Six thoughts on the six keys to good occlusion

In 1989, a Californian orthodontist, Lawrence F. Andrews, published a book where he accurately described his landmark invention and a concept behind it. I am honoured to have a signed copy of this historic text, which he gifted me four years ago while I was travelling across America. Being an undisciplined reader, I let sit it on the shelf till last Christmas.

The book Straight Wire: The Concept and Appliance tells the story of how a study of 120 casts of naturally optimal occlusion lead to the development of the first preajdusted appliance. It is a carefully written text explaining basic concepts of the straight-wire appliance. It has plenty of beautiful drawings, but from the viewpoint of a clinician the most exciting feature of the book is apparently 200+ photos of before and after dental casts. These are the records from 1960s and 1970s collected by a number of orthodontists. The quality of the results is exceptional.

I decided not to indulge myself into retelling the six keys and straight-wire philosophy, but rather write my own subjective ideas loosely based on the book…

six keys.jpg

Here they are:

1. What you have learned is not really important until you apply it.

If the straight-wire appliance hadn’t been developed, the six keys would have been just a collection of abstract observations.

2. Be thankful for what you have.

The invention of the straight-wire appliance in 1970 has greatly reduced the number of archwire bends and made the lives of many orthodontists around the globe much easier. However, the simplification of several procedures has let some people believe that the entire orthodontic treatment is very easy to perform. This, in turn, has increased the number of poorly trained practitioners.

Nevertheless, I think that the advantages of the straight-wire appliance outweighs the negative consequences. And we have to be thankful for the fundamental virtues embodied into the appliance we use on a regular basis.

The third edition of the book

3. There is no one-size-fits-all solution.

Despite the versatility of the appliance, it always requires specific adjustments for each and every patient and fine-tuning at the finishing stage of the treatment (not to mention diagnostics and treatment planning, which has nothing to do with any appliance apart from our brain). There is no such thing as 100% preadjusted appliance.

4. Sometimes it’s fine not to follow the rules.

No doubt, we have to keep in mind the six keys, but we also have to understand that in some cases it is prudent not to aim for meeting all of the them.

5. Truth speaks softly.

Travelling across America four years ago, I met a number of famous orthodontists, most of them were great speakers. Andrews was one of the last on my list and I had never heard him speaking before. I was excited and worried to meet the man who has turned the orthodontic world upside down. I expected to meet a charismatic leader with a powerful voice and radiant energy. I was surprised to meet a man who spoke slowly and quietly, almost stammering at times. I felt like Dorothy meeting the Wizard of Oz. His manners contrasted with those of notorious popular opinion leaders who go to great lengths to glamourise new appliances and companies they are affiliated with. Where there is shouting, there is no true knowledge.

6. If you have some observations, organise them into points – let’s say six – and this will be well perceived by the public.


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