Spacing of custom trays for complete dentures

In general, these are the spacing requirements I use for custom trays for complete dentures:

Maxillary definitive impressions I make in alginate. The custom tray is spaced using two layers of wax (3mm) over the primary cast. The spacing is recreated with greenstick during impression making in the three following areas: a layer on the posterior border and two pieces in the canine regions on the crest of the ridge.

Mandibular definitive impressions I make in zinc oxide and eugenol. The custom tray is close fitting.

If there are support problems on the denture bearing area such as mobile or flabby ridges the custom tray design is relieved with spacing or windows.

Denture Blog 51

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