The teeth touched. Did the base stay seated?

01What the contact record leaves open

Imagine two bench records. At the same point in a lateral excursion, both show a mark on the same posterior cusp and the same incisal pin trace. Could the opposite side of the base have lifted in one case? A tooth can meet its antagonist while the base carrying it moves. The mark alone gives neither the movement of the base relative to its seat nor the magnitude or direction of the load.

The 32-page manuscript asks how anterior guidance and posterior participation interact in conventional, tissue-supported complete dentures (§14). On an articulator we can ask a related mechanical question, provided we say how we supported the bases. A denture fixed to a cast cannot demonstrate how its base would move on a yielding support.

02Three relations, three observations

Mechanical Bonwill Closure identifies two condylar references and the incisal pin–table relation. They belong to the instrument before teeth are arranged. A constructed tooth surface can subsequently restrict movement when it meets its antagonist. Becoming an active constraint does not make that tooth a primitive source of the frame.

The pin trace records a relation within the instrument. A tooth mark locates contact between two dental surfaces. A base marker, read against a separate reference on its support, records relative movement at that site. A marker can, for example, reveal local settling or lift at one side of the base. These measurements have different reference points. Even a precise map of tooth contacts does not supply the missing base measurement.

03Three ways the manuscript reads the contacts

In the paper’s distributed example, working- and non-working-side contacts must remain compatible together. A small change in support may alter which contacts can coexist. This is a sensitivity to investigate; the word “balanced” alone does not establish that a particular denture is unstable.

In the reduced example, little anterior input is present. Motion can appear uneventful because the anterior surfaces scarcely guide it. In the regulated example, anterior guidance progressively engages while posterior participation remains possible without the operator forcing contacts together. CROR further asks whether this relation persists under declared small changes.

Section 14.3 describes one lingualized arrangement. The anterior teeth are clear in centric relation and engage during excursion. The upper palatal cusps meet the lower central fossae; the construction allows working-side contact with clearance on the non-working side. These details show what the author means by permitting posterior participation. They do not establish bilateral contact as a requirement of CROR, or make tooth morphology alone a test for it.

04One contact record, three readings

Keep the tooth mark and pin trace the same. Read the base observation in each hypothetical record before deciding what the setup can support as a conclusion.

A displacement below the detection limit and a displacement never measured can look identical on a contact sheet. Only the first comes with a bound, and that bound applies to the markers, directions, load and excursion actually examined.

05How to separate base movement from tooth contact

For a bench comparison, specify the mounting, support material, seating of the base, condylar settings, excursion and applied load. Track markers on both sides of the base against references on the test support. Synchronize those readings with the contact record and pin trace. Repeat the baseline before varying one declared condition. Holding the base down by hand introduces another constraint and changes the question.

If a marker rises as a contact appears, report where and when they coincide. That observation alone cannot tell us whether the contact caused the lift: the seating, support response and load path still matter. A yielding bench support also has properties of its own; its movements are not measurements of a patient’s tissues.

06What clinical evidence can answer

Compagnoni, de Souza and Leles (2003) used kinesiography to record movement of the upper complete denture in ten wearers during clenching and unilateral chewing. Their measurement followed the denture. It did not directly measure soft-tissue deformation or test CROR; its relevance here is that denture movement was observed separately from the pattern of tooth contact.

The manuscript compares mechanical interpretations. Clinical comparisons ask how people function with their dentures. Goldstein, Kapadia and Campbell found no strong evidence for or against bilateral balanced occlusion specifically for satisfaction, preference or chewing ability. Their consensus statement does not test the manuscript’s CROR criterion. Conversely, a pattern observed on an articulator cannot establish any of those patient outcomes.

07Manuscript, clinical literature and study notes

Panagiotis Salikopoulos, Constraint Compatibility, Mechanical Bonwill Closure, and Anterior-Induced Regime Transitions in Mechanical Articulator Systems. Catalogue record for the 32-page manuscript. Read §§14.1–14.4 (pp. 15–17); Figure 3 (p. 17) and Table 1 (p. 18) compare the three regimes qualitatively. §§15–15.1 (pp. 17–20) give the formal conditions; §§17–19 (pp. 28–31) distinguish qualitative bench accounts from independent clinical or statistical validation.

G. Goldstein, Y. Kapadia, S. Campbell. Complete Denture Occlusion: Best Evidence Consensus Statement. Journal of Prosthodontics, 2021;30(S1):72–77. DOI: 10.1111/jopr.13309.

The three records and proposed bench comparison were developed for this site study on 7 November 2026. They are hypothetical, not new measurements.

This study covers conventional tissue-supported complete dentures. Removable partial dentures and implant-retained designs require their own account of support and retention.