Glass transition temperature of hard chairside reline materials after post-polymerisation treatments.
OBJECTIVE
This study evaluated the effect of post-polymerisation treatments on the glass transition temperature (T(g)) of five hard chairside reline materials (Duraliner II-D, Kooliner-K, New Truliner-N, Ufi Gel hard-U and Tokuso Rebase Fast-T).


METHODS
Specimens (10 x 10 x 1 mm) were made following the manufacturers' instructions and divided into three groups (n = 5). Control group specimens were left untreated. Specimens from the microwave group were irradiated with pre-determined power/time combinations, and specimens from the water-bath group were immersed in hot water at 55 degrees C for 10 min. Glass transition ( degrees C) was performed by differential scanning calorimetry. Data were analysed using anova, followed by post hoc Tukey's test (alpha = 0.05).


RESULTS
Both post-polymerisation treatments promoted a significant (p < 0.05) increase in the T(g) of reline material K. Materials K, D and N showed the lowest T(g) (p < 0.05). No significant difference between T and U specimens was observed.


CONCLUSIONS
Post-polymerisation treatments improved the glass transition of material Kooliner, with the effect being more pronounced for microwave irradiation.
Urban
Vanessa M
VM
Department of Dentistry, Ponta Grossa State University (UEPG), Ponta Grossa, PR, Brazil.
Machado
Ana L
AL
Alves
Marinês O
MO
Maciel
Adeilton P
AP
Vergani
Carlos E
CE
Leite
Edson R
ER
D000180:Acrylic Resins / Q000737:chemistry / Q000528:radiation effects; D002152:Calorimetry, Differential Scanning; D003764:Dental Materials / Q000737:chemistry* / Q000528:radiation effects; D003822:Denture Liners; D003823:Denture Rebasing; D005898:Glass / Q000737:chemistry* / Q000528:radiation effects; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry / Q000528:radiation effects; D008872:Microwaves; D058105:Polymerization; D012826:Silicone Elastomers / Q000737:chemistry / Q000528:radiation effects; D013997:Time Factors; D044366:Transition Temperature; D014867:Water / Q000737:chemistry
D000180:Acrylic Resins; D003764:Dental Materials; D008689:Methacrylates; D012826:Silicone Elastomers; C503430:Tokuso Rebase Fast; C483158:Ufi gel; C103362:duraliner II; D014867:Water; C103363:kooliner; C071514:truliner