Al-Azhar University, Egypt
Title: Effect of environmental pressure changes simulating scuba diving on microleakage of zirconia restorations - An in vitro study.
Dr. karim sherif adly is an assistant lecturer in Crown and Bridge Department, Faculty of Dental Medicine, Al-Azhar University. (Cairo-Boys).he get PHD in 2019.he is the founder of scuba diving relation to dental health.he has a big vision in this aspect. Dr. karim recived BDS in 2009 and MDS in 2015. Dr. karim continued his research in CAD/CAM and digital dentistry.he continued his researches in Faculty of Dental Medicine, Al-Azhar University.
Purpose: evaluation of effect of environmental pressure changes simulating scuba diving on microleakage of zirconia restoration. Autonomous diving, also known as SCUBA (Self Contained Underwater Breathing Apparatus) diving, was developed in the 40’s. When mentioning the term SCUBA, in general an open circuit equipment is meant, although this term also comprises closed circuit equipment with re-inhalation, which use carbon dioxide filters. Despite the fact that diving with a pressurized air tank has been the subject of study for more than seventy years, there are still unknown aspects about it. Methods: A total of forty-eight zirconia monolithic crowns cemented to natural teeth were used in the study. The samples were assigned to three equal groups (n=16 each) according to environmental pressure change. 1 bar: 3 bar: 5 bar: Each group was divided into two subgroups (n=8), according to the type of luting cement used Subgroup PANavia f 2.0,Subgroup rely x unicem. Results: Irrespective of cement, totally it was found that the highest mean ± SD values of Leakage were recorded for 5 Bar subgroup (14.163±3.9%) followed by 3 Bar subgroup mean ± SD values (10.243±2.3%) meanwhile the lowest mean ± SD value was recorded with Control subgroup (3.1084±1.3%). The difference between groups was statistically significant as indicated by one way ANOVA followed by Tukey’s pair-wise post-hoc test (F=84.8, P=<0.0001<0.05).Conclusion: The environmental pressure changes affect the microleakage of translucent monolithic zirconia.