Fracture load of cantilevered implant-supported prostheses of varying heights fabricated from additively and subtractively manufactured resins.
Publisher DOI
PubMed ID
42477976
Abstract
Purpose
The purpose of this in vitro study was to evaluate the fracture load, both before and after aging, of implant-supported cantilevered prostheses with different prosthesis heights fabricated additively using an experimental resin and a commercially available resin, or subtractively from a high-impact polymer composite.Materials And Methods
Three cylindrical master files (20 mm long and 11 mm wide) were designed in three heights (7 mm, 11 mm, and 15 mm), each containing a space for a titanium-base (Ti-base) abutment. Using these files, a total of 108 specimens were fabricated from an additively manufactured resin for definitive fixed partial dentures (TR), an additively manufactured experimental resin (SA), and a subtractively manufactured high-impact polymer composite (BR) (N = 12 per material-height pair). After fabrication, the specimens and corresponding Ti-base abutments were treated according to their manufacturers' instructions and cemented with an autopolymerizing luting composite. Each group was divided into nonaged and aged subgroups (n = 6 per material-height pair). Nonaged specimens were tested to fracture, while aged specimens first underwent cyclic loading (1.2 million cycles, 50 N, 1.7 Hz) followed by the same load-to-fracture test on surviving specimens. Fracture load data were analyzed with generalized linear model analysis and Bonferroni-corrected post hoc tests (α = 0.05).Results
All aged specimens survived cyclic loading and were subjected to the load-to-fracture test. The interaction among material, prosthesis height, and aging condition affected the fracture loads (p < 0.001). Among the 11-mm nonaged specimens, BR led to the highest fracture load, whereas among the 15-mm nonaged specimens, TR resulted in the lowest values (p ≤ 0.001). For nonaged BR, 7-mm height led to the lowest values, whereas for nonaged SA, 15-mm height led to the highest values (p ≤ 0.007). In addition, 15-mm height led to higher values than 7-mm height for aged BR and SA (p ≤ 0.010). Aging reduced the fracture load of 11-mm BR (p = 0.002).Conclusions
Regardless of the aging condition, 7-mm (BR) or 11-mm (SA and TR) prosthesis heights may be considered as minimal requirements for tested materials to withstand the masticatory forces of the molar region in a cantilevered implant-supported situation. The effed of aging on measured fracture loads was minimal.
The purpose of this in vitro study was to evaluate the fracture load, both before and after aging, of implant-supported cantilevered prostheses with different prosthesis heights fabricated additively using an experimental resin and a commercially available resin, or subtractively from a high-impact polymer composite.Materials And Methods
Three cylindrical master files (20 mm long and 11 mm wide) were designed in three heights (7 mm, 11 mm, and 15 mm), each containing a space for a titanium-base (Ti-base) abutment. Using these files, a total of 108 specimens were fabricated from an additively manufactured resin for definitive fixed partial dentures (TR), an additively manufactured experimental resin (SA), and a subtractively manufactured high-impact polymer composite (BR) (N = 12 per material-height pair). After fabrication, the specimens and corresponding Ti-base abutments were treated according to their manufacturers' instructions and cemented with an autopolymerizing luting composite. Each group was divided into nonaged and aged subgroups (n = 6 per material-height pair). Nonaged specimens were tested to fracture, while aged specimens first underwent cyclic loading (1.2 million cycles, 50 N, 1.7 Hz) followed by the same load-to-fracture test on surviving specimens. Fracture load data were analyzed with generalized linear model analysis and Bonferroni-corrected post hoc tests (α = 0.05).Results
All aged specimens survived cyclic loading and were subjected to the load-to-fracture test. The interaction among material, prosthesis height, and aging condition affected the fracture loads (p < 0.001). Among the 11-mm nonaged specimens, BR led to the highest fracture load, whereas among the 15-mm nonaged specimens, TR resulted in the lowest values (p ≤ 0.001). For nonaged BR, 7-mm height led to the lowest values, whereas for nonaged SA, 15-mm height led to the highest values (p ≤ 0.007). In addition, 15-mm height led to higher values than 7-mm height for aged BR and SA (p ≤ 0.010). Aging reduced the fracture load of 11-mm BR (p = 0.002).Conclusions
Regardless of the aging condition, 7-mm (BR) or 11-mm (SA and TR) prosthesis heights may be considered as minimal requirements for tested materials to withstand the masticatory forces of the molar region in a cantilevered implant-supported situation. The effed of aging on measured fracture loads was minimal.
Date Issued
2026-07-20
Publication Type
Article
Subject(s)
Subjects
additively manufactured resin
•
cantilevered implant‐supported prostheses
•
fracture load
•
prosthetic height space
•
subtractively manufactured resin
Language(s)
en
Author(s)
Al-Johani, Hanan |
Journal
Journal of Prosthodontics
Publisher
Wiley
ISSN
1532-849X
1059-941X
Access(Rights)
open.access