Abstract
BackgroundThe goal of this study was to retrospectively evaluate the prognosis of minimal invasive horizontal ridge augmentation (MIHRA) technique using small incision and subperiosteal tunneling technique.MethodsThis study targeted 25 partially edentulous patients (10 males and 15 females, mean age 48.8 ± 19.7 years) who needed bone graft for installation of the implants due to alveolar bone deficiency. The patients took the radiographic exam, panoramic and periapical view at first visit, and had implant fixture installation surgery. All patients received immediate or delayed implant surgery with bone graft using U-shaped incision and tunneling technique. After an average of 2.8 months, the prosthesis was connected and functioned. The clinical prognosis was recorded by observation of the peri-implant tissue at every visit. A year after restoration, the crestal bone loss around the implant was measured by taking the follow-up radiographs.One patient took 3D-CT before bone graft, after bone graft, and 2 years after restoration to compare and analyze change of alveolar bone width.ResultsThis study included 25 patients and 39 implants. Thirty eight implants (97.4 %) survived. As for postoperative complications, five patients showed minor infection symptoms, like swelling and tenderness after bone graft. The other one had buccal fenestration, and secondary bone graft was done by the same technique. No complications related with bone graft were found except in these patients. The mean crestal bone loss around the implants was 0.03 mm 1 year after restoration, and this was an adequate clinical prognosis.A patient took 3D-CT after bone graft, and the width of alveolar bone increased 4.32 mm added to 4.6 mm of former alveolar bone width. Two years after bone graft, the width of alveolar bone was 8.13 mm, and this suggested that the resorption rate of bone graft material was 18.29 % during 2 years.ConclusionsThe bone graft material retained within a pouch formed using U-shaped incision and tunneling technique resulted with a few complications, and the prognosis of the implants placed above the alveolar bone was adequate.
Highlights
The goal of this study was to retrospectively evaluate the prognosis of minimal invasive horizontal ridge augmentation (MIHRA) technique using small incision and subperiosteal tunneling technique
Ridge augmentation techniques are indicated to establish stable placements of dental implant in partial or complete edentulous patients who suffer from insufficient bone volume [1]
Of the patients who had taken follow-up cone-beam computed tomography (CBCT), analytic descriptions regarding the increase in alveolar bone volume obtained at the graft sites at the time of bone graft and implant placement are shown in Table 2; mean volume of the ridge augmentation obtained and percentage of reduction after implant loading were calculated
Summary
The goal of this study was to retrospectively evaluate the prognosis of minimal invasive horizontal ridge augmentation (MIHRA) technique using small incision and subperiosteal tunneling technique. In conventional GBR, a flap approach is used via a horizontal incision along the alveolar crest, with two oblique vertical incisions and release of the periosteum. Barrier membranes such as ones made of e-PTFE are often placed upon selection of bone graft materials. Potentially excessive tissue volume results along with the procedural edema and inflammation, exerting tension on the suture line. These procedures could increase the morbidity and discomfort in the patient
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