NCT07282977|Enrolling By Invitation
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Sponsor study identifier
interventional
39
1 country
1
Study Start
December 2025
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Primary Completion
June 30, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Study Completion
June 30, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
The goal of this clinical trial is to find the best gingival displacement method for taking impressions of artificial full crowns with subgingival margins. The main question it aims to answer is: Which of the three common gingival displacement methods works best? Researchers will compare three methods: gingival retraction cord, gingival retraction paste, and gingival retraction cord + hemostatic gel, to see which is optimal. Participants will: Receive one of the three gingival displacement treatments during impression taking. Fill out a VAS form to rate their pain.
Registry-reported information. Elapsed time and enrollment totals alone do not measure study progress or recruitment pace.
June 30, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
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Dates and qualifiers reported by the registry. Estimated dates do not confirm that a milestone has occurred.
November 24, 2025
Actual (reported)December 2025
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
December 15, 2025
Actual (reported)June 30, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
June 30, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
horizontal sulcus width of gingival displacement
After tooth preparation, gingival displacement material was applied to each group and then silicone impressions were taken using the two-step impression technique, and die stone models were poured.The horizontal displacement width of the sulcus was measured on the cast, defined as the linear distance between the margin of the prepared tooth and the adjacent gingival replica on the cast. The mearsurement procedure was carried out with an optical microscope.
baseline
gingival sulcus bleeding
baseline
patient- reported pain
baseline
give the patients in this group the gingival displacemet treatment with retraction cord
give the patients in this group the gingival displacemet treatment with retraction paste
give the patients in this group the gingival displacemet treatment with retraction cord impregnated with hemostatic gel
After tooth preparation, the prepared abutment tooth was rinsed and dried. A preliminary impression was taken using heavy-body silicone. An appropriately sized retraction cord (Ultrapak, #000-#0) was selected and gently packed into the gingival sulcus of the prepared tooth using a cord packer. The cord was left in the gingival sulcus for 7-8 minutes. Following cord removal, light-body silicone was immediately injected around the gingival sulcus of the prepared abutment tooth and into the preliminary impression tray, followed by seating of the preliminary impression tray to obtain the final impression.
department of stomatology, Henan provincial people's hospital, People's hospital Henan university.
Zhengzhou, Henan, 450000, China
First Submitted
November 24, 2025
First Posted
December 15, 2025
Study Start
December 2025
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Primary Completion
June 30, 2026
After tooth preparation, the prepared abutment tooth was rinsed and dried. A preliminary impression was taken using heavy-body silicone. Retraction paste was injected into the gingival sulcus surrounding the prepared abutment tooth. The retraction paste was left in place for 2 minutes per the manufacturer's instructions, then thoroughly rinsed, and the prepared abutment tooth was air-dried. Light-body silicone was immediately injected around the gingival sulcus and into the preliminary impression tray, followed by seating of the preliminary impression tray to obtain the final impression.
Appropriately sized retraction cords (Ultrapak, sizes #000-#0) were pre-soaked in hemostatic gel prior to use. After tooth preparation, the prepared abutment tooth was rinsed and dried. A preliminary impression was taken using heavy-body silicone. The gel-soaked retraction cords were gently packed into the gingival sulcus using a cord packer. After 7-8 minutes, the cords were removed, followed by rinsing and drying of the prepared abutment tooth. Light-body silicone was immediately injected around the gingival sulcus and into the preliminary impression tray, followed by seating of the preliminary impression tray to obtain the final impression.
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This estimate has passed. The registry has not confirmed an actual date for this milestone.
Study Completion
June 30, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Last Updated
December 15, 2025
Record last verified: 2025-12
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