Premium
Effect of accelerated ageing and surface sealing on the permanent deformation of auto‐polymerising soft linings
Author(s) -
da Silva Joaquim,
Takahashi Jessica,
Nuňez Juliana,
Consani Rafael,
Mesquita Marcelo
Publication year - 2012
Publication title -
gerodontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.7
H-Index - 54
eISSN - 1741-2358
pISSN - 0734-0664
DOI - 10.1111/j.1741-2358.2010.00419.x
Subject(s) - silicone , ageing , deformation (meteorology) , medicine , composite material , acrylic resin , coating , materials science , dentistry
doi: 10.1111/j.1741‐2358.2010.00419.x
Effect of accelerated ageing and surface sealing on the permanent deformation of auto‐polymerising soft linings Purpose: To compare the effects of different ageing methods on the permanent deformation of two permanent soft liners. Materials and methods: The materials selected were auto‐polymerising acrylic resin and silicone‐based reliners. Sealer coating was also evaluated. Sixty specimens of each reliner were manufactured (12.7 mm diameter and 19 mm length). Specimens were randomly distributed into 12 groups ( n = 10) and submitted to one of the accelerated ageing processes. Permanent deformation tests were conducted with a mechanical device described within the American Dental Association specification number 18 with a compressive load of 750 gf applied for 30 s. All data were submitted for statistical analysis. Mann–Whitney test compared the effect of the surface sealer on each material and the permanent deformation of the materials in the same ageing group ( p = 0.05). Kruskal–Wallis and Dunn tests compared all ageing groups of each material ( p = 0.05). Results: The silicone‐based reliner presented a lower permanent deformation than the acrylic resin‐based reliner, regardless of the ageing procedure. The surface sealer coating was effective only for the thermocycled silicone group and the accelerated ageing processes affected only the permanent deformation of the acrylic resin‐based material. Conclusion: The silicone‐based reliner presented superior elastic properties and the thermocycling was more effective in ageing the materials.