Comparative Study of Occlusal Contact Marking Indicators.

BACKGROUND: A variety of indicators to register occlusal contacts are used in the daily dental practice. One of the most frequently used qualitative occlusal indicators is the articulating paper. Its reliability is often disputed because this indicator could produce false positive results or fail to register any occlusal contacts. AIM: To compare the number and size of the recorded contacts on a tooth surface obtained with articulating paper and foil. MATERIALS AND METHODS: Typodonts of upper and lower jaw with intact dental arches Frasaco A-3Z were fixed in a Girbach arcon articulator. Articulating contacts were marked with 12-micron Bausch articulating foil and 200-micron Bausch articulating paper under the same load. For each study a new sheet of the occlusal indicators was used, and 10 repetitions were made for each one. After every marking, the lower jaw was dismounted from the articulator and the distribution of the markings was videographed using a camera. The number of occlusal contacts was entered in a table. We analysed the markings on the first maxillary and first mandibular molars. RESULTS: We found that fewer and bigger contacts were recorded using the 200-micron articulating paper in comparison with the contacts obtained using the foil. CONCLUSIONS: The type of occlusal contact indicator has an effect on the number and the size of the occlusal contact markings.

The T-SCAN System in Evaluating Occlusal Contacts.

BACKGROUND: Normal occlusal and articulation relations between the jaws ensure equal distribution of occlusal forces during mastication. A T-SCAN system allows these relations to be measured dynamically during the articulation cycle. AIM: To evaluate the T-SCAN III system in measuring and assessing the forces of occlusal contacts and their digital presentation. PATIENTS AND METHODS: Thirty students aged 19 - 22 years were examined. Of these only one matched the study criteria: - intact dentition; - without or with class I fillings in teeth 36 or 46; - Angle's class I jaw relation We used a computerized occlusal analysis system T-SCAN in the study. It comes with a registering sensor for the occlusal contacts, a module for transmitting the signals to a computer, and conversion software to generate images on a computer screen. RESULTS: We evaluated the system's capabilities in registering the occlusal contacts during mastication on an occlusion film and the occlusal forces using a digital display. CONCLUSION: The T-SCAN system provides the only accurate way to determine and evaluate the time sequence and force of occlusal contacts by converting the qualitative data into quantitative and displaying them digitally.