reformulated mercury fillings making them less toxic and longer lasting. He also developed new drilling protocols which are summarized by the principle of “extension for prevention.” In other words, drill a bigger hole (extension) to give more time before the tooth needs to be retreated. This technique, although changed to some degree in modern times, is the foundation of modern dentistry. G.V. Black’s “innovations” included drilling away all the discolored tooth structure, and then creating a wedge shape within the tooth in order to place a mercury filling that would remain secure. In plain
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