Shrinkage stresses associated with incremental composite filling techniques in conservative Class II restorations.

Conservative Class II preparations are widely utilized, however the stresses produced by incremental composite placement/curing has not been demonstrated. The purpose of this investigation was to visualize the stresses generated by composite resin placed into photoelastic models of conservative Class II preparations using different incremental techniques. Conservative Class II preparations on three different primary molar replicas were cast life-sized in a photoelastic material.

Shrinkage stresses associated with incremental composite filling techniques.

It is commonly accepted that stresses associated with polymerization shrinkage of composite restoratives can be reduced by utilization of an incremental filling procedure. A recent report using finite element analysis on a simple box preparation has shown that such a procedure actually produces higher stresses. The purpose of this investigation was to visualize the stresses generated by composite resin placed into photoelastic models of two surface preparations using different incremental techniques.

[Antineoplastic effectiveness and unwanted side effects of polychemotherapy of extensive oro- and hypopharyngeal cancers--results of a prospective therapy study with 5-FU/cisplatin versus 5-FU/carboplatin].

60 patients with advanced carcinomas of the oropharynx and hypopharynx underwent chemotherapy, either with 5-FU/Cisplatin (n = 30) or with 5-FU/Carboplatin (n = 30). The remission-rates (complete and partial remissions) were comparable in both groups. The rate of complete remissions, however, was statistically significant higher in the cisplatinum group (6 patients) than in the carboplatinum group (1 patient).