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Clinical Trials in Taiwan / NCT07637864
Active, not recruiting Observational

Buccal Prosthetic Contour Angles and Peri-Implant Tissue Changes Around Dental Implants

NCT07637864 · tracked via the Priya Life Science Taiwan tracker
Sponsor
Chang Gung Memorial Hospital
Phase
Observational
Started
2019-11-13
Last updated
2026-06-10

Condition(s) studied

Dental ImplantsEarly Peri-Implant Bone RemodelingPeri-Implant Soft Tissue Remodeling

Investigational drug(s) / intervention(s)

Implant-Supported Prosthetic Restoration

Implant-Supported Prosthetic Restoration: Participants included in this retrospective observational cohort study received routine implant-supported prosthetic rehabilitation with bone-level dental implants restored using customized abutments and screw-retained or screwmentable prostheses. Prosthetic contour configuration and buccal profile angles at different supraplatform vertical zones (overall emergence angle, 0-2 mm profile angle, and 2-4 mm profile angle above the implant platform) will be evaluated using cone-beam computed tomography (CBCT) and radiographic analysis. Clinical and radiographic follow-up data obtained during routine maintenance care up to 1 year after prosthetic loading will be retrospectively analyzed to assess associations between prosthetic contour characteristics and peri-implant hard and soft tissue remodeling.

Study summary

This retrospective observational study aims to evaluate the association between buccal prosthetic profile angles at different supraplatform zones and peri-implant tissue changes around bone-level dental implants restored with customized abutments and crowns. The main questions it aims to answer are:

Whether prosthetic profile angles within different vertical zones above the implant platform (0-2 mm and 2-4 mm) demonstrate different associations with marginal bone level changes around dental implants.

Whether buccal prosthetic contour angles at different supraplatform depths are associated with peri-implant soft tissue conditions, including keratinized tissue width and mucosal changes.

Whether peri-implant phenotype-related factors, including mucosal tunnel depth, soft tissue thickness, and buccal bone thickness, are associated with peri-implant tissue remodeling.

Researchers will retrospectively analyze clinical records, intraoral photographs, radiographic images, and cone-beam computed tomography (CBCT) scans collected during routine implant treatment and follow-up care up to 1 year after prosthetic loading. Buccal prosthetic contour angles will be measured at different vertical zones above the implant platform to evaluate the biologic influence of contour configuration at different peri-implant tissue levels.

Eligibility

Sex
ALL
Min age
20 Years
Max age
—
Healthy volunteers
No
Inclusion Criteria: * Adults aged 20 years or older. * Patients receiving at least one bone-level dental implant restored with a customized abutment and screw-retained or screwmentable prosthesis. * Presence of at least one adjacent natural tooth and an opposing dentition. * Implant sites that received second-stage surgery and prosthetic restoration. * Presence of at least 2 mm of peri-implant keratinized mucosa after second-stage surgery. * No buccal or peri-implant bone dehiscence following implant placement. * Availability of complete clinical records, intraoral photographs, radiographic images, and cone-beam computed tomography (CBCT) scans with at least 1 year of follow-up after prosthetic loading. Availability of adequate radiographic quality for peri-implant hard and soft tissue measurements. Exclusion Criteria: * Uncontrolled systemic diseases or medical conditions that may affect healing, including uncontrolled diabetes mellitus, metabolic bone diseases, autoimmune diseases, or history of head and neck radiotherapy. * Current use of medications known to affect bone metabolism. * Pregnancy, planned pregnancy, or breastfeeding. * Poor-quality CBCT images or radiographic artifacts that interfere with measurement accuracy. * Incomplete clinical or radiographic follow-up records. * Poor oral hygiene or irregular supportive maintenance follow-up. * Implant sites with prosthetic or imaging conditions preventing reliable evaluation of prosthetic contour configuration or peri-implant tissue measurements.

Primary outcome measure(s)

  • Marginal Bone Level Change — Baseline(implant placement) to 1 year after prosthetic loading
    Change in peri-implant marginal bone level associated with buccal prosthetic profile angles measured at different supraplatform vertical zones (overall emergence angle, 0-2 mm profile angle, and 2-4 mm profile angle above the implant platform), evaluated using radiographic and cone-beam computed tomography (CBCT) analysis.

Trial sites (1)

FacilityCityRegionStatus
Chang Gung Memorial Hospital Taipei Taiwan

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Official registry record

This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.

View NCT07637864 on ClinicalTrials.gov ↗ ← All trials in Taiwan