Aim: To evaluate the flexural strength of various provisional crown and fixed partial denture resins with and without glass fiber reinforcement using in-vitro testing system. Settings and Design: Total of 60 sample specimens were made of 35mm X 2mm X 2mm dimensions. Two groups were made- Group 1 ‗without glass fibres‘ and Group 2 ‗with glass fibres‘. Each group included three subgroups- Subgroup A ‗PMMA‘, Subgroup B ‗Protemp‘ Subgroup C ‗Cooltemp‘. All subgroups included ten specimens each. Methods and Material: The fiber-reinforced specimens were made, resin applied on top of fibers. these were placed in the bottom side of the mould cavity; mould placed between two glass slabs and weight was applied over. The specimens were stored in distilled water for 10 days. A 3-point bend test was carried out in universal testing machine. The force was applied on specimens at resin side until Breaking Point. Data obtained of force at fracture was recorded in MPa and tabulated. Statistical analysis used: . Data were summarised as Mean ± SE. Groups were compared by two factor (fibers and resins) analysis of variance (ANOVA). and the significance of mean difference within (intra) and between (inter) the groups was done accordingly. Analysis on SPSS software Results:  Protemp with glass fiber reinforcement is best suitable provisional crown and fixed partial denture resin followed by cooltemp with glass fiber reinforcement followed by PMMA with glass fiber reinforcement. Conclusions: Flexural strength is an important factor while choosing provisional crown and bridge materials.