ABSTRACT
THE PURPOSE OF THE STUDY: determination of the optimal parameters of the action of various types of current, which have the most pronounced irritating effect on the receptor apparatus of the tooth pulp. The study involved 102 volunteers aged 19 to 72 years (53 females and 49 males). The study was conducted on 217 teeth: 86 molars, 25 premolars, 19 canines and 98 incisors. 137 (63%) teeth were intact, in 48 (22%) teeth caries were found, in 32 (15%) teeth there was pulpitis or teeth were depulpated. Electroexcitability of the teeth was determined with the help of various types of electric current: an impulse variable, an impulse constant and a sinusoidal variable. The optimal current for carrying out an electroodontodiagnosis proved to be sinusoidal variable current with a frequency of 50 Hz. This current does not cause polarization of tissues, it is easy to dose, it causes a clear, but not painful sensation, gives the smallest spread of the indicators during repeated studies. The obtained results allowed formulating requirements for electroodontodiagnosis devices.
Subject(s)
Dental Caries , Dental Pulp , Electric Stimulation , Pulpitis , Adult , Aged , Bicuspid , Dental Pulp/physiopathology , Female , Humans , Male , Middle Aged , Molar , Pulpitis/diagnosis , Young AdultABSTRACT
Objective To find out a quick,simple and convenient method of determining the viability of Oncomelania hupen-sis. Methods O. hupensis snails were stained for 30 minutes by 0.05%water soluble dye neutral red,0.5%methylene blue,red ink,methylene blue-eosin-borax(MEB)and 0.4%trypan blue,respectively. The soft tissue samples of the snails were observed by a stereoscopic microscope after crushing their shells. Results The vital snails were stained and the dead were unstained in the neutral red. The vital and dead snails were unstained in methylene blue. However,the vital and dead snails were stained in red ink. The partial vital and dead snails were stained in MEB. The vital snails were stained and the partial dead were stained in trypan blue. Conclusion The use of 0.05%water soluble dye neutral red is simple,rapid and accurate in determination of the viability of O. hupensis.
