RESUMO
A new method is presented using an optical particle counter and the compact mobile laser mass spectrometer LAMPAS 3 for in situ analysis of single particles generated by electrosurgical dissection of biological tissues. The instrumental performance is demonstrated for analysing aerosol particles formed during rapid thermal evaporation of porcine liver and porcine kidney tissues. Particle number concentrations of up to 5,000 particles per cubic centimetre were detected during surgical dissection. Chemical analysis of tissue particles was performed by bipolar time-of-flight mass spectrometry. The application of an online mass spectrometric particle analysis for surgical aerosols is reported here for the first time.
Assuntos
Aerossóis/análise , Dissecação , Espectrometria de Massas/métodos , Animais , Bovinos , Rim/química , Fígado/química , Espectrometria de Massas/instrumentação , Suínos , VolatilizaçãoRESUMO
Radicular surfaces connected with the bone by the periodontal membrane were measured by means of a galvanic method. The investigation showed that the surface reduction as a function of the length of the root cannot be compared with the surface reduction of a cone, since at least in the coronal quarter of the root, the percent decrease in surface is linear, especially in the case of teeth with several roots. The clinical significance of this investigation becomes evident when evaluating the bone destruction visible in a radiogram related to loading capacity. In the author's investigation an average loss of 60% was found.
