Mechanical removability mastic

Attrition is the mechanical removal of hard tissue by direct contacts between teeth (either natural or restored) with no foreign substance intervening [5]. This mechanism causes wear by tooth-tooth contacts as well as by tooth-restoration, and indeed restoration-restoration contacts. The action of mastication and bruxism are known causes of attrition. In the field of tribology, the term abrasion refers to the loss of material from a surface by sliding, rubbing or scratching. Two-body abrasion refers to abrasion caused by two contacting surfaces in relative motion, i.e. the mechanism in dentistry that is described as attrition. Three-body abrasion refers to abrasion caused by surfaces in... 

A solution of 21 g of SDS in 700 mL of deoxygenated water was prepared. N-4-Butylphenylacrylamide (0.444 g) was dissolved in this solution followed by 20.6 g of acrylamide. The resulting solution was carefully transferred to a 1-L Morton-style resin kettle fitted with a chilled water condenser, thermometer, inert gas sparger, and mechanical stirrer. The temperature was adjusted to 50 °C and polymerization was initiated by the addition of 1.47 mg of K2S2O8. After stirring for 1.5 h at 50 2 C, a 100-mL portion of the viscous solution was poured slowly into 3 L of methanol. The precipitated polymer was then masticated in with methanol in a blender (Waring), filtered, and dried under vacuum at 30 °C. The yield of polymer was 0.86 g (28.7%). After 16 h, the solution was diluted with 600 mL of distilled water and a 200-mL ahquot was removed. The polymer was isolated to yield 2.94 g (98.0%). 

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