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The Dentra Apollo gauge is a prosthodontic measuring instrument for recording the vertical dimension of occlusion. Vertical dimension is the distance between two marked facial points, conventionally one on the fixed maxilla and one on the mobile mandible, and getting it right is one of the more consequential judgements in denture and full mouth work. Set it too low and the face collapses and the patient over-closes; set it too high and there is no freeway space, the teeth clash during speech, and the patient cannot tolerate the prosthesis. The gauge replaces eye estimation with a direct millimetre reading: two adjustable markers locate the reference points, the scale reads lower face height, and a locking mechanism holds the figure so it survives the transfer to the record.
Before use
Vertical dimension is measured in two states. Rest vertical dimension is recorded with the mandible in physiological rest position. Occlusal vertical dimension is recorded with the teeth or the record rims in occlusion. The difference between the two is the freeway space, and it is that difference, not either figure alone, that tells the clinician whether the prosthesis will be tolerated.
Establishing both figures requires the same two reference points to be located reliably on each occasion. That is what the adjustable markers do. The scale then gives a number in millimetres rather than an impression, which makes the record reproducible: the same clinician gets the same figure at the next appointment, and a second clinician or the laboratory can work to it.
The instrument belongs to a long line of prosthodontic measuring devices going back to the Willis gauge of 1935, which introduced the idea of measuring lower face height directly rather than judging it. Modern gauges keep the principle and add a locking scale.
Measuring range to be confirmed
The measuring range, graduation interval, overall dimensions and the exact steel grade are not stated here pending confirmation against the production record and material certificate. Gauges of this type are produced with different ranges, so the range should be confirmed before ordering where a particular span is needed. Ask before ordering if this figure is required.
| Stage | Action |
|---|---|
| Before first use | Remove all packaging, decontaminate and sterilise |
| Point of use | Rinse promptly so debris does not dry into the scale engraving and the locking mechanism |
| Cleaning | Process per the practice decontamination policy, with the markers moved through their travel so the slide is reached |
| Inspection | Check scale legibility, marker tip condition and that the lock holds a setting under light pressure |
| Lubrication | Apply instrument lubricant to the sliding mechanism where the local policy requires it |
| Sterilisation | Steam sterilise per the validated cycle for the load |
| Storage | Store dry and protected, keeping the marker tips clear of contact with heavier instruments |
| Withdrawal | Remove from service on corrosion, an illegible scale, a bent marker or a lock that will not hold |
The above is general guidance. The practice decontamination policy and current national guidance on decontamination in primary care dental practices take precedence.
Dentra is the dental instrument range from Elarix Medical. Prosthodontic measuring instruments are supplied alongside extraction forceps by figure number across adult and children's patterns, and orthodontic pliers and cutters. Every item is individually referenced and barcoded, so a repeat order is placed against a code rather than a description.
Specifications can change without notice. Ask us for the current technical file.
Ordered before 1pm Monday to Friday, dispatched the same working day from Leeds. Deliveries run Monday to Saturday, never Sunday.
UK mainland, light items: 1 to 2 working days. Heavy and bulky: 2 to 4 working days.
International orders ship on a Delivered At Place basis. Import duty, local tax and customs clearance fees are charged by the destination country and are the buyer's responsibility.
Unopened items can be returned within 30 days of delivery. Tell us before you send anything back so we can give you a returns reference.
Opened items that touch the airway cannot be returned for hygiene reasons unless they are faulty.
This does not affect your statutory rights.
Refunds are issued to the original payment method once the returned item reaches us and has been checked, normally within five working days.
Faulty items are refunded in full, including the delivery you paid.
Information on this page is provided for guidance and does not replace advice from a qualified clinician. Always read the manufacturer's instructions before use, and check that a device is suitable for the patient and the prescribed therapy.
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