Redefining the role of custom post and core systems: Moving beyond retention to structural reinforcement of severely compromised teeth: An in vitro study.
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引用次数: 0
Abstract
Purpose: To evaluate the reinforcing potential of custom post and core restorations of varying materials and designs on the fracture resistance and failure modes of endodontically treated maxillary first premolars.
Materials and methods: Fifty-six extracted maxillary first premolars were divided into seven groups (n = 8) based on custom post and core material and design. Three materials were investigated: lithium disilicate in classical (C) and modified (LM) designs, polyetherketoneketone (PEKK) in classical (PC) and modified (PM) designs, and zirconia in classical (ZC) and modified (ZM) designs, alongside a control group restored with zirconia crowns only. All experimental teeth underwent standardized tooth preparation and adhesive cementation and were subsequently restored with zirconia crowns. Following thermomechanical aging (10,000 thermal cycles and 240,000 cyclic loading cycles), fracture resistance was evaluated under compressive loading, failure modes were recorded, and the resulting data were statistically analyzed.
Results: A significant interaction was found between material and design. The LM group achieved the highest fracture resistance (2900.25 ± 325.36 N), closely approaching the control group (3213.12 ± 406.74 N) with predominantly favorable failure modes (62.5%-75%). The PEKK groups demonstrated comparably lower fracture resistance values (PC: 1287.63 ± 122.97 N; PM: 1132.75 ± 138.34 N) yet exhibited exclusively favorable failure modes (100%). The ZM group recorded the lowest fracture resistance (879 ± 170.35 N) with the highest prevalence of unfavorable failure modes (87.5%-100%).
Conclusion: All tested groups demonstrated clinically acceptable fracture resistance values. Lithium disilicate and PEKK custom post and core restorations each contributed to structural reinforcement in a distinct way-lithium disilicate through superior load-bearing capacity and PEKK through superior biomechanical protective capacity.
期刊介绍：
The Journal of Prosthodontics promotes the advanced study and practice of prosthodontics, implant, esthetic, and reconstructive dentistry. It is the official journal of the American College of Prosthodontists, the American Dental Association-recognized voice of the Specialty of Prosthodontics. The journal publishes evidence-based original scientific articles presenting information that is relevant and useful to prosthodontists. Additionally, it publishes reports of innovative techniques, new instructional methodologies, and instructive clinical reports with an interdisciplinary flair. The journal is particularly focused on promoting the study and use of cutting-edge technology and positioning prosthodontists as the early-adopters of new technology in the dental community.
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