The modified Ottawa method to establish the update need of a systematic review: glass-ionomer versus resin sealants for caries prevention.

To demonstrate the application of the modified Ottawa method by establishing the update need of a systematic review with focus on the caries preventive effect of GIC versus resin pit and fissure sealants; to answer the question as to whether the existing conclusions of this systematic review are still current; to establish whether a new update of this systematic review was needed.