Rotational Tendencies and Their Influence on Surveying and Designing of Removable Partial Denture: Theoretical Considerations with Literature Review

Background Aims: Rotational tendency is an important factor that determines the way in which all kinds of removable partial dentures (RPDs) behave during function. However, a literature review revealed lack of comprehensive quantitative presentation about the problem. The purpose of this article was to investigate this assumption and explain the importance of rotational tendency using diagrammatic as well as mathematical evidence. Materials and Methods: The presented diagrams and mathematical equations were used to explore different aspects related to the function of RPDs such as the way in which the guiding planes behave and interact with the tilt of the cast (decided path of insertion) to govern their retentive and stress breaking potential as well as other aspects related to RPD service. New evidence that supports considering zero tilt during RPD designing is also presented in the contest of this article. Results and Conclusions: Rotational tendency is an important factor that influences the way in which RPDs function. The study approached the topic in a quantitative way and prescribed simple mathematical formulas that can be used in assessing different treatment plans. Accounting for this during RPD, surveying and designing steps should contribute to the quality improvement of this still applicable dental service. In addition, the quantitative approach carries the potential of increasing the predictability of the outcome when different factors related to RPD designing are manipulated. Clinical Implications: It is extremely important to consider the interactions that take place between the inclination of the desired path of insertion and the retention, stabilizing and stress breaking potential of the different RPD components.