Toplinski učinak C 0 2 lasera na tvrda zubna tkiva i amalgamske ispune Ivica

Effects of temperature changes on extracted human teeth, amalgam surface and during ablation of cervical caries produced by C02 laser irradiation were examined. On extracted molars, the bottom of occlusal class I preparations were with output power of 3 W for 5 and 10 s. Temperature elevations recorded at crosssection surface of the holes of 3 mm in diameter, previously prepared on buccal surface toward pulp chamber, were between + 7.3°C and temperatures which were beyond the calibration range (>50°C) of the thermovision device. On non-polished amalgam class 11 restorations, laser power of 1 W for 3 s, measured at impact points, produced immediately after lasing a maximal rise in temperature higher than 50°C (>+15°C), beyond the camera calibration range. The same temperature rise was recorded after ablation of cervical caries with laser power of 2 W for 5 s.U radu je ispitivan temperaturni učinak C02 lasera na zubno tkivo i amalgam. Dno okluzijskog kaviteta I. razreda kod 40 trajnih zdravih molara obasjano je s 3W kroz 5 i 10 sekundi. Promjene temperature mjerene su bukalnoj caklini, površini korijena i, indirektno, u pranoj pulpnoj komorici. Nakon obasjavanja, u pulpnoj komorici temperatura je porasla za najmanje +7.5°C do više od 20°C. Nakon obasjavanja troplošnoga amalgamskog ispuna na molarima snagom od 1W kroz 3 s, na ciljanu mjestu temperatura je porasla za više od 15-20PC. Samo 0,5 sekundi kasnije, temperatura je bila povišena za +5.7°C. Isti porast temperature izmjeren je i nakon fotoablacije cerviksnog karijesa na ekstrahiranim očnjacima, ali je hlađenje bilo znatno sporije