different curing times, while for other packing techniques the difference was significant. FS-I showed significantly higher DC with 40 seconds curing time more than other curing times. While for FB-B, DC of all curing times showed to be significantly different from each other with the order of 40>30>20 seconds.
In the current study, the elution of (HEMA, TEGDMA, UDMA and Bis-GMA) monomers was measured. Results of the current study revealed that the quantity and rate of elution varied significantly between different monomers. The monomers eluted in variable quantities in the order (HEMA>UDMA>Bis-GMA>TEGDMA). Packing technique, curing time, storage period and the interaction between them have a significant effect on the amount of eluted monomer. Storage period had a significant effect on the amount of eluted monomers from all packing techniques utilized. In all groups, there was a significant drop of the value of eluted monomers after 7 days followed by a significant increase after 30 days, except for TEGDMA in FB-I and FB-B groups.
Other data
| Title | Degree of Conversion, Monomer Elution, Depth of Cure and Marginal Leakage of a Bulk Fill Composite | Other Titles | درجة التحول البلمري و إنبعاث المونمرات و درجة عمق المعالجة الضوئية و التسريب الحافي لمادة الراتنج المركب المحشو بالكتله | Authors | Tarek Mohamed Elshazly | Issue Date | 2019 |
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