J Adv Prosthodont.  2020 Dec;12(6):369-375. 10.4047/jap.2020.12.6.369.

In vitro evaluation of a removable partial denture framework using multi-directionally forged titanium

• Suzuki G
• Shimizu S
• Torii M
• Tokue A
• Ying G
• Yoshinari M
• Hoshi N
• Kimoto K
• Miura H
• Hayakawa T
• Ohkubo C

• KMID: 2509777
• DOI: http://doi.org/10.4047/jap.2020.12.6.369

Abstract

PURPOSE
This study evaluated the availability of multi-directionally forged (MDF) titanium (Ti) as a component of removable partial dentures (RPDs). MDF-Ti remarkably improved the mechanical properties of RPDs due to its ultrafine-grained structure.
MATERIALS AND METHODS
The wear resistance, plaque adhesion, and machinability of MDF-Ti were tested. As controls, commercially pure (CP) titanium was used for wear, plaque adhesion, and machinability tests. For wear resistance, the volume losses of the titanium teeth before and after wear tests were evaluated. Plaque adhesion was evaluated by the assay of Streptococcus mutans. In the machinability test, samples were cut and ground by a steel fissure bur and carborundum (SiC) point. An unpaired t-test was employed for the analysis of the significant differences between MDF-Ti and the control in the results for each test.
RESULTS
Wear resistance and plaque adherence of MDF-Ti similar to those of CP-Ti (P>.05) were indicated. MDF-Ti exhibited significantly larger volume loss than CP-Ti in all conditions except 100/30,000 g/ rpm in machinability tests (P<.05).
CONCLUSION
Although the wear resistance and plaque adherence of MDFTi were comparable to those of controls, MDF-Ti showed better machinability than did CP-Ti. MDF-Ti could be used as a framework material for RPDs.

Keyword

Multi-directionally forged titanium (MDF-Ti); Wear resistance; Machinability; Removable partial dentures (RPDs)