Preparation of abutment teeth with a specialized clinical parallelometer.

PURPOSE: A compulsory requirement for the treatment of defects in the dentition is to establish parallelism in the abutment constructions. MATERIALS AND METHODOLOGY: We propose a simplified effective parallelometer that is fixed to the handle of a metal impression tray for both of the jaws. It ensures the same direction of the preparation instruments for all preparation zones. We applied the device for control in clinical practice for preparation of parallel surfaces and profiles. The working models were subjected to comparative analysis with a laboratory parallelometer. DISCUSSION: The results obtained confirm the achieved parallelism between homonymous dental walls. There isn't an index for statistical analysis. CONCLUSIONS: The results achieved allow us to recommend the device for practical application. By using the clinical parallelometer the mistakes in the preparation of bridge abutments will be reduced to a minimum.

A device for determination of a plane ensuring parallel preparation.

PURPOSE: Parallel preparation of a greater number of teeth with a different tilt is a difficult clinical task. For precise guidance of the preparation instruments with a fixed individual tilt it is necessary to determine the "working preparation plane". A device for orientation and fixation of an individual direction for parallel preparation is created. METHODOLOGY: We have prepared 47 bridge abutments using our methodology. The working models are subjected to control and comparative analysis with a precise laboratory parallelometer. The reported results do not show differences requiring statistical analysis. DISCUSSION: The device serves to determine the working preparation plane. It promotes the fixing of an intraoral parallelometer that controls the achieved parallelism between the homonymous surfaces of dental stumps.