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Crown angle could make or break your dental implant

NCT ID NCT07637864

Knowledge-focused Sponsor: Chang Gung Memorial Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at 100 adults who already got dental implants to see if the angle of the crown above the implant affects bone and gum health. Researchers will measure crown angles and check for bone loss and gum changes using X-rays and 3D scans. The goal is to find out which crown shapes lead to healthier implants over time.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this study could help dentists design dental crowns that reduce bone loss and improve gum health around implants.
What could go wrong
This is a small, retrospective study that only looks back at past data. It cannot prove cause and effect, and results may not apply to all patients.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 100 people

The number the study aims to enrol. It can still change while the study runs.

Started

Nov 2019

Expected to finish

Jul 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Adult patients receiving bone-level dental implant treatment with customized abutments and screw-retained or screwmentable prosthetic restorations at Chang Gung Memorial Hospital will be retrospectively included. Eligible participants will have completed two-stage implant surgery, prosthetic rehabilitation, and routine maintenance follow-up with available clinical records, intraoral photographs, radiographic examinations, and cone-beam computed tomography (CBCT) scans for at least 1 year after prosthetic loading. Implant placement, peri-implant soft tissue management, and follow-up procedures were performed under standardized clinical protocols by the same experienced clinician to minimize procedural variability. Patients with inadequate imaging quality, incomplete follow-up records, peri-implant bone dehiscence after implant placement, or systemic conditions affecting healing will be excluded.

Ages

20 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

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.

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Dental implants Early peri-implant bone remodeling Peri-implant soft tissue remodeling

Contacts and locations

Locations

  • Chang Gung Memorial Hospital

    Taipei, Taiwan

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