Considering an increasing number of HIV positive and hepatitis patients, it will be required to disinfect impressions of all patients with chemical solution in the future. Therefore silicon impression material will be indispensable in dental practice. However silicon impression incorporates air bubbles more readily than agar material, so that impression taking is considered to be more difficult. The jet injection technique enables an operator, including beginners and inexperienced, to perform precise impression taking of multiple teeth by himself or herself.

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Gothic arch has been modified in various ways and used widely in clinical practice as a method of bite registration and for adjusting condylar paths of an articulator using the check bite since it was deviced by Gysi as a method of recording mandibular movement. Many studies have pointed out that recording paths and tapping points are affected by the way in which a recording device is mounted, positional relationship between recording tables and styli, changes in occlusal dimension, etc. In regard to recording paths and jaw function, it is possible to diagnose condylar displacement by evaluating the arch form and the degree of convergence of tapping points in relation to the apex. The author conducted Gothic arch tracing in 24 edentulous patients before treatment to find that many of them showed a typical tracings with clicking recorded during restuctive movement. Therefore, it seems necessary to use Gothic arch not only as a means of establishing a mandibular position but for the assesment of mandibular function and the examination and diagnosis fo temporomandibular joint status.

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Several clinical examples of commonly-observed normal and abnomal patterns traced on the recording tables of a Denar pantograph will be discussed under the following classification:
1. Anterior horizontal recording table
2. Posterior horizontal recording table
3. Posterior vertical recording table
4. Abnormally observed on the recording tables as a whole
The author's trial to three-dimensionally record tapping points whithin border movement paths using a pantograph will also be introduced as a special method of recording. Various abnormal patterns other than the ones described here may be observed clinically. Pantographic findings offer just one possibility, which shoud be combined with clinical symptoms and other test results for rational judgement.

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