Abstract
The aim of this report was to find a way leading to WHO's CPITN from the morphological point of view.
Materials and methods were as follows. For the gingiva of monkeys, additional lines was attached to the probe of CPITN and a measure cord of the probe was reconstructed. A certain gingival area of cynomolgus monkeys was measured with this instrument, whose results were classified in the code order. At the same time, the specimens were prepared for light and electron microscopic examination.
The results showed that the histological changes formed a link in the code order. Whereas the change became sometimes out of order, one corresponding to the later code appearing earlier.
From these facts, a futher survey of CPITN code may be desirable, taking into consideration of the following points.
1. One item (bleeding, calculus, depth of gingival pocket) must be analyzed under each code, i. e. each item is not referred to a certain code but distributed to every code, under which item must be estimated.
2. One for epidemiology and the other for treatment needs should be prepared separately.
3, Special diseases and clinical cases (hypertrophy, bone disease, etc.) must be considered.
