Malocclusion: Causes, Types, and Treatment Methods with Orthodontics

Malocclusion is the improper alignment of the upper teeth with the lower teeth when closing the mouth. It is one of the most common oral health problems among both children and adults. The World Health Organization classifies malocclusion among the three major oral health problems that affect overall health, due to its wide-ranging effects that are not limited to aesthetic appearance alone.

The effects of malocclusion extend to chewing, speech clarity, breathing, as well as the health of the gums and the internal tissues of the teeth. Neglecting treatment for a long period may increase the difficulty of correcting the position of the upper and lower teeth later and increase the likelihood of other complications, such as temporomandibular joint pain. Therefore, early recognition of the problem and understanding its causes greatly helps in choosing the appropriate treatment at the right time, whether for children or adults.

What Are the Common Types of Malocclusion?

Cases of dental malocclusion vary in their form and severity, and they may appear individually or in combination with more than one type at the same time. The most common types include:

• Deep Bite (Overbite): It occurs when the upper teeth cover the lower teeth to a greater extent than normal when the mouth is closed. Severe cases may lead to increased pressure on the teeth and gums. They may also affect the appearance of the lower jaw and cause wear of some teeth over time.
• Open Bite: It is characterized by the lack of contact between some of the upper and lower teeth when the mouth is closed. It often appears in the front teeth. Some cases may be associated with oral habits such as thumb sucking or tongue thrusting. It may also affect the pronunciation of some sounds and chewing.
• Crossbite: It occurs when some upper teeth are positioned inside the lower teeth instead of being outside them in the normal way. It can appear in the front or back teeth and may affect one side of the mouth or both sides. In some cases, leaving it untreated may lead to irregular jaw growth or increased pressure on some teeth.
• Crowding: It occurs when there is not enough space within the jaw to accommodate all the teeth properly, causing the teeth to appear overlapping or twisted. Crowding does not only affect the appearance of the smile, but may also make it more difficult to reach some areas with a toothbrush and dental floss, increasing the likelihood of plaque accumulation, gum problems, and tooth decay.
• Spacing: It appears as spaces larger than normal between the teeth. It may result from small teeth compared with the size of the jaw, the loss of some teeth, or other factors affecting the arrangement of the teeth. The degree of spacing varies from one case to another and may appear between the front teeth or in different areas of the mouth.
• Overjet: It refers to the noticeable forward projection of the upper front teeth compared with the lower teeth. It differs from a deep bite, which depends on the vertical amount of coverage of the lower teeth. Severe overjet may increase the likelihood of the front teeth being exposed to trauma or fractures, especially in children and people who participate in certain sports activities.

Each of these types requires a careful evaluation by a dentist to determine the severity of the condition and whether it requires a simple intervention or a more complex treatment plan before starting any treatment approach.

Causes of Malocclusion in the Mouth

1- Genetic Causes: Why Do Some People Inherit Malocclusion?

Genetics plays a major role in determining the shape and size of the jaws and the upper and lower teeth. Some families have a clear genetic predisposition to certain conditions, such as protrusion of the lower jaw, medically known as Class III, or a smaller upper jaw compared with the lower jaw.

There are also congenital factors that directly affect jaw growth from birth, including:

• Cleft lip and palate, which interfere with normal jaw growth and affect the path of tooth eruption.
• Genetic syndromes such as Down syndrome, which clearly affect the development of the teeth and jaws together.
• A genetically different size of the upper or lower jaw from the normal size expected for the child’s age.
• Inherited tooth size that is disproportionate to the size of the jaw, causing crowding or spacing.

In these cases, early intervention with orthodontic treatment or growth modification appliances is often necessary to reduce the effect of the genetic factor on the final shape of the jaw.

