Dental composite resins (better referred to as "resin-based composites" or simply "filled resins") are types of synthetic resins that are used in dentistry as restorative material or adhesives. Dental composite resins have certain properties that will benefit patients according to the patient's cavity. It has a micro-mechanical retention property that makes composite more effective for filling small cavities where amalgam fillings are not as effective and could therefore fall out (due to the macro-mechanical retention property of amalgam). Synthetic resins evolved as restorative materials since they were insoluble, of good tooth-like appearance, insensitive to dehydration, easy to manipulate and reasonably inexpensive.
A "root canal" is not a treatment, but part of a tooth. It is the hollow section of a tooth that contains the nerve tissue, blood vessels, and other cells, also known as the pulp. A tooth consists of a crown and roots. The crown is mainly above the gum, while the roots are below it. The roots attach the tooth to the jawbone. Inside the crown and the root, or the root canal, is the pulp. The pulp nourishes the tooth and provides moisture to the surrounding material. The nerves in the pulp sense hot and cold temperatures as pain. The name of the dental procedure commonly referred to as a "root canal" is actually endodontic therapy, which means "inside the tooth." However, the term "root canal" has come to be commonly used to talk about the procedure.
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