Abstract:Objective To explore the efficacy of fixed dental prostheses in repairing dentition defects and its impact on masticatory function and the levels of TNF-α and IL-1β in gingival crevicular fluid.Methods The study included 86 patients with dentition defects treated at Yulin First Hospital from March 2021 to March 2023. Using a coin-flipping method, participants were divided into a control group (43 patients) treated with removable dentures and an observation group (43 patients) treated with fixed dental prostheses. The two groups were compared before and three months after treatment in terms of periodontal indices [Gingival Index (GI), Plaque Index (PI), Sulcus Bleeding Index (SBI) ], occlusal function, masticatory function, oral health status [Oral Health Impact Profile-14 (OHIP-14) ], and inflammatory markers in gingival crevicular fluid [tumor necrosis factor-α (TNF-α), interleukin-1 β (IL-1β), serum amyloid A (SAA) ].Results The observation group showed greater improvements in GI, PI, and SBI after treatment compared with the control group (P < 0.05). The excellent occlusal function rate was 93.02% in the observation group compared with 74.42% in the control group, indicating a better outcome in the observation group (P < 0.05). The differences of masticatory efficiency and OHIP-14 scores before and after treatment were greater in the observation group than in the control group (P < 0.05). The differences of levels of TNF-α, IL-1β, and SAA before and after treatment were also greater in the observation group compared with the control group (P < 0.05).Conclusions Fixed dental prosthesis effectively improves the periodontal health status, and occlusal and masticatory functions of patients with dentition defects, and reduces the levels of TNF-α, IL-1β, and SAA in the gingival crevicular fluid, thereby enhancing oral health and overall quality of life.