A lower second molar is tipped mesially. A coil spring is placed to correct it. What will this cause to the OPPOSING TOOTH?

Supraeruption and increased overbite (B). When a mandibular molar is uprighted (tipped mesially → corrected to upright), it effectively moves apically/inferiorly in the arch, creating space superiorly (occlusally). This lack of occlusal contact allows the opposing maxillary tooth to supraerupt (overerupt) into the newly created space.

• As the maxillary tooth supraerupts, it increases the overbite in that region.
• Molar uprighting is a common pre-prosthetic orthodontic procedure (e.g., before implant placement in the space) but requires monitoring of the opposing dentition.
• An intrusion arch or bite plate may be needed to prevent supraeruption of the opposing tooth during uprighting.