Study compares compound bridges and single crown restorations
Compound bridges (CBs) use implants and natural teeth as supports for fixed restorations. This technique is cost-effective as it uses fewer implants, however it requires very specific inclusion criteria regarding tooth vitality and periodontal health. Researchers from Ulm University in Germany conducted a randomised controlled trial (RCT) to evaluate the difference between aesthetic outcomes in single crowns (SCs) placed on two implants and compound bridges.
The RCT evaluated any technical and biological complications of implant-supported CBs and two SCs over a period of five years. Forty patients were involved in the study. Implants were inserted according to standard procedure using drill guides. Standard titanium abutments were used and either zirconia or non-precious alloy materials were used as frameworks. Follow-up examinations took place at 6, 12, 24, 36 and 60 months. Patients were asked at follow-ups to rate their satisfaction with the aesthetic outcome.
All implants were inserted and restorations seated. There were two instances of minor repairable chipping, and two SCs had to be remade due to major chipping. No significant difference was observed between the zirconia and non-precious alloy frameworks. Overall both CBs and SCs achieved very good aesthetic results. There was no significant difference between CB and SC with regard to patients’ aesthetic satisfaction.
This study was presented as an e-poster at the 2017 EAO Congress.