Abstract
The aim of the current study was to examine the shear punch strength (SPS) of high-strength glass ionomer cements (HSGICs) in relation to coating applications and duration of coating. I-Ninety specimens each of Fuji IX GP Fast (FIX Fast), Ionofil Molar AC (IM), Riva Self Cure (R) and Ketac Molar (KM) were prepared and divided into uncoated and coated groups, sub-divided into three sub-groups and incubated for 24h, 1week or 8weeks (distilled water, 37°C) before SPS. II-Ninety specimens each of uncoated and coated Fuji IX GP Extra were similarly prepared, divided into six sub-groups and incubated for 2h, 24h, 1week, 1month, 2months or 3months (artificial saliva, 37°C) before SPS. Another 90 specimens were coated for 2h, 24h, 1week, 1month or 2months, after which the coating was removed. Specimens were re-incubated in artificial saliva until the end of the 3-month period and then subjected to SPS. None of the materials gained extra strength when coated. Uncoated KM, IM (at all times) and FIX Fast (at 24h) were stronger. Fuji IX GP Extra achieved 11.5MPa after 2h, which increased to 56.7MPa after 24h. The highest strength after 3months was achieved when the coating was retained for 2h (71.7MPa). A resin coating will not positively affect the SPS of HSGICs. There is no need to protect HSGICs from water to gain extra strength unless the coating is retained for 2h.
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