Jaw blocks, also known as twin blocks, are orthodontic appliances that resemble acrylic blocks or pads. They are specifically designed to correct jaw misalignment by repositioning the lower jaw forward.
Understanding Twin Block Appliances
These appliances are made of two separate pieces, usually appearing as plastic blocks. They work in tandem to achieve the desired jaw movement:
- Upper Block: This block covers the upper molars.
- Lower Block: This block covers the lower bicuspids.
When the patient bites, these blocks interlock in a specific way that forces the lower jaw into a forward position. This continuous repositioning gradually encourages the lower jaw to maintain this new alignment over time.
How Jaw Blocks Work
The primary function of jaw blocks is to correct a condition where the lower jaw is set too far back (retrognathia). The mechanism behind their effectiveness can be explained as follows:
- Interlocking Design: The blocks are designed to fit together uniquely, which forces the lower jaw to move forward upon biting.
- Continuous Pressure: This forward position is maintained with each bite, putting continuous pressure that encourages gradual repositioning of the jaw.
- Permanent Change: Over an extended period of wear, the jaw structure adapts to this forward position, thus creating a more balanced bite and facial profile.
Practical Insights
- Material: Usually made of acrylic, these blocks can be customized to fit the patient’s mouth comfortably.
- Wear Time: Jaw blocks must be worn as prescribed by the orthodontist, usually for a significant portion of the day, to achieve effective results.
- Orthodontic Treatment: The use of jaw blocks is generally a part of a broader orthodontic treatment plan.
Benefits of Using Jaw Blocks
- Corrects Jaw Misalignment: Effectively repositions the lower jaw, which improves bite and facial aesthetics.
- Non-Surgical: Offers a non-surgical solution to jaw correction in many cases.
- Improved Facial Harmony: Corrects the patient’s facial profile by addressing jaw recession.
