CLINICAL EVALUATION OF GBA-400-BONDING-SYSTEM IN CLASS V FILLED WITH GRADIA^®DIRECT-LO-FLO

Method: Inclusion criteria: age ≥18 years, need of 1-2 buccal-Class V restorations with gingival wall above the gingival margin, no decayed-Class V cavities. Patients written consent to the trial was obtained. Ethical Committee Approval of Siena University was delivered.
Before applying the anaesthesia, patients were asked to rate their sensitivity perception experienced during a one-second air application from the dental unit syringe(40-65 p.s.i., 20 C°, ⊥ pulp-wall, 2cm distance), by placing a mark on a visual analog scale(0-10). Only patients scoring mild sensitivity(1-5) were evaluated for post-operative sensitivity. Next cavity preparation, GBA-400 adhesive(GC Corporation) and Gradia^® Direct LoFlow(GC Corporation) were used following manufacturers’ instructions. Recalls: day 1, day 7, month 1, month 6, year 1, month 18, year 2, year 3, year 4. Each restoration was evaluated for marginal discoloration and integrity, secondary caries, tooth vitality, retention and fracture. Clinical steps and outcomes measurements were made by two different operators.

Result: 50 Class V were filled: 7 showed mild sensitivity(2-4) before applying the anaesthesia. At day 1, 1 restoration showed sensitivity. After 1 week sensitivity was no longer reported. At month 18, 10 cases dropped out, 2 Class V restorations showed marginal discoloration and 1 case lost its vitality. At year 2 and 3, 3 and 5 cases, respectively, showed marginal discoloration and 1 vitality loss was noted. After 4 years, 3 more cases dropped out, 4 marginal discolorations, 1 lack of marginal integrity, 1 secondary caries and 1 vitality loss were observed.

Conclusion: GBA-400 adhesive in combination with Gradia^® Direct LoFlow contribute to reduce post-operative sensitivity when used to restore Class V cavities. There is an increasing marginal discoloration depending on the time Class V restoration lie in the mouth of the patient.