Umgekehrt gibt es noch viele weitere Zahnschienen, die keine Aligner sind:
Zahnschutz für Sportarten wie Boxen und Eishockey
Schienen gegen Schnarchen
Schienen gegen Zähneknirschen
Good point - and one that suggests an explanation for the use of "orthodontic trays" - in a discussion of various tray-type appliances, you would have aligners as "orthodontic trays", anti-snore appliances as "oral trays" and night guards/dental splints (against grinding) as "dental trays". (I guess veneers and custom-made (sports) mouth guards would be dental too). In a context like that, I would understand "orthodontic trays" immediately.