Effect of preparation design for all-ceramic restoration on maxillary premolar: a 3D finite element study

Ebrahim Maghami; Ehsan Homaei; Khalil Farhangdoost; Edmond Ho Nang Pow; Jukka Pekka Matinlinna; James Kit-Hon Tsoi

doi:10.1016/j.jpor.2018.04.002

Effect of preparation design for all-ceramic restoration on maxillary premolar: a 3D finite element study

Ebrahim Maghami
, Ehsan Homaei
, Khalil Farhangdoost
, Edmond Ho Nang Pow
, Jukka Pekka Matinlinna
, James Kit-Hon Tsoi

Division of Dentistry (L5)

Ferdowsi University of Mashhad
University of Hong Kong

Research output: Contribution to journal › Article › peer-review

Abstract

Purpose: The aim of this study was to investigate and quantify the effect of preparation design parameters on a premolar restored with two different CAD/CAM ceramic crowns by three-dimensional finite element analysis (FEA).

Methods: A restored human first premolar was digitized by a micro-CT scanner and a 3D model was created by a medical image processing software (Mimics). Following segmentation, dentine and ceramic were extracted by a surface meshing software (3-matic). Models with different preparation designs with three convergence angles (6°, 12° and 20°) and two preparation heights (3.1mm and 4.1mm) were produced. Mesh generation for models was performed in IA-FEMesh software with a lithium disilicate glass ceramic (LD, E=95.9GPa) and a polymer-infiltrated ceramic (PIC, E=30.1GPa) as the restorative materials. A 5-mm diameter stainless steel hemisphere was employed as an indenter. Twelve models were analyzed numerically in Abaqus™.

Results: The results indicated that preparation height was found to be a major factor affecting stress distribution in different components. In all models, the maximum principal stress of the ceramic crowns was found in contact area against the indenter. This stress was lesser in the longer abutment than the shorter one and it was greater for LD ceramic. Convergence angle had limited effect on stress distribution of ceramic crown in all models.

Conclusions: The preparation height appeared to play a more important role in the stress distribution of ceramic crown than the convergence angle.

Original language	English
Pages (from-to)	436-442
Number of pages	7
Journal	Journal of Prosthodontic Research
Volume	62
Issue number	4
Early online date	3 May 2018
DOIs	https://doi.org/10.1016/j.jpor.2018.04.002
Publication status	Published - 16 Oct 2018

Keywords

bicuspid
ceramics
computer-aided design
crowns
dental materials
dental restoration
finite element analysis
maxilla

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10.1016/j.jpor.2018.04.002

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title = "Effect of preparation design for all-ceramic restoration on maxillary premolar: a 3D finite element study",

abstract = "Purpose: The aim of this study was to investigate and quantify the effect of preparation design parameters on a premolar restored with two different CAD/CAM ceramic crowns by three-dimensional finite element analysis (FEA).Methods: A restored human first premolar was digitized by a micro-CT scanner and a 3D model was created by a medical image processing software (Mimics). Following segmentation, dentine and ceramic were extracted by a surface meshing software (3-matic). Models with different preparation designs with three convergence angles (6°, 12° and 20°) and two preparation heights (3.1mm and 4.1mm) were produced. Mesh generation for models was performed in IA-FEMesh software with a lithium disilicate glass ceramic (LD, E=95.9GPa) and a polymer-infiltrated ceramic (PIC, E=30.1GPa) as the restorative materials. A 5-mm diameter stainless steel hemisphere was employed as an indenter. Twelve models were analyzed numerically in Abaqus{\texttrademark}.Results: The results indicated that preparation height was found to be a major factor affecting stress distribution in different components. In all models, the maximum principal stress of the ceramic crowns was found in contact area against the indenter. This stress was lesser in the longer abutment than the shorter one and it was greater for LD ceramic. Convergence angle had limited effect on stress distribution of ceramic crown in all models.Conclusions: The preparation height appeared to play a more important role in the stress distribution of ceramic crown than the convergence angle.",

keywords = "bicuspid, ceramics, computer-aided design, crowns, dental materials, dental restoration, finite element analysis, maxilla",

author = "Ebrahim Maghami and Ehsan Homaei and Khalil Farhangdoost and Pow, \{Edmond Ho Nang\} and Matinlinna, \{Jukka Pekka\} and Tsoi, \{James Kit-Hon\}",

year = "2018",

month = oct,

day = "16",

doi = "10.1016/j.jpor.2018.04.002",

language = "English",

volume = "62",

pages = "436--442",

journal = "Journal of Prosthodontic Research",

issn = "1883-1958",

publisher = "Japan Prosthodontic Society",

number = "4",

}

TY - JOUR

T1 - Effect of preparation design for all-ceramic restoration on maxillary premolar

