Loading protocols for single-implant crowns: a systematic review and meta-analysis.

Area of Science:

• Dental Implantology
• Prosthodontics
• Biomaterials

Background:

• The timing of dental implant crown loading is a critical factor influencing treatment outcomes.
• Understanding the differences between immediate, early, and conventional loading protocols is essential for clinical decision-making.

Purpose of the Study:

• To compare immediate loading of single-implant crowns with early and conventional loading protocols.
• To evaluate outcomes including implant survival, marginal bone loss, soft tissue stability, esthetics, and patient satisfaction.

Main Methods:

• A systematic literature search of Medline and Embase databases was conducted, supplemented by manual searches.
• Included were randomized controlled trials (RCTs) with a minimum 1-year follow-up comparing different loading protocols for single-implant crowns.
• Meta-analysis was performed to determine odds ratios (OR) and standardized mean differences (SMD) with 95% confidence intervals (CI).

Main Results:

• No significant differences in implant survival or marginal bone loss were found between immediate and conventional loading at 1, 2, 3, and 5 years.
• Papilla height changes were similar between immediate and conventional loading groups.
• Soft tissue outcomes showed mixed results, with one study indicating more recession with immediate loading, while others found no difference.

Conclusions:

• Immediate and conventional loading of single-implant crowns demonstrate comparable success in terms of implant survival and marginal bone loss.
• These findings are most applicable to implants with high initial stability (implant stability quotient ≥ 60-65 or torque ≥ 20-45 Ncm) and without bone augmentation.
• Esthetic outcomes and patient satisfaction data are currently inconclusive due to limited and heterogeneous studies.