Dr. Hassan is Professor of Operative Dentistry and Senior Clinical Consultant at Global Dental Research Centre in Vancouver, British Columbia in Canada. Dr. Hassan introduced 3 innovative restorative techniques for controlling the detrimental effects of composite shrinkage stress in 1987, 2005 & 2021. The 1st entitled: “The Modified Incremental Filling Technique for Class II Composite Restorations” & published in Journal of Prosthetic Dentistry. The 2nd entitled “The Split-increment Horizontal Layering Placement Technique for Class I Composite Restorations" & published in General Dentistry. The 3rd entitled: "Semi-Split Bulk Filling Technique in Large Occlusal Bulk-Fill Resin Composite Restorations " & published in Journal of Oral Medicine and Dental Research.