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Transverse test is considered to be appropriate for polymeric dental materials since compression and tension stresses are correlated to specific fractures that occur during flexural load. So the aim of the study is to evaluate the transverse strength of heat cured acrylic denture base material by using different surface treatment by laser treatment with diodes laser and air-abrasion AL2O3. The 60 specimens of heat cured acrylic denture base material were prepared for this study. They were divided into three groups according to type of the surface treatment and as follows: first group without any treatment (control group), second group is treated with air-abrasion (AL2O3). While third group is treated with Diodes laser, then each group subdivided into two groups according to addition of the soft liner: group a: specimens made from heat cured acrylic and soft liner, while group b: specimens made from heat cured acrylic only, each group consisted from 10 specimens. The results showed lowest mean values of the transverse strength for the control group than the specimens with AL2O3 group, and the highest mean values of diodes laser group but statically there was non-significant difference between the groups. In addition the mean values transverse strength of the soft liner bonded to the heat cured acrylic were higher mean than those without soft liner groups. Within the limitation of this study, there was no change in the transverse strength of the heat cured acrylic by using the diodes laser and air-abrasion AL2O3 surface treatment. https://doi. org/10.25130/tjds. 4.2. 3