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Use of an ultrahigh-speed laser scanner for constructing three-dimensional shapes of dentition and occlusion

JOURNAL OF PROSTHETIC DENTISTRY 2000年第3期84卷 345-352页

作者： Sohmura, T Kojima, T Wakabayashi, K Takahashi, J Osaka Univ Fac Dent Dept Dent Mat Sci & Technol Suita Osaka 5650871 Japan Osaka Univ Fac Dent Dept Fixed Prosthodont & Occlus Suita Osaka 5650871 Japan

Statement of problem. Acquisition of the 3-dimensional shape of dental casts is useful for quantitative evaluation of the diagnosis and treatment of occlusion. Purpose. This study demonstrated the acquisition of data through the use of an ultrahigh-speed laser scanner and an originally developed goniometer, the use of these tools to measure the entire 3-dimensional shape of the dental cast from multiple directions, and the connection of the data measurements to reconstruct the cast's occlusion with the use of a computer. Material and methods. A commercially available apparatus that emits a line laser and completes 1 scan in only 0.6 seconds was used. To compensate for the unmeasured region, the cast was measured from 4 directions on the original goniometer, and the connection of data to obtain the entire image was carried out. Further, the reconstruction of the occlusion between the upper and lower casts was attempted by transferring the upper cast data to the lower cast. Results. By the data connection, the entire shape of the upper and lower casts was constructed, and the characteristic structure was reproduced. The data connections were satisfactory for the flat surfaces but less accurate for the inclined surfaces. Reconstruction of the occlusion between the upper and lower casts was accomplished. It was then possible to visualize the occlusion from arbitrary directions and sections with computer graphics. Conclusion. The construction of the entire 3-dimensional shape of a dental cast and the reconstruction of the occlusion were accomplished using an ultrahigh-speed measurement system and original goniometer. These results will be useful for clinical applications such as computerized diagnoses and treatment of occlusion, and for the replacement of the stent casts in the dental office by computerized data.

关键词：校准测颅法/仪器和设备计算机制图牙模型牙|牙合| 成像三维/仪器和设备激光可重复性结果人类

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Digital imaging in the assessment of facial deformity

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BRITISH JOURNAL OF ORAL & MAXILLOFACIAL SURGERY 1999年第2期37卷 94-98页

作者： Fanibunda, KB Thomas, PR Newcastle Univ Sch Dent Dept Oral & Maxillofacial Surg Newcastle Upon Tyne NE2 4BW Tyne & Wear England Newcastle Univ Dept Geomat Newcastle Upon Tyne NE2 4BW Tyne & Wear England

A combination of digital imaging and conventional radiographic techniques has been used to obtain a life-size composite image of the facial soft tissue profile, the skull, and the teeth, anatomically superimposed on each other. The system overcomes major problems associated with assessment of facial deformity such as magnification, the exposure of photographs and radiographs from different positions, radiographs with overexposed soft tissue profiles, lengthy procedures in photographic studios, and, in addition, enables a degree of partial automation in the management of patients.

关键词：模拟数字转换测颅法/仪器和设备测颅法/方法面部/解剖学和组织学图像处理计算机辅助/方法颌面畸形/放射摄影术摄影术/仪器和设备 X线影像增强放射摄影术牙科/方法放射摄影术牙科数字人类

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OBSERVER ERROR IN ULTRASONIC FETAL CEPHALOMETRY

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ACTA OBSTETRICIA ET GYNECOLOGICA SCANDINAVICA 1975年第1期54卷 41-44页

作者： BERGSJO, P BAKKE, T SALAMONSEN, L UNIV BERGEN SCH MEDDEPT OBSTET & GYNECOLBERGENNORWAY

Although ultrasonic fetal cephalometry gives quite accurate results, a certain degree of observer error must be expected. In a series of duplicate measurements, the magnitude of this error has been assessed. The observer error was lowest when the fetal head was partly engaged in the pelvic inlet, when the midline echo was clearly observed, and when an obstetrician with experience in ultrasonography performed the examinations. The observer error should be take into account when growth indices are evaluated in the individual patient.

关键词：测颅法/仪器和设备误诊示波测量法/仪器和设备产前诊断/方法超声检查女(雌)性人类妊娠

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New possibilities of temporomandibular joint registration during orthodontic operations

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Mund-, Kiefer- und Gesichtschirurgie : MKG 1999年第2期3卷 67-72页

作者： Marmulla, R. Klinik und Poliklinik für Mund- Kiefer- und Gesichtschirurgie Universität Regensburg. Germany

Repositioning osteotomies in a Le Fort I fashion can affect the position of the TMJ, which cannot be viewed directly during surgery. Using the computer-assisted navigation system SSN (Surgical Segment Navigator), the intraoperative position of the TMJ can be checked and unintentional malpositions can be detected. Positioning of the maxilla after Le Fort I osteotomy was carried out in a conventional fashion. Afterwards, the position of the maxilla was corrected in the same patients using the SSN. In this way, the precision of conventional and SSN-guided positioning of the maxilla and its effect on the TMJ has been compared.

关键词：测颅法/仪器和设备计算机制图计算机系统图像处理计算机辅助/仪器和设备手术中并发症/外科学上颌骨/外科学截骨术勒福/仪器和设备颞下颌关节/外科学人类

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Initial experiences with digital 3-dimensional stereophotogrammetry imaging

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Mund-, Kiefer- und Gesichtschirurgie : MKG 2000年第3期4卷 183-186页

作者： Surwald, C. Ward-Booth, P. Department of Oral and Maxillofacial Surgery Queen Victoria Hospital East Grinstead West Sussex United Kingdom

A digitised three-dimensional (3-D) image of the face has many valuable uses. These include accurate measurements of facial morphology, clinical documentation and objective analyses of surgical procedures. A new system presented here, based on stereophotogrammetric techniques, instantaneously captures digitised images using high-resolution cameras. It has an accuracy of more than 0.5 mm RMS and creates the 3-D image from approximately 20,000 points. The principles of the image capturing are demonstrated and the potential uses discussed. Surgical changes of the soft tissue in two patients following orthognathic surgery are also illustrated. This new capturing and measurement system provides a simple method of determining 3-D changes in soft tissue following surgery and is a useful tool for clinical purposes.

关键词：测颅法/仪器和设备腭裂/诊断腭裂/外科学图像处理计算机辅助/仪器和设备截骨术摄影测量法/仪器和设备手术后并发症/诊断凸颌/诊断凸颌/外科学治疗结果成年人女(雌)性人类男(雄)性

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