Cross Bite 476q33
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MANAGEMENT OF
CROSSBITE
INTRODUCTION Crossbites are term used to describe abnormal occlusion in transverse plane.
The term is also used to describe reverse overjet of one or more anterior teeth.
CROSSBITE
NORMAL
SCISSORS BITE OR TELESCOPIC BITE is present when one or more of the adjacent posterior teeth are either positioned completely buccally or lingually to the antagonistic teeth and exhibit a vertical overlap
DEFINITION GRABER has defined cross bites as a condition where one or more teeth may be abnormally malposed buccally or lingually or labially with reference to opposing tooth or teeth.
CLASSIFICATION Based on their location as: ANTERIOR CROSSBITE and
POSTERIOR CROSSBITE
CLASSIFICATION According to number of teeth involved Anterior crossbite is again classified as
SINGLE TOOTH CROSSBITE and SEGMENTAL CROSS BITE Posterior Crossbite may be further classified according to the existence of the crossbite as
UNILATERAL CROSSBITE and BILATERAL CROSS BITE
CLASSIFICATION Based on the location of etiologic factors as DENTAL CROSSBITE Usually result from arch length discrepancy or an abnormal path of eruption
SKELETAL CROSSBITE Due to malpositioning or malformation of jaws.This can be inherited(as in ClassIII skeletal pattern), congenital(Cleft lip and palate) or due to trauma at the time of birth(unilateral ankylosis of TMJ)
FUNCTIONAL CROSSBITE Due to presence of occlusal interferences
ETIOLOGY
Persistence of a deciduous tooth Crowding or abnormal displacement of one or more teeth Retarded development of maxilla in sagittal as well as transverse direction Narrow upper arch Collapse of the upper arch Unilateral hypo or hyper plastic growth of any jaws Sagittal discrepancies of the jaws such as forwardly positioned mandible. Presence of habits such as thumb sucking and mouth breathing.
RATIONALE FOR EARLY INTERCEPTIVE TREATMENT
Little possibility for self-correction A crossbite in the primary dentition is believed to transfer to the permanent dentition. Postponing treatment results in prolonged treatment of greater complexity If left untreated, it can cause growth modifications and dental compensations May eventually lead to a permanent deviation and craniofacial asymmetry. Associated with an increase in condylar deviation and temporomandibular t sounds
RATIONALE FOR EARLY INTERCEPTIVE TREATMENT
Interference with growth of the middle third of the face Abnormal speech patterns Loss of arch integrity Periodontal disease Undesirable esthetics Root resorption of central incisors
CORRECTION OF ANTERIOR CROSS BITE
CORRECTION OF ANTERIOR CROSS BITE INCLINED PLANE APPLIANCE (CATALANS APPLIANCE) One of the simplest and most effective means of correcting the lingual crossbite of a maxillary incisor is the use of an acrylic or cast metal inclined plane that is cemented to the mandibular incisors opposing to the tooth in crossbite.
INCLINED PLANE APPLIANCE (CATALANS APPLIANCE) The lower inclined plane is constructed at an angle of 45 degee to the maxillary occlusal plane. Cross bite gets corrected very fast and the appliance should not be kept in place for more than six weeks
If there is an open bite tendency the use of a guide plane is contraindicated.
INCLINED PLANE APPLIANCE (CATALANS APPLIANCE) ADVANTAGES 1. Ease of fabrication 2. Rapidity of correction using functional and muscle forces 3. Lack of soreness or looseness of teeth during movement 4. Rarity of relapse. DISADVANTAGES 1 Strong limitation on diet during the wearing of the appliance 2 Creation of a temporary speech defect 3 Tendency to create an anterior open bite if the appliance is left in place too long. 4 Possibility of the appliance becoming loose and requiring recementation because of the strong occlusal stresses upon it. 5 Imperfect alignment of the malposed tooth when the appliance is removed.The dentist must rely on autonomous adjustment for the balance of correction
CORRECTION OF ANTERIOR CROSS BITE HAWLEY RETAINER WITH AUXILLARY SPRINGS The most frequently used appliance for minor anterior crossbite treatment. Acrylic palatal coverage and wire clasps The auxilliary spring or Double cantilever springs activated to exert labial forces on and move the maxillary incisors.
CORRECTION OF ANTERIOR CROSS BITE HAWLEY RETAINER WITH AUXILLARY SPRINGS
The acrylic can be extended to create posterior bite plates to reduce the overbite and raise the bite.
