FIGURE 3.
Some premier brackets of the 20th century. (A) The gold or chromium alloy Johnson friction cap;2190 (B) a SPEED™ self-ligating stainless steel bracket;91 (C) the Starfire™ single-crystal sapphire bracket;92 and (D) an Allure™ polycrystalline alumina bracket.93

Some premier brackets of the 20th century. (A) The gold or chromium alloy Johnson friction cap;21,90 (B) a SPEED™ self-ligating stainless steel bracket;91 (C) the Starfire™ single-crystal sapphire bracket;92 and (D) an Allure™ polycrystalline alumina bracket.93 

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