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Comparison of the debonding force of metal, glass and polyethylene Fiber reinforced composite retainers: Mechanical and finite element analyses - 22/09/22

Doi : 10.1016/j.ortho.2022.100685 
Tahereh Pornamazeh 1, Allahyar Geramy 2, Soolmaz Heidari 3, Mahdi Rajabizadeh 4, Elaheh Kamali 2, Hannaneh Ghadirian 2,
1 Department of Orthodontics, Shahed University of Medical Sciences, Tehran, Iran 
2 Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran 
3 Department of Operative Dentistry, Dental Caries Prevention Research Center, Qazvin University of Medical Sciences, Qazvin, Iran 
4 AI.Nature, INRIA Startup Studio, INRIA, Paris, France 

Hannaneh Ghadirian, Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran.Department of Orthodontics, Tehran University of Medical SciencesTehranIran
Sous presse. Épreuves corrigées par l'auteur. Disponible en ligne depuis le Thursday 22 September 2022

Summary

Objective

The studies evaluating the efficiency of fiber reinforce composite (FRC) retainers are few and contradictory. This study aimed to compare the debonding force of metal, glass FRC (GFRC) and polyethylene FRC (PFRC) retainers, assess the interactions between the materials and forces, and pattern of load distribution by finite element analysis (FEA).

Materials and methods

Forty-eight sound lower incisors were collected and randomly assigned to 3 groups (n=8; each sample included 2 teeth). Next, 15mm of the three retainers (multi-stranded metal wire, GFRC, and PFRC) were bonded to the lingual surface of the teeth and debonding force was measured by a universal testing machine. For FEA, 3D models were designed. The data related to geometrical models and material properties were transferred to ANSYS software. A 187-Newton load was applied to the incisal edge of the two centrals. Then different parameters were assessed. The three groups were compared by one-way Anova and Tukey's test. Type one error was considered to be 0.05.

Results

The debonding force decreased in the order: Metal (143.71N)GFRC (108.29N)>PFRC (45.08N). The difference between metal retainer and GFRC was not significant. In contrast, PFRC group showed significantly lower debonding force compared to other groups (P<0.05). FEA showed stress peak value in metal-composite interface. Maximum total deformation was noted in central, followed by lateral and canine.

Conclusions

Glass-FRC can serve as an alternative to metal retainers as the difference in debonding force is not significant. However, the difficulty of repairing or replacing the Glass-FRC should be taken into account given the large number of failure in the interproximal dental area.

Le texte complet de cet article est disponible en PDF.

Keywords : Orthodontic retainers, Fixed lingual retainers, Orthodontic adhesives, Fiber-reinforced composite, Finite element analysis, Shear bond


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