A 27-year-old man presented with developmental disorders in the maxillary incisors and asymmetric smile. Differential diagnosis between geminated and fused maxillary central incisors was conducted using cone-beam computed tomography (CBCT). The complexities of root canal system was handled using suitable shaping instruments and ultrasonic activation tips. Root apexes were sealed with mineral trioxide aggregate plugs. The anterior maxillary gingiva was surgically recontoured, and CAD/CAM Zirconia crowns were placed after the gingival healing phase. The combination of the 3D radiological examination, the clinical screening, and the use of a diagnostic wax-up presented a successful approach to manage this rare clinical case.

Background: This double-blind randomised controlled clinical trial evaluated the effect of adhesive strategy on the performance of resin composite restorations in non-carious cervical lesions (NCCLs) preconditioned using bioactive glass air-abrasion.Methods: One hundred teeth with NCCLs were assigned randomly into four experimental groups (n=25); A: air-abrasion + etch & rinse adhesive (AA+ER), B: air-abrasion + self-etch adhesive (AA+SE), C: etch & rinse adhesive (ER) and D: self-etch adhesive (SE). NCCLs were restored clinically using conventional resin composite placed incrementally. The lesions and restorations were evaluated at baseline, 3-months and 6-months according to the World Dental Federation (FDI) criteria. The level of statistical significance was established at p=0.05.Results: An increased retention rate was observed at 6-month recall within the AA+ER group. The retention rate of NCCLs restoration was affected significantly by the height of the NCCLs. NCCLs width and the height affected significantly the marginal adaptation of the restorations. Conclusion: Etch-and-rinse adhesive revealed a statistical improved retention rate when compared to self-etch adhesive in NCCLs pre-conditioned with bioactive glass air-abrasion at 6-months recall. NCCLs’ physical characteristics affected significantly the resin composite restoration performance.This clinical trial was registered in clinicaltrial.gov clinical registry under protocol # NCT04578717.