RESUMEN
Exposed root surfaces cause esthetic problems and hypersensitivity to thermal and tactile stimuli. Plastic surgical treatment solves these problems and yields good permanent results. The authors share their experience of the treatment of 30 patients with 186 gingival recessions localized in the lower and upper jaws, frontally and premolarly. The clinico-biometrical studies conducted over a period of 3 to 15 years showed a mean root coverage of 88.48% and in 17 patients the root coverage is 100%. The applied method can successfully deal with multiple gingival recessions in only two visits preserving the periodontium of the adjacent teeth. The surgical technique and the results of its application are illustrated by the results of well-documented cases.
Asunto(s)
Recesión Gingival/cirugía , Adolescente , Adulto , Femenino , Humanos , Masculino , Mandíbula , MaxilarRESUMEN
The tradition in tritium washout modeling is to unite the washout model with a Gaussian plume model describing dispersion of tritium vapour in the atmosphere. In the present study, an alternative approach is proposed. A numerical Eulerian model that describes washout independently of dispersion is developed. The sensitivity analysis to model parameters has shown that the washout process is influenced most significantly by rainfall parameters and air temperature: different raindrop size distributions cause differences of up to about 70% in the washout outputs; a change of 15°C in the air temperature causes an effect of about 50%. Results are presented showing calculated values of washout outputs (tritium concentration in rain, tritium downward flux, washout coefficient) for different tritium vapour profiles, rainfall rates and air temperatures. The general conclusion is that the washout process is too complex to be described comprehensively by the simple washout coefficient concept. We suggest the approach proposed here for directly calculating the tritium downward flux and concentration in the rainwater is preferable.