Normal teeth are up and down, the cuspid is aligned with the normal bite, that is, the nest of the upper row of teeth, just right for the tip of the lower row of teeth, the upper row of teeth is in front, the upper row of teeth covers about one-third of the lower row of teeth, and when chewing, the jaw is also in a very stable state.
Once the bite is deep or more, it will produce a deep cover, tooth decay or a ground cover, and instead it becomes a jaw opening condition, which is abnormal.
Normal occlusion
<h1 class="pgc-h-arrow-right" data-track="4" > how to tell if the bite is normal? </h1>
First, let's look at the need for good bites to meet these 6 criteria:
1, look at the relationship between teeth grinding and opposing
Taking the bite of the first large tooth and the first fang as the standard, the cuspid fossa should be opposite, and the tip of the first fang is aligned with the gap between the two fangs below, if it does not match, it means that the bite is abnormal.
2. The teeth are near and far inclination
The angle composed of the long axis of the clinical crown of the tooth and the vertical line of the jaw plane is the crown angle or the axis inclination, which represents the degree of inclination of the tooth near and far, and the crown angle is positive when the gingival end of the clinical crown long axis is tilted to the far middle, the crown angle is negative when it is tilted near the middle, and the crown angle of the normal jaw is mostly positive.
3. The teeth lip is tilted and the tongue is tilted
In layman's terms, it is to see whether the teeth are tilted to the lips or to the tongue, in general, the crown of the upper incisor is inclined to the lip side, the lower incisor is close to the upright, from the cuspid teeth, the upper and lower tooth crowns are tilted to the tongue side.
4. Normal occlusion should have no improper tooth rotation, and the posterior teeth occupy more near and far median spaces after rotation, and the front teeth are just the opposite, occupying less near and far median spaces.
5, look at the contact with the neighbor, that is, each tooth and the neighbor's tooth are in close contact, there is no gap.
6, look at the jaw curve, if the bite curve of the tooth is relatively flat is normal, upward bending or downward bending degree is too large, it is a problematic bite.
Generally, professional orthodontists will refer to these six standards and make specific adjustments according to the clinical dental situation.
In addition, you can also look at your own chewing situation, generally normal bite when the teeth are point contact rather than surface contact, if the tooth bite contact area is small, it will lead to low chewing efficiency, in severe cases, all teeth can not participate in chewing at the same time, grinding teeth can not be forced, teeth collide with each other when chewing.
Because chewing function is related to oral health, long-term bite failure can lead to the following conditions:
It can also lead to tooth wear, alveolar bone absorption, tooth loosening, etc., such as deep coverage will also lead to the lower jaw contraction, thereby compressing the airway, causing airway narrowing, affecting normal respiratory function.
Therefore, regarding the problem of upper and lower bites of teeth, we must treat them correctly, and once we find that our teeth bite is not normal, we must adjust them in time.
#Orthodontics # #深覆盖 #