ICP & EPA JOINT MEETING, Amsterdam, Netherlands, 4 - 07 September 2019, pp.145
IN-VITRO COMPARISON OF MECHANICAL AND PHYSICAL
PROPERTIES OF VARIOUS PROVISIONAL RESTORATION MATERIALS
Burduroglu, Defne *, Keyf, Filiz
Bezmialem Vakif University, Faculty of Dentistry
Department of Prosthodontics
Keywords: provisional restoration, color stability, flexural strength
Purpose/Aim: It is important for patient comfort and satisfaction that provisional restorations should not fracture, get deformed and
show discoloration while in use. In our study, 6 different provisional restoration materials were subjected to micro hardness test and
flexural test in order to measure mechanical strength, surface roughness test and discoloration tests in order to evaluate esthetics. With
the help of these tests, we searched for materials that are advantageous during clinic use.
Materials and Methods: Vita CAD-Temp and Ivoclar Telio-CAD blocks for CAD/CAM are used in our study. Other materials used in
our study are Revotek LC (UDMA), Protemp 4 (Bis-acryl), Dentalon Plus (PEMA) and Imident (PMMA). Samples for 3-point bending
test are manufactured with dimensions 2 x 2 x 25 mm according to ISO 4049 (n=15). Samples were loaded with a universal testing
machine until fracture occurred. For micro hardness, surface roughness and discoloration tests, disc shaped samples with 10 mm
diameter and 2 mm thickness were manufactured (n=15). Baseline color measurements were made after Vickers micro hardness and
surface roughness tests. As a coloring agent, coffee was chosen. All samples were immersed in coffee solution for 7 days. Second color
measurements were made. ?E values, which shows discoloration, were calculated. Statistical analysis of the data was made with SPSS
for Windows 11.5. Kruskal Wallis test was used in order to evaluate level of significance (p<0,05).
Results: Flexural strength values varied between 146 MPa and 63 MPa. The strongest groups were Imident and Protemp 4. Micro
hardness and surface roughness evaluation showed methacrylate resins are better than other groups. As color stability, PMMA groups
were found to discolor less than other groups. Revotek LC and Protemp 4 showed clinically unacceptable ?E values (?E>3.3).
Conclusions: Based on this study data, it is advised to use heat polymerized PMMA when long-term use is indicated.