Prosthodontics Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Eur J Prosthodont Restor Dent. 2024 Feb 29;32(1):20-27. doi: 10.1922/EJPRD_2524Emera08.
The aim of this study was to evaluate the surface wear and retention force of telescopic attachments made of zirconia primary crowns and poly-ether- ketone -ketone (PEKK) secondary crowns for 2-implant retained mandibular complete overdentures.
Ten healthy completely edentulous patients aged 55-60 years were selected for this study. Each patient received two implants in the mandibular canine regions. Maxillary conventional complete dentures were constructed against implant-retained mandibular overdentures for all patients. Zirconia- PEKK telescopic attachments were fabricated to retain the overdentures where primary copings were constructed of zirconia and secondary ones were constructed of PEKK. Retention force and surface wear were evaluated at the time of overdenture insertion (T0), and after 6 months of overdenture use (T6).
The results revealed less wear of zirconia copings compared to PEKK ones at T0 and T6. However, both materials showed insignificant wear after 6 months of overdenture use. A significant increase in retention force was observed after 6 months of overdenture use.
Within limitations of this study, PEKK may be considered a promising alternative material for telescopic secondary crowns construction combined to zirconia primary ones, regarding the wear resistance and the satisfactory retention forces.
本研究旨在评估氧化锆基牙冠和聚醚醚酮-酮（PEKK） secondary 冠制成的套筒附着体用于 2 颗种植体固位下颌全口覆盖义齿的表面磨损和固位力。
本研究选取 10 名 55-60 岁的健康全口无牙患者。每位患者下颌犬齿区植入 2 颗种植体。所有患者上颌均制作常规全口义齿，作为下颌种植体支持覆盖义齿的对照。为保留覆盖义齿，制作氧化锆-PEKK 套筒附着体，其中 primary 基台由氧化锆制成，secondary 基台由 PEKK 制成。在覆盖义齿插入时（T0）和使用 6 个月后（T6）评估固位力和表面磨损。
结果显示，在 T0 和 T6 时，氧化锆基台的磨损小于 PEKK 基台，但两种材料在覆盖义齿使用 6 个月后磨损均不明显。覆盖义齿使用 6 个月后，固位力显著增加。
在本研究的限制范围内，PEKK 可被认为是一种有前途的替代材料，可与氧化锆基台结合用于套筒 secondary 冠的制作，具有良好的耐磨性和满意的固位力。
