TY - JOUR

T1 - Elution of Monomers from Two Conventional Dental Composite Materials

AU - Polydorou, Olga

AU - Trittler, Rainer

AU - Hellwig, Elmar

AU - Kümmerer, Klaus

PY - 2007/12/1

Y1 - 2007/12/1

N2 - Objective: The aim of this study was to determine the elution of monomers of two conventional resin composite materials after different polymerization and storage times. Methods: Two resin composites (a hybrid and a flowable) were used. Four groups (n = 10, diameter: 4.5 mm, thickness: 2 mm) of each material were fabricated, one for each polymerization time of: 0 s, 20 s, 40 s, and 80 s. The samples were stored in 1 ml of 75% ethanol at room temperature, and the storage medium was renewed after 24 h, 7 days, and 28 days. From the storage medium that was removed, samples were prepared and evaluated, with LC-MS/MS. Results: Bisphenol A and UDMA were not detected in the samples. Regardless of the polymerization time, the material or the storage time, a higher amount of BisGMA was eluted compared to TEGDMA. The amount of monomer that was released from the polymerized samples of the hybrid resin composite (Tetric Ceram®) was significantly higher (p <0.0001) compared to the flowable (Tetric Flow®). No significant difference was found between samples polymerized for 20 s compared to 40 s concerning the elution of monomers. Only a polymerization time of 80 s resulted in a decreased release of monomers. The release of TEGDMA decreased after 28 days; however, the elution of BisGMA remained at high levels. Significance: The release of monomers remains at a high level for a long time (7-28 days) after polymerization. The 40 s that are usually used for the polymerization of resin composites seems insufficient in order to prevent a high release of monomers. © 2007 Academy of Dental Materials.

AB - Objective: The aim of this study was to determine the elution of monomers of two conventional resin composite materials after different polymerization and storage times. Methods: Two resin composites (a hybrid and a flowable) were used. Four groups (n = 10, diameter: 4.5 mm, thickness: 2 mm) of each material were fabricated, one for each polymerization time of: 0 s, 20 s, 40 s, and 80 s. The samples were stored in 1 ml of 75% ethanol at room temperature, and the storage medium was renewed after 24 h, 7 days, and 28 days. From the storage medium that was removed, samples were prepared and evaluated, with LC-MS/MS. Results: Bisphenol A and UDMA were not detected in the samples. Regardless of the polymerization time, the material or the storage time, a higher amount of BisGMA was eluted compared to TEGDMA. The amount of monomer that was released from the polymerized samples of the hybrid resin composite (Tetric Ceram®) was significantly higher (p <0.0001) compared to the flowable (Tetric Flow®). No significant difference was found between samples polymerized for 20 s compared to 40 s concerning the elution of monomers. Only a polymerization time of 80 s resulted in a decreased release of monomers. The release of TEGDMA decreased after 28 days; however, the elution of BisGMA remained at high levels. Significance: The release of monomers remains at a high level for a long time (7-28 days) after polymerization. The 40 s that are usually used for the polymerization of resin composites seems insufficient in order to prevent a high release of monomers. © 2007 Academy of Dental Materials.

KW - BisGMA

KW - High performance liquid chromatography

KW - Monomers

KW - Resin composites

KW - TEGDMA

UR - http://www.scopus.com/inward/record.url?scp=35548949750&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/5f6041c7-667f-3787-b752-0453064bffea/

U2 - 10.1016/j.dental.2006.12.011

DO - 10.1016/j.dental.2006.12.011

M3 - Journal articles

VL - 23

SP - 1535

EP - 1541

JO - Dental Materials

JF - Dental Materials

SN - 0109-5641

IS - 12

ER -