The first material used for orthodontic TADs was:

 # The first material used for orthodontic TADs was:
A. Titanium
B. Stainless Steel 
C. Vitallium
D. Nickel - Chromium

The correct answer is C. Vitallium.

To date, three types of materials have been used for orthodontic TADs: titanium alloy, stainless steel
and vitallium. Vitallium was the first material used for orthodontic TADs. However, due to undesirable biocompatibility and a higher failure rate, vitallium was gradually replaced by titanium alloy. Stainless steel is also used for orthodontic mini-implants and recent evidence indicates that the success rate is similar between titanium alloy and stainless steel mini-implants. Nowadays, due to high biocompatibility of titanium, orthodontic TADs made of titanium alloy are most frequently used in clinical practice.

Reference: Clinical Insertion Techniques of Orthodontic Temporary Anchorage Devices, Wiley Blackwell

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