Emergence angle and profile at implant-supported crowns with and without cantilever extension: A digital study in molar sites

作者：Xiaoyu Yu, Yuan Li, Yu Xie, Mengning Bi, Hairui Li, Andrea Roccuzzo, Maurizio S. Tonetti · 发表于：Journal of Dentistry · 年份：2025 · DOI：10.1016/j.jdent.2025.106135 · 被引用次数：2 · 研究领域：Dental Implant Techniques and Outcomes、Orthodontics and Dentofacial Orthopedics、Dental Radiography and Imaging

OBJECTIVES: To compare the emergence angle between cantilever and non-cantilever digital designs for implant-supported crowns at molar sites, offering digital analysis insights for evaluating restoration strategy selection. METHODS: One hundred patients missing the first molar underwent intraoral scanning and CBCT imaging. Data were imported into digital platforms for prosthetic-driven planning and virtual design of implants, abutments and crowns. Two designs (cantilever and non-cantilever) were created for each patient. Emergence angles were measured using both 2D and 3D software. Simple and multiple linear regression models were employed to analyze associations between emergence angles and clinically relevant parameters (crown height and edentulous space). RESULTS: The mesio-distal width of first molar edentulous spaces averaged 10.5 ± 0.8 mm (range: 9.0-12.5 mm). For cantilever restorations, 2D angles measured 23.0 ± 4.5° (mesial) and 22.4 ± 4.6° (distal). Non-cantilever restorations exhibited greater angles, with 2D measurements of 29.1 ± 5.6° (mesial) and 30.4 ± 6.3° (distal) (p < 0.001). When categorizing edentulous spaces into three ranges (9.0-9.9 mm, 10.0-10.9 mm, and 11.0-12.5 mm), mesio-distal emergence angles exceeding 30° occurred in 1.6 %, 2.3 %, and 10.0 % of cantilever designs respectively, compared to 25.8 %, 54.6 %, and 58.0 % in non-cantilever designs (p < 0.001). Cantilever designs consistently produced smaller emergence angles across all edentulous space ...