Abstract
Objective: To investigate the biological effect of a new method to camouflage the cobalt-chromium (CoCr) metal structure of an RPD, onto which an electrostatic paint was applied. Methods: In vitro cytotoxicity of epoxy Politherm NOBAC30C (Weg Industries SA, Santa Catarina, Brazil) in combination with polished CoCr was tested by placing it in contact with cultured human fibroblasts and comparing it with polystyrene (control surface). The cells were cultured in the presence of the test surfaces for 24, 48, 72, 94 and 120 hours. The number of viable and non-viable cells was established by manual counting. The Tukey test was used to statistically analyze cell counts between the groups. Results: The results showed that cell proliferation was similar between the groups (p =0.2174). It was observed that at 24, 48 and 72 h, there was no significant increase in cell proliferation in all groups. From 96 to 120 h, an increase in cell proliferation was observed in all groups, with no significant difference between them (p>0.05). Conclusion: The epoxy paint studied showed no cytotoxicity in vitro.
Highlights
Advances in dental materials come from combining the functional and aesthetic needs of patients when providing them with prosthetic apliances
An attempt to eliminate the metal structure reappeared with the advent of flexible resins
Two groups (n=30) were formed according to the alloy surface treatment: Group 1- Airbone particle abrasion + paint (Epoxy Politherm 30 Nobac C Paint WegIndústrias S.A - Química, Guaramirim - Santa Catarina, Brazil) (Figure 2); Group 2- polishing as recommended for Removable Partial Dentures (RPD) metal structures[13] (Figure 3)
Summary
Advances in dental materials come from combining the functional and aesthetic needs of patients when providing them with prosthetic apliances. Studies relating to mechanical and functional aspects of Removable Partial Dentures (RPD) have led to the belief that clasp-retained metal structures are the most stable RPD type and cause fewest injuries to the remaining abutment teeth[1,2]. Despite a lack of longitudinal studies, such appliances are regarded as esthetically satisfactory, but leave something to be desired with regards to durability and protection of the abutment teeth[3,4]. Other ways to achieve aesthetics in RPDs include overdentures, Dolder bars and intracoronal attachments. These usually involve purposely wearing the tooth and additional costs, due to the increased complexity of such an approach[5]
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