CORRECTION OF ANTERIOR CROSS BITE
APEX SPRING APLLIANCE
CORRECTION OF ANTERIOR CROSS BITE FACE MASK OR FACE MASK ALONG WITH RME Anterior cross bite due to an actual skeletal deficiency of the maxilla can be corrected using a protraction facemask (reverse headgear). If the maxilla is narrow a Rapid Maxillary Expansion screw can be Used to aid in the transverse Expansion of the maxilla
CORRECTION OF ANTERIOR CROSS BITE
CHIN CUP APPLIANCE Anterior cross bite due to a prominent mandible can be corrected using a chin cup appliance. Chin cup appliance redirect the growth of the mandible, and tends to rotate the mandible backward and downward.
CORRECTION OF ANTERIOR CROSS BITE
FRANKEL III APPLIANCE Designed to activate muscle function to guide anterior growth of the maxilla (Stretches the soft tissue envelop around the maxilla stimulating its anterior growth) Redirect growth of the mandible posteriorly. Must be worn at least 14 hours/day Effectiveness in controversy Not the ideal choice for treatment of skeletal class III.
CORRECTION OF ANTERIOR CROSS BITE
SCREW APPLIANCES Acrylic appliances incorporating various size screws can be used to correct either individual tooth or segmental cross bites.MICRO SCREWS, MINI SCREWS OR MEDIUM SCREWS can be used for the purpose.
CORRECTION OF ANTERIOR CROSS BITE
FIXED APPLIANCE Fixed appliance can deliver slow light continuous forces to correct single tooth or segmental anterior teeth cross bite at practically any age.
CORRECTION OF POSTERIOR CROSS BITE
CORRECTION OF POSTERIOR CROSS BITE
COFFIN SPRING In1875 Coffin found the coffin spring
Capable of correcting cross bite in young developing dentition. Appliance is removable and usually well tolerated. Expansion produced is slow. Disadvantage is that frequent activation is needed.
CORRECTION OF POSTERIOR CROSS BITE
SCREW APPLIANCES Various types of screws can be used to correct single tooth or segmental posterior tooth cross bites
CORRECTION OF POSTERIOR CROSS BITE NITI PALATAL EXPANDER These are nickel titanium wire shapes which are attached to ligual sheath that are welded to molar bands cemented to maxillary first permanent molars.
Apply light continuous pressure on the mid palatal suture. Self activated Requires no adjustments
CORRECTION OF POSTERIOR CROSS BITE QUAD HELIX In1947 Rickets introduced the quad helix Fixed Quad helix is soldered to molar bands cemented on first permanent maxillary molars. Reactivation using three pong pliers is done without removing the appliance. The appliance produce slow expansion in adolescent and adult patients and skeletal effects in preadolescents. Forces generated can be increased or decreased depending upon the amount of activation.
CORRECTION OF POSTERIOR CROSS BITE W-ARCH APPLIANCE Use to correct the bilateral constriction in primary dentition. Made of steel wire soldered to molar bands. The lingual wire should the teeth involved in cross bite & extend not more than 1-2mm distal to banded molars to eliminate soft tissue irritation. Lingual wire should remain 1-1.5 mm away from marginal gingival & the palatal tissue. Accelerates the rate of normal expansion of the mid palatal suture in a young child. The appliance delivers proper forces levels when opened 3-4 mm wider than ive width & should be adjusted to this dimension before being inserted.
CORRECTION OF POSTERIOR CROSS BITE FIXED RAPID PALATAL EXPANSION(RPE) Rapid palatal expansion appliance can be used to correct posterior cross bite by expanding the arch bilaterally by opening the mid palatal suture. Opening of the midpalatal suture is possible until about age 16 or 17 before the maxillary sutures fuse After fusion, the suture may be opened with a surgical assist and a fixed rapid palatal expander (RPE)
CORRECTION OF POSTERIOR CROSS BITE RAPID PALATAL EXPANDER is of HYRAX TYPE and HAAS TYPE
More flexible than Haas expander.This again is of two types BANDED and BONDED
More tissue irritation. Haas expander uses acrylic pads and heavy lingual wires to apply pressure to both the teeth and the palatal tissue
CORRECTION OF POSTERIOR CROSS BITE
FIXED ORTHODONTIC APPLIANCES Can be used for correction of posterior cross bite. CROSS ELASTICS can be used to bring about correction of individual tooth cross bites in the posterior segment.
