Randomized controlled trial of immediate alveolar ridge preservation for bone and soft tissue aesthetics after tooth extraction

By
Yi-Ye Zhou
Nan Li
Yan Gao
Hui Chen
March 12, 2026
0 min

Frontiers In Surgery

Overview

This prospective randomized trial demonstrated that immediate alveolar ridge preservation (ARP) using β-TCP and a collagen membrane significantly reduces alveolar bone resorption and improves soft tissue morphology and aesthetics compared to conventional tooth extraction. The study highlights a strong correlation between preserved bone volume and superior soft tissue aesthetic outcomes over a 12-month period.

Background

Tooth extraction leads to alveolar bone resorption and soft tissue changes that complicate implant rehabilitation and aesthetic restoration. Conventional extraction often results in significant bone height and width loss, especially in the anterior region, causing gingival recession and contour deformities. Alveolar ridge preservation (ARP) techniques aim to mitigate these changes by grafting biomaterials and using barrier membranes to maintain bone volume and support soft tissue integrity. Prior studies focused mainly on radiographic bone volume, with limited evaluation of soft tissue aesthetics and morphology.

Data Highlights

Parameter	Control Group (Conventional Extraction)	ARP Group (Immediate Grafting)	P Value
Bone Height Resorption (mm)	1.3	0.7	<0.001
Bone Width Resorption (mm)	1.7	1.1	<0.001
Soft Tissue Contour	33.3% margin disruption, 60.0% moderate irregularities	50.0% smooth, 50.0% mild abnormalities	<0.001
Soft Tissue Color Score (10-point scale)	6.1 ± 0.6	7.8 ± 0.5	<0.001
Soft Tissue Morphology Score (10-point scale)	5.9 ± 0.7	7.7 ± 0.6	<0.001

Key Findings

Immediate ARP significantly reduced alveolar bone height and width resorption at 12 months compared to conventional extraction (0.7 mm vs. 1.3 mm height; 1.1 mm vs. 1.7 mm width; P < 0.001).
Soft tissue contours were better preserved in the ARP group, with 50% showing smooth morphology versus predominant margin disruption and irregularities in controls (P < 0.001).
Soft tissue color and morphological aesthetic scores were significantly higher in the ARP group (7.8 and 7.7) than in controls (6.1 and 5.9; P < 0.001).
A strong negative correlation existed between bone resorption and aesthetic scores, indicating that better bone preservation supports superior soft tissue aesthetics (P < 0.001).
ARP provides a more stable three-dimensional bone structure that maintains soft tissue vascularization and anchorage, delaying gingival recession.

Clinical Implications

Immediate alveolar ridge preservation using β-TCP and collagen membranes should be considered following tooth extraction to minimize bone loss and optimize soft tissue aesthetics, particularly in the anterior aesthetic zone. This approach facilitates improved outcomes for future implant placement by maintaining both hard and soft tissue architecture. Clinicians should integrate ARP into individualized treatment planning to enhance long-term functional and aesthetic results.

Conclusion

Immediate ARP significantly mitigates alveolar bone resorption and preserves soft tissue morphology and aesthetics compared to conventional extraction. These findings support ARP as a valuable clinical procedure to improve implant site preparation and aesthetic outcomes.

References

Prospective Randomized Trial Assessing Immediate Alveolar Ridge Preservation for Aesthetic Outcomes in Bone and Soft Tissue Following Tooth Extraction