Description

3M ESPE RelyXTM Unicem 2 Automix Self-Adhesive Resin Cement is a dual-cured, self-adhesive resin cement. It is indicated for final cementation of all-ceramic, composite, or metal inlays onlays, crowns and bridges, and posts as well as restorations cemented to implant abutments. It is not recommended for veneer cementation. 3M ESPE RelyX Unicem 2 Automix Cement is available in automix syringes in three shades: A2 Universal, A3 Opaque, and Translucent. 3M ESPE RelyX Unicem 2 Automix Cement is based on the same chemistry as RelyX Unicem Self Adhesive Resin Cement (see page 2). The improved formulation offers even more convenience due to its automix delivery system. The kit includes one 8.5 g syringe (translucent, A2 Universal or A3 Opaque), 10 regular mixing tips and 5 endo mixing tips manufacturer’s instruction, and a technique card.

Clinical Evaluation Protocol

More than 500 restorations were cemented with RelyX Unicem 2 Automix Self-Adhesive Resin Cement by fi ve dentists at Enspire Dental beginning in August 2010. The restorations include ceramic inlays, onlays, bridges, ceramic and PFM crowns, posts, and CAD/CAM restoration (Figure 1). One hundred and forty five restorations were recalled and the following categories evaluated: lack of sensitivity, marginal discoloration, and retention (debonding). Each category was rated on a scale of 1-5: 1=poor, 2=fair, 3=good, 4=very good, 5=excellent.

Unique Features

3M ESPE RelyX Unicem 2 Automix Cement is a versatile cement with easy dispensing. Th e dual-barrel syringe accepts short mixing tips that minimize waste and dispense the cement directly into the restoration. Angled intraoral tips or endo tips attach to the mixer for placement of cement into the prepared tooth. These tips are especially useful for cementation of inlays/onlays and posts. The shades provided are adequate for most clinical situations. Compared to the original RelyX Unicem packaged in capsules, this material is less viscous, allowing easier seating of restorations. A very brief (1-2 second) tack cure from the facial and lingual surfaces allows for easy clean-up of excess cement. Consultants appreciated the advantage offered by room temperature storage.

Clinical Observations

Lack of Sensitivity
To date only four patients reported slight to moderate post operative sensitivity shortly after cementation. In two cases the post-op sensitivity subsided in less than three weeks and in two patients the crowns debonded shortly after cementation (Figure 2).
Marginal Discoloration
None of the restorations recalled exhibited any marginal discoloration at one year.
Retention
Among the 500 restorations cemented, six posterior crowns (1.2%) debonded over the fi rst 12 months (Figure 2).

Summary

RelyX Unicem 2 received a 98% rating at one year and has performed extremely well.