ABSTRACT
The temperature and pump power dependence of infrared luminescence of Cr(4+):forsterite are measured. It is demonstrated that temperature-dependent fluorescence in Cr(4+):forsterite is the major reason for saturation of the output power of a continuous-wave laser. At higher pump intensities the temperature rise inside the crystal becomes significant, and even outside cooling does not help to prevent significant reduction of the laser performance. These measurements serve as a guideline to construct a high-power continuous-wave Cr(4+):forsterite laser.
ABSTRACT
Saturation of near-infrared absorption in Mg(2)SiO(4):Cr is observed, and the absorption cross section at 1.08 microm is estimated to be sigma(alpha) = (2.3 +/- 0.3) x 10(-18) cm(2). Q switching and passive mode locking of a Nd:YAG laser have been realized with a Mg(2)SiO(4):Cr saturable absorber.
ABSTRACT
Conservative and surgical methods are used to treat chronic dislocations of the temporomandibular joint. Different techniques described in the literature are discussed. 8 cases treated by eminectomy are presented and the results are evaluated.
Subject(s)
Joint Dislocations/surgery , Temporal Bone/surgery , Temporomandibular Joint/injuries , Adult , Chronic Disease , Female , Humans , Male , Methods , Middle Aged , Recurrence , Temporomandibular Joint/surgerySubject(s)
Dental Occlusion , Jaw Relation Record , Adult , Dental Equipment , Dental Instruments , Humans , Models, Biological , PlasticsABSTRACT
The effectiveness of topical sodium fluoride applied with and without iontophoresis was compared in patients complaining of tooth hypersensitivity. Reduction of sensitivity to cold and mechanical stimuli was evaluated during a period of 8 months by pain scoring in the exposed cervical dentin of homologous teeth on the two sides of the jaws. There was a significant decrease in the sensitivity of the exposed cervical dentin after treatment with sodium fluoride solution, with or without iontophoresis, during the whole experimental period. There was no striking difference between the two forms of treatment with respect to the reduction of sensitivity to mechanical and cold stimuli.
