Do you feel discomfort every time you smile brightly or eat? If your teeth in the mirror are not straight and crooked, or if your upper and lower teeth don't meet properly, you might suspect 'malocclusion'. Malocclusion is an important issue that goes beyond simple aesthetic problems, affecting oral health and even overall systemic health. However, there are various types of malocclusion, and the most effective orthodontic treatment method also differs for each type. Today, as a dental professional medical content writer with 10 years of experience, I would like to delve deeply into orthodontic treatment methods by malocclusion type. I hope this article serves as a valuable compass on your journey to find the optimal orthodontic solution for you and regain a beautiful, healthy smile.

red and white cake on white table
Photo by Quang Tri NGUYEN on Unsplash

Malocclusion: Why Does It Occur and What Problems Does It Cause?

Malocclusion collectively refers to a condition where the upper and lower teeth do not meet normally. It can arise from various causes such as genetic factors, childhood habits like thumb sucking or tongue thrusting, premature loss of permanent teeth, cavities, or trauma. Beyond merely irregular tooth alignment, it can lead to several problems, including:

  • Impaired Masticatory Function: Inability to chew food properly can lead to indigestion.
  • Speech Impediments: Certain sounds may be lisping or unclear.
  • Aesthetic Concerns: Can lead to decreased self-confidence regarding appearance.
  • Poor Oral Hygiene: Food easily gets trapped between crooked teeth, increasing the risk of cavities and gum disease.
  • TMJ Disorders: Abnormal occlusion can strain the temporomandibular joint, causing pain or difficulty opening the mouth.
  • Tooth Wear and Fracture: Excessive force on specific teeth can lead to tooth wear or fracture.

Malocclusion: Main Types and Their Characteristics

Malocclusion can be broadly divided into Class I, Class II, and Class III according to Angle's classification, and also appears in various other forms. Understanding the characteristics of each type of malocclusion is the first step in choosing the correct orthodontic treatment method.

Class I Malocclusion: Tooth Alignment Problems

This is the most common type, where the bite of the upper and lower molars is relatively normal, but there are problems with the alignment of individual teeth, including the front teeth. The main discomforts are aesthetic issues and difficulty with oral hygiene management.

  • Crowding: Occurs when there isn't enough space for teeth to erupt, causing them to overlap or become crooked.
  • Spaced Teeth (Diastema): Occurs when gaps appear between teeth, making them look spaced out.
  • Impacted Teeth: Teeth that are embedded in the gums and unable to erupt can also be accompanied by Class I malocclusion.

Class II Malocclusion: Protruding Upper Jaw or Receding Lower Jaw

This occurs when the upper jaw is relatively forward compared to the lower jaw, or conversely, when the lower jaw is set back. It is often referred to as 'protruding mouth' or 'receding chin'. Aesthetic problems in the profile are prominent, and the front teeth not meeting properly can also affect masticatory function.

  • Protrusion (Protruding Mouth): Occurs when the upper front teeth protrude excessively forward, making the lips appear thick or making it difficult to close the lips.
  • Receding Chin (Retrognathism): Occurs when the lower jaw is set back relative to the upper jaw, making the jawline appear indistinct.
  • Deep Bite: Occurs when the upper front teeth excessively overlap the lower front teeth, making the lower front teeth almost invisible.

Class III Malocclusion: Protruding Lower Jaw (Underbite)

This occurs when the lower jaw protrudes forward more than the upper jaw, commonly known as an 'underbite' or 'prognathism'. From the front, the lower jaw appears prominent, and in profile, the lower jaw extends far forward. It can make it difficult to bite off food and may cause speech problems.

  • Underbite (Prognathism): Occurs when the lower jaw protrudes forward more than the upper jaw, making the impression appear strong or the jawline look long.
  • Anterior Crossbite: Occurs when the upper front teeth bite inside the lower front teeth.

Other Malocclusions: Open Bite, Crossbite, etc.

In addition to the three classifications above, various other forms of malocclusion exist.

  • Open Bite: Occurs when the upper and lower front teeth or molars do not meet, leaving a gap. Anterior open bite, in particular, makes it difficult to bite off food and causes lisping.
  • Crossbite: A condition where the upper teeth bite inside the lower teeth. It can occur on specific teeth or throughout the entire arch.

Customized Orthodontic Treatment Methods by Malocclusion Type

Now, let's explore in detail which orthodontic treatment methods are effective for each type of malocclusion. Modern orthodontics aims for comprehensive treatment that goes beyond simply straightening teeth, considering jawbone growth control and overall facial balance.

Class I Malocclusion Treatment Methods

Class I malocclusion primarily focuses on tooth movement. A relatively wide range of orthodontic appliances can be applied, chosen considering the patient's lifestyle and aesthetic demands.

  • Traditional Braces: Uses metal, ceramic, or lingual braces to move teeth to the desired position. It can effectively improve crowding, spaced teeth, and crooked tooth alignment.
  • Clear Aligners: Uses transparent plastic aligners, such as Invisalign, for discreet orthodontic treatment. It is particularly popular among adult patients who prioritize aesthetics. Effective for mild crowding or spaced teeth.
  • Partial Orthodontics: Applied when only a few specific teeth need alignment changes, without the need to treat all teeth. Can be completed in a relatively short period.
  • Extraction Orthodontics: In cases of severe crowding where there is significantly insufficient space for tooth alignment, treatment may involve extracting small molars or other teeth to create space before proceeding with orthodontics.

Class II Malocclusion Treatment Methods

Class II malocclusion requires consideration of jawbone growth and position, so the treatment approach may differ for growing children and adults. Especially for protruding mouths or receding chins, overall facial harmony is crucial.

  • Growing Children (Dentofacial Orthopedics): Uses appliances to control jawbone growth by utilizing growth potential. Through devices like headgear or functional appliances, it aims to inhibit upper jaw growth or promote lower jaw growth to balance the upper and lower jawbones. Early treatment is very important.
  • Adults (Extraction and Non-Extraction Orthodontics):
    • Extraction Orthodontics: For protruding mouths, small molars are extracted, and the resulting space is used to retract the front teeth, improving protrusion.
    • Utilizing Mini-screws (TADs): Small screws are implanted into the alveolar bone to serve as anchorage for tooth movement, enabling more effective and precise tooth movement. They are particularly useful in treating protruding mouths.
    • Orthognathic Surgery: When the skeletal discrepancy between the upper and lower jaws is very severe, orthodontic treatment alone has limitations. In such cases, orthognathic surgery (e.g., two-jaw surgery) is performed to directly reposition the jawbones, followed by...