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Effect of emergence angle and cement margin of implant restorations on marginal bone level: A randomized controlled clinical trial

Effect of emergence angle and cement margin of implant restorations on marginal bone level: A randomized controlled clinical trial

Status
Recruiting
Phases
Phase 1
Study type
Interventional
Source
TCTR
Registry ID
TCTR20260421001
Enrollment
33
Registered
2026-04-21
Start date
2026-04-01
Completion date
Unknown
Last updated
2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Tooth loss

Interventions

Participants receive a customized titanium abutment and a monolithic zirconia implant-supported restoration with a 30-degree emergence angle.,Participants receive a prefabricated titanium abutment and
Customized titanium abutment with 30-degree emergence angle,Prefabricated titanium abutment with 50-degree emergence angle,Customized titanium abutment with 50-degree emergence angle

Sponsors

University of Zurich, Clinic of Reconstructive Dentistry
Lead Sponsor

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Inclusion criteria

Inclusion criteria: 1. At least 18 years old 2. Need for reconstructive treatment with a dental implant in the molar area 3. Implant impression at least 8 weeks after implant placement 4. Periodontally healthy patients (periodontal probing depths less than 4 mm) (Full mouth) 5. Good oral hygiene (Plaque control record <25% (O'Leary et al. 1972) 6. Adequate control of inflammation (full mouth bleeding on probing <25% (Ainamo and Bay 1975) 7. Capability to comply with the study procedures 8. Informed consent as documented by signature

Exclusion criteria

Exclusion criteria: 1. Pregnant or lactating women 2. Smokers more than 10 cigarettes per day 3. Currently taking drugs that influence bone metabolism 4. Use of bisphosphonates in the last 4 years 5. History of malignancy, radiotherapy or chemotherapy for malignancy in the past 5 years

Design outcomes

Primary

MeasureTime frame
Marginal bone level changes from baseline (final restoration) 1-year after final restoration Millimeter changes from Cone Beam Computed Tomography (CBCT)

Secondary

MeasureTime frame
Clinical parameters 1-year after final restoration Probing depth (PD), Plaque control record (PCR), Modified Sulcus Bleeding Index (mSBI), Bleeding on probing (BOP), Keratinized mucosa (KM), Recession (REC), Crown height,Horizontal thickness of hard tissue 1-year after final restoration Millimeter changes from CBCT,Volumetric changes 1-year after final restoration Bone density from CBCT,Peri-implant health 1-year after final restoration biological complications and molecular analysis peri-implant crevicular fluid (PICF),Esthetic parameters: Pink Esthetic Score (PES)/ White Esthetic Score (WES) 1-year after final restoration PES/WES,Technical complications based on United States Public Health Service System (USPHS) 1-year after final restoration USPHS criteria,Patient-reported Outcome Measures (PROMs) 1-year after final restoration Questionnaires on Brushing discomfort, Patients' satisfaction, Overall esthetic satisfaction (OES),Clinician-reported outcome measures (ClinROMs) 1-year after final restoration Questionnaires on clinicians' satisfaction

Countries

Thailand

Contacts

Public ContactKajorn Kungsadalpipob

Department of Periodontology, Faculty of Dentistry, Chulalongkorn University

kajorn.k@chula.ac.th022188857

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 10, 2026