engleski

Bone dimensions in the posterior mandible – A retrospective radiographic study using Cone Beam Computed Tomography. Analysis of the dentate sites

Background and purpose: The purpose of this retrospective radiographic study was to analyze the dimensions of the alveolar bone in the posterior dentate mandible based on cone beam computed tomography (CBCT) images. Methods: A total of 56 CBCTs met the inclusion criteria, resulting in a sample size of 122 cross-sections showing posterior mandibular teeth (premolars and molars). The thickness of the facial and lingual bone walls was measured at two locations at the examined teeth: 4 mm apical to the CEJ (measurement point 1, MP1) and at the middle of the root (measurement point 2, MP2). Further, alveolar bone width was assessed at the level of the most coronal facial bone detectable (alveolar bone width 1, BW1) and at the superior border of the mandibular canal (alveolar bone width 2, BW2). The vertical distance between the two (height, H) as well as the presence of a lingual undercut was additionally analyzed. Results: There was a steady increase in facial bone wall thickness from the first premolar to the second molar at both MP1 and MP2. The alveolar bone width (BW1) at premolars was significantly thinner than that at molars. Alveolar bone height was relatively constant for all the examined teeth. Presence of a lingual undercut was observed in 38.93% of the examined teeth. Interpretations: For the selection of an appropriate post extraction treatment approach, i.e. immediate or early implant placement, the analysis of the alveolar bone dimensions at the tooth to be extracted by means of CBCT can offer valuable information concerning bone volume and morphology at the future implant site.

Key words: dental implants; implant placement post extraction; posterior mandible; alveolar bone dimensions; cone beam computed tomography

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