Aim: To evaluate and compare the linear dimensional stability of two commercially available BD IMPRESS and NEXUS MEDODENT
thermoplastic impression materials. A total of 90 samples in which 45 s Methodology: amples of BD Impress and Nexus medodent impession
materials were used for evaluation of linear dimensional stability of these newly introduced thermoplastic impression materials. The samples were
rst checked under toolmaker microscope for reproduction of three parallel lines x,y,z. The measurements were made on the samples at 0 (within 24
hours), 7th and 14th day respectively to assess the linear dimensional stability. According to the study conducted and results obtained, it Result:
was concluded that NEXUS MEDODENT was superior in linear dimensional stability on comparison with BD IMPRESS impression material
Conclusion: On comparison with BD impress, nexus medodent impression material was superior in terms of linear dimensional stability. There is
a need for further studies to know about other properties of these thermoplastic impression materials to enhance knowledge and for clinical
application as indicated by manufacturers.
Impression making is the primary step in the process of fabrication of prosthetic restoration. Dimensional stability, Surface detail reproduction, and
compatibility with gypsum products is an essential prerequisite for a successful restoration. Clinically, the accuracy of impressions depends on two
major aspects: 1) Ability to ow and adapt intimately to the relevant surfaces while making the impression, and 2) the wetting of the polymerized
impression material by the gypsum. The purpose of this study is to evaluate and compare the surface detail reproduction of BD Impress and Nexus
Medodent impression material. The results showed signicant difference in surface detail between the two thermoplastic impression materials
with p-value <0.05. It was observed that comparison of mean scores obtained by BD Impress and Nexus Medodent impression material are 2.7556
and 2.2222 respectively. The materials with minimum mean score value is considered as the material with good surface detail reproduction. Thus
one can conclude that Nexus Medodent thermoplastic material has the good surface detail reproduction compared to BD Impress thermoplastic
material.
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