Analysis of stress/strain distribution in dental mini‐implants manufactured by additive manufacturing and machining

• Published in: Journal of biomedical materials research. Part B, Applied biomaterials Vol. 111; no. 10; pp. 1751 - 1762
• Main Authors: Oliveira, Thaisa Theodoro, Valente, Mariana Lima da Costa, Simões, Isadora Gazott, Batalha, Rodolfo Lisboa, Macedo, Ana Paula, Bolfarini, Claudemiro, Pauly, Simon, Reis, Andréa Cândido
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01.10.2023; Wiley Subscription Services, Inc
• Subjects: 3‐D printing; Additive manufacturing; Axial loads; Axial stress; Biomedical materials; dental implant; Dental implants; Dental prosthetics; Digital imaging; Implants; Load distribution; Machining; Manufacturing; Materials research; Materials science; mechanical stress; Photoelastic analysis; Production methods; Strain analysis; strain analysis overdenture; Strain distribution; Stress analysis; Stress concentration; Transplants & implants; strain analysis overdenture; 3-D printing; mechanical stress; dental implant
• ISSN: 1552-4973; 1552-4981
• DOI: 10.1002/jbm.b.35282

The study aimed to analyze the stress/strain distribution of new designs of mini‐implants manufactured by machining and additive manufacturing. Four designs were evaluated (Ø2.0 mm × 10 mm): Intra‐lock, helical, threaded machined (MN threaded) and threaded by additive manufacturing (AM threaded). Analysis of stress was performed through photoelastic analysis (100 N axial/oblique loads) and analysis of strain by digital image correlation (DIC) (250 N axial/100 N oblique load). Data distribution was verified using the Shapiro–Wilk test and a significance level of 5% was adopted. Quantitative data were analyzed using the non‐parametric Kruskal–Wallis test. In photoelastic analysis, the Intra‐lock mini‐implant showed the highest stresses in the cervical (104 kPa), middle (108 kPa), and apical (212 kPa) thirds. Higher stresses were observed in the oblique loading situation for all designs. For DIC analysis, axial loading, a significant difference was observed for the AM Threaded mini‐implants about the other designs in the cervical third (p = .04), with the highest strain value 47 με [10; 76]. In oblique loading, a significant difference between the mini‐implants was observed in the middle and apical thirds, with higher strains for the AM threaded design −185 με [−173; 162] (p = .009) and 242 με [87; 372] (p = .013), respectively. In general, the influence of different mini‐implant designs and the additive manufacturing method on the stress/strain was observed, in the photoelastic and DIC analysis. The evaluated designs demonstrated a lower concentration of stress/strain in the cervical region compared to the apical region, and higher stress/strain in situations of oblique load compared with axial load.