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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

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Fiber reinforced composites orthodontic retainers.

A Lucchese¹, M Manuelli, L Bassani

¹Department of Orthodontics, Dental School, Vita‑Salute San Raffaele University, Milan, Italy - lucchese.alessandra@hsr.it.

Minerva Stomatologica

|October 22, 2015

Summary

Fiber-reinforced composites (FRC) show promise as orthodontic retainers. Short impregnation times (6 seconds) reduce defects, while longer times (6 minutes) enhance fiber morphology for improved durability.

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Area of Science:

Dental Materials Science
Orthodontic Technology

Background:

Orthodontic retention aims to maintain teeth alignment post-treatment.
Conventional stainless steel wires are standard but have limitations.
Fiber-reinforced composites (FRC) offer a potential alternative for orthodontic retainers.

Purpose of the Study:

To evaluate fiber-reinforced composites (FRC) as an alternative to stainless steel orthodontic retainers.
To analyze the structural characteristics of FRC retainers using Scanning Electron Microscopy (SEM).

Main Methods:

Two types of FRC retainers (Everstick® and Ribbond®) were tested.
Samples were divided into control and resin-impregnated groups (6 seconds and 6 minutes).
SEM analysis examined fiber structure, dimensions, and orientation before and after resin impregnation.

Main Results:

Unimpregnated fibers showed interwoven and straight cylindrical structures.
SEM revealed differences in fiber dimensions, number, diameter, and orientation between the two FRC types.
Preliminary resin impregnation significantly altered FRC structural characteristics.

Conclusions:

A 6-second resin impregnation minimized voids, crazes, and microcracks, enhancing resistance to oral factors.
Extended impregnation (6 minutes) further improved the morphological characteristics of FRC retainers.
Optimized resin impregnation is crucial for FRC retainer performance and durability.