| 摘要 | 第4-5页 |
| Abstract | 第5-6页 |
| Chapter one | 第9-11页 |
| Chapter two | 第11-18页 |
| 2.1 Material agents. | 第11页 |
| 2.2 Study population. | 第11-12页 |
| 2.3 Inclusion criteria | 第12页 |
| 2.4 Exclusion criteria | 第12-13页 |
| 2.5 Clinical measurements. | 第13-15页 |
| 2.6 Radiographic examination. | 第15页 |
| 2.7 Treatment modality. | 第15页 |
| 2.8 GCF Sample collection. | 第15-16页 |
| 2.9 Enzyme-linked immunosorbent assay (ELISA) detection of DKKl. | 第16-17页 |
| 2.10 Statistical analysis | 第17-18页 |
| Chapter three | 第18-25页 |
| 1 Distribution of the study population according to gender | 第18页 |
| 2 Distribution of the study population according to oral hygiene. | 第18-19页 |
| 3 Distribution of the study population according to age. | 第19-20页 |
| 4 Expressional level of Dkkl in relation to periodontal indices. | 第20页 |
| 5 Distribution of the study population according to the severity of chronicperiodontitis in three visits. | 第20-21页 |
| 6 Mean of Dkkl level in study population in the ifrst visit ( X 土S)_ one sample ttest. | 第21-22页 |
| 7 Expressional level of DKKl in moderate to severe group in comparison tomild and healthy control group in the first visit. | 第22-23页 |
| 8 Expressional level of DKKl among moderate to severe chronic periodontitisgroup in the second and third visits. | 第23-25页 |
| Chapter four | 第25-29页 |
| Chapter ifve | 第29-30页 |
| References | 第30-34页 |
| Literature review | 第34-55页 |
| References | 第47-55页 |
| Acknowledgement | 第55-56页 |
| Personal Identity | 第56页 |
