Alveolar Bone Loss 1 Biomarker 1 Biomarkers 1 Humans 1 Interleukin-1beta 1 MMP8 protein, human Matrix Metalloproteinase 8 1 Periodontal Diseases 1 Porphyromonas gingivalis 1 ROC Curve 1 Saliva 1 alveolar bone loss 1 biological marker 1 human 1 interleukin 1beta 1 interleukin-1β 1 matrix metalloproteinase-8 1 metabolism 1 microbiology 1 neutrophil collagenase 1 periodontal disease 1 periodontitis 1 porphyromonas gingivalis 1 receiver operating characteristic 1 saliva 1