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Twin Block

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The Standard Twin Block is a removable functional device made up of two interlocking bite blocks (upper and lower) that fit together at a 70-degree angle, positioning the mandible in a more forward posture. This movement of the mandible gradually reduces the overjet. When the acrylic from the upper block is removed, the lower first molars can erupt, thereby addressing the overbite. At the end of Twin Block treatment, the first molars will be in contact, and maxillary and mandibular incisors will align properly. During the mixed dentition phase, the molars typically erupt passively, while in the permanent dentition, they may require active eruption using vertical elastics.

To prevent a dual bite, the should be worn for at least 7 to 9 months. the bite is stable, the mandible should not be able toude without causing discomfort. After completing the first treatment phase and achieving the desired vertical and anterior-posterior position, a Phase 2 or “Support Appliance” must be placed.

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The Standard Twin Block features an upper block that covers the second primary molar or bicuspid, as well as the first and second molars. The lower block encompasses the first primary molar and two-thirds of the second primary molar. For the Block treatment to be effective, it is crucial that the lower block remains positioned ahead of the upper at all times. To ensure this, the blocks must have a thickness of at least 5 to 6 mm. If they are thinner, adjusting them to accommodate the eruption of the lower first molars could compromise the interlocking effect of the blocks. Additionally, proper appliance retention is essential for the success of this device. If the first primary molars are not expected to remain for 7 to 9 months, or if the bicuspids have not erupted sufficiently, it may be advisable to consider an alternative appliance or postpone treatment until adequate retention can be achieved. Note: The expansion screw included in this design can also be utilized to lateral arch development simultaneously.

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