THANKYOU
CROSSBITE
INTRODUCTION Crossbites are term used to describe abnormal occlusion in transverse plane.
The term is also used to describe reverse overjet of one or more anterior teeth.
CROSSBITE
NORMAL
SCISSORS BITE OR TELESCOPIC BITE is present when one or more of the adjacent posterior teeth are either positioned completely buccally or lingually to the antagonistic teeth and exhibit a vertical overlap
DEFINITION GRABER has defined cross bites as a condition where one or more teeth may be abnormally malposed buccally or lingually or labially with reference to opposing tooth or teeth.
CLASSIFICATION Based on their location as: ANTERIOR CROSSBITE and
POSTERIOR CROSSBITE
CLASSIFICATION According to number of teeth involved Anterior crossbite is again classified as
SINGLE TOOTH CROSSBITE and SEGMENTAL CROSS BITE Posterior Crossbite may be further classified according to the existence of the crossbite as
UNILATERAL CROSSBITE and BILATERAL CROSS BITE
CLASSIFICATION Based on the location of etiologic factors as DENTAL CROSSBITE Usually result from arch length discrepancy or an abnormal path of eruption
SKELETAL CROSSBITE Due to malpositioning or malformation of jaws.This can be inherited(as in ClassIII skeletal pattern), congenital(Cleft lip and palate) or due to trauma at the time of birth(unilateral ankylosis of TMJ)
FUNCTIONAL CROSSBITE Due to presence of occlusal interferences
ETIOLOGY
Persistence of a deciduous tooth Crowding or abnormal displacement of one or more teeth Retarded development of maxilla in sagittal as well as transverse direction Narrow upper arch Collapse of the upper arch Unilateral hypo or hyper plastic growth of any jaws Sagittal discrepancies of the jaws such as forwardly positioned mandible. Presence of habits such as thumb sucking and mouth breathing.
RATIONALE FOR EARLY INTERCEPTIVE TREATMENT
Little possibility for self-correction A crossbite in the primary dentition is believed to transfer to the permanent dentition. Postponing treatment results in prolonged treatment of greater complexity If left untreated, it can cause growth modifications and dental compensations May eventually lead to a permanent deviation and craniofacial asymmetry. Associated with an increase in condylar deviation and temporomandibular t sounds
RATIONALE FOR EARLY INTERCEPTIVE TREATMENT
Interference with growth of the middle third of the face Abnormal speech patterns Loss of arch integrity Periodontal disease Undesirable esthetics Root resorption of central incisors
CORRECTION OF ANTERIOR CROSS BITE
CORRECTION OF ANTERIOR CROSS BITE INCLINED PLANE APPLIANCE (CATALANS APPLIANCE) One of the simplest and most effective means of correcting the lingual crossbite of a maxillary incisor is the use of an acrylic or cast metal inclined plane that is cemented to the mandibular incisors opposing to the tooth in crossbite.
INCLINED PLANE APPLIANCE (CATALANS APPLIANCE) The lower inclined plane is constructed at an angle of 45 degee to the maxillary occlusal plane. Cross bite gets corrected very fast and the appliance should not be kept in place for more than six weeks
If there is an open bite tendency the use of a guide plane is contraindicated.
INCLINED PLANE APPLIANCE (CATALANS APPLIANCE) ADVANTAGES 1. Ease of fabrication 2. Rapidity of correction using functional and muscle forces 3. Lack of soreness or looseness of teeth during movement 4. Rarity of relapse. DISADVANTAGES 1 Strong limitation on diet during the wearing of the appliance 2 Creation of a temporary speech defect 3 Tendency to create an anterior open bite if the appliance is left in place too long. 4 Possibility of the appliance becoming loose and requiring recementation because of the strong occlusal stresses upon it. 5 Imperfect alignment of the malposed tooth when the appliance is removed.The dentist must rely on autonomous adjustment for the balance of correction
CORRECTION OF ANTERIOR CROSS BITE HAWLEY RETAINER WITH AUXILLARY SPRINGS The most frequently used appliance for minor anterior crossbite treatment. Acrylic palatal coverage and wire clasps The auxilliary spring or Double cantilever springs activated to exert labial forces on and move the maxillary incisors.
CORRECTION OF ANTERIOR CROSS BITE HAWLEY RETAINER WITH AUXILLARY SPRINGS
The acrylic can be extended to create posterior bite plates to reduce the overbite and raise the bite.