T2 - a 3D finite element study

AU - Maghami, Ebrahim

AU - Homaei, Ehsan

AU - Farhangdoost, Khalil

AU - Pow, Edmond Ho Nang

AU - Matinlinna, Jukka Pekka

AU - Tsoi, James Kit-Hon

PY - 2018/10/16

Y1 - 2018/10/16

N2 - Purpose: The aim of this study was to investigate and quantify the effect of preparation design parameters on a premolar restored with two different CAD/CAM ceramic crowns by three-dimensional finite element analysis (FEA).Methods: A restored human first premolar was digitized by a micro-CT scanner and a 3D model was created by a medical image processing software (Mimics). Following segmentation, dentine and ceramic were extracted by a surface meshing software (3-matic). Models with different preparation designs with three convergence angles (6°, 12° and 20°) and two preparation heights (3.1mm and 4.1mm) were produced. Mesh generation for models was performed in IA-FEMesh software with a lithium disilicate glass ceramic (LD, E=95.9GPa) and a polymer-infiltrated ceramic (PIC, E=30.1GPa) as the restorative materials. A 5-mm diameter stainless steel hemisphere was employed as an indenter. Twelve models were analyzed numerically in Abaqus™.Results: The results indicated that preparation height was found to be a major factor affecting stress distribution in different components. In all models, the maximum principal stress of the ceramic crowns was found in contact area against the indenter. This stress was lesser in the longer abutment than the shorter one and it was greater for LD ceramic. Convergence angle had limited effect on stress distribution of ceramic crown in all models.Conclusions: The preparation height appeared to play a more important role in the stress distribution of ceramic crown than the convergence angle.

AB - Purpose: The aim of this study was to investigate and quantify the effect of preparation design parameters on a premolar restored with two different CAD/CAM ceramic crowns by three-dimensional finite element analysis (FEA).Methods: A restored human first premolar was digitized by a micro-CT scanner and a 3D model was created by a medical image processing software (Mimics). Following segmentation, dentine and ceramic were extracted by a surface meshing software (3-matic). Models with different preparation designs with three convergence angles (6°, 12° and 20°) and two preparation heights (3.1mm and 4.1mm) were produced. Mesh generation for models was performed in IA-FEMesh software with a lithium disilicate glass ceramic (LD, E=95.9GPa) and a polymer-infiltrated ceramic (PIC, E=30.1GPa) as the restorative materials. A 5-mm diameter stainless steel hemisphere was employed as an indenter. Twelve models were analyzed numerically in Abaqus™.Results: The results indicated that preparation height was found to be a major factor affecting stress distribution in different components. In all models, the maximum principal stress of the ceramic crowns was found in contact area against the indenter. This stress was lesser in the longer abutment than the shorter one and it was greater for LD ceramic. Convergence angle had limited effect on stress distribution of ceramic crown in all models.Conclusions: The preparation height appeared to play a more important role in the stress distribution of ceramic crown than the convergence angle.

KW - bicuspid

KW - ceramics

KW - computer-aided design

KW - crowns

KW - dental materials

KW - dental restoration

KW - finite element analysis

KW - maxilla

U2 - 10.1016/j.jpor.2018.04.002

DO - 10.1016/j.jpor.2018.04.002

M3 - Article

C2 - 29731271

SN - 1883-1958

VL - 62

SP - 436

EP - 442

JO - Journal of Prosthodontic Research

JF - Journal of Prosthodontic Research

IS - 4

ER -

Effect of preparation design for all-ceramic restoration on maxillary premolar: a 3D finite element study

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Keywords

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