Fixed Appliances

Definition

Fixed Appliances are orthodontic systems where the components are bonded or cemented to the teeth and cannot be removed by the patient. They are used to treat a wide variety of malocclusions by applying precise, continuous forces to achieve three-dimensional control over tooth position.

Components

A standard fixed appliance setup (often called "braces") consists of:

Brackets: Metal or ceramic attachments bonded to the facial or lingual surface of the teeth.
Archwires: The "engine" of the appliance. Initial wires are usually flexible Nickel-Titanium (NiTi), while finishing wires are often rigid stainless steel.
Ligatures: Elastic "modules" or wire ties that secure the archwire into the bracket slot. Self-ligating brackets use a built-in "trap door" to hold the wire without elastics.
Molar Bands/Tubes: Anchors placed on the posterior teeth to stabilize the archwire.
Elastics: Removable rubber bands used to coordinate the upper and lower arches (Class II or Class III correction).

Types of Fixed Appliances

Metal Braces

The most common type, made of high-grade stainless steel. They are durable, cost-effective, and offer the least friction during tooth movement.

Ceramic (Aesthetic) Braces

Made of polycrystalline or monocrystalline alumina. They mimic the color of natural enamel, making them popular with adult patients, though they are more brittle and can cause wear on opposing teeth.

Lingual Braces

Brackets are bonded to the inside (tongue side) of the teeth. This makes them completely invisible from the front but can affect speech and tongue comfort initially.

Self-Ligating Brackets

Systems like the Damon System or SmartClip eliminate the need for elastic ligatures. This is claimed to reduce friction and potentially shorten treatment time in specific cases.

Clinical Advantages

Predictability: Excellent for complex movements like tooth translation (moving the whole tooth, root included) and severe rotations.
Compliance-Free: Since they are fixed, the treatment progresses 24/7 without the patient needing to remember to "wear" them.
Versatility: Can be used in conjunction with Temporary Anchorage Devices (TADs) for extreme skeletal corrections.

Maintenance and Risks

Oral Hygiene: Fixed appliances act as plaque traps. Poor hygiene can lead to "white spot lesions" (decalcification) or Gingivitis.
Root Resorption: Excessive or prolonged force can lead to the shortening of tooth roots.
Soft Tissue Irritation: Brackets may cause initial ulceration of the cheeks or lips, usually managed with orthodontic wax.