One Month Follow up Study to Seek Patient’s Environmental Factors Affecting Silicone-Based Resilient Denture Liners Embedded in Maxillary Complete Dentures

Objective: This study aimed to seek patient’s environmental factors affecting silicone-based resilient denture liners. Methods: Thirty individuals with maxillary complete dentures were recruited for the study. One investigator measured the Shore D hardness of commercially available SRDLs Evatouch Super (EVA), Mucopren soft (MCP), and GC RELINE (GCR) embedded in maxillary complete dentures using a Vesmeter®. Participants’ environments smoking, drinking, denture wearing during sleeping, and denture cleanser usage were asked as environmental factors potentially affecting on Silicone Based Resilient Denture Liners (SRDLs). A two-way repeated measure Analysis of Variance (ANOVA), with the material type (EVA, MCP, and GCR) and time (baseline and 1 month after application) as factors, was used to assess changes in the hardness of the three SRDLs over time. The effects of categorical variables, such as sex, smoking, drinking, denture wearing during sleeping, and denture cleanser usage, on the hardness of the ARDLs were analyzed using a two-way ANOVA without a post hoc test; we were not interested in comparing each ARDL but rather in analyzing the effects of categorical variables on the ARDLs. A p-value of <0.05 was considered statistically significant. Results: The changes in hardness for the GCR were less than the changes for EVA and MCP. The type of denture material and participants with complete maxillary complete dentures had harder SRDLs than did those with complete maxillary and mandibular complete dentures. The resting salivary flow rate, pH of the resting and stimulated saliva, and occlusal force showed associations with the hardness of EVA, MCP, and MCP respectively. Conclusions: The results suggest that the hardness of SRDLs changes over time and patients’ environments could not influence on the hardness changes of SRDLs.