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periodontics nspt nonsurgical periodontal therapy pdl perio periodontology periodontal ligament nup nug necrotizing periodontal diseases anug necrotising periodontal diseases gingival diseases periodontal abscess acute gingival infection acute periodontal infections gingival abscess food dental assistant dental hygienist dental nutrition diet periodontal complications complications of periodontal surgery periodontal osseointegration implant dentistry implant implants dental implants phase 2 periodontal therapy phase ii surgical periodontal therapy phase ii periodontal therapy