Ridge Augmentation with Autogenous Bone Graft and Expanded Polytetrafluoroethylene Membrane using Tenting Screw: A...

The study aims to compare non-tenting screw and tenting with a reinforced expanded polytetrafluoroethylene (ePTFE) membrane in horizontal ridge augmentation using an autogenous bone graft.

A randomized controlled clinical trial was conducted between 150 patients needing dental implants. The participants were randomly divided into three study groups; group 1: ridge augmentation using non-resorbable ePTFE membrane only, group2: ridge augmentation using an ePTFE and tenting screw with bone graft Bio-Oss mixed with autogenous bone particles and group 3 (control): ridge augmentation with a bone block. The initial measurement was done at the bone crest at the exact implant site and 10 mm apical to the bone crest. Repeat measurements were recorded after 6 months of healing. Statistical analysis was performed by paired sample t-test and two-way analysis of variance (ANOVA). Statistical significance was considered at p <0.05.

There was a significant gain in the bone in all the three groups postsurgery. Group 3 recorded higher reading at the crest and apical sites when compared to groups 1 and 2 at 6 months (late measurements). The difference in the percentage gain was statistically significant after adjusting for age as well as the initial measurement. The highest gain was seen in group 3 followed by groups 2 and 1.

The membrane with tenting screw group and block bone groups had a significantly higher increase in measurement when compared to the membrane only group. Tenting screw with Bio-Oss can be used in patients with autogenous bone at the donor site.

Tenting screws in combination with membranes can be used to overcome the limitations posed by the use of membranes alone. It is also a useful method for a patient not consenting for block graft for any medical reason.