International Journal of Dental Sciences and Research
ISSN (Print): 2333-1135 ISSN (Online): 2333-1259 Website: http://www.sciepub.com/journal/ijdsr Editor-in-chief: Marcos Roberto Tovani Palone
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International Journal of Dental Sciences and Research. 2018, 6(2), 33-38
DOI: 10.12691/ijdsr-6-2-3
Open AccessArticle

Stress Analysis of Ceramic Laminate Veneer for Diastema Closure with Different Extensions and Different Directions of Applied Load

Adel A. El Badawy1, and Mohammed H. Abd El Aziz2

1Department of Crown and Bridge, Al – Azhar University, Cairo, Egypt

2Department of Substitutive Dental Sciences, Taibah University, Madinah, Saudi Arabia

Pub. Date: March 07, 2018

Cite this paper:
Adel A. El Badawy and Mohammed H. Abd El Aziz. Stress Analysis of Ceramic Laminate Veneer for Diastema Closure with Different Extensions and Different Directions of Applied Load. International Journal of Dental Sciences and Research. 2018; 6(2):33-38. doi: 10.12691/ijdsr-6-2-3

Abstract

Purpose: To analyze stress distribution on the IPS e. max (lithium di silicate) laminate veneer used for diastema closure with different free median extensions and different extensions of proximal preparation using two directions of applied force. Statement of the problem: Closure of large median diastema by laminate veneer will increase stress intensity on the unsupported mesial extension. Materials and Methods: Finite element model of unprepared maxillary central incisor was made, by deletion method, the labial surface was reduced by 0.5 mm. and is taken up to the height of the incisal edge (feather design), then, the basic geometric configurations of different laminate veneer designs and its dimensions in millimeters were introduced into the ANSYS software program to obtain the different nine models from three proximal extensions (1, 1.5 and 2 mm) and three unsupported median extensions ( 0.5, 1 and 1.5 mm), then the stress distributions were evaluated by applying load of 100 N at two angulations( 60° and 125°). Results: In case of 60° applied load the highest stress value was recorded in Model 3 (veneer with 1 mm labio – palatal extension with 1.5 free median extension, 30.95 Mpa) where The lowest stress value was recorded in Model 7 (veneer with 2 mm labio – palatal extension with 0.5 free median extension, 20.15 Mpa). Statistically, there was a significant difference between tested models (P at the level 0.05) except in cases of model 1, 4 and 7 which exhibited no statistical significant difference (P > 0.05). In case of 125° applied load the highest stress value was recorded in Model 3 (veneer with 1 mm labio – palatal extension with 1.5 free median extension, 53.61 Mpa) where The lowest stress value was recorded in Model 7 (veneer with 2 mm labio – palatal extension with 0.5 free median extension, 39.27 Mpa). Statistically, there was a significant difference between tested models (P at the level 0.05) except in cases of model 4, 5 and 8 which exhibited no statistical significant difference (P > 0.05). Conclusion: Stress is concentrated on the free median extension, incisal edge, and the mesio - labio - incisal point angle. The stress intensity increase in the following cases: - (1) increase in free median extension of the veneer, (2) increase in angulation of applied force, (3) decrease in proximal extension of laminate veneer.

Keywords:
stress analysis diastema closure laminate veneer

Creative CommonsThis work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

References:

[1]  Keene HJ. Distribution of diastemas in the dentition of man. Am J Phys Anthropol. 1963; 21: 437-441.
 
[2]  Shirish MB, Chanchal S, Prashant B. Closing a Large Maxillary Median Diastema using Bapat Power Arm. Inter J Clin Ped Dent.2017; 10(2): 201-204.
 
[3]  Hahnel S. Surface characterization of dental ceramics and initial streptococcal adhesion in vitro. Dent Mater. 2009; 25: 969-975.
 
[4]  Spear F, Holloway J. Which all-ceramic system is optimal for anterior esthetics? J Am Dent Assoc.2008; 139: 19-24.
 
[5]  Denry I, Holloway JA. Ceramics for Dental Applications: A Review. Materials.2010; 3: 351-368.
 
[6]  Tang X. Effects of ageing on surface textures of veneering ceramics for zirconia frameworks. J Dent.2012; 40: 913-920.
 
[7]  Shenoy A, Shenoy N. Dental ceramics: An update. J Conserv Dent. 2013; 13: 195-203.
 
[8]  Jeffrey SR. Full veneer versus traditional veneer preparation: A discussion of interproximal extension. J Prosthet Dent. 1997; 78: 545-9.
 
