Objectives: Temporary resilient lining materials (tissue conditioners) containing methacrylate polymer and plasticizer are widely used for improvement of the health of a soft tissue in the denture-bearing areas. However, softness of this material is well-known to be lost within the few days due to the elution of the low-molecular-weight plasticizer into the mouth. A new temporary lining material (TissueCare, TC) containing liquid high-molecular polyacrylate as a non-bleeding plasticizer was developed. The purpose was to evaluate the softness and its durability of TC compared with that of commercial temporary lining materials.
Methods: Shore A hardness of TC as well as the commercial temporary resilient lining materials (Lynal, LY; COE-COMFORT, CC; Softone, ST; Visco-gel, VG) was measured. Specimens (9-mm diameter x 12 mm) were immersed in water at 37 C for 4 weeks and measured for Shore A hardness (ISO 7619-1) once per week.
Results: Means (sd, n=3) of Shore A hardness are summarized below. There was only slight variation of hardness in TC compared with other tissue conditioners.
Products
| Hardness (Shore A) | ||
24 hours | 2 weeks | 4 weeks | |
TC | 11(0.6) | 13(0.6) | 13(0.6) |
LY | 22(0.6) | 28(1.0) | 34(0.6) |
CC | 6(0) | 30(0.6) | 38(0.6) |
ST | 7(0.6) | 29(0.6) | 31(1.0) |
VG | 8(0.6) | 22(1.2) | 28(0.6) |
The results showed TC maintained softness for a longer period than other commercial tissue conditioners. It can be assumed that polymeric plasticizer chain was entangled and caught in a methacrylic matrix, which caused reduced leaching.
Conclusions: TC maintained low Shore A hardness during storage in water over a period of 4 weeks compared with other tissue conditioners.