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Failure modes and materials design f...

Deng, Yan.

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Failure modes and materials design for biomechanical layer structures.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Failure modes and materials design for biomechanical layer structures./
Author:	Deng, Yan.
Description:	164 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5715.
Contained By:	Dissertation Abstracts International64-11B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3112460

Failure modes and materials design for biomechanical layer structures.
Deng, Yan.

Failure modes and materials design for biomechanical layer structures. - 164 p.

Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5715.

Thesis (Ph.D.)--University of Maryland, College Park, 2003.

Ceramic materials are finding increasing usage in the area of biomechanical replacements---dental crowns, hip and bone implants, etc.---where strength, wear resistance, biocompatibility, chemical durability and even aesthetics are critical issues. Aesthetic ceramic crowns have been widely used in dentistry to replace damaged or missing teeth. However, the failure rates of ceramic crowns, especially all-ceramic crowns, can be 1%&sim;6% per year, which is not satisfactory to patients. The materials limitations and underlying fracture mechanisms of these prostheses are not well understood.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Failure modes and materials design for biomechanical layer structures.
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035 $a (UnM)AAI3112460
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100 1 $a Deng, Yan. $3 1953558
245 1 0 $a Failure modes and materials design for biomechanical layer structures.
300 $a 164 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5715.
500 $a Directors: Isabel K. Lloyd; Brian R. Lawn.
502 $a Thesis (Ph.D.)--University of Maryland, College Park, 2003.
520 $a Ceramic materials are finding increasing usage in the area of biomechanical replacements---dental crowns, hip and bone implants, etc.---where strength, wear resistance, biocompatibility, chemical durability and even aesthetics are critical issues. Aesthetic ceramic crowns have been widely used in dentistry to replace damaged or missing teeth. However, the failure rates of ceramic crowns, especially all-ceramic crowns, can be 1%&sim;6% per year, which is not satisfactory to patients. The materials limitations and underlying fracture mechanisms of these prostheses are not well understood.
520 $a In this thesis, fundamental fracture and damage mechanisms in model dental bilayer and trilayer structures are studied. Principle failure modes are identified from in situ experimentation and confirmed by fracture mechanics analysis. In bilayer structures of ceramic/polycarbonate (representative of ceramic crown/dentin structure), three major damage sources are identified: (i) top-surface cone cracks or (ii) quasiplasticity, dominating in thick ceramic bilayers; (iii) bottom-surface radial cracks, dominating in thin ceramic bilayers. Critical load P for each damage mode are measured in six dental ceramics: Y-TZP zirconia, glass-infiltrated zirconia and alumina (InCeram), glass-ceramic (Empress II), Porcelain (Mark II and Empress) bonded to polymer substrates, as a function of ceramic thickness d in the range of 100 mum to 10 mm. P is found independent of d for mode (i) and (ii), but has a d 2 relations for mode (iii)---bottom surface radial cracking. In trilayer structures of glass/core-ceramic/polycarbonate (representing veneer porcelain/core/dentin structures), three inner fracture origins are identified: radial cracks from the bottom surface in the (i) first and (ii) second layers; and (iii) quasiplasticity in core-ceramic layer. The role of relative veneer/core thickness, d1/d 2 and materials properties is investigated for three core materials with different modulus (114--270GPa) and strength (400--1400MPa): Y-TZP zirconia, InCeram alumina and Empress II glass-ceramic. Explicit relations for the critical loads P to produce these different damage modes in bilayer and trilayer structures are developed in terms of basic material properties (modulus E, strength, hardness H and toughness T) and geometrical variables (thickness d and contact sphere radius r). These experimentally validated relations are used to design of optimal material combinations for improved fracture resistance and to predict mechanical performance of current dental materials.
590 $a School code: 0117.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Health Sciences, Dentistry. $3 1019378
690 $a 0794
690 $a 0567
710 2 0 $a University of Maryland, College Park. $3 657686
773 0 $t Dissertation Abstracts International $g 64-11B.
790 1 0 $a Lloyd, Isabel K., $e advisor
790 1 0 $a Lawn, Brian R., $e advisor
790 $a 0117
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3112460