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:: Volume 4, Issue 1 (Journal of Research in Dental & Maxillofacial Sciences Winter 2019) ::
J Res Dentomaxillofac Sci 2019, 4(1): 36-40 Back to browse issues page
Effect of Abutment Connection Type and Cyclic Loading on Removal Torque Value
E Jalalian1, E Hashemi * 2, SH Naser Mostufi3, AR Banifatemeh4, M Shariati4, A Pirmoazen4, S Alizadeh5
1- Associate Professor, Prosthodontics Dept, Faculty of Dentistry, Tehran Medical Sciences,, Islamic Azad University, Tehran, Iran
2- Postgraduate Student, Prosthodontics Dept, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran , Hashemi.prostho@gmail.com
3- Assistant professor, Prosthodontics Dept, Faculty of Dentistry, Tehran Medical Sciences,, Islamic Azad University, Tehran, Iran
4- Postgraduate Student, Prosthodontics Dept, Faculty of Dentistry, Tehran Medical Sciences,, Islamic Azad University, Tehran, Iran
5- Prosthodontics, Tehran, Iran
Abstract:   (1039 Views)

Background and Aim: Maintaining the primary torque of the abutment screw is a common problem related to implant-supported restorations; a failure in this respect often leads to screw loosening. The abutment screw plays a critical role in the long-term stability of restorations. This study aimed to assess the effect of two abutment connection types with and without cyclic loading on removal torque value (RTV).
Materials and Methods: A total of 24 abutments and fixtures were evaluated in this in-vitro experimental study. Two abutments with internal and external connections were tightened to fixtures using a digital torque-meter according to the manufacturerchr('39')s instructions. Half of the samples were subjected to cyclic loading with a 100-N mechanical load at a 1-Hz frequency (500,000 cycles) applied at 23±1°C with 50±5% humidity. Next, the RTV was measured for each abutment. Two-way analysis of variance (ANOVA) was used to assess the effect of the abutment system and cyclic loading on RTV. 
Results: The highest RTV belonged to the internal connection abutment without cyclic loading (22 Newton-centimeter (Ncm)), while the lowest RTV was noted with the external connection abutment subjected to cyclic loading (14 Ncm; P<0.01). There was no statistically significant interaction effect between the two variables (the abutment system and cyclic loading; P=0.839). The RTV in the internal hexagon abutments was significantly higher than that in the external hexagon abutment system (P<0.001). Cyclic loading significantly reduced the RTVs in both abutments (P<0.001).  
Conclusion: According to the results, internal connection abutments experience less screw loosening.

Keywords: Dental Implant-Abutment Design, Dental Implant Loading, Torque, Mechanical Stress
Full-Text [PDF 359 kb]   (446 Downloads) |   |   Full-Text (HTML)  (290 Views)  
Type of Study: Original article | Subject: Dental implant
* Corresponding Author Address: Islamic Azad University, Tehran, Iran
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Jalalian E, Hashemi E, Naser Mostufi S, Banifatemeh A, Shariati M, Pirmoazen A et al . Effect of Abutment Connection Type and Cyclic Loading on Removal Torque Value. J Res Dentomaxillofac Sci. 2019; 4 (1) :36-40
URL: http://jrdms.dentaliau.ac.ir/article-1-243-en.html

Volume 4, Issue 1 (Journal of Research in Dental & Maxillofacial Sciences Winter 2019) Back to browse issues page
Journal of Research in Dental and Maxillofacial Sciences
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