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Periodontal and prosthodontic outcomes of zirconia single crowns and FPDs with biologically oriented preparation
Blanca Serra-Pastor1, Ignazio Loi2, Carla Fons-Badal1
1Prosthodontic and Occlusion Unit, Department of Stomatology, Faculty of Medicine and Dentistry, University of Valencia (UV), Gascó Oliag 1, 46010, Valencia, Spain.
Objectives:
The purpose of this prospective clinical study was to evaluate the 10-year performance of zirconia single crowns and fixed partial dentures placed on teeth prepared with the BOPT, assessing periodontal and prosthodontic parameters.
Materials And Methods:
The sample (33 patients) was divided into 2 groups: 39 abutment teeth supporting single crowns and 52 abutment teeth supporting fixed partial dentures. A control group consisting of untreated antagonist teeth was included. Periodontal parameters were gingival margin stability, gingival index, plaque index, and probing depth; all were recorded annually. Additional parameters such as gingival thickness, biological and mechanical complications, and patient satisfaction were also analyzed.
Results:
After 10 years, 94.9% of single crowns and 90.4% of fixed partial dentures exhibited no gingival recession. The mean gingival index was 0.5 for single crowns and 0.69 for fixed partial dentures. The mean plaque index remained below 1 in both groups. Probing depth was <3 mm in 94% to 97% of the sample. Gingival thickness increased by 0.44 mm in the single-crown group and by 0.49 mm in the fixed partial dentures group. Low rates of biological and mechanical complications were observed in both groups.
Conclusions:
Within the limitations of this 10-year prospective study, zirconia restorations fabricated with the BOPT demonstrated favorable periodontal health and clinical stability, with no significant differences between restoration types.
Clinical Significance:
This study indicates that the biologically oriented preparation technique (BOPT) is a reliable option for zirconia single crowns and fixed partial dentures. BOPT was associated with stable gingival margins, increased buccal gingival thickness, low complication rates, and favorable periodontal health, supporting its use when long-term soft tissue stability and esthetic integration are desired.