Findings of a Four-Year Randomized Controlled Clinical Trial Comparing Two-Piece and One-Piece Zirconia Abutments Supporting Single Prosthetic Restorations in Maxillary Anterior Region

Table 1

Missing teeth	Number and implant dimensions
Left central incisor	12 (4.00 mm–9.5 mm); 5 (4.00 mm–11 mm)
Right central incisor	11 (4.00 mm–9.5 mm); 8 (4.00 mm–11 mm)
Left lateral incisor	4 (3.3 mm–9.5 mm); 4 (3.3 mm–9.5 mm); 4 (4.00 mm–9.5 mm); 2 (4.00 mm–11 mm)
Right lateral incisor	5 (3.3 mm–9.5 mm); 2 (3.3 mm–9.5 mm); 6 (4.00 mm–9.5 mm); 3 (4.00 mm–11 mm)
Left canine	3 (4.5 mm–11 mm); 1 (4.5 mm–9.5 mm)
Right canine	2 (4.5 mm–11 mm); 2 (4.5 mm–9.5 mm)