Information on the long-term clinical performance of composite resins in posterior restorations is still very limited. The council has classified some composite resins as "provisionally acceptable" for permanent teeth on the basis of information submitted under the guidelines for the acceptance program for composite resins for occlusal Class I and Class II restorations. This classification, however, does not imply their unlimited use as routine restorative material in stress-bearing areas in all situations. No justification exists to extrapolate the performance data to situations in which there are limited documented results. Also no justification exists to extrapolate the performance of one composite resin to other composite resins. The guidelines of the acceptance program were established on the basis of information available in 1981. Information is emerging that suggests that these limits do not necessarily provide a critical evaluation of the long-term performance of composite resins in posterior restorations. The guidelines are being reviewed and revised. The profession is advised to be cautious in the manipulation and application of composite resins as they are sensitive to technique. A composite resin should not be handled like an amalgam. Slight deviations from the proper technique may result in postoperative sensitivity, secondary caries, and clinical performances different from those reported in clinical studies. The cavity preparation should be conservative, and the restoration should be subjected to minimal occlusal stresses. The use of a rubber dam is essential. The profession should be aware that composite resins do have occlusal wear. Proximal contacts are difficult to establish.(ABSTRACT TRUNCATED AT 250 WORDS)

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