An interventional study of Conventional Alginate Impression and TRIOS 3 Intraoral Scanner in Dental Impression Techniques, sponsored by Hue University of Medicine and Pharmacy. Completed at 1 site in Vietnam. Open to participants aged 18 Years to 24 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-07-15.
Sponsored by Hue University of Medicine and Pharmacy · Not applicable, Interventional, and Diagnostic
Dental impressions are used to create a record of a person's teeth and oral structures. Conventional impressions are made using impression material placed in a tray, whereas digital impressions are obtained using an intraoral scanner.
This randomized clinical trial compared conventional alginate impressions with digital intraoral scanning using the TRIOS 3 and Medit i700 scanners among dental students aged 18 to 24 years. Participants were randomly assigned to one of the three impression techniques. Each participant underwent recording of both the upper and lower dental arches using the assigned technique.
The study primarily compared the chairside time required for each technique and the participants' experience immediately after the procedure. Comfort, nausea, breathing, pain, dry-mouth sensation, perceived procedure speed, overall satisfaction, and preference for conventional or digital impressions were also evaluated.
Hue University of Medicine and Pharmacy is the lead sponsor of 13 studies on the registry; 1 is open to participants now.
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants underwent maxillary and mandibular conventional impressions using alginate impression material and stock trays according to the manufacturer's instructions.
Procedure: Conventional Alginate Impression
Participants underwent full-arch maxillary and mandibular digital impressions and bite registration using the TRIOS 3 intraoral scanner according to the manufacturer's recommended scanning protocol.
Procedure: TRIOS 3 Intraoral Scanner
Participants underwent full-arch maxillary and mandibular digital impressions and bite registration using the Medit i700 intraoral scanner according to the manufacturer's recommended scanning protocol.
Procedure: Medit i700 Intraoral Scanner
Maxillary and mandibular conventional impressions were obtained using Tropical alginate impression material and stock trays. The alginate was mixed, placed in the impression tray, and used according to the manufacturer's instructions.
Maxillary and mandibular full-arch digital impressions were obtained using the TRIOS 3 intraoral scanner according to the manufacturer's recommended scanning protocol. A bite-registration scan was also obtained.
Maxillary and mandibular full-arch digital impressions were obtained using the Medit i700 intraoral scanner according to the manufacturer's recommended scanning protocol. A bite-registration scan was also obtained.
Total Chairside Procedure Time
Total chairside procedure time was measured in seconds using a digital stopwatch and calculated as the sum of the recorded procedural stages. For the conventional alginate group, the stages included maxillary mixing, maxillary impression taking, mandibular mixing, and mandibular impression taking. For the digital groups, the stages included patient and case information entry, maxillary scanning, and mandibular scanning. Bite-registration time was excluded from the total procedure time because there was no equivalent stage in the conventional alginate workflow.
Time frame: During the assigned impression procedure at the single study visit
Patient-Reported Overall Comfort During the Impression Procedure
Overall comfort during the assigned impression procedure was assessed immediately after the procedure using a 0-to-100 visual analogue scale. Higher scores indicated greater comfort.
Time frame: Immediately after completion of the assigned impression procedure
Plan to share: No
Ran from May 2025 to primary completion in Aug 2025, 3 months.
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This study is completed, as verified in Jul 2026. You cannot join it, but the record below documents what was studied.
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Hue University of Medicine and Pharmacy