Aim: The purpose of this study was to evaluate the adaptation of
inlay restorations cast in commercially pure titanium (cp Ti) after
inclusion of the wax patterns in either a phosphate-bonded investment
(Rematitan Plus®) or a silicon oxide-based investment
(Termocast®). Methods: The wax patterns were prepared over an
inlay-type mold. After waxing, 5 measurements of the marginal
adaptation were made on the mesial and distal faces. Five wax patterns
were included in each type of investment under vacuum. The cast
specimens were repositioned in the mold and other 5 measurements of the
adaptation were made based on the same initial testing conditions. Data
were analyzed statistically by two-way ANOVA and Duncan’s
post-hoc (P<0.01) using the SPSS statistical software package
version 12.0 (SPSS, Chicago, IL, USA). Results: The mean marginal
discrepancies of the MOD inlays were higher in the Termocast®
Group. Termocast® presented significantly greater marginal
discrepancy than Rematitan Plus®. Due to the great permeability of
the investment refractory material, internal porosity was extremely
rare in Rematitan Plus® and more common in Termocast®.
Conclusion: It may be concluded that Termocast® investment should
not be indicated for cp Ti casting due to poor adaptation and porosity
on the casting surface