Clinical Evaluation of Zirconia Occlusal Veneer Fixed Partial Denture: A New Design for Posterior Resin-Bonded Fixed Partial Dentures (RBFPDs).

PURPOSE: To evaluate the clinical performance of zirconia occlusal veneer fixed partial dentures (FPDs).

MATERIALS AND

METHODS

Forty occlusal veneer FPDs (n = 10) replacing first molars were fabricated using two preparation designs (D1 and D2) and two types of zirconia: second-generation traditional zirconia (3Y-TZP) and third-generation translucent zirconia (5Y-PSZ). Design D1 involved a 1 mm occlusal reduction of the abutments, a 1 mm circumferential occlusal shoulder, and axial wall preparation of the surfaces adjacent to the missing molar, limited between the buccal and lingual line angles. The adjacent preparation in the design D2 was extended to the lingual midpoint and included an axial groove on each abutment. After resin cementation, patient and specialist satisfaction with esthetic appearance was recorded. Clinical data on fracture, debonding, and recurrent caries were collected at 1, 6, 12, and 18 months.

RESULTS

No cases of debonding or recurrent caries were observed. Two occlusal veneer FPDs in Group D1/5Y experienced complete fractures at 4 and 17 months, respectively. Only one FPD in Group D2/5Y developed a crack at the first-month follow-up. Statistical analysis showed no significant differences among the groups in fracture resistance or esthetic satisfaction.

CONCLUSION

Occlusal veneer fixed partial dentures made of second-generation zirconia provide an effective alternative to conventional treatments for replacing first molars or second premolars, particularly when adjacent abutments are intact and the patient maintains good oral hygiene.