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The previous impression taking technique involved the process used for a fixed bilateral space maintainer, and an impression tray was used. What was described is the standard compound impression technique for fixed bilateral space maintainers, whether they are lingual arch appliances, Nance Appliances, or anterior prosthetic appliances.
The next procedure we will describe is a technique for taking impressions for unilateral space maintainers, which we will call the nontray technique, where the impression is taken without an impression tray. Naturally, it is possible to use impression trays for impressions for unilateral appliances, and many clinicians take this approach using half-arch impression trays. The impression taking process using the half arch tray is the same as for taking a full arch impression which we just described. The choice of whether to use a half arch tray or the alternative technique without a tray is left to the preference of the practitioner.
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