Aim: The aim of this review is to summarize the pertinent literature concerning the most appropriate posterior reference point(s) to locate the hinge axis and to arrive at a classification system.
Background: Numerous theories are proposed on the occurrence and the need to trace hinge axis, especially in prosthodontics, to restore lost natural teeth. There is no classification system that exists in relation to posterior reference points.
Review results: Many authors have come up with various theories to locate the arbitrary hinge axis. The perplexing part in remembering these posterior reference points are eliminated by arriving at a classification system.
Conclusion: Depending upon the anatomical landmark and the accuracy to the true hinge axis, a classification was formulated for ease of understanding and learning purpose.
Clinical significance: Achieving a stable restoration requires the transfer of hinge axis as close to the true axis as possible. To enable this, knowledge about the posterior reference points becomes mandatory. Since there are multiple posterior reference points, a classification system would help ease in remembering them.
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