I

implant
a titanium cylinder surgically placed in the jawbone to replace the root of a missing tooth

incisors
the four upper and four lower front teeth

infiltration
process for numbing the upper teeth by placing anesthetic liquid under the gum tissue and allowing it to migrate into the bone

inlay
filling that is prepared extraorally in the dental laboratory and cemented into place by the dentist; it is often used when the cavity is too large to be restored by a direct filling, but not so large that a crown would be necessary

intraoral
inside the mouth

intraoral camera
a very small TV camera used to view tissues of the mouth