orthodontic, orthodontics, orthodontic, orthodontist, orthodontist, ortodoncia, orthodental, ortho  
   
     
  "The Orthodontic Materials Insider" is a quarterly dedicated since 1987 to orthodontic professionals and to the renewal of their habits
and tools by ORTHO-CYCLE CO. www.orthocycle.com, a company that services, buys and sells orthodontic appliances.
Editor: Claude G. Matasa, Doctor of Chemical Engineering, Doctor of Technical Sciences, Professor of Oral Bio-Materials

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THE ORTHODONTIC MATERIALS
INSIDER

 
   
   
  (To view articles click on Month)  
 
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2011   2010   2009  
 
 
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1. Climbing the
success ladder
 
  1. Self-ligating brackets vs. the conventional ones: no difference !
Audiatur et altera pars (Latin: hear the other side)
  Buccal tubes’ bond strength
A comparison reveals unexpected differences
 
 

ls


Links

Biomaterials International
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

anniversary
Celebrating our 35th Anniversay

2. The Moor has done his duty: the Moor can go....
but still look for its next issue.
How Insider kept its promise
Norman Wahl

3. CONFESSIONS OF VIPs IN ORTHODONTICS
miki
O, tempora! O, mores
Prof. Dr. M.M. Kuftinec

tenti
Prof. Dr. Federico Tenti.
Plus ça change, plus ç’est lameme chose

Bimler
Dr. H. P. Bimler on the history
and development of the Bimler
Appliance (1999).

 


Gaps at the interface arch wire-chamfered slot allow old, loose creeping there impairing sliding


The sharper the angle of the elastomeric ligature over the arch wire, the higher the friction


Buccal and section views of two SLBs, In-Ovation R and Damon 3MX. Their empty spaces renders them resilient.

2. Can you trust Ortho-Cycle and its “Insiders” ? Others did...

3. ORTHO-ARMAMENTARIAN, OR JUST A VAIN OCTOGENARIAN?
Claude Matasa’s Insiders: exercises in futility or substantial contributions?

4. Colleagues’ biased voice


1. Today’s one-piece brackets provide higher bond strengths than the foil-mesh-based ones

Base surface measurement. Brackets on millimetric paper before and after spraying with ink. 1. Ormco’s Mini Diamond; 2. Dentaurum’s Discovery; 3. Forestadent’s Sprint; 4. Pyramid Orthodontics’ Prestige; 5. Unitek’s Miniaturized Twin; 6. ORJ Orthodontics’ VST
2. Flexible brackets and bases are a guarantee against enamel failure

The same mesh retains less adhesive (lower bond strength) when its lamination to the foil takes place under too high pressure
The ace in the hole: some brackets
and bases are flexible, others are not

3. Nylon O (polycaprolactone), and orthodontics
Break routine: it will make it easier
for you and your lab...


Dr. Matasa at AAO convention demonstrating polycaprolactone’s properties


Attachments that can be made from
Nylon O


 


Bond strength tester. 1. Fastened copolymer plate having tubes bonded to bovine teeth, tensile test; 2. Laminated mesh plate with bonded tubes bonded for shear tests; 3. Force gauge; 4. Paded support with pulleys & wire; 5.Winch


Tubes tested, mesh bases (manufacturers).

Why some tubes do not bond as expected
Just “presumptions”?


Tubes exhibiting the same mesh, but differing in depth.
To compensate, the manufacturer has etched the first’s base.


Structure of some multi-layered tubes. The red arrow represents the deformation. Maximum stress bearing
areas are marked with grey.


1. Self-ligating brackets and friction

Arrangement of a dynamometer (tubular scale) and the of the archwires used.
1. Weight to immobilize the scale;
2. Scale; 3. Parts of arch wires;
4. Sliding attachment


Arrangement allowing the recording the force opposed to the ligated bracket

2. Bond Strength’s “Mass Testing” of Orthodontic Attachments

Bond strength tester with a “teeth holder” which self adjusts to tensile by the force exerted.

3. Manufacturers encourage recycling !

In-Ovation R bracket exhibiting holes


Unitek’s Damon 3MX brackets exhibiting
dentification marks in slot

September 2009
1. “Orthodontic biomaterials. Properties and Problems”
book

2. Complications of the Tongue Cancer Treatment – A Case Report
ctscan
C G Matasa’s PET Scans, September 2006, and September 2009. The white spots reveal tumors

3. Self-ligating brackets’ malfunction:
is it due to corrosion ?


Forestadent’s Mobil Lock bracket (1979). Section, brass and then stainless steel “variable slot”


In-Ovation bracket™. a. Before corrosion;
b. Open to show source of blockage; c. Detail


Effect of a. electroless copper plating (test for passivation) and b. of corrosion on the same self-ligating bracket

4. Where are the Edward Angles and Rafael Bowens of today?


1. Self-ligating brackets, a gain for
almost everybody


GAC/Dentsply’s In-Ovation R ™bracket: view of the clip and its closeness to the base. The latter is so thin that the brackets’ welding lines are apparent.


Ormco’s Damon 3MX™ bracket: view of the sliding door and of a hole above the base destined to receive a power arm


Group of In-Ovation R™ brackets
seen as debonded.
Observe unscathed bases and mesio-
distal whitish borders of the cured adhesive.


Bases of Demon 3MX™ brackets seen after adhesive removal. The first, a, like most of the others, was very likely
de-bonded by mesio-distal attack,
in contrast with the other, b.

2. Self-ligating brackets’ malfunction:
is it due to corrosion ? II


Self ligating brackets, with and without their sliding door/clip, showing corrosion


View and section of the self-ligating brackets subjected to accelerated corrosion. The areas prone to malfunction
are shown lightly colored


 
           
 

   
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