[Lasers in dentistry 8. Use of lasers in oral and maxillofacial surgery].

Since the 1970's lasers are used in oral and maxillofacial surgery. The effect of a laser on tissue is determined by the wavelength of the laserlight and the tissue specific absorbtion. Lasers are used for evaporation, excision and coagulation of tissue. The CO2-laser, the Nd:YAG-laser and the Argonlaser are used for these purposes. Light and laserlight are used for the diagnosis of mucosal lesions. By using different excitation wavelength autofluorescence of lesions can be detected and analysed. An artificial neural network can be used to analyse these data. Photodynamic Therapy (PDT) is a cancer therapy based on the more or less specific absorption of a drug in tumour, that can be activated with light of a specific wavelength. Activation of this drug causes tumour destruction due to the formation of oxyginradicals. PDT is limited by the penetration of the activating light and is therefore only suitable for the treatment of superficial tumours.