Pressure distribution of mandibular complete denture using soft lining materials

Yoshikazu Yoneyama, DMD, PhD, Toshiaki Tojyo, DMD, PhD, Chikahiro Ohkubo, DMD, PhD, and Toshio Hosoi, DDS, PhD

Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, Yokohama, Japan

Purpose: This study evaluated the effectiveness of pressure distribution under dentures using two types of soft lining materials to improve denture stability and comfort.
Materials and Methods: Two experimental dentures were duplicated from an existing complete mandibular denture. Denture base resin was shaved from the basal surface of each denture to allow for 1- and 2-mm thick acrylic (COE-Soft) or silicone (Soft Relining) lining materials to be affixed. Four microminiaturized pressure sensors were fixed to the intaglio surface of the denture bases to monitor bite pressure at four locations, namely, the bilateral first molars and first premolars. Each degree of bite pressure was measured five times under 49, 98, 147, and 196 N loads for 5 s. All data were statistically analyzed using ANOVA/Tukey’s test at α=0.05.
Results: As the loads increased, the total pressure at the four locations proportionally increased for both thicknesses. The 2 mm-thick silicone lining showed a significantly lower pressure burden than the 1 mm-thick silicone lining (p<0.05). However, there was no difference in the pressure burden between the 1- and 2-mm acrylic lining materials (p<0.05).
Conclusion: Acrylic lining materials should be used for difficult cases of mandibular edentulous patients when sufficient lining space is not available.(Int Chin J Dent 2010; 10: 17-21.)

Key Words: complete denture, pressure distribution, soft lining material