2- Environmental and Behavioral Causes: Daily Habits That Cause Malocclusion

Away from genetic factors, daily behavioral habits directly contribute to the development of malocclusion, especially in children during the early stages of growth, such as:

• Thumb or finger sucking after the age of five causes noticeable protrusion and spacing in the front teeth. The longer the habit continues, the greater its effect.
• Tongue thrusting against the teeth during swallowing or speaking leads to an open bite and crowding over time.
• Chronic mouth breathing instead of breathing through the nose is associated with abnormalities in jaw growth and may change the entire shape of the face if it continues for years.
• Lip sucking or repeatedly pushing the lower jaw forward negatively affects the position of the upper and lower teeth.
• Prolonged pacifier use is considered a factor similar to thumb sucking in its effect on tooth alignment.

If these habits continue for a long time without intervention or parental awareness, orthodontic treatment may later be required to correct the consequences resulting from them, even after stopping the habit itself.

3- Causes Related to Primary Teeth: Early Childhood Problems

Primary teeth play an important role in guiding the growth of permanent teeth and maintaining the space necessary for their proper eruption. Among the most important problems that arise at this stage are:

• Early loss of primary teeth due to an accident or severe decay, which causes permanent teeth to deviate from their normal path.
• Decay of primary teeth, which changes the path of development of the permanent teeth underneath and affects their eruption timing.
• Failure of primary teeth to fall out at the appropriate time, which obstructs the proper eruption of permanent teeth and causes crowding.
• A small jaw that cannot accommodate the larger permanent teeth compared with the primary teeth.

Therefore, pediatric dental clinics recommend regular follow-up with a dentist from an early age to monitor any problem early before it worsens and requires broader intervention later.

4- Medical Causes: Diseases That Affect Jaw and Tooth Development

There are also general health conditions that can cause malocclusion to develop or worsen. They are often related to overall body health rather than the teeth alone:

• Vitamin D deficiency and rickets, both of which directly affect bone growth and the teething process.
• Chronic tonsillitis, which causes the child to breathe through the mouth permanently, leading to protrusion of the lower or upper jaw.
• Endocrine disorders that affect the rate of jaw growth and the timing of tooth eruption in general.
• Some bone diseases that reduce jaw density and its ability to receive and support teeth normally.

Why Does Orthodontic Treatment Correct Malocclusion?

Orthodontic treatment is considered the medically approved solution for treating malocclusion of various degrees, for the following reasons:

1. Improving chewing, speech, and breathing functions significantly and gradually throughout the treatment period.
2. Making the process of cleaning the teeth easier, which reduces the chances of tooth decay and gum inflammation resulting from crowding.
3. Improving the overall aesthetic appearance of the smile and significantly increasing self-confidence after treatment is completed.
4. Reducing the risk of protruding teeth being fractured or injured as a result of daily accidents.
5. Helping reduce abnormal pressure on the jaw joint, which reduces pain or headaches associated with it.

These combined benefits make treating malocclusion a necessary step rather than merely an aesthetic option, especially in moderate and severe cases.

Types of Orthodontic Treatment for Malocclusion

There are currently several types of orthodontic treatment available, and the most suitable type can be selected according to each patient’s condition, age, and severity of malocclusion:

Metal Braces

Metal braces work through metal brackets bonded to the teeth and an orthodontic archwire that passes through them and acts as a flexible support that stores force and transfers it to the teeth. The orthodontist controls the direction and amount of movement by changing the shape, thickness, and material of the archwire during regular visits. This allows all types of tooth movements to be performed with high precision, such as closing spaces, correcting tooth rotation, moving tooth roots, and expanding the dental arch.

For this reason, they are considered the first choice for treating moderate and severe cases of malocclusion, such as severe crowding that requires moving teeth over large distances, deep bites that require raising or lowering the front teeth, and crossbites that require moving the teeth in a specific direction. They are also used in Class II and Class III malocclusion cases that sometimes require elastics between the jaws to correct the relationship between them.

Ceramic Cosmetic Braces

Ceramic braces are similar to metal braces in their mechanism and components, but they use brackets made of ceramic material that is close to the natural color of the teeth or relatively transparent, making them less noticeable when smiling and speaking.

They treat the same cases of malocclusion treated by metal braces, but an orthodontist may prefer to avoid them in cases that require very high forces or low friction, because ceramic brackets are more prone to breakage and have higher friction with the archwire, which may affect the speed of tooth movement in some cases.

