[EP-11] Effect of additives on the physical properties of PEEK.
[Abstract]
[Objective]
Polyetheretherketone (PEEK) is a material with excellent biosafety and low risk of fracture. PEEK has been investigated in dentistry for use in various devices such as Implant abutments, denture bases. However, PEEK in dentistry is not the high-purity PEEK in industry, but colourants and fillers are added from an aesthetic point of view. In this study, the mechanical properties of industrial PEEK and dental PEEK were compared in order to clarify the influence of additives on the properties of PEEK.
[Method]
Three industrial PEEKs and one dental PEEK were used in this study. The industrial PEEKs used were high-purity PEEK (PEEK450G, Victrex, Lancashire, UK, NP), PEEK with 30% glass fibres (PEEK450GL30, Victrex, GP) and PEEK with 30% carbon fibres (Sumiploy CK4600, Victrex, CP). The dental PEEK used was Shofu PEEK Disc (Shofu, Kyoto, Japan SP). The three-point bending test was carried out in accordance with ISO standards (ISO-4049). The number of repetitions was set to 10, the flexural strength and modulus of elasticity were calculated from the measured values, a one-way analysis of variance was performed for each value, and Tukey's multiple comparisons were performed for those that showed a significant difference.
[Results and Discussion]
In the flexural strength, SP showed the highest value (203 Mpa) and CP the lowest value (165 Mpa), but there were no significant differences between the PEEKs other than CP. In the flexural modulus, GP showed the highest value (7.7 Gpa) and NP the lowest value (3.9 Gpa). The flexural behaviour of the materials showed that the maximum load values of NP and SP were measured without fracture, while fracture was observed at the load zone for GP and CP. These results suggest that the additives in SP can reproduce excellent colour reproducibility without compromising the high fracture resistance of high purity PEEK.
[Objective]
Polyetheretherketone (PEEK) is a material with excellent biosafety and low risk of fracture. PEEK has been investigated in dentistry for use in various devices such as Implant abutments, denture bases. However, PEEK in dentistry is not the high-purity PEEK in industry, but colourants and fillers are added from an aesthetic point of view. In this study, the mechanical properties of industrial PEEK and dental PEEK were compared in order to clarify the influence of additives on the properties of PEEK.
[Method]
Three industrial PEEKs and one dental PEEK were used in this study. The industrial PEEKs used were high-purity PEEK (PEEK450G, Victrex, Lancashire, UK, NP), PEEK with 30% glass fibres (PEEK450GL30, Victrex, GP) and PEEK with 30% carbon fibres (Sumiploy CK4600, Victrex, CP). The dental PEEK used was Shofu PEEK Disc (Shofu, Kyoto, Japan SP). The three-point bending test was carried out in accordance with ISO standards (ISO-4049). The number of repetitions was set to 10, the flexural strength and modulus of elasticity were calculated from the measured values, a one-way analysis of variance was performed for each value, and Tukey's multiple comparisons were performed for those that showed a significant difference.
[Results and Discussion]
In the flexural strength, SP showed the highest value (203 Mpa) and CP the lowest value (165 Mpa), but there were no significant differences between the PEEKs other than CP. In the flexural modulus, GP showed the highest value (7.7 Gpa) and NP the lowest value (3.9 Gpa). The flexural behaviour of the materials showed that the maximum load values of NP and SP were measured without fracture, while fracture was observed at the load zone for GP and CP. These results suggest that the additives in SP can reproduce excellent colour reproducibility without compromising the high fracture resistance of high purity PEEK.