Prosthetic complications with zirconia single-piece implants using different cementation methods
7964A ePOSTER BASIC RESEARCH
Background: Dental implants as well as their prosthetic components fabricated out of zirconia have become a widely discussed treatment option within implant dentistry. However, scientific data on their long-term stability so far are scarce.
Aim/Hypothesis: This study aimed to investigate the impact of different cementation methods on the occurrence of prosthetic complications with CAD/CAM-fabricated monolithic lithium-disilicate crowns of incisors after artificial aging.
Materials and Methods: Twenty single-piece zirconia implants of 4 mm diameter and 12 mm in length, were optically scanned and standardised monolithic lithium-disilicate upper left incisor crowns were fabricated. The implants were embedded in acrylic resin in a 135° angle to the horizontal plane. The crowns were then either adhesively (Group A, n = 10) or with a resin modified glass ionomer cement (Group B, n = 10) mounted onto the implants. All specimen underwent a process of artificial aging consisting of thermal stress (3000 cycles between 5°C and 55°C) and mechanical exposure in a chewing simulator (100N, 1.2 × 106 cycles), corresponding to five years of clinical application. Potential prosthetic complications were documented.
Results: The five-year survival rate of all samples was 100%, no cracks, fractures, de-cementations or chippings occurred during the observation period. All specimens in both groups showed grinding facets.
Conclusions and Clinical Implications: In this preclinical study the type of crown fixation did not affect the occurrence of prosthetic complications of monolithic lithium-disilicate crowns mounted on zirconia single-piece implants after artificial ageing of up to five years.
Keywords: zirconia implant, lithium disilicate crown, all ceramic, CAD-CAM, prosthetic complications
