In vitrocalculus detection with a moved smart ultrasonic device
: Blackwell Synergy
Study objective: The objective of subgingival instrumentation of periodontally
diseased root surfaces is to remove the adhering microbial biofilm and calcified
deposits. Recently, we have described an automated calculus detection system under
static conditions. Clinically however, the tip of the system has to be moved over tooth
surfaces. It was thus necessary to study the entire system in motion.
Methods: The detection device is based on a conventional dental piezoelectric
ultrasonic handpiece with a conventional scaler insert. The impulse response of the
mechanical oscillation system is analysed by a fuzzy logic-based computerized
algorithm, which classifies various surfaces. The present study investigates dental
surface recognition properties of the new system with the tip being moved over teeth
surfaces in vitro. Following a training set of 7977 measurements (3960 calculus, 4017
cement) on 200 extracted teeth, 1363 measurements were conducted on 34 teeth
unknown to the system.
Results: The surfaces cementum and calculus were correctly classified in 78% within
the training set and in 81% within the set unknown, with a k value of 0.68.
Conclusion: It was shown that this method of automatic recognition of tooth surfaces
is able to distinguish between different tooth surfaces in vitro independently from tip
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