CORRECTION OF ANTERIOR CROSS BITE
APEX SPRING APLLIANCE
CORRECTION OF ANTERIOR CROSS BITE FACE MASK OR FACE MASK ALONG WITH RME Anterior cross bite due to an actual skeletal deficiency of the maxilla can be corrected using a protraction facemask (reverse headgear). If the maxilla is narrow a Rapid Maxillary Expansion screw can be Used to aid in the transverse Expansion of the maxilla
CORRECTION OF ANTERIOR CROSS BITE
CHIN CUP APPLIANCE Anterior cross bite due to a prominent mandible can be corrected using a chin cup appliance. Chin cup appliance redirect the growth of the mandible, and tends to rotate the mandible backward and downward.
CORRECTION OF ANTERIOR CROSS BITE
FRANKEL III APPLIANCE Designed to activate muscle function to guide anterior growth of the maxilla (Stretches the soft tissue envelop around the maxilla stimulating its anterior growth) Redirect growth of the mandible posteriorly. Must be worn at least 14 hours/day Effectiveness in controversy Not the ideal choice for treatment of skeletal class III.
CORRECTION OF ANTERIOR CROSS BITE
SCREW APPLIANCES Acrylic appliances incorporating various size screws can be used to correct either individual tooth or segmental cross bites.MICRO SCREWS, MINI SCREWS OR MEDIUM SCREWS can be used for the purpose.
CORRECTION OF ANTERIOR CROSS BITE
FIXED APPLIANCE Fixed appliance can deliver slow light continuous forces to correct single tooth or segmental anterior teeth cross bite at practically any age.
CORRECTION OF POSTERIOR CROSS BITE
CORRECTION OF POSTERIOR CROSS BITE
COFFIN SPRING In1875 Coffin found the coffin spring
Capable of correcting cross bite in young developing dentition. Appliance is removable and usually well tolerated. Expansion produced is slow. Disadvantage is that frequent activation is needed.
CORRECTION OF POSTERIOR CROSS BITE
SCREW APPLIANCES Various types of screws can be used to correct single tooth or segmental posterior tooth cross bites
CORRECTION OF POSTERIOR CROSS BITE NITI PALATAL EXPANDER These are nickel titanium wire shapes which are attached to ligual sheath that are welded to molar bands cemented to maxillary first permanent molars.
Apply light continuous pressure on the mid palatal suture. Self activated Requires no adjustments
CORRECTION OF POSTERIOR CROSS BITE QUAD HELIX In1947 Rickets introduced the quad helix Fixed Quad helix is soldered to molar bands cemented on first permanent maxillary molars. Reactivation using three pong pliers is done without removing the appliance. The appliance produce slow expansion in adolescent and adult patients and skeletal effects in preadolescents. Forces generated can be increased or decreased depending upon the amount of activation.
CORRECTION OF POSTERIOR CROSS BITE W-ARCH APPLIANCE Use to correct the bilateral constriction in primary dentition. Made of steel wire soldered to molar bands. The lingual wire should the teeth involved in cross bite & extend not more than 1-2mm distal to banded molars to eliminate soft tissue irritation. Lingual wire should remain 1-1.5 mm away from marginal gingival & the palatal tissue. Accelerates the rate of normal expansion of the mid palatal suture in a young child. The appliance delivers proper forces levels when opened 3-4 mm wider than ive width & should be adjusted to this dimension before being inserted.
CORRECTION OF POSTERIOR CROSS BITE FIXED RAPID PALATAL EXPANSION(RPE) Rapid palatal expansion appliance can be used to correct posterior cross bite by expanding the arch bilaterally by opening the mid palatal suture. Opening of the midpalatal suture is possible until about age 16 or 17 before the maxillary sutures fuse After fusion, the suture may be opened with a surgical assist and a fixed rapid palatal expander (RPE)
CORRECTION OF POSTERIOR CROSS BITE RAPID PALATAL EXPANDER is of HYRAX TYPE and HAAS TYPE
More flexible than Haas expander.This again is of two types BANDED and BONDED
More tissue irritation. Haas expander uses acrylic pads and heavy lingual wires to apply pressure to both the teeth and the palatal tissue
CORRECTION OF POSTERIOR CROSS BITE
FIXED ORTHODONTIC APPLIANCES Can be used for correction of posterior cross bite. CROSS ELASTICS can be used to bring about correction of individual tooth cross bites in the posterior segment.
THANKYOU
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