Sandblasting with Al2O3 Powder in Dental Medicine
Minimally invasive dental medicine is a novel trend, increasingly accepted by many practitioners and extension for prevention has gradually been abandoned, being replaced by increasingly conservative interventions. Air Abrasion was developed in 1945 by RB Black who started to investigate alternative pseudo-mechanical methods for the removal of dental tissue by bombarding it with a high-speed particulate flow: aluminium oxide. In the present study, we used 14 teeth extracted for orthodontic purposes or due to periodontal disease. We only selected teeth with early carious lesions (cavitary or non-cavitary), located proximally, cervically or on the occlusal surfaces of pits and fissures. Teeth were sandblasted with the RONDOflex plus (KaVo) equipment which uses the principle of hydro-sandblasting (water sandblasting) 50 mm powder. In the most cases the incipient proximal, cervical or occlusal carious processes were successfully removed, resulting in a small cavity, with bevelled margins and with the surface conditioned for composite application. In two cases, the carious process was only partially removed by Air Abrasion which showed the ineffectiveness of sandblasting in cases where the removal of healthy dental hard tissue needs to be removed. For the complete removal of the carious process, cavity preparation with the diamond drill was required, or, alternatively, opening the occlusal relief with the turbine, followed by sandblasting.