Al-Zuhair, Nohoud2018-10-312018-10-311975197516017255b14337873https://hdl.handle.net/2144/31713PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.Thesis (M.Sc.D.)--Boston University, School of Graduate Dentistry, 1975. Periodontology.Bibliography included.Numerous investigations have been carried out in attempt to inhibit calculus formation. Many different materials and methods have been utilized for this purpose. This investigation was designed to test the effect of a material which had been used before (sodium hexametaphosphate); however, in our study this material for the first time was combined with magnesium chloride to prevent the tooth from being affected. The sodium hexametaphosphate action, therefore, was restricted to the forming calculus. The product tested was a significant adjunct in controlling calculus formation; however, it showed no effect on the rate or amount of dental plaque formeden-USThis work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.Dental plaqueThesis/Dissertation99175049140001161