Self-Adhesive Resin Cement
G-CEM is the first self-adhesive resin cement available in automix syringes for use with multiuse restorations.
GC America recently introduced their G-CEM self-adhesive resin cement in an Automix package to aid in delivery. G-CEM is intended for use with metal and porcelain-fused-to-metal crowns, bridges, inlays, and onlays; all-ceramic and composite crowns, bridges, inlays, and onlays; and prefabricated metal, fiberglass, and ceramic endodontic posts.
Twelve dentists participated in the evaluation of G-CEM Automix. They evaluated the product on such things as ease of extruding the material through the Automix syringe, uniformity of mix, and viscosity.
To use G-CEM Automix, apply the automix tip to the syringe, dispense the desired amount directly into the restoration, seat the restoration, and tack cure for 2 to 6 seconds. When the evaluators were asked to rate G-CEM Automix on ease of extruding the material through the syringe, 7 rated it as excellent, 4 rated it as very good, and 1 rated it as good. One evaluator described it as a “very smooth flow, but not too fast that there is waste or excess.”
Uniformity of Mix
GC America says that G-CEM Automix provides a consistent mixing ratio every time. The evaluators rated the product on its uniformity of mix. Six evaluators rated it as excellent, 5 rated it as very good, and 1 rated it as good. One evaluator said, “Very uniform, no bleeding between uses needed.” Another commented, “Good quality control.”
The 12 evaluators were asked to rate the viscosity of G-CEM Automix. Seven evaluators rated it as excellent, 3 rated it as very good, and 2 rated it as good. One evaluator said, “Good viscosity, it flows into the preparation and post space but isn’t runny or dripping off the tooth.”
The evaluators were asked to rate G-CEM Automix on retention of restorations. However, because of the shortterm nature of the evaluation, many of the evaluators were unable to answer that question. Because of the lack of response, retention was not included in the scoring of the product review. Of the evaluators who commented on retention, one said, “None have fallen out, but it’s too early to tell.” Another said, “Assuming it is good.”
Working and Setting Times
All of the evaluators said that working and setting times are important to them when choosing a self-adhesive resin cement. When they were then asked to rate the working time of G-CEM Automix, 7 rated it as excellent, 4 rated it as very good, and 1 rated it as good. With regard to setting time, 5 rated G-CEM Automix as excellent, 4 rated it as very good, and 3 rated it as good. One evaluator described the material’s working time as “adequate…no problem seating crowns due to setting.” With regard to setting time, this same evaluator said, “Good. No problems with crowns falling out.” Another evaluator found the setting time to be “too slow.”
Ease of Removing Excess
According to the manufacturer, excess G-CEM material can be removed with a scaler tip, after which it is given a final light cure. When the evaluators were asked to rate the ease of excess removal of G-CEM Automix, 7 rated it as excellent, 4 rated it as very good, and 1 rated it as fair. One evaluator said, “Great gel stage to remove excess, No problems removing from contact.”
Eight evaluators said they would definitely or probably recommend G-CEM Automix to their colleagues. The same number of evaluators said they would definitely or probably purchase the material in the future. When asked to give their overall satisfaction rating of G-CEM Automix self-adhesive resin cement, 3 rated it as excellent, 4 rated it as very good, and 5 rated it as good. One evaluator said of the ease of extruding the cement through the syringe, “Incredibly easy, couldn’t be better.”