What is the difference between ultrasonic dental cleaner and dental scaling during professional dental cleaning ? which one is better ?

Cavitation / scaling: The ultrasonic cleaner uses a high frequency vibrating tip, irrigated with water, to break apart encrusted calculus and kill bacterial cells by bursting their cell walls with the kinetic energy. Scaling removes the same calculus by scraping it off, and planning the root surface to a glass-like finish. What is better for you depends on accumulations and periodontal status. Talk to your dentist.

More importantly....: First, it is more the expertise and diligence of the dentist or hygienist than which instruments are used to scale, root plane\clean hard deposits off tooth structure. Dr. Davantzis explained the actual differences already. Both can work equally well. Different clinicians have their own preferences. Both are often used in conjunction for best results.

Ultrasonic vs hand: scalers - which are better? Research shows power scaling and hand instruments have advantages and disadvantages. The consensus is the best results for dental cleaning are achieved by a combination approach of power ultrasonic scalers and hand instruments.