Volume 8, Issue 2 (4-2023)                   J Res Dent Maxillofac Sci 2023, 8(2): 119-127 | Back to browse issues page

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Zolfagharloo F, Nasr N, Tavakkol O, Momayezinejad M. Effect of Crown Dimensions on Stress Distribution in Implant Abutment Screw: A 3D Finite Element Analysis. J Res Dent Maxillofac Sci 2023; 8 (2) :119-127
URL: http://jrdms.dentaliau.ac.ir/article-1-400-en.html
1- Private Dentistry Practice, Shiraz, Iran
2- Department of Periodontics, School of Dentistry, Shiraz Islamic Azad University, Shiraz, Iran
3- Department of Prosthodontics, School of Dentistry, Shiraz Islamic Azad University, Shiraz, Iran , omidtavakkol@yahoo.com
Abstract:   (325 Views)
Background and Aim:   This study assessed the effect of crown dimensions on stress distribution in the abutment screw upon loading using three-dimensional (3D) finite element analysis (FEA).
Materials and Methods: Eighteen finite element models were designed using Mimics, 3D-Matic, Catia, and ANSYS software programs. Implant models were designed with 8.5-, 10- and 11.5-mm fixture heights, three different vertical cantilever heights of 8, 10, and 12 mm, and two horizontal cantilever lengths of 7 and 14 mm for the mandibular first and second molars. The interaction effect of of 120 N and 20 N loads on the implant and implant crown at the site of first molar, and the interaction effect of 150 N and 25 N loads on the cantilever at the site of second molar were analyzed.
Results: By an increase in horizontal cantilever length, stress in the abutment screw, abutment, and fixture increased in all models. Stress decreased in the abutment screw and increased in the abutment and fixture by an increase in vertical cantilever. Minimum screw stress was recorded in implants with 8.5 mm fixture height, 7 mm horizontal cantilever, and 12 mm vertical cantilever. Maximum screw stress was noted in implants with 11.5 mm fixture height, 14 mm horizontal cantilever, and 8 mm vertical cantilever.
Conclusion: According to FEA, increasing the horizontal and vertical cantilever length may result in an increased risk of screw loosening and fatigue fracture due to increased stress values in the screw or in other components (abutment and fixture), respectively.
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Type of Study: Original article | Subject: Prosthodontics

