• Evaluates the use of a new Y-TZP material, for the construction of 3 and 4-unit fi xed-fixed posterior and anterior all-ceramic bridges in general practice.• Discusses the satisfactory results at year one of a three-year trial.• The trial continues to monitor the restorations over a three-year period.
I N B R I E F
PRACTICEPurpose To report the results at year one of a three-year evaluation of the performance of fixed all-ceramic bridges, con structed with a yttrium tetragonal zirconia polycrystal substructure placed in adult patients in UK general dental practices and cemented using a self-adhesive resin-based cement. Methods Ethical approval was obtained. Four UK general dental practitioners were asked to recruit patients complying with the trial criteria and protocol. After obtaining informed written consent, appropriate vitality and radiographic assessments were completed and the pre-operative status of the gingival tissues noted. The teeth were prepared and bridges constructed using the same technician and laboratory procedures. Each bridge was reviewed within three months of the anniversary of its placement by a calibrated examiner together with the clinician who had placed the restoration. The examiners evaluated the integrity of the restoration, its anatomic form, marginal adaptation, surface quality, sensitivity, the condition of the adjacent gingivae, and the presence or absence of secondary caries. Results All the bridges (n = 38) examined at the first-year review were present, intact and performing well, though one small chip of the veneering porcelain was detected and in two cases an abutment tooth had been endo dontically treated through an occlusal access cavity.
The new material achieved ratings for ease of use superior to the pre-study resin-based and conventional luting materials in the dental practices of 13 UK dental practitioners.
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