Golden Proportion – Test

Test – Golden Proportion


This is a measurement developed by Dr. Hank Shimbashi of Edmonton. Working on a university project to determine proper facial heights and the position of upper and lower teeth while the patient is biting on the back teeth, he found a direct correlation between the distance of the gum tissue from the upper teeth to the lower teeth. This relationship became known as the “Golden Proportion” for a healthy bite.

Normal healthy bites have a distance from 17 to 21 mm, which  can be estimated by determining the width of an upper front tooth (or Central Incisor). The wider the Central Incisor, the higher the Shimbashi number.

The Shimbashi number gives us a guide as to where the comfort zone for your bite should be. Although it is not the only factor, it does help us to distinguish obvious over-closed bites.

For more information on the Golden Proportion, please visit the following website: