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Purpose: This study aimed to investigate the effects of microwave and conventional sintering methods on the marginal and internal fit of 3-unit full-contour zirconia bridges. Methods: The zirconia specimens were designed as 3-unit full-contour bridges, and a total of 20 units were fabricated. Ten specimens of each commercial zirconia brand were divided into two subgroups (n=10) and sintered at a maximum temperature of 1,530°C using two methods: conventional and microwave sintering. The marginal and internal fit of the preshaded zirconia prostheses was evaluated using the silicone replica technique, followed by the two-dimensional analysis. An independent sample t-test was then performed to compare and analyze the data between the two groups (α=0.05). Results: The results showed no significant difference in the fit of zirconia bridges between the groups (p>0.05). All specimens remained within the clinically acceptable limit of 120 μm, indicating that the microwave speed sintering protocol is suitable for clinical application. Conclusion: This study demonstrates the potential of the microwave sintering method as a viable alternative to conventional furnace sintering. It not only significantly reduces the processing time but also helps achieve a precise fit that ensures long-term clinical outcomes.