Ultimate tensile strength of total and self-etch adhesives: Effect of light irradiation distance.

Maan M. Nayif

doi:10.17126/joralres.2019.091

Maan M. Nayif Department of Conser-vative Dentistry, College of Dentistry, Mosul University, Mosul, Iraq.

DOI: https://doi.org/10.17126/joralres.2019.091

Abstract

Objective: To evaluate the ultimate tensile strength (UTS) of total and self- etch adhesives irradiated at different distances. Materials and Methods: Sixty cylindrical specimens of 0.78mm diameter and 10 mm length were prepared of two types of adhesive systems total etch Excite DSC (EX – Ivoclar Vivadent, Schaan, Liechtenstein) and one-step self-etch Clearfil S3 Bond (S3, Kuraray Medical Inc., Tokyo, Japan). Specimens of each adhesive were divided into three groups according to the light irradiation distance (0, 2, 4mm) (n=10). Each specimen was attached to universal testing machine (Digital Force Gauge, IMADA CO., LTD, Japan) and loaded at cross head speed of 1mm/min until failure. Data were analyzed using two-way ANOVA and Independent Student t-test at p< 0.05. Results: Mean UTS for total etch (24.63, 18.19, 17.26 Mpa) and for self-etch (12.68, 8.53, 7.58Mpa) at (0, 2, 4mm) distances. Specimens irradiated directly show significantly the highest UTS while those irradiated at 4mm show the lowest values (p<0.05). Excite DSC total etch adhesive have higher UTS than Clearfil S3 self-etch adhesive regardless of irradiation distance (p<0.05).Conclusions: The UTS of the evaluated adhesives was light irradiation distance and adhesive system dependant.

References

1. Ilie N, Stark K. Effect of different curing protocols on the mechanical properties of low-viscosity bulk-fill composites. Clin Oral Investig. 2015; 19(2):271-9.
2. Araújo-Neto VG, Nobre CFA, De Paula DM, Souza LC, Silva JC, Moreira MM, Picanço PRB, Feitosa VP. Glycerol-dimethacrylate as alternative hydrophilic monomer for HEMA replacement in simplified adhesives. J Mech Behav Biomed Mater. 2018;1(82):95-101.
3. Hosaka K, Nakajima M, Takahashi M, Itoh S, Ikeda M,Tagami J, et al. Relationship between mechanical properties of one-step self-etch adhesives and water sorption. Dent Mater. 2010; 26 (4):360–7.
4. Denis AB, Diagone CA, Plepis AM, Viana RB. The effect of the polymerization initiator and light source on the elution of residual Bis-GMA and TEGDMA monomers: A study using liquid chromatography with UV detection. Spectrochim Acta Mol Biomol Spectrosc. 2015; 5 (151): 908-915.
5. Rullman I, Patyna M, Janssen B, Willershausen B. Determination of polymerization shrinkage of different composites using a photoelastic method. Am J Dent. 2017;30(1):16-22.
6. Filho JD, Poskus LT, Guimarães JGA, Barcellos AA, Silva EM. Degree of conversion and plasticization of dimethacrylate based polymeric matrices: influence of light-curing mode. J Oral Sci. 2008; 50(3): 315-321.
7. Maleknejad F, Ameri H, Manafi S, Chasteen J, Ghavamnasiri M. The effect of photoactivation time and light tip distance on the degree of conversion of light and dual-cured dentin adhesives. Indian J Dent Res. 2013; 24(2):225-8.
8. Sakano W, Nakajima M, Prasansuttiporn T, Foxton R and Tagami J. Polymerization behavior within adhesive layer of one- and two-step self-etch adhesives: A micro-Raman spectroscopic study. Dent Mater J. 2013; 32(6): 992–8.
9. Navarra CO, Cadenaro M, Frassetto A, Fontanive L, Di Lenarda R, Breschi L. Degree of Conversion of Self-etch Adhesives: In Situ Micro-Raman Analysis. Oper Dent. 2016; 41(5):501-510.
10. Pucci CR, Gu LS, Zeng C, Gou YP, Tay FR, Niu LN. Susceptibility of contemporary single-bottle self-etch dentine adhesives to intrinsic water permeation. J Dent. 2017;66:52-61.