Comparative biomechanical evaluation of plaster of Paris bandage and fibreglass bandage casts under compression testing

In the present study in vitro biomechanical properties of different layer of Plaster of Paris (Group I, n=18) and fibreglass bandage casts (Group II, n=18) were compared. Each group was further divided into three subgroups depending on the number of layers of cast material i.e., 2, 3, and 8 layers (n=6 in each sub group). The casts were subjected to mechanical testing @ 10 mm/min in axial compression. Load-deformation curves were generated and different mechanical parameters were calculated and compared. Fibreglass bandage casts were stronger than Plaster of Paris casts under compression testing. 8 layer casts were stronger followed by 3 and 2 layer casts in both groups. Fibreglass bandage casts were stronger than Plaster of Paris casts, with better handling characters.