Precision measurement control in endodontics.

A technique for measurement control in endodontic therapy is presented. The technique, which involves the use of a 10 mm segment of plastic ruler mounted on the end of a mirror handle, eliminates the inaccuracies associated with rubber stops and other devices used for measurement control. It gives the dentist precision control of instrumentation, which is vital to the development of a dentinal matrix at an optimum position.

C-shaped canal configurations in mandibular molars.

Three cases of C-shaped mandibular second molars are described. These clinical findings were similar for each case:--It was impossible to diagnose the condition on the preoperative radiograph.--All three cases had normal anatomy of the pulp floor and separate canal orifices.--Continuous hemorrhage and sensitivity were encountered when instruments were used.

Endodontics and the irradiated patient.

With increasingly larger numbers of irradiated patients in our population, it seems likely that all denists will eventually be called upon to manage the difficult problems that these patients present. Of otmost concern should be the patient's home care program and the avoidance of osteroradionecrosis. Endodontics and periodontics are the primary areas for preventing or eliminating the infection that threatens osteoradionecrosis. Endodontic treatment must be accomplished with the utmost care and maximum regard for the fragility of the periapical tissues. Pulpally involved teeth should never be left open in an irradiated patient, and extreme care must be taken with the between-visits seal. If one is called upon for preradiation evaluation, routine removal of all molar as well as other compromised teeth should be considered. Attention should be directed to the literature for further advances in the management of irradiated patients.