Compression strength of single fill composites

Vol. 12 – Number 46 – 2021 CLINICAL DENTISTRY NOTEBOOK Original article Page 118-123 Compression strength of single fill composites Ricardo Huver de Jesus1 Pâmela Rodrigues Pires2 Raquel Cavallini Silva2 Suyanni Chieppe dos Santos Manfioletti2 Carlos Frederico Bettcher Silva2 Lucas Campagnaro Maciel3 Abstract A new class of composite resins called single fill resins (Bulk-Fill) was proposed to simplify restorative procedures. They allow filling dental cavities in layers of approximately 4mm. This study aims to compare the compression strength of single fill composites with different polymerization times. Four Bulk-Fill composites were used Filtek Bulk-Fill, Filtek Bulk-Fill Flow, Tetric N-Ceram Bulk-Fill, and Tetric N-Flow Bulk-Fill, and also a conventional composite Filtek Z350 XT as a control group. One hundred cylinders were manufactured in a matrix with 4.7mm diameter and 4mm height for Bulk-Fill compounds, and 2mm height for the control group. Half of the specimens of each material was photopolymerized for 10 seconds and the other half for 20 seconds (n = 10). The samples were stored in distilled water for 48 hours at 37°C and subjected to compression testing in a universal test machine. Variance analysis was performed with t-test of multiple comparisons between groups and student t-test for the different polymerization times with significance index p=0.05. The results did not show statistically significant difference in relation to polymerization time. However, there was a statistically significant difference between the control and Filtek Bulk-Fill Flow groups, which presented higher strenght to compression than the Filltek Bulk-Fill, Tetric N-Ceram Bulk-Fill, and Tetric N-Flow Bulk-Fill groups. The type of resin can influence its resistance to fracture. The polymerization time did not have any influence in the materials strength. Descriptors: Composite resins, material resistance, polymerization. ¹ Me. In Dentistry – UVA, Postgraduate Program – Doctorate – SL Mandic, Prof. of the Dentistry course – Faculdade MULTIVIX. ² CD – ESFA. ³ Dr. in Dental Prosthesis – UNITAU, Me. In Dental Clinic – UFES, Prof. of the Dentistry course – Faculdade MULTIVIX. DOI: 10.24077/2021;1246-118123