Design of functionally graded dental multilayers

Abstract

A B S T R A C T This paper presents the results of a computational and experimental effort to develop crack-resistant dental multilayers that are inspired by the functionally graded dentoenamel-junction (DEJ) structure that occurs between dentin and enamel in natural teeth. The complex structures of natural teeth and ceramic crowns are idealized using flatlayered configurations. The potential effects of teeth-on-teeth contact are then modelled using finite element simulations of Hertzian contact. The resulting stress distributions are compared for a range of possible bioinspired, functionally graded architecture. The computed stress distributions show that the highest stress concentrations in the top ceramic layer of crown structures are reduced significantly by the use of bioinspired functionally graded architectures. The reduced stresses are experimentally shown to be associated with significant improvements (∼32%) in the pop-in loads. The implications of the results are discussed for the design of bioinspired dental ceramic crown structures. The bioinspired functionally graded layers are also shown to promote improvements in the critical crack size.

Functional Biomimetic Dental Restoration

“…Development of implants based on biocompatible FGMs for various applications in medical and dental fields has been emphasized [7][8][9][10][11][12][13][14][15]. FGM permits the integration of different materials without creating severe internal stresses and combines various unlike properties into a single material system (Figure 1).…”

“…Rahbar and Soboyejo [13] used computational and experimental effort to develop crack-resistant multilayered crowns that are inspired by the functionally graded DEJ structure. The calculated stress distributions revealed that the highest stress was concentrated at the ceramic outer layer of crown which then was reduced significantly toward the DEJ with the use of bioinspired functionally graded architecture.…”

“…Many applications of this innovative technology are found in medical and dental fields [7][8][9][10][11][12][13][14][15].…”

Strengthening diversity and cooperation through international collaborations: A focus on Africa, South America, and the Caribbean

“…During this period, his passion for bamboo stimulated a significant effort on its study as a source of bioinspiration for the design of robust structural materials at the nano-, micro-, and macroscales. 39 Ghavami inspired the author to engage a group of Princeton students in the development of a bamboo road bicycle (see Figure 8), which was subsequently commercialized by Sol Cycles Inc. and Boo Bicycles Inc. The late Ezekiel Odeh also fabricated bamboo bicycles in Nigeria and Ghana.…”

“…International collaborations among the United States and Africa, [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] J oint US-Africa Materials Institute (JUAMI) will be held December 10-21, 2018, in Kampala, Uganda. JUAMI features tutorials on cutting-edge energy materials topics, hands-on experiments and learning activities, and research seminars.…”