Two-stage ridge-split at narrow alveolar mandibular bone ridges

Publication date: Available online 24 May 2017
Source:Journal of Oral and Maxillofacial Surgery
Author(s): Ivo Agabiti, Daniele Botticelli
PurposeWhen the bone ridge is corticalized, the displacement of the buccal plate may result in an unintentional malfracture. The aim of the present study was to report the results on a two-stage atrophic alveolar ridge expansion performed with a sonic-air surgical instrument.Materials and methodsIn the present retrospective cohort study, the atrophic distal segments of the mandible were treated using a split-thickness flaps approach and applying an alveolar ridge expansion performed in two surgical phases. A sonic-air surgical instrument was used. In the first surgery, only basal corticotomies on the buccal plate were performed. In the second stage, sagittal and vertical osteotomies were added, aiming to facilitate the displacement of the buccal bone plate. Subsequently, implants were installed into the created space between the buccal and the lingual plates. No bone substitutes were used. The width of the displaced buccal bone wall and the gaps that occurred mesially and distally to the implant were measured at the time of implant installation. Cone beam computed tomography scans (CBCTs) were taken before the first and after the second surgeries, and the width of the alveolar crest at both observations and the width of the residual mesial and distal gaps after implant installation were measured.ResultsTen patients (6 females and 4 males; age 37 to 69 years) were included in the study and 15 implants were installed in expanded narrow ridges. Clinically, the mean width of the buccal bone wall was 1.2 ± 0.2 mm and the gaps ranged between 2.8 and 3.2 mm. At the radiographic assessments, the mean initial width of the alveolar bone crest was measured as 4.1 ± 0.5 mm, reaching 6.8 ± 0.9 mm after ridge expansion (P< 0.01).ConclusionsThe use of a modified edentulous ridge expansion (ERE) in two stages allowed the installation of implants in narrow and corticalized alveolar ridges. We suggest that the present technique is especially applicable in the distal segments of the mandible because of the low invasiveness, low risk of buccal plate fractures, reduced morbidity, and reduced costs.



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