English translation: alternative (optional) dentines, for tooth's neck (dental neck) and opaquers
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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
Spanish term or phrase:
dentinas alternativas, de cuellos y opakers
alternative (optional) dentines, for tooth's neck (dental neck) and opaquers
The hard portion of the tooth surrounding the pulp,
covered by enamel on the crown and cementum on the root, which
is harder and denser than bone but softer than enamel, and is
thus readily abraded when left unprotected
I am afraid I can´t sort out the "de cuello " thing. Maybe you or somebody , can figure it out soon.