关键词: 翼上颌区种植, 上颌后牙区, 牙槽骨萎缩, 上颌结节, 翼突

Abstract: Objective To analyze the differences of bone mass between sides of distalextended tooth missing and nondistalextended tooth missing in the maxilla and to provide the basis for pterygomaxillary implant placement as a common method for dental implant in the posterior atrophic maxilla. Methods At the Affiliated Stomatological Hospital of Nanjing Medical University from January to June of 2018, patients with one side of distalextended tooth missing to the premolar region with the bone height less than 5 mm and the other side of nondistalextended tooth missing in the maxilla (26 cases in total) were selected. Their cone beam computed tomography files were collected to compare the width, height, pterygoid process height and volume of pterygomaxillary area between sides of distalextended tooth missing and nondistalextended tooth missing. Results Aside from the height of pterygoid process, the width, height and volume of pterygomaxillary area were significantly reduced for the absence of maxillary posterior tooth (P=0.000). The width, height and volume of pterygomaxillary area were （6.11±1.05）mm and （6.81±0.99）mm, （15.16±1.39）mm and（16.73±1.44）mm, （388.84±81.26）mm3 and（465.85±91.98）mm3 respectively on the sides of distalextended tooth missing and nondistalextended tooth missing. Conclusion The bone mass of pterygomaxillary area is significantly different between sides of distalextended tooth missing and nondistalextended tooth missing. However, this area is still sufficient for long implant placement, which should be combined with short implants and/or abutment teeth in the anterior maxilla to solve the difficulties in implant restoration caused by severe atrophy of posterior maxilla

Key words: terygomaxillary implant, maxillary posterior region, atrophic alveolar bone, maxillary tuberosity, pterygoid process