1. Resnik RR, Misch CE. Diagnostic Casts, Surgical Templates, and Provisionalization. In: Misch CE, editor. Dental Implant Pros-thetics (Second Edition). St. Louis: Mosby; 2015. 1264p. [DOI:10.1016/B978-0-323-07845-0.00018-X]
2. Misch CE. ARABIC-Contemporary Implant Dentistry. 3rd ed. Elsevier Health Sciences; 2007. 1120 p.
3. Oral implantology. Glossary of implant terms. J Oral Implantol. 2007;Suppl 1:2-14.
4. Meffert RM, Langer B, Fritz ME. Dental implants: a review. J Periodontol. 1992 Nov;63(11):859-70. [DOI:10.1902/jop.1992.63.11.859] [PMID]
5. Mazurat RD, Love WB. Direct assembly of implant suprastructures. J Prosthet Dent. 1993 Aug;70(2):172-5. [DOI:10.1016/0022-3913(93)90014-F] [PMID]
6. Lee KY, Shin KS, Jung JH, Cho HW, Kwon KH, Kim YL. Clinical study on screw loosening in dental implant prostheses: a 6-year retrospective study. J Korean Assoc Oral Maxillofac Surg. 2020 Apr 30;46(2):133-42. [DOI:10.5125/jkaoms.2020.46.2.133] [PMID] [PMCID]
7. Lee JH, Cha HS. Screw loosening and changes in removal torque relative to abutment screw length in a dental implant with external abutment connection after oblique cyclic loading. J Adv Prosthodont. 2018 Dec;10(6):415-21. [DOI:10.4047/jap.2018.10.6.415] [PMID] [PMCID]
8. Agustín-Panadero R, Orozco-Varo A, Domínguez-Cardoso P, Bernabeu-Mira JC, Soto-Peñaloza D, Peñarrocha-Oltra D. Biome-chanics and Occlusion in Immediate Loading. In: Peñarrocha-Diago M, Covani U, Cuadrado L, eds. Atlas of Imme-diate Dental Implant Loading. Cham: Springer International Publishing; 2019. p. 49-67. [DOI:10.1097/01.BMSAS.0000558124.96675.8f]
9. Liu M, Li C, Liu L, Ye Y, Dastan D, Garmestani H. Inhibition of stress corrosion cracking in 304 stainless steel through titani-um ion implantation. Materials Science and Technology. 2020;36(3):284-92. [DOI:10.1080/02670836.2019.1704527]
10. De Marco G, Di Francesco F, Lanza A. Analysis and management of implant-prosthetic complications: Description of a diagnostic and therapeutic algorithm with a clinical case. J Prosthodont Res. 2018;62(3):386-90. [DOI:10.1016/j.jpor.2017.08.001] [PMID]
11. Goodacre CJ, Bernal G, Rungcharassaeng K, Kan JY. Clinical complications with implants and implant prostheses. J Prosthet Dent. 2003 Aug;90(2):121-32. [DOI:10.1016/S0022-3913(03)00212-9] [PMID]
12. Nissan J, Ghelfan O, Gross O, Priel I, Gross M, Chaushu G. The effect of crown/implant ratio and crown height space on stress distribution in unsplinted implant supporting restorations. J Oral Maxillofac Surg. 2011 Jul;69(7):1934-9. [DOI:10.1016/j.joms.2011.01.036] [PMID]
13. Kourtis S, Damanaki M, Kaitatzidou S, Kaitatzidou A, Rous-sou V. Loosening of the fixing screw in single implant crowns: predisposing factors, prevention and treatment options. J Esthet Restor Dent. 2017 Jul 8;29(4):233-46. [DOI:10.1111/jerd.12303] [PMID]
14. Kallus T, Bessing C. Loose gold screws frequently occur in full-arch fixed prostheses supported by osseointegrated im-plants after 5 years. Int J Oral Maxillofac Implants. 1994 Mar-Apr;9(2):169-78.
15. Goodacre CJ, Kan JY, Rungcharassaeng K. Clinical complications of osseointegrated implants. J Prosthet Dent. 1999 May;81(5):537-52. [DOI:10.1016/S0022-3913(99)70208-8] [PMID]
16. Huang Y, Wang J. Mechanism of and factors associated with the loosening of the implant abutment screw: A review. J Esthet Restor Dent. 2019 Jul;31(4):338-45. [DOI:10.1111/jerd.12494] [PMID]
17. Alnasser AH, Wadhwani CPK, Schoenbaum TR, Kattadiyil MT. Evaluation of implant abutment screw tightening protocols on reverse tightening values: An in vitro study. J Prosthet Dent. 2021 Mar;125(3):486-90. [DOI:10.1016/j.prosdent.2020.02.035] [PMID]
18. Kirov D, Stoichkov B. Factors affecting the abutment screw loosening. J of IMAB. 2017 Jan-Mar;23(1):1505-9. [DOI:10.5272/jimab.2017231.1505]
19. Moraes SLDd, Verri FR, Junior JFS, Almeida DAdF, Mello CCd, Pellizzer EP. A 3-D finite element study of the influence of crown-implant ratio on stress distribution. Braz Dent J. 2013 Nov-Dec;24(6):635-41. [DOI:10.1590/0103-6440201302287] [PMID]
20. Moraes SL, Pellizzer EP, Verri FR, Santiago JF Jr, Silva JV. Three-dimensional finite element analysis of stress distribution in retention screws of different crown-implant ratios. Comput Methods Biomech Biomed Engin. 2015;18 (7):689-96. [DOI:10.1080/10255842.2013.820719] [PMID]
21. Himmlová L, Dostálová T, Kácovský A, Konvicková S. Influ-ence of implant length and diameter on stress distribution: a finite element analysis. J Prosthet Dent. 2004 Jan;91(1):20-5. [DOI:10.1016/j.prosdent.2003.08.008] [PMID]
22. Tawil G, Aboujaoude N, Younan R. Influence of prosthetic parameters on the survival and complication rates of short implants. Int J Oral Maxillofac Implants. 2006 Mar-Apr;21 (2):275-82.
23. Khraisat A, Hashimoto A, Nomura S, Miyakawa O. Effect of lateral cyclic loading on abutment screw loosening of an exter-nal hexagon implant system. J Prosthet Dent. 2004 Apr;91(4):326-34. [DOI:10.1016/j.prosdent.2004.01.001] [PMID]
24. Oyar P, Durkan R, Deste G. The effect of the design of a man-dibular implant-supported zirconia prosthesis on stress distri-bution. J Prosthet Dent. 2021 Mar;125(3):502.e1-502.e11. [DOI:10.1016/j.prosdent.2020.05.027] [PMID]

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