Aim: Soft liners are temporary in nature as they harden in short time period and gradually lose their surface integrity and cushioning effect. There is a need to increase the longevity of the soft liner, so the present investigation was done in order to study the effect of surface treatment in increasing the longevity of soft liner, both in in vitro and in vivo conditions.
Materials and methods: For an in vitro study, specimens were prepared and divided into two equal groups. Group I (control group) specimens were lined with soft liner and left uncoated and group II (treated group) specimens were lined with soft liner and were coated by surface conditioning agent. For an in vivo study, 20 patients were selected and divided into two groups. Group I (control group) patients wore denture lined with uncoated soft liner, whereas group II (treated group) patients wore denture lined with soft liner and coated with surface conditioning agent. Soft liners lining the specimens and dentures were then examined for softness with a durometer and for surface integrity with a scanning electron microscope (SEM) at the baseline and after 1, 2, and 3 weeks.
Results: Mean softness of the control group decreased significantly than the treated group, both in in vitro and in vivo conditions at the end of third week, but the decrease in softness was found to be more in in vivo condition than in vitro condition. Both in in vivo and in vitro conditions, SEM analysis showed that surface integrity in the control group had deteriorated by the end of first week, whereas that in the treated group remained intact until the end of the third week in in vitro condition and until the end of second week in in vivo condition.
Conclusion: Our results suggest that surface coating can significantly reduce the loss of softness and surface integrity of the soft liners, and hence increases their longevity both in in vitro and in vivo conditions.
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