Re: The effect of occlusal discrepancies on periodontitis. I. Relationship of initial occlusal discrepancies to initial clinical parameters. Nunn NE, Harrel SK (2001;72:485-494). The effect of occlusal discrepancies on periodontitis. II. Relationship of occlusal treatment to the progression of periodontal disease. Harrel SK, Nunn ME (2001; 72:495-505).