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Related Concept Videos

Teeth01:15

Teeth

605
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
605

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Updated: Aug 31, 2025

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
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Bruxism's Implications on Fixed Orthodontic Retainer Adhesion.

Anca Labuneț1, Adriana Objelean1, Oana Almășan2

  • 1Prosthetic Dentistry and Dental Materials Department, Iuliu Hațieganu University of Medicine and Pharmacy, 31 Avram Iancu Street, 400083 Cluj-Napoca, Romania.

Dentistry Journal
|August 25, 2022
PubMed
Summary
This summary is machine-generated.

This study found that ormocer adhesives showed less micro-infiltration than composite adhesives in fixed orthodontic retainers under simulated bruxism conditions. Ormocer retainers also demonstrated better durability against grinding forces.

Keywords:
adhesionbruxismfixed retentionorthodontics

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Area of Science:

  • Orthodontics
  • Dental Materials Science
  • Biomaterials Engineering

Background:

  • Fixed retainers are crucial for maintaining orthodontic treatment results.
  • Bruxism can compromise the integrity and longevity of fixed orthodontic retainers.

Purpose of the Study:

  • To compare the efficacy of an ormocer and a flowable composite adhesive for fixed orthodontic retainers.
  • To evaluate adhesive performance under simulated bruxism and normal mastication using a dual-axis chewing simulator.

Main Methods:

  • Eighty human teeth were utilized, simulating periodontal tissues.
  • Mechanical cycling (120,000 cycles) mimicked 6 months of clinical use.
  • Adhesive Remnant Index (ARI) assessed bond strength, and stereomicroscopy evaluated micro-infiltration.

Main Results:

  • Ormocer adhesives exhibited significantly lower mean micro-infiltration (0.13) compared to composite adhesives (0.31) under bruxism simulation.
  • While one composite sample failed during mastication, three ormocer and one composite sample failed under bruxism conditions.

Conclusions:

  • Ormocer adhesives are superior to flowable composites in resisting micro-infiltration in fixed retainers under simulated bruxism.
  • Ormocer demonstrates better material stability and reduced leakage potential compared to composite in demanding oral environments.