Tooth Diseases
Conditions
Brief summary
There are two choices of restorations and implant abutments connection now: cemented and screw-retained.The excess cement, which would be difficult to completely remove, might lead to series of biological complications. The angulated screw channel (ASC) abutments, which recently introduced by Nobel Biocare , largely address the problem with visible screw access that may compromise esthetics. However, all of the present studies were clinical reports, thus the clinical efficacy of ASC abutments still needs the verification of evidence-based medicine with larger sample. Therefore, we designed a randomized controlled clinical trial study, aiming to verify the clinical efficacy of the ASC abutments by comparing screw-retained (with ASC abutments) single implant crowns with cemented ones in esthetic region.
Interventions
PROCEDUREImmediate implant placement
Implants are placed in fresh socket
PROCEDUREAngulated screw-retained crowns placement
To insert the restorations by angulated screw systems
PROCEDURECemented crowns placement
To cement the restorations onto the implant abutment
Sponsors
Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
1. ≥18 years old and in good health; 2. Single tooth implant (type 1) in the esthetic region; 3. Patients with natural teeth adjacent to single implant crowns; 4. Patients with periodontal treatment before implant surgery; 5. The implants are from Nobel Biocare system with tapered link and the permanent restoration is a single crown and all-ceramic; 6. Soft tissue in the implanting-and-adjacent areas is healthy and free of infection
Exclusion criteria
1. Multiple implants in the esthetic region, or the restoration is a bridge 2. Patients with bone augmentation procedures; 3. Heavy smokers (\>10 cigarettes/day); 4. Medically compromised patients (American Society of Anesthesiologists (ASA) classification III-IV); 5. Implants in an incorrect three-dimensional position (definition according to ITI VOL1); 6. Uncontrolled diabetes mellitus; 7. Unwilling to participate in the present study.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| BOP% | from baseline to 1-year follow-up | Percentage of bleeding on probing positive |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| PPD | from baseline to 1-year follow-up | Pocket probing depth |
| MBL | from baseline to 1-year follow-up | Marginal bone loss |
| PES | from baseline to 1-year follow-up | pink esthetic score |
Countries
China
Outcome results
None listed