Production is the gross value of dentistry performed at the full fee schedule before any adjustment, and collection is the cash that actually arrived — and the important structural point is that only the second one posts to the ledger.
Keeping production out of the accounting file is a deliberate choice rather than an oversight. Mirroring it in QuickBooks produces a second version of numbers the practice management system already owns, and two versions of the same figure do not check each other — they just disagree eventually, and then somebody has to decide which one to believe. The useful arrangement is one record for treatment and one for money, joined by a monthly bridge that starts at production, subtracts adjustments to reach net production, allows for the movement in what patients and insurers still owe, and lands on the cash that was actually banked. When that bridge is run every month the difference is always small and always explainable. When it is skipped for a year, the two records have quietly become two different accounts of the same business.