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Introduction: The application of thermovision in endodontics is an innovative method and has a great informative value, evidence proved, thanks to the use of last generation camera Flir A310 and a software ThermaCam Reporter 8.3 Pro. In the recent years a new method of root canal disinfection is introduced – photo-activated disinfection (PAD). Temperature increase have always been a concern during dental laser treatment. Aim: The purpose of our study is to evaluate the temperature elevation on the outer root surface at extracted teeth and in periapical tissues when photodynamic therapy with 630-nm diode laser is used for root canal disinfection. Materials and methods: For the laboratory study we used 72 single-rooted freshly extracted human teeth. They were divided into six groups depending on the power of the light source (220 mW, 360 mW and 500 mW ) and the type of photosensitizer agent - Fotosan and Zn-phtalocianine. In our clinical study participated 8 patients, who came in to our clinic with complaints of spontaneous pain or were with infected root canals and were referred for endodontic treatment. PAD was performed with a diode laser with wavelength of 630 nm using an endodontic handpiece with fiberoptic connector, allowing penetration to 4 mm from the apical stop, and movements of fibreoptic (200 µm) in apicalcoronal direction . Results: The highest temperature value was detected at 500mW and 360mW. The average temperature increase recorded in our study at the external surface of the root canal did not exceed 10°C only at power setting of 220 mW during PAD with Zn-phtalocianine. Conclusion: In conclusion, photo-activated disinfection of the root canal with Zn-phtalocianine and 630-nm diode laser using 200 µm fibreoptic tips at a power setting of 220 mW for 60 seconds induces a temperature increase which isn’t sufficient to damage the neighbouring tissues. Based on this results we don’t recommend root canal preparation over 02 or 04 taper when PAD will be performed.

The teeth and teeth rows restoration in the maxillofacial area is the last stage of the ongoing patient treatment and a basic purpose for the dental doctors. For this purpose a different set of modern and classic contemporary dental materials is used. The choice of each material during the treatment of every patient with proven allergy to different kind of allergens is very specific and strictly individual. In the everyday oral diagnostics a standardized set of allergens for diagnostics is used for proving the allergy to dental materials. The set has been developed on the base of all existing and permitted by the Bulgarian authorities dental materials, as well as professional series.The difference between the developed and standardized allergens for diagnostics used in our country and the existing ready-for-use series is that the first are made of the final product (material) in the form introduced to the oral cavity and persisting there for a different period of time, sometimes for tenths of years. This enables the possibility for early or late contact allergic reactions with symptoms in the oral cavity and on the skin, maxillofacial area, head and neck, as well as the entire organism.The current article introduces the readers to the results obtained by the realization of the research project №28/2011 “Research on the type of sensibilisation to contemporary dental materials and development of set of allergens for its diagnosing through epicutaneous patch testing” funded by the Committee of Medical science of MU Sofia (CMC). Through the project became possible the creation and the initial research of the first Bulgarian series for epicutaneous testing whose aim is to prove the allergenic potential of the most frequently used by the dental doctors dental materials.