Horizontal Versus Vertical Ridge Augmentation For Implant Therapy: A Comparative Study

Abstract

Background:

Alveolar ridge deficiencies frequently compromise ideal dental implant placement and often necessitate ridge augmentation procedures. Horizontal and vertical ridge augmentation techniques are commonly employed to reconstruct deficient alveolar bone; however, their clinical predictability, complication rates, and implant-related outcomes differ.

Aim:

The present retrospective comparative study aimed to evaluate and compare the clinical and radiographic outcomes of horizontal and vertical alveolar ridge augmentation procedures performed prior to dental implant placement, with particular emphasis on bone gain, implant survival and success rates, complication rates, and healing duration.

Materials and Methods:

A retrospective analysis was conducted on patients who underwent alveolar ridge augmentation followed by implant placement between October 2009 and June 2025. Patients were categorized into two groups: Group I (horizontal ridge augmentation) and Group II (vertical ridge augmentation). Clinical records and radiographic data, including cone-beam computed tomography (CBCT) where available, were reviewed. Primary outcomes included horizontal and vertical bone gain (mm), while secondary outcomes comprised implant survival rate, implant success rate, postoperative complications, and healing duration. Statistical analysis was performed using SPSS version 25.0. Intergroup comparisons were carried out using the Independent Student’s t-test for continuous variables, with statistical significance set at p < 0.05.

Results:

Vertical ridge augmentation demonstrated significantly greater mean bone gain (5.8 ± 1.4 mm) compared with horizontal ridge augmentation (4.2 ± 1.1 mm) (p = 0.010). However, horizontal ridge augmentation showed significantly higher implant survival rates (97.8 ± 1.8%) than vertical ridge augmentation (95.2 ± 2.9%) (p = 0.029), as well as superior implant success rates (95.6 ± 2.4% vs. 92.1 ± 3.7%; p = 0.021). The complication rate was significantly higher in the vertical ridge augmentation group (24.8 ± 8.6%) compared with the horizontal ridge augmentation group (11.4 ± 5.2%) (p < 0.001). Additionally, the healing duration was significantly longer following vertical ridge augmentation (8.3 ± 1.8 months) than horizontal ridge augmentation (5.4 ± 1.2 months) (p < 0.001).

Conclusion:

Vertical ridge augmentation procedures are effective in achieving greater bone gain and are particularly indicated for severe vertical deficiencies; however, they are associated with higher complication rates, longer healing periods, and comparatively lower implant survival and success rates. Horizontal ridge augmentation offers greater predictability, fewer complications, shorter healing duration, and more favorable implant-related outcomes. Appropriate case selection and individualized treatment planning are essential for optimizing clinical success in ridge augmentation prior to implant placement..