TY - JOUR ID - TI - Surface Porosity of Different Investment Materials with Different Mixing Techniques AU - Ibtehal H Al–Zubaidy AU - Luma M Al–Nema AU - Ahmed A Al–Ali PY - 2009 VL - 9 IS - 2 SP - 307 EP - 314 JO - Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان SN - 18121217 19980345 AB - Aims: To evaluate and compare the number and surface area of surface porosities of different dental investment
materials by using two mixing techniques. Materials and Methods: Two mixing techniques;
manual and mechanical were used to prepare specimens for four dental investment materials: Biosint Supra,
Rema Exakt, Rematitan Plus, and Deguvest soft. Computer programs are used to measure the number
and surface area of the porosities to compare among them. ANOVA, Duncan multiple range test in addition
to T–test were carried out to determine the significant difference at P<0.05. Results: In relation to the surface
area of the porosities, there are high significant differences among the investment materials tested, and
high significant difference is presented between the two mixing techniques tested with the manual mixing
technique and showing higher value than the mechanical vacuum mixing technique. In relation to the number
of porosities, there are no significant difference among the investment materials tested, but there are
very high significant differences between the two mixing techniques tested with the manual mixing technique
and showing higher value than the mechanical vacuum mixing technique. Conclusions: the number
and surface area of the surface porosities differ from the different materials used, and differ in the same
material by changing the mixing technique.

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