Composite dowels and cores: effect of moisture on the fit of cast restorations.

A study was undertaken to evaluate the effect of interim restorations on the dimensional stability of composite post and core buildups subjected to moisture during the fabrication of cast restorations. Dimensional change associated with composite dowel and core buildups did not significantly alter the fit of cast restorations compared with natural teeth under the same conditions. The use of composite dowels and cores for the restoration of endodontically treated teeth is not contraindicated because of potential dimensional instability of the resin when exposed to moisture.

Effect on the fit of removable partial denture frameworks when master casts are treated with cyanoacrylate resin.

Master casts of improved dental stone were made from irreversible hydrocolloid impressions of a metal model. Half of the master casts were treated with cyanoacrylate resin and half were untreated controls. They were sent to a dental laboratory for framework fabrication.

Changes in pH of irreversible hydrocolloid impression materials during setting.

Two ophthalmic and four dental irreversible hydrocolloid materials were tested in vitro to determine the initial pH and changes in pH to completion of set over 4 minutes. The ophthalmic Moldite material became more basic during its setting whereas the ophthalmic Moldeye material remained stable throughout the setting. The other materials tested decreased in pH with time.

Interim obturation of palatal perforations to facilitate routine dental care.

Routine preventive or restorative dental procedures (or both) may be compromised, deferred, or even denied to patients with exceptional problems that complicate treatment. Perforations of the hard palate require temporary obturation while the patient receives routine dental care such as prophylaxis, periodontic treatment, restorative dentistry, and repair or modification of an existing prosthesis. Temporary obturation, using an adhesive peristomal covering has been a helpful adjunct to prevent the dehydrating of a patient's nasal tissues, to facilitate the patient's speech and deglutition, and to maintain the patient's psychological well-being while the prosthesis is out of the mouth.