the major difference between periodontal screening and recording (psr) and a comprehensive periodontal charting is that: group of answer choices a) psr uses a regular probe, and the periodontal charting requires a who probe b) psr records one code for each sextant, and comprehensive periodontal charting records six readings for each tooth c) psr does not take bleeding points into consideration, and a comprehensive periodontal charting does d) psr does not take recession into consideration, and a comprehensive periodontal charting does