Strength and limitations
PD
This study was conducted as an RCT. A pre-study calibration exercise and proper training in the use of the latest version of the air-polishing device were performed. The statistical power of study was estimated to 89%. Included patients were block randomized to either test or control treatments to ensure an equal number of patients in each group prohibiting the occurrence of systemic differences between treatment groups [We acknowledge that the present RCT is not exempt from limitations. PD was measured without removing the prosthetic restoration since both cemented and screw-retained fixed prosthesis were included. This may affect clinical assessments, especially in the posterior area [