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Background and objectives: There has been a lack of studies regarding the marginal seal and structuraldurability of a novel temporary crown system (Hi-tempo) manufactured from a polylactic (PLA) based resinthermoplastic material especially in terms of cyclic loading. Therefore, the purpose of this pilot study wasto investigate the efficiency of this novel temporary crown system’s (Hi-tempo) marginal seal and structuraldurability in terms of cyclic loading.Methods: A crown preparation was duplicated in bovine teeth (n =15) using a copy mill machine. Thespecimens were divided into three groups and temporary crowns were fabricated that consisted of: controlgroup, Luxatemp (bis-acrylic), Hi-tempo crown, PLA based and Hi-tempo window type crown, PLA basedwith resin cusps. Marginal dimensional change was measured before and after cyclic loading with a 93.36N force, 0.63 HZ, for 45360 cycles (stimulating 21 days in vivo) in water pigmented with a red dye. Themarginal change was statistically analysed and the surface roughness was analysed using scanning electronmicroscopy (SEM).Results: Statistical significance (p&lt;0.05) was found in the marginal changes of the control versus the Hitempo window and the Hi-tempo groups. SEM analysis revealed that the control crowns, had a muchrougher surface with micro-cracks compared to PLA based crowns which had homogenous surfaces. Allthe specimens showed leakage of the red dye into the internal fitting surfaces of the crowns.Conclusions: The novel system showed promising and comparable results in terms of structural durabilityand marginal seal compared to the conventional system.

The Efficacy of a Novel Temporary Crown System Marginal Seal and Structural Durability in Terms of Cyclic Loading - A Pilot Study