Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 2 2014 04 15 210 5 Abbas Monzavi Associate Professor, Laser Research Center of Dentistry (LRCD), School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. Sima Shahabi Associate Professor, Laser Research Center of Dentistry (LRCD), School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. Reza Fekrazad Associate Professor, Laser Research Center in Medical Sciences (LRCMS), AJA University of Medical Sciences-Laser Research Center of Dentistry (LRCD), School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. Roohollah Behruzi Postgraduate student, department of endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. Nasim Chiniforush PhD Candidate of Laser Dentistry, Laser Research Center of Dentistry (LRCD), School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. 2015 10 16 Peri-implantitis is one of the most common reasons for implant failure. Decontamination of infected implant surfaces can be achieved effectively by laser irradiation; although the associated thermal rise may cause irreversible bone damage and lead to implant loss. Temperature increments of over 10ºC during laser application may suffice for irreversible bone damage.The purpose of this study was to evaluate the temperature increment of implant surface during Er:YAG laser irradiation with different cooling systems.Three implants were placed in a resected block of sheep mandible and irradiated with Er:YAG laser with 3 different cooling systems namely water and air spray, air spray alone and no water or air spray. Temperature changes of the implant surface were monitored during laser irradiation with a K-type thermocouple at the apical area of the fixture.In all 3 groups, the maximum temperature rise was lower than 10°C. Temperature changes were significantly different with different cooling systems used (P https://fid.tums.ac.ir/index.php/fid/article/view/517 https://fid.tums.ac.ir/index.php/fid/article/download/517/493