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KMID : 0378419910110120011
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Dental Focus
1991 Volume.11 No. 12 p.11 ~ p.17
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Two treated cases of scissor bite using the precision lingual arch
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Abstract
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Many orthodontists and general dentists have suffered from scissor bite which means a type of posterior cross bite, exhibiting linguoversion of lower molar and buocoversion of upper molar.
Criss-cross elastic has been used to correct this problem but this method has many side effects. For example, extrusion of involved tooth and opposing apron. tooth, those induce increasing vertical dimension and rotating the mandible forward and downwardly. To reduce the bite raising, occlusal reduction and endodontic therapy must also be done.
The other way is the conventional Lingual arch ( sheath type ) as an anchorage and sectioal wire to upright the involved tooth. Unfortunately, for interfering with the bite it is impossible to weld or bond the tube to the buccal side of tooth.
To correct the scissor bite precisely the precision lingual arch was developed recently by Dr. Burstone ( 1988 ). The precision lingual arch uses a pretorqued .032 ´ X .032 ´ wire that fits accurately into a pretorqued .032 " slot. Stiffness can be varied by choosing either a stainless steel wire for high stiffness or TMA for low stiffness. Unilateral torque can be used to correct molar cross-bite. The distance across the lower arch is so great that the vertical side effects are small and would likely be eliminated by the force of occlusion.
The next two scissor bite cases were corrected using the precision lingual arch.
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