Clear Aligners

Clear aligners work through a mechanism different from fixed braces. The entire treatment plan is digitally designed before treatment begins, and tooth movement is divided into small successive stages. A clear aligner is made for each stage to move the teeth by a fraction of a millimeter at a time. The aligner is replaced every one to two weeks to achieve the next movement until reaching the final positions planned.

To improve movement control, small tooth-colored attachments are sometimes bonded to some teeth. They act as anchor points that help the aligner apply force in the required direction with greater precision.

Clear aligners are more effective in mild to moderate cases of malocclusion, such as mild to moderate crowding, small spaces, and correction of the alignment of the front teeth. Their accuracy decreases in cases that require significant root movement, closing large extraction spaces, or correcting severe tooth rotation. Therefore, the orthodontist determines their suitability after carefully evaluating the condition.

Growth Modification Appliances

These appliances differ fundamentally from the previous types. They do not primarily move the teeth but target the correction of skeletal malocclusion resulting from an imbalance in the size or position of the jaws. They work by utilizing the natural forces of the oral and chewing muscles and redirecting them to modify the growth of the jawbones during the growth period.

For example, in Class II malocclusion cases, these appliances hold the lower jaw in a forward position, stimulating and directing its growth forward and improving the relationship between the jaws.

The pubertal growth spurt is considered the optimal time to use them, as the jawbone is more responsive to guidance and modification. This cannot be achieved after growth is complete, when fixed orthodontic treatment or orthognathic surgery may become necessary. Therefore, early diagnosis of malocclusion during childhood is a crucial factor in the success of this type of treatment and in avoiding later complications.

What Is the Best Age to Start Orthodontic Treatment?

It is recommended not to delay the first orthodontic examination, as the American Association of Orthodontists recommends that a child have their first orthodontic examination at around the age of 7, even if no obvious problem has appeared yet. In general, the appropriate timing for orthodontic treatment can be divided as follows:

1. Children: The best period for therapeutic intervention is during the growth spurt, approximately between the ages of 10 and 14, when the jaw responds better to modification.
2. Adults: There is no specific or maximum age for orthodontic treatment. Treatment can be started at any stage of life as long as the gums and bone are in good condition.

It is worth noting that early intervention reduces the severity of the problem and may eliminate the need for surgical intervention in the future to correct the jaw in some cases.

How Does Wonders Dentistry Plan Orthodontic Treatment?

Wonders Dentistry relies on a precise scientific approach to treating malocclusion cases that includes several basic stages:

1. Comprehensive Diagnosis: Through panoramic X-rays, CT scans, and three-dimensional digital scanning to determine the condition with complete accuracy.
2. Determining the Type and Severity of Malocclusion: To identify the most appropriate treatment plan for each individual case, whether simple or complex.
3. Selecting the Most Appropriate Type of Orthodontic Treatment: It is selected based on the patient’s age, the nature of their specific condition, and their aesthetic needs.
4. Regular Follow-Up: To ensure that the treatment plan progresses correctly and within the planned timeframe.

This approach ensures that every patient receives a fully customized treatment plan instead of applying one uniform solution to all different cases of malocclusion.

A Common Pain Point: “I’m Afraid to Start Orthodontic Treatment and It Won’t Be Suitable for My Case”

This concern is logical and common among many patients who hesitate to make the decision to undergo treatment. To address this concern, Wonders Dentistry develops a customized treatment plan for each case after a thorough and comprehensive diagnosis, based on the belief that there is no single solution suitable for all cases of malocclusion and that every jaw has its own characteristics that deserve individual evaluation.

Conclusion

Malocclusion is a common health problem with multiple causes, ranging from genetic factors and behavioral habits to problems with primary teeth and certain general medical conditions. With the variety of orthodontic treatment options available today, most cases of dental malocclusion can be treated effectively, provided that an accurate diagnosis is made and the appropriate treatment plan is selected for each individual case, whether the patient is a child in the growth stage or an adult seeking a more aligned and healthy smile.

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