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Correlation of Implant Location to Marginal Bone Level Changes in Single-Unit Restorations: A Retrospective Study
Berceste Guler Ayyildiz1,2, Halil Ayyildiz2,3, Tolga Fikret Tözüm2
1Department of Periodontology, Faculty of Dentistry, Kütahya Health Sciences University, Kütahya, Türkiye.
Clinical Implant Dentistry and Related Research
|September 30, 2025
Summary
Dental implant placement location and prosthetic delivery time significantly impact marginal bone loss. Anterior implants and longer prosthetic delivery times increase bone loss risk, highlighting the importance of emergence angle and profile considerations.
Area of Science:
- Dental Implantology
- Prosthodontics
- Oral Surgery
Background:
- Understanding emergence angle (EA) and emergence profile (EP) is crucial for single-unit fixed prosthetic restorations at the bone level.
- Radiographic marginal bone loss (MBL) is a key indicator of implant health and longevity.
- The influence of implant location and prosthetic delivery timing on MBL requires further investigation.
Purpose of the Study:
- To determine emergence angle (EA) and emergence profile (EP) values for single-unit fixed prosthetic restorations at bone level.
- To evaluate the effect of different implant locations (molar, premolar, anterior) on radiographic marginal bone loss (MBL).
- To assess the correlation between prosthetic delivery time and MBL.
Main Methods:
- Analysis of 500 single-unit dental implants in 226 patients across molar, premolar, and anterior locations.
- Radiographic assessment of EA, EP, and marginal bone level changes (ΔMBL).
- Statistical analysis including Receiver Operating Characteristic (ROC) curve and binary logistic regression to identify risk factors for MBL.
Main Results:
- Mesial EA cut-off values were determined: 36.42° (molar), 29.70° (premolar), and 25.12° (anterior).
- Increased prosthetic delivery time by one month elevated MBL risk by 7.2% (OR: 1.072).
- Premolar implants showed 2.381 times higher MBL risk than molar implants, while anterior implants showed 3.655 times higher risk.
Conclusions:
- Marginal bone loss (ΔMBL) can be effectively evaluated using emergence angle (EA) values.
- A longer duration between surgical placement and functional loading increases the risk of marginal bone loss.
- Implant location significantly influences the risk of marginal bone loss, with anterior sites posing the highest risk.
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