Fatigue properties of hollow zirconia implants

Iijima, Noriko; Homma, Shinya; Nakano, Ryotaro; Hayashi, Shota; Hirano, Tomoki; Iwamoto, Toshihiko; Yajima, Yasutomo

doi:10.4012/dmj.2020-248

Cited by 1 publication

(1 citation statement)

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“…The present results are similar to those obtained from fatigue tests using the Ankylos system 17) , but no obvious starting point was observed in the SEM images on the tensile side. When a large external force was momentarily applied due to trauma, the first fracture occurred on the compression side at the same time as the fracture on the tensile side, resulting in a different fracture surface aspect 6) . The EPMA revealed Ti on the fracture surface, suggest-ing that this was responsible for the black coloration seen on the side of the removed zirconia abutment.…”

Section: Discussionmentioning

confidence: 99%

A Case of Anterior Single Tooth Implant with Fractured Zirconia Abutment due to Trauma

Yotsuya,

Nakano,

Umehara

et al. 2024

Bull. Tokyo Dent. Coll.

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In recent years, a wide variety of materials have been used in dental implant treatment. In selecting the superstructures and abutments to be used it is important to consider their potential effect on the stability and durability of the planned implant. Excessive force applied to an implant during maintenance commonly results in complications, such as fracture of the superstructure or abutment, and loosening or fracture of the screws. This report describes a case of implant treatment for a 23-year-old man with esthetic disturbance due to trauma to the maxillary anterior teeth. The left maxillary central incisor could not be conserved due to this trauma, which had been caused by a traffic accident. After extraction, the tooth was restored with an anterior bridge. The crown of the left maxillary lateral incisor was fractured at the crown margin and, at the patient's request, implant treatment was selected as the restorative treatment for the missing tooth. A thorough preoperative examination was performed using placement simulation software. One titanium screw-type implant was placed in the maxillary left central incisor under local anesthesia. An all-ceramic crown with a zirconia frame was placed as a screw-fixed direct superstructure. At one year postoperatively, however, the superstructure and abutment became detached due to trauma. The fractured zirconia abutment was removed and replaced with a remanufactured abutment and superstructure. The patient has reported no subsequent dental complaint over the last 11 years. In this case, a surface analysis of the fractured zirconia abutment was performed. The scanned images revealed a difference in the fracture surfaces between the tensile and compressive sides, and electron probe microanalysis demonstrated the presence of titanium on the fracture surface. It was inferred that the hard zirconia abutment had scraped the titanium from the internal surface of the implant.

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Section: Discussionmentioning

confidence: 99%