Evaluation of the effectiveness of cooling by cryosurgery in cat's inflamed pulp anesthesia Dr. S. Moradi* - Dr. A. Talati* - Dr. H. Hassanabadi** - Dr. P. Ghaziani*** - Dr. M. Ehsani**** *-Assistant Professor of Endodontics Dept. – Faculty of Dentistry – Mashhad University of Medical Sciences. **- Assistant Professor of Phisiotherapy Dept. – Faculty of Medicine – Mashhad University of Medical Sciences. ***- Associate Professor of Endodontics Dept. Faculty of Dentistry – Mashhad University of Medical Sciences. ****- Endodontist. Background and Aim: Pulpitis is the most important clinical problem in anesthesia for root canal treatment procedures. The application of cold is a traditional method for localized anesthesia in soft – tissue surgery. The aim of this study was to investigate the effects of cold (cryosurgery) and the combination of it with lidocaine – epinephrine for localized anesthesia in root canal treatment of inflamed pulps. Materials and Methods: In this experimental study, electrophysiological method was used to record the nerve response with nerogram waves in 16 pulps of cat which were stimulated with cold. For pulp inflammation, right and left canine teeth of mandible were exposed to oral cavity for 3 days then using surgical flap method, bone was excised and inferior alveolar nerve made available. Recording electrodes were places on inferior alveolar nerve and stimulator electrodes were put on canine teeth. Electrical stimulation was done basically without any intervention, after cryosurgery for cold effects and after lidocaine – epinephrine injection in mental foramen of mandible. All response waves were recorded. Waves were analyzed concerning latency and duration using ANOVA test Results: Differences in latency and duration, without intervention and after cold between two groups were not statistically significant (P=0.97). The difference between basic response and after lidocaine – epinephrine injection response was significant (P<0.05) meaning that lidocaine – epinephrine reduced nerve response significantly. Conclusion: In pulp – inflamed teeth, cold decreased nerve response which was not statistically significant. Post cryosurgery lidocaine – epinephrine injection made irresponsible nerve in 81.3% of cases showing the ability of cold in local anesthesia of pulp inflamed teeth. Key words: Pulpitis – Cryosurgery – Anesthesia - Lidocaine | 
