In which оf the fоllоwing cаses would it be аppropriаte to use an ultrasonic scaler in the overall treatment plan? 1) a patient with healthy periodontal tissues who has moderate stain2) a patient with gingivitis who has light proximal and marginal plaque3) a patient with periodontitis who has moderate subgingival proximal calculus4) a patient with periodontitis who has isolated periodontal pockets