OBJECTIVE: To evaluate the compressive strength of resin composites cured with a QTH lamp & LED unit at different exposure time. STUDY DESIGN: In Vitro Experimental study METHODOLOGY: Two composite materials were used in this study. Filtek Z250, (3M ESPE Dental products) and Filtek P60 (3M ESPE Dental products). For each composite 114 disc shaped samples were prepared (5mm in diameter and 2mm in thickness) by using stainless steel mold. The mold was packed with the bulk of resin composite by incremental technique. Each sample was cured through the polyester strip with either QTH unit or LED unit depending on samples grouping. Samples were irradiated for 20, 30 and 40 seconds. Nineteen specimens were prepared for each experimental group. Specimens were placed in artificial saliva for 24 hours after curing. Compressive strength was then determined in universal Instron Testing Machine. Data was analyzed by factorial design by Three Way ANOVA and post hoc Tukeys HSD test. Units RESULTS: Halogen light curing unit is more effective then LED unit in terms of compressive strength. Compressive strength was influenced by exposure time (20, 30 or 40 s) (p<0.001), by curing lights (QTH or LED) (p<0.001) and by resin composite (Filtek Z250 or ZP60) (p<0.001). CONCLUSIONS: The compressive strength of specimens cured with a QTH and a LED curing light was influenced by the curing unit and the chemical composition of the material. The study concluded that superiority of LEDs over halogen lamps is questionable with different composite resins.

OBJECTIVES Patients with the low-dose long-term aspirin regime have a severe risk of excessive bleeding during surgery, placing them at risk of "adverse thrombotic events". This study aims to evaluate the bleeding in patients undergoing minor oral surgery procedures without stopping daily low-dose aspirin therapy. METHODOLOGY A descriptive cross-sectional hospital-based investigation involved the patient with minor oral surgery at "Altamash Institute of Dental Medicine, Karachi, Pakistan" from mid-April 2021 to mid-June 2021, who were between the age group 30 to 75 with a low-dose aspirin regime. The data was collected via a questionnaire to record the variables, i.e. duration of aspirin, postoperative medications, platelets count, clotting time, normal bleeding time, and intraoperative bleeding time.  RESULTS 51 patients, of which 32 were males while 19, were females. The normal bleeding time was comparatively analyzed with the intraoperative bleeding time using SPSS statistical software version 22. The results revealed that the mean bleeding time for the patients with a low-dose aspirin regime during minor oral surgery was 5.49 ± 1.07, while for the patients with a stopped aspirin dose was 4.57 ± 1.07. The comparative analysis using a t-test doesn't reveal significant statistical differences of p<0.05 between both groups. CONCLUSION We concluded that minor oral surgical procedures could safely be done without altering or stopping the low-dose, long-term aspirin regime.