00000ctm a22000003a 4500 UP-1685523046126166560 Buklod 20090112134421.0 a r |||| u| ta 090112s xx d r |||| u| (iLib)UPMNL-00006856172 UPDent eng LG 993.5 2007 D4 F37 Fernandez, Femalyn L. A comparative study on the flexural strengths of composites used as direct core buildup materials Femalyn L. Fernandez, Arlyn A. Lizaso, Armin G. Segarra. viii 29 leaves Seminar Paper--Doctor of Dental Medicine--University of the Philippines Manila. Badly broken down coronal portions of the teeth may still be restorable using direct core build up materials which must possess properties able to resist the strong masticatory forces in addition to be able to retain the final coronal restoration. One of the important mechanical properties is the material's flexural strength which is a combination of its compressive, tensile and shear strength. This study aims to determine if there is a significant difference among the flexural strength of composite marketed as direct core buildup materials (CBCo), and Light cured nanocomposites (LCCo), as direct core buildup materials. One CBCo (Rebilda) and Two LCCo (Grandio and Filtek z350) were evaluated. 10 specimens of each composite materials were prepared in a stainless steel mould with dimensions of 25mm x 2mm x 2mm. They were then subjected to a 3 point bending test with the use of a Universal Testing Machine with a crosshead speed of 0.75mm/min. Results of the study show that there is no statistically significant difference in the flexural strengths of the conventionally light cured nanocomposites and composites marketed as direct core build-ups. Composite materials. Lizaso, Arlyn A. egarra, Armin G. Galban, Angelita B. (Adviser). UPMNL DENT LG 993.5 2007 D4 F37 Thesis