Preserve a suitable existing bite, or select centric relation or a reliably recorded functional reference to establish stable, reproducible maximum intercuspation. Optional freedom in centric is deliberately designed, clinically bounded tooth-contact tolerance at unchanged bite height, not a physiological jaw pathway: reference contact and intended maximum intercuspation define its limits when different; no discrepancy is needed when they coincide, and superior clinical outcomes remain unproven.
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Mosaddad et al. (2026) studied this question.
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