evaluation of marginal fit of three different interim restoration materials an invitro study

Introduction: the aim of this experimental invitro study was to evaluate and compare marginal accuracy of interim restorations made with three chemically different  interim materials one hour after fabrication and at one week interval. methods: twenty samples from each group with a total of sixty were fabricated on a customized metal die. the three test groups were as below; group a protemp tm 4 (3m espe ag dental products, germany), a bisacrylic based selfcure temporary material; group b revotek lctm (gc dental products corp., japan), a urethane dimethacrylate based light cure temporary material and group c tufftemp™ plus (pulpdent corporation, u.s.a), a rubberizedurethane based dual cure temporary material. all samples were stored in artificial saliva and evaluated for marginal discrepancy using a stereomicroscope, one hour and one week after fabrication. statistical analysis was done using one way anova test and tukeys posthoc tests. results: statistical significant difference existed between three groups after one hour (p <0.001) and after one week (p <0.001), tufftemp™ plus showed the least marginal discrepancy (at one hour =192.3± 0.75µm; at one week = 242.69 ± 5.64µm), while revotek lctm (at one hour = 232.52± 0.48µm; at one week = 293.68 ± 3.75µm) had the highest discrepancy. conclusions: tufftemp™ plus showed higher marginal accuracy followed protemp tm 4 and revotek lctm at one hour and one week interval.