a turning point

[mohill]

I would like to have a pithy but non-trite expression that means 'a turning point.'

The context is an article on the history of artificial resuscitation involving rhythmic pressure on the chest.This procedure was considered suspect through the 19th century until an American specialist in the 1880s demonstrated how it may be done safely.  His demo proved to be 'a turning point' as far as acceptance and development of the process was concerned.

Can anyone provide an appropriate alternative to the words 'a turning point' ?  It may well be that this is as good as it could be. 

Thanks.

[Quizmonster]

"His demo proved to be pivotal as far as..."

[Fibonacci]

his demo proved to be a "landmark"

his demo proved to be "crucial"

[Jackanory]

It was 'a defining moment',  but 'turning point' is good.  :o)

[Johnmof]

How about Watershed? Defined as a moment of decisive change.

[mohill]

Thanks to both of you.

As ever your responses are right on the mark.

I like 'pivotal' and I like 'crucial' and would be happy to use either. 'Landmark' is also accurate and acceptable.

I am sure you won't mind if I leave it another hour or so in case there are other suggestions. 

[pega]

   His Demo was an Epiphany all had been revealed and it changed all their misgivings.

[mohill]

My thanks to all of you.

You have helped greatly and I have appreciated the variety of your suggestions.

Cheers