Biomedical subjects

Andrew Rosen

Publications and source records attributed to Andrew Rosen.

2 recordsLinked to original sources

PubMed2003

The precision of computer-generated surgical splints.

PURPOSE: The purpose of this study was to assess the precision of stereolithographic surgical splints generated by the authors' computer-aided design and manufacturing (CAD/CAM) technique by comparing them with the conventional acrylic splints. MATERIALS AND METHODS: Seven volunteers were used. A pair of surgical splints, stereolithographic and conventional acrylic splints, was fabricated for each subject. A novel method was developed to quantify the airspace between the teeth and the splint. Conventional acrylic surgical splints served as a control group. The airspaces were recorded by impression materials and sliced cross-sectionally. Corresponding areas of the cross-sectional airspaces between stereolithographic and acrylic splints were measured and compared. Pearson's correlation coefficient and linear regression tests were performed. RESULTS: Seven pairs of surgical splints were created. The areas of 98 pairs of cross-sectional airspaces were measured. The average difference between the conventional and the STL splints was 0.24 +/- 0.23 mm(2). The correlation coefficient (r) of the airspace areas between the stereolithographic and conventional acrylic splints was 1.00, and the regression coefficient (beta) was 1.03 (P <.01). CONCLUSIONS: The results indicated that the stereolithographic splints, generated by the authors' CAD/CAM technique, had a high degree of accuracy. The fit of the STL splints was the same as the conventional surgical splints. In the future, traditional plaster dental model surgery will be replaced by computer-assisted surgical planning. The surgical splints will be made in the computer and the treatment plan will be directly transferred to the patient.

Acrylic Resins↗

PubMed2003

A new technique for the creation of a computerized composite skull model.

PURPOSE: The goals of this study were to develop a technique for creating a computerized composite skull model and to test its accuracy. The computerized composite skull model is the combination of a 3-dimensional (3D) computed tomography (CT) bone model with digital dental models. MATERIALS AND METHODS: A dry skull with intact dentition was used in development of the technique. The creation of the computerized composite skull model was divided into 3 steps. The first step was to create digital dental models. The second step was to create a 3D CT bone model of the craniomaxillofacial skeleton. The last step was to incorporate the digital dental models into the 3D CT skull model, creating a computerized composite skull model. The accuracy of the computerized composite skull model was assessed. Bone-to-bone, tooth-to-tooth, and bone-to-tooth measurements were made on the computerized composite skull model and the dry skull. Pearson correlation coefficient and linear regression tests were performed. RESULTS: A technique to create a computerized composite skull model was developed. This computerized model not only represented bony structures from CT data but also reproduced dentition from digital dental models. For the bone-to-bone measurements, the mean difference between the computerized composite skull model and the dry skull was 0.5 +/- 0.6 mm. For the tooth-to-tooth measurements, the mean difference was 0.1 +/- 0.2 mm. For the bone-to-tooth measurements, the mean difference was 0.2 +/- 0.3 mm. CONCLUSIONS: This study showed the feasibility of creating a computerized composite skull model as well as its accuracy.

Cephalometry↗