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Underdevelopment In The Lower Jaw

In the third video we studied the effects of midface underdevelopment in the top jaw.

Today, let’s have a look at the lower jaw.

The lower jaw is the only mobile bone in the human skull.

The top jaw is strongly fixed to the base of skull, but the bottom jaw can move in all the three dimensions.

This jaw is jointed to the temporal bone. The distance between this joint and brain is very short, sometimes less than 2 mm.

As opposed to the upper jaw, the length of the lower jaw – the red line- is being dictated by genetics and is not affected by environmental factors.

However, – as you see in these pictures – its shape can be affected due to different conditions which I will explain later.

Now, this is the question:

As a mobile bone, where does this jaw sit?

Can it sit wherever the body likes, can it stay wherever our muscles feel relax?

In an edentulous person the answer is yes, it can.

However, in a person who has teeth, the lower jaw is obliged to sit exactly where the teeth come together.

 

Therefore, if the top jaw is well developed, the lower jaw can come and stay forward.

Inversely, if the top jaw is underdeveloped and back, the lower jaw will become locked behind.

 

A question:

in a person with an underdeveloped upper jaw and lower jaw, which is pulled behind by the muscles, does the body physiology accept it, can the body adapt with this underdevelopment?

If it is against the physiology, how does the body manage it and which parts of the body will be affected?

We will see that this condition is extremely unacceptable for the physiology, and the body faces this issue as a life-threatening problems.

 

The resulted stress from the restricted and confined lower jay will be directly transferred to three destinations.

 

The first affected site is the body of the lower jaw.

The lower jaw has to grow to the limits which genetics dictate, and when it is limited in front by the top jaw, there is no other option for the lower jaw to grow downward instead of forward.

As a result, the jaw angles opens and face height elongates.

The second sites which are affected by the caged lower jaw are the joints and the linked muscles.

Temporomandibular joint issues, resulted headaches, and face muscles pain.

 

A question:

Why can’t the joint adapt to this problem? For example, why doesn’t the body move the joint location?

Because the joint is extremely close to the brain and as mentioned in video number two, the body is very serious in protecting the brain.

Unfortunately, there are many patients with undiagnosed joint problems who are diagnosed and treated for migraines.

Last, and certainly not the least important part which is affected, is the area behind the jaw.

Let’s see what we have behind the jaw.

The most important elements are the airway, the back bone, and the spine.

The airway is empty, filled with air. It doesn’t have a rigid wall which can protect it from collapse.

It is like an elastic hose rather than a rigid pipe.

When the jaw is not free to go forward, it presses the backside structures, and this empty elastic tube is the most vulnerable part to be affected, the front wall of the hose is pressed to the back, so the tube gets narrower, restricting the air flow.

This restriction will result in: Difficulty breathing, snoring, sleep apnea, high blood pressure, and many more troubles which I am going to discuss under the sleep topic.

At this step, airflow drops and the blood oxygen falls.

Oxygen is the most vital element for the body; thus the red alarm starts signaling.

The body is ready to sacrifice anything else to achieve enough oxygen for the brain.

There is no other option rather than pushing the spinal cord behind, so the vertebrae starts turning.

When the spinal column turns in the neck area, it won’t be limited to the top part, the spinal cord is continuous from the neck to the tail.

So, even the hip bones can be affected.

The person may start crippling.

Asymmetries in the body may appear: one shoulder up another one down.

Neck pain.

Back pain.

Leg issues.

And many more problems.

Now let’s have a short discussion about the wisdom teeth.

When someone chews something hard, the superficial tooth layer which is called enamel starts to be worn away.

This wearing effect not only affects the chewing surfaces of the teeth, but it also wears away the surfaces between the teeth.

It means that during the wearing process the teeth are getting both flatter and thinner.

 

The wisdom teeth were supposed to erupt at the age when all the present teeth are worn, flatter, and thinner than the time they had erupted.

Today they are not worn enough, and on the other hand, the jaw circumference, which is the tooth bearing area, is not big enough.

Imagine there is a party for 16 people, you and your friend are the last invited people enter the dining room.

You face a shocking scene, a very small table which is occupied with obese people, there is not enough space even for the seated guests.

What options do you have to sit at the table?

This is exactly the scenario which happens very frequently for the modern humans.

That’s why the wisdom teeth either stay unerupted or erupt in a wrong position and direction.

In the next video, I will discuss the effects of the underdeveloped midface on our beauty and posture.

Thereafter, we will have a look at the growth process in a nongrowing person.

Have a great time,

See you soon.

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