Partial erupted bonded bracket to be applied to second molars that must be bonded, but are not fully erupted through the tissue. This bracket is especially needed in the upper 7-extraction diagnosis to prevent super-eruption of the lower molar. The bracket is applied to the “mesial” cusp of the tooth, NOT the center of the tooth mesial-distal. This bracket is also especially useful at the start of finishing when the lower second (or third) molar is in a poor position, but cannot yet be banded. The bracket is designed with a standard Roth prescription, except that there is no mesial rotation (torque –25, angulation 0, mesial rotation 0).
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Standard Roth bonded bracket with a single, non-convertible buccal tube, and a mesial hook. Torque –25, angulation 0, mesial rotation 5. Used to apply forces to lower 7s when there is good access to these teeth for bonding. It would be common to use a bonded bracket when the bonding takes place at the start of the finishing stage. In this application, the light finishing wires can be easily engaged, and cinchbacks are rarely used. Bonding lower 7s should be avoided when planning significant mechanics with heavy rectangular wires, or in cases with skeletal closed bite. Using light cure bonding adhesives can improve the retention of brackets bonded to posterior teeth. Bonding of lower 7s has better results in cases where the upper 7s have been extracted. Do NOT position the lower 7 bonded brackets more gingival than recommended to avoid occlusal forces. This will cause extrusion of the second molar relative to the other teeth, resulting in bite opening. Lower 7s should be bonded or banded in all skeletal open bite cases to control bite opening, and in dental deep bite cases to level the curve of spee.
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