Microscopic feature of fractured implant in practical dental use

Hidenori Era, Yasuyuki Mastushita, Mayumi Miura, Katsuhiko Kishitake

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Patients suffer considerable pain from fracture of placed implants. In order to reduce the number of fracturing failures in future and to obtain a better understanding of fracturing, a fractured implant has been investigated by means of radiography, scanning electron microscopy and transmission electron microscopy from a metallurgical viewpoint. The blade type implant of Ti-5V alloy has a virgin microstructure of a low density of dislocation with a dispersion of fine precipitates. Further dislocations and twins are introduced into the implant due to repeated loading in use, resulting in possessing a large amount of lattice defects until fracturing. The dislocations are considered to assist calcium penetration and to bring about intergranular fracturing near the surface of the implant. Striations are extensively observed at a center portion of the implant, indicating that the fracturing is caused by fatigue. Microscopic investigations reveal that the fracturing is initiated by some elements such as calcium in saliva in accordance with high density of lattice defects and developed through the fatigue by repeated loading.

Original languageEnglish
Pages (from-to)1561-1565
Number of pages5
JournalMaterials Transactions
Volume45
Issue number5
DOIs
Publication statusPublished - May 1 2004

Fingerprint

Crystal defects
fracturing
Calcium
Fatigue of materials
Radiography
Dislocations (crystals)
Precipitates
Transmission electron microscopy
Microstructure
Scanning electron microscopy
calcium
saliva
striation
pain
defects
radiography
blades
precipitates
penetration
transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Microscopic feature of fractured implant in practical dental use. / Era, Hidenori; Mastushita, Yasuyuki; Miura, Mayumi; Kishitake, Katsuhiko.

In: Materials Transactions, Vol. 45, No. 5, 01.05.2004, p. 1561-1565.

Research output: Contribution to journalArticle

Era, Hidenori ; Mastushita, Yasuyuki ; Miura, Mayumi ; Kishitake, Katsuhiko. / Microscopic feature of fractured implant in practical dental use. In: Materials Transactions. 2004 ; Vol. 45, No. 5. pp. 1561-1565.
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