[Influence of surface conditions on the results of Periotest value. An in vitro and in vivo study]. / Der Einfluss äusserer Randbedingungen auf das Ergebnis der Periotest-Messung. Eine in vitro- und in vivo-Untersuchung.

In several experiments it was examined, whether slight deviations from the using reglementation for the PERIOTEST-device alter the measurement results. Tilting of the handpiece against ground or variation of the distance between handpiece and the surface of the tooth within the suggested intervals did not alter the PERIOTEST-value. If the measurement was done more incisal then specified, the PERIOTEST-value increased, if the measurement was done more cervical, the value decreased. Tilting the handpiece against the tooth surface within +/- 8 degrees in horizontal and +/- 6 degrees in vertical direction gave only little effect on the PERIOTEST-value on clinical firm upper front teeth.

[Suitability of various materials for indexing needle point registrations]. / Die Eignung verschiedener Materialien für die Verschlüsselung der Stützstiftregistrierung.

Acrylic, plaster and polyether were evaluated for their accuracy in indexing needle point registration. Additionally, a new experimental system was tested, that permits the dentist do immediately verify the accuracy of the recording. Best results were obtained when the indexes were not removed from the occlusal plane plates. When the indexes were dislodged, acrylic and plaster demonstrated the most accurate results in repositioning the occlusal plane plates. The experimental system demonstrated comparable accuracy to both, acrylic and plaster.

[The result of the needle point tracing in dependence of the clenching force and changed needle position in the transverse direction]. / Das Ergebnis der Stützstiftregistrierung in Abhängigkeit von Kraft und veränderter Stiftposition in der Transversalen.

The effect of the positioning of the needle in the horizontal plane and the applied clenching force on the result of the needle point tracing was investigated. The results show a strong influence of the applied clenching force. The results on the variation of the needle position leaded to the conclusion, that in the progress of the needle point tracing the lower jaw is balanced over the central bearing point.

[Methods and materials for the construction of complete dentures]. / Arbeitsweisen und Materialien bei der Herstellung totaler Prothesen.

In a survey the methods and materials used for making complete dentures were collected from 603 dentists. The impression material most frequently used for primary impressions was alginate and elastic impression material for functional impressions. Compared with an earlier survey the percentage of dentist using needle point tracing for recording jaw relations increased from 6 to 40%. Remounting complete dentures was done by 64% of the dentists whenever required; 9% applied this method as a routine.

[Effect of clenching forces on the results of needle point tracing in the sagittal plane]. / Uber den Einfluss der Kieferschlusskraft auf das Ergebnis der Stützstiftregistrierung in der Sagittalen.

It was the purpose of this study to assess the influence of the applied clenching force and the positioning of the needle in the sagittal plane on the results of needle point tracings. The results show a direct influence of the applied force, whereas the influence of the position of the needle point showed great interindividual variations.