|SHORT COMMUNICTION: CLINICAL INNOVATION
|Year : 2016 | Volume
| Issue : 4 | Page : 272-273
Modified posterior bite block for scissor bite correction
Umal Hiralal Doshi
Reader, Department of Orthodontics, CSMSS Dental College, Aurangabad, Maharashtra, India
|Date of Submission||07-Jan-2016|
|Date of Acceptance||21-Apr-2016|
|Date of Web Publication||19-Oct-2016|
Umal Hiralal Doshi
UPHAR, 68 Builders Society, Near Nandanvan Colony, Aurangabad, Maharashtra
Source of Support: None, Conflict of Interest: None
Scissor bite or complete buccal crossbite can be limited to a single tooth or group of teeth. It is most commonly seen with second molars. Treatment modalities to correct the buccal inclination of maxillary second molar along with lingual inclination of mandibular molar is limited to use of cross-elastics or recently, use of micro-implants. Present case describes a simple method to correct such single tooth scissor bite with minimal side effect of extrusion and no need of any surgical intervention.
Keywords: Bite Block, posterior, scissor Bite
|How to cite this article:|
Doshi UH. Modified posterior bite block for scissor bite correction. J Indian Orthod Soc 2016;50:272-3
| Introduction|| |
Scissor bite or buccal crossbite is a complete buccal crossbite resulting due to buccally inclined maxillary posterior teeth and/or lingually tipped mandibular posterior teeth. It is frequently seen with second molars unilaterally or bilaterally. Several treatment procedures have been proposed as nonsurgical options for correcting a simple posterior scissors-bite, including intermaxillary cross-elastic appliance, transpalatal arch appliances with intra-maxillary elastics,, lingual arch appliances with intra-maxillary elastics. Almost all these methods use elastics that generate extrusive forces on the anchorage teeth in both jaws and possibly induce undesirable decreases in the overbite, clockwise rotation of the mandible, and premature contact. In addition, patient's compliance is a problem. To overcome these problems use of micro-implants have been suggested, but the placement of implants remains a surgical procedure with its potential side effects.,,
In most severe scissor bite cases opening of bite become necessary. To that end use of posterior bite, blocks may become necessary. Present technique demonstrates a modification of conventional fixed bite blocks which provided a simple and effective way to correct right side second molar scissor bite in an adult patient [Figure 1]a. Scissor bite was because of buccal tipping of the right maxillary second molars with lingually inclined right mandibular second molar.
|Figure 1: (a) Second molar scissor bite on the right side (b) appliance design (c) intra-oral placement of the elastic chain and blue elastic (d) after scissor bite correction|
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| Appliance Fabrication|| |
Wax bite was taken with 5 mm opening in first premolar area, which provided clearance for the second molar scissor bite correction. Casts along with wax bite were mounted on hinge articulator. Wire parts were constructed using hard 1 mm stainless steel wires. On palatal side, transpalatal arch was adapted with one extension arm having a hook 10 mm away from cervical margin and at centre of the long axis of right side second maxillary molar. An extension wire with hook was prepared and during acrylisation it was placed in maxillary bite block in such way so that hook was on buccal side, close to cervical margin of right side mandibular second molar. Appliance was acrylised with self-cured acrylic resin. Second maxillary molar on the right side was not included in the appliance while on left side complete posterior arch was included. Right- and left-sided blocks were connected by transpalatal arch with palatal extension on the right side. Buccal extension hook on the right side was embedded in the right bite block.
| Placement and Treatment Progress|| |
The appliance was cemented with glass ionomer cement. On right second maxillary molar a 0.022 MBT second molar tube was bonded using Transbond XT adhesive (3M Unitek, Monrovia, California, USA). Right mandibular second molar received band with prewelded lingual button. Elastic chain was placed from maxillary second molar tube hook to palatal hook [Figure 1]c. The patient was given blue elastics with 3.5 oz force to be placed from lingual button on right mandibular second molar to buccal extension hook [Figure 1]c. The patient was instructed to change the elastic on daily basis. Elastic chain on maxillary second molar was replaced after every 2 weeks. In 3 months unilateral second scissor bite was corrected [Figure 1]d. The appliance was removed with no further retention.
| Discussion|| |
Present technique has following advantages:
- Design is versatile. It can be modified depending on number of teeth or sides to be corrected. It can also be used for only intra-maxillary correction of buccally tipped maxillary molars or can be used for both intra-maxillary as well as inter-maxillary correction simultaneously as in present case [Figure 1]. Since inter-maxillary correction is carried out through extension hook the extrusive effect on maxillary molar is negated
- Use of bite block ensures sufficient bite opening for rapid correction
- The placement of extension hooks can be managed so that the lingual tipping of maxillary molar and buccal tipping of mandibular molar will exhibit intrusive forces [Figure 2]. This means there will be no premature contacts after appliance removal.
| Conclusion|| |
This is a simple, cost-effective, rapid, and versatile technique for second molar scissor bite correction.
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Conflicts of interest
There are no conflicts of interest.
| References|| |
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[Figure 1], [Figure 2]