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A Comparative Evaluation of Dimensional Stability of Implant Impressions with Delayed vs Immediate Pouring Using
Kishan Choithani1, Akhilesh Patoliya2, Chirag R Vaniya3
1Department of Dentistry, GMERS, Sola, Ahmedabad, Gujarat, India.
Background:
Dimensional stability of impression materials is crucial in implant prosthodontics. Delay in cast pouring can introduce errors that affect prosthesis fit.
Aim:
To evaluate and compare the dimensional stability of casts obtained from polyether and polyvinyl siloxane impression materials when poured immediately, after 24 hours, and after 48 hours.
Materials And Methods:
Forty-eight impressions were made on a reference mandibular edentulous model with four implants using the direct pick-up technique. Impressions were divided into two groups (polyether, polyvinyl siloxane) and three subgroups each (immediate pour, 24 hours, 48 hours). Casts were measured for linear and angular distortions using a coordinate measuring machine.
Results:
Mean inter-implant distances and angular deviations were statistically analyzed using ANOVA. Polyether showed superior dimensional stability at all time points compared to polyvinyl siloxane. Delayed pouring introduced significant distortion in both materials.
Conclusion:
Immediate pouring is recommended for optimal accuracy. Polyether demonstrated better stability than polyvinyl siloxane with delayed pouring.
