Screw retained maxillary anterior crowns on implants

Completed

• Conditions: Partial loss of teeth,; maxillary anterior edentulism

• Registration Number: CTRI/2021/12/038506
• Lead Sponsor: Dynamic Abutment Solutions

Brief Summary

The present study was conducted in the Department of Prosthodontics and Crown & Bridge, Subharti Dental College and Hospital, Meerut is to evaluate biological, mechanical and patient reported parameters associated with Angulated Screw Channel abutments and Multi unit abutments for fabrication of screw retained implant crowns in anterior esthetic zone. For the study 20 patients were selected who needed implants in maxillary anterior region. The implants were placed either crestal or subcrestal position to accommodate the angulated abutments (Angulated Screw Channel and Multi unit abutments) in a way that it lie within the prosthetic envelop. Depending on the group assigned, a screw retained crown was made either on ASC abutment or MU abutment. All the parameters were evaluated at the time of crown placement and 12 months after crown placement. The data then was statistically evaluated and compared.In the present study, implant survival was found 100% in both groups. MBL decreased significantly from baseline to 1-year follow-up in both groups. MBL in the MU group was slightly lower than in the ASC group but this difference was not statistically significant. Also, no statistically significant difference was found in the modified plaque index, modified sulcus index, and gingival index at baseline and 1-year follow-up values in both groups.

The RTL value was significantly lower (p<0.003) in the ASC group than MU group at baseline, however, no statistically significant difference in RTL and screw loosening was found at 1-year follow-up between both the groups. There was no statistically significant difference in patient-reported parameters. Limitations of this study were the small sample size and short-term follow-up period. The high cost and limited documented clinical success rate of these abutments as single-unit implant restoration have restricted their application in day-to-day practice. Thus, prospective studies with long-term follow-ups and larger sample sizes are required to understand the possible biological, mechanical and patient-reported parameters, and draw concrete decisions about the superiority of either of the abutments.Within the limitations of this study, it can be stated that the ASC and MU abutments with anti-rotation feature can be used as an effective alternative for screw retained restorations in cases of non-axially loaded implant with excellent clinical performance after 1 year of function.

Detailed Description

Not available

Study Timeline

• Study Start: 2021-12-15
• Study Completion: 2023-01-30
• Last Update Posted: 2023-03-15

Recruitment & Eligibility

• Status: Completed
• Sex: All
• Target Recruitment: 20

Inclusion Criteria

1)Patient willing for the procedure (the study is explained, including the procedure and follow up for evaluation) 2)Patient that has good oral hygiene and periodontal health (patients that can follow up for evaluation) 3)Sufficient mesio-distal, bucco-lingual, and interocclusal space for placement of an anatomic restoration 4)Implant site free from infection.

Exclusion Criteria

• 1.Medical and general contraindications for the surgical procedures 2.Presence of active and uncontrolled periodontal disease 3.History of local radiotherapy to the head and neck region.
• 4.Systemic diseases (Uncontrolled diabetes, recent MI, valvular prosthesis surgery, bleeding disorders, acute renal failure, immunosuppression).
• 5.Patients in intravenous bisphosphonate.
• 6.Psychiatric illness 7.Chronic heavy smokers 8.History of head and neck irradiation in the last 6 months.

Study & Design

• Study Type: Interventional
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Angulated screw channel abutment and multi unit abutment can alter angulation of screw hole and used in anterior screw retained prosthesis.	at baseline prosthesis delivery | 6 months | 1 year

Secondary Outcome Measures

Name	Time	Method
biological, mechanical and patient reported parameters	at baseline

Trial Locations

Locations (1)

Subharti Dental College; 🇮🇳 Meerut, UTTAR PRADESH, India

Subharti Dental College

🇮🇳Meerut, UTTAR PRADESH, India

Niyati Varshney

Principal investigator

7895306191

niyati_manu1994@yahoo.co.in