[9]  Radz GM. Minimum thickness anterior porcelain restorations. Dent Clin North Am. 2011; 55(2): 353-370.
 
[10]  Vanlioğlu B, Özkan Y. Minimally invasive veneers: current state of the art Clinical, Cosmetic and Investigational. Dent J. 2014; 6: 101-107.
 
[11]  Garber DA. Porcelain veneer to prepare or not prepare? That is the question. Conl Esthet Dent. 1996; 2: 1-7.
 
[12]  Chalifoux PR. porcelain veneers. Curr opin cosmet Dent. 1994; 58-66.
 
[13]  Rubbins JW. Porcelain veneer: Fundamental of operative dentistry, contemporary approach. Chicago, Quintessence publishing co, 1996; 849-71.
 
[14]  Gribble AR. Multiple diastema management, an interdisciplinary approach. J Esthet Dent. 1994; 6:97-102.
 
[15]  Eraslan O, Aykent F, Yücel MT, Akman S. The finite element analysis of the effect of ferrule height on stress distribution at post-and-core-restored all-ceramic anterior crowns. Clin Oral Invest. 2009; 13: 223-227.
 
[16]  Tada S, Stegaroiu R, Kitamurs E, Miyakawa O, Kusakari H. Influence of implant design and bone quality on stress/ strain distribution in bone around implants: a 3-dimensional finite element analysis. Int J Oral Maxillofac Implants. 2003; 18: 357-368.
 
[17]  N. Gopi Chander, MDS1 & T. V. Padmanabhan, MDS2 Finite Element Stress Analysis of Diastema Closure with Ceramic Laminate Veneers. J Prosthod. 2009; 18: 577-581.
 
[18]  Eraslan O, Aykent F, Yücel MT, Akman S. The finite element analysis of the effect of ferrule height on stress distribution at post-and-core-restored all-ceramic anterior crowns. Clin Oral Invest. 2009; 13: 223-227.
 
[19]  Li LL, Wang ZY, Bai ZC, Mao Y, Gao B, Xin HT. Three-dimensional finite element analysis of weakened roots restored with different cements in combination with titanium alloy posts. Chin Med J 2006; 119: 305-11.
 
[20]  Fernando Z, Davide A, Roberto S, Valeria F, Raffaella A, Antonio A. Influence of tooth preparation design on the stress distribution in maxillary central incisors restored by means of alumina porcelain veneers: A 3D-finite element analysis. J Dental Mater 2005; 21: 1178-1188.
 
[21]  Shihab AR, Raheel Malik, Stephen MD. Stress Analysis of Occlusal Forces in Canine Teeth and Their Role in the Development of Non-Carious Cervical Lesions: Abfraction. Int j Dent. 2012; 2012: 1-7.
 
[22]  Oguz E, Ozgur I, Asli S. The effect of framework design on stress distribution in implant supported FPDs: A 3-D FEM study. Eur J Dent. 2010; 4(4): 374-82.
 
[23]  Rouse, j. Full veneer versus traditional veneer preparation: A discussion of interproximal extension. J Prosthet Dent 1997; 78: 545-9.
 
[24]  Friedman M J. A 15 year review of porcelain veneer failures – A clinician’s observations. Compend Contin Educ Dent 1998; 19: 625-36.
 
[25]  Castelnuovo J. Fracture load and mode of failure of ceramic veneers with different preparations. J prosthet Dent. 2000; 83: 171-80.
 
[26]  Seymour K. Stresses within porcelain veneers and the composite lute using differen preparation designs. J Prosthod. 2001; 10: 16-21.
 
[27]  khatib D. Fracture load of two cad/cam ceramic veneers with different preparation designs. Cairo Dental Journal.2009; 25: 425:432.
 
[28]  Zarone F, Sorrentino R, Apicella D. Valentino B, Ferrari M, Aversa R et al. Evaluation of the biomechanical behavior of maxillary central incisors restored by means of endocrowns compared to a natural tooth: a 3D static linear finite element analysis. Dent. Mater. 2006; 22: 1035-44.
 
[29]  Troedson M, Dérand T. Shear stresses in the adhesive layer under porcelain veneers. A finite element method study. Acta Odontol. Scand. 1998; 56: 257-262.
 
[30]  Lin, T. Fracture resistance and marginal discrepancy of porcelain laminate veneers influenced by preparation design and restorative material in vitro. J Dent.2012; 40: 202-209.
 
[31]  Chander T, Padmanabhan V. Finite element stress analysis of diastema closure with ceramic laminate veneers. J Prosthod.2009; 18: 577-581.