Polymerization Polymers are long chains of large high-molecular weight macromolecules. They are formed by a chemical reaction where a large number of smaller units or monomers join to form polymer macromolecules, a process called polymerization. Elastomers are liquid polymers which can be converted to solid rubber at room temperature. By mixing with a suitable catalyst, … [Read more...] about Polymerization In Dentistry Notes
Dental Materials
Silicone Rubber Impression Materials in Dentistry
Silicone Rubber Impression Materials These materials were developed to overcome some of the disadvantages of polysulfide materials, such as their objectionable odor, the staining of linen and clothing by the lead dioxide, the amount of effort required to mix the base with the accelerator, the rather long setting times, the moderately high shrinkage on setting, and the fairly … [Read more...] about Silicone Rubber Impression Materials in Dentistry
Polysulfides In Dentistry Notes
Polysulfides This was the first elastomeric impression material to be introduced (1950). It is also known as Mercaptan or Thiokol. Interestingly, they were first developed as an industrial sealant for gaps between sectional concrete structures. Polysulfides Supplied As They are supplied as a two-paste system in collapsible tubes. The base paste is white colored. The … [Read more...] about Polysulfides In Dentistry Notes
Additive Manufacturing In Dentistry Notes
Classification Of 3D Printing Technologies In Dentistry Additive manufacturing is finding increasing use in dentistry. More popularly known as ‘threedimensional printing’, it is an additive manufacturing process in contrast to conventional CAD/ CAM which is a subtractive process. The first 3D printer was invented by Hideo Kodama of Nagoya, Japan. In 1984, Chuck … [Read more...] about Additive Manufacturing In Dentistry Notes
Denture Resins And Polymers Notes
History Of Dentures Replacements for decaying or lost teeth have been made for thousands of years. Skillfully designed dentures were made as early as 700 B.C.E using ivory and bone. During Medieval times, dentures were seldom considered. Gaps between teeth were expected, even nobles had them. Queen Elizabeth, I filled the holes in her mouth with a cloth to … [Read more...] about Denture Resins And Polymers Notes