ABSTRACTObjective:Evaluation of the efficiency of 15 F CO2laser microprobe, in cases of periapical lesions. The elimination of the pathological reaction caused by certain species of bacteria by reduction of reinfection and stimulation of osteogenesis.Summary Background Data:Until now, no suitable delivery fiber existed for CO2laser endodontic radiation in the apical region where it is most difficult to eliminate the pulp tissue using conventional methods. To overcome this problem, Sharplan Lasers designed a microprobe that reaches closer to the apex, distributing the energy density to a smaller area of the root canal, thus favorably increasing the thermal effects.Methods:The study was conducted on 900 teeth, corresponding to 1512 root canals, divided in two groups. Four hundred sixty-eight were new cases, carefully selected according to strict parameters such as wide periapical translucency over 1 mm, supported by digital x-ray, with a lesion of 3 mm and more. All root canals were mechanically prepared in the conventional method up to size 35, Physiological saline solution served as rinsing solution and the root canals were treated by 15 F CO2laser microprobe for 60 pulses repeatedly. The temperature at the surrounding tissue of the root did not exceed 38°C.Results:Filling of the canal was possible at the same appointment, without antibiotic treatment. Four hundred thirty-two of the cases, which were referred to us by other dentists after an unsuccessful treatment according to the classic therapy, were treated by the same laser therapy. Follow-up was performed by clinical examination, and a digital x-ray was taken, during and after treatment as well as after 3, 6, 9, and 12 months.Conclusions:There is a 98 success rate in both study groups, according to objective criteria for successful treatment including reduction of apical translucency after 2–6 months, freedom from clinical complaints, and no need for periapical surge
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