IADR Abstract Archives
Evaluations of Sandblasting and Plasma Treatments on CIM Zirconia Implants
Objectives: Zirconia is accepted as the next-generation implant materials due to its good biocompatibility and tooth-color. The study aimed to compare the effects of sandblasting and atmospheric-pressure oxygen plasma (AOP) treatments on the ceramic-injection-molding (CIM) zirconia, on changing their surface morphology, hydrophilicity, and surface roughness, and the attachment and proliferation behaviors of osteoblast.
Methods: Zirconia discs were prepared by using CIM and from the same mold of the zirconia implant. The discs were debindered and then sintered up to 1500°C. The test pieces were divided into four groups and subject to the combinations of sandblasting and/or AOP treatments. The surface roughness and hydrophilicity of the treated specimens were measured by a profilometer and a contact angle test. The surface morphology was observed by field-emission electron microscopy (FE-SEM). MG63 cells were seeded on these discs to examine the cell attachment and proliferation after 1 and 24 hours.
Results: The CIM zirconia show intact surfaces without obvious pores. The polygonal grains were 440-500 nm in size, and was not changed by AOP. The surface roughness of untreated zirconia was 1.7 μm. The sandblasting reduced the surface roughness (1.0 μm), while AOP slightly increased the roughness (1.9μm). The original contact angle by water was 53.9°, which increased to 70.0° after sandblasting. AOP greatly reduced the water contact angle to 10.1° (without sandblasting) and 6.6° (with sandblasting). After 1 hour, cells adhered firmly to zirconia, and the cell numbers increased in all groups (121-212%). After 24 hours, cells continuously proliferated. Cell growth was accelerated by sandblasting (658 vs. 528%), but was suppressed after AOP (378-420%).
Conclusions: AOP significantly enhanced the hydrophilicity of CIM-zirconia without changing the roughness. Contrarily, sandblasting reduced the roughness and wettability. For the cell growth, sandblasting is expected to promote the cell attachment and growth.
Methods: Zirconia discs were prepared by using CIM and from the same mold of the zirconia implant. The discs were debindered and then sintered up to 1500°C. The test pieces were divided into four groups and subject to the combinations of sandblasting and/or AOP treatments. The surface roughness and hydrophilicity of the treated specimens were measured by a profilometer and a contact angle test. The surface morphology was observed by field-emission electron microscopy (FE-SEM). MG63 cells were seeded on these discs to examine the cell attachment and proliferation after 1 and 24 hours.
Results: The CIM zirconia show intact surfaces without obvious pores. The polygonal grains were 440-500 nm in size, and was not changed by AOP. The surface roughness of untreated zirconia was 1.7 μm. The sandblasting reduced the surface roughness (1.0 μm), while AOP slightly increased the roughness (1.9μm). The original contact angle by water was 53.9°, which increased to 70.0° after sandblasting. AOP greatly reduced the water contact angle to 10.1° (without sandblasting) and 6.6° (with sandblasting). After 1 hour, cells adhered firmly to zirconia, and the cell numbers increased in all groups (121-212%). After 24 hours, cells continuously proliferated. Cell growth was accelerated by sandblasting (658 vs. 528%), but was suppressed after AOP (378-420%).
Conclusions: AOP significantly enhanced the hydrophilicity of CIM-zirconia without changing the roughness. Contrarily, sandblasting reduced the roughness and wettability. For the cell growth, sandblasting is expected to promote the cell attachment and growth.