THE ORTHODONTIC MATERIALS
INSIDER

Aging as a function of time & temperature

The accelerated aging schedule corresponding to the orthodontic
treatment ("The 10° degrees rule"
for 2 years at 37°C)

Sometimes, dreams can come true...

Pressure cooker in the oil bath.

Insulated oil bath containing pressure cooker. 1. Regulator on the cooker’s lid controlling steam escape. 2. Mercury thermometer. 3 Thermoregulator. 4. Plastic tank.

1. Wanted: a grid of brackets’ strengths and weaknesses.
An engineer’s approach.

2. Bond strength of various bracket base designs

Force needed to debond brackets:
as such (black: Kgf, median,
25% and75%); considering
base area (red, MPa).

Bases of the brackets tested
as shown in Fig.6.

The good news: with the modern means of today,
sometimes it can be cured.

a. Claude’s PET scan, September 2006 (observe white spot (carcinoma);
b. CT-scan, February 2007

2. “Cyano-” doesn’t always
kill you!
A case in point: the cyanoacrylates

3. Cyanoacrylate primers,
a way to better bonds?

Force (g) needed to debond (peel) Straight Edge™ “mini” brackets from an etched ceramic tile. Adhesives were Phase II™ and Light Bond™ with or without addition of a-ethyl cyanoacrylate (KG) and/or acetone and TEGDM

1. “Shear-peel”, peel, tension, torsion or cleavage: Which
one works better for you?

U.S. Patented debonding instruments (hand/mechanic only)

2. Modeling mechanic debonding with the help of the Velcro™ fastener

Image of the model and its geometry

1. Even when stars die, their glow persists …

Thomas M. Graber 1917 - 2007

2. Proper debonding saves money and the environment

Possible consequences of squeezing the bracket in the A (a) and B areas (b & c)

1. Celebrating 20 years of contributions to the science of orthodontic materials.

2. A self-ligation mania?

Books/manuals on self-ligation provided to the trainees.

3. Corrosion and self-ligating brackets.

Egg holder containing self-ligating
brackets and a Fe++ coloring reagent
added to oil-in-water salad dressing.

4. Materials in self-ligating brackets, yesterday and today

Sketch of In-Ovation C

1. Orthodontists are luckier than ocularists...

Discoloration auras generated by potassiumperman-ganate’s (gel)
reaction with leaching
retainers (a) and curedorthodontic adhesives (b)

2. Mending acrylic attachments

Bench bond strength tester in
which a controlled, increasing
weight (water, lead weights) pulls
a wire at the endof which can be
attached various holding devices.

1. Progress made in 30 years
•A very brave man

During three decades, Ortho-Cycle
has saved from being discarded
millions of orthodontic attachments

2. A disdained, tormented duckling has grown to be a swan: Ortho-Cycle Co. at its 30th anniversary

1. Insider's content 2002-2006
"Any orthodontist who does not take advantage of learning from this publication is denying himself
an invaluable resource"
Prof. MM Kuftinec, NY University

2. Are nonmetal reinforcements acceptable?

The breaking force of 2K glass fiber bundles when:1. uncoated or uncured, 2. cured and bent at 30° and 3. cured,
but with polymer crosslinks interrupted (broken binder).

www.biomateriale.ro

www.uic.edu/depts/dort/ortho.html

American Journal of Orthodontics
& Dentofacial Orthopedics

World Journal of Orthodontics

Journal of Clinical Orthodontics

The Angle Orthodontist