Patent Publication Number: US-2013236847-A1

Title: Self-ligation orthodontic bracket

Description:
BACKGROUND 
     1. Field of the Invention 
     The present invention relates to a self-ligation orthodontic bracket, and more particularly, to a self-ligation orthodontic bracket in which the number of components is minimized, manufacturing cost is reduced, the number of working processes is reduced so that the whole product price can be lowered, and a phenomenon that food gets stuck is minimized so that an injury of the teeth and discoloration of the bracket can be prevented and product competitiveness can be strengthened. 
     2. Discussion of Related Art 
     In general, a state in which the teeth are crooked and a set of teeth is not even is referred to as “malocclusion” in dental medicine terms, and treatment for correcting malocclusion is referred to as remedial treatment. 
     When the teeth or a set of teeth is in the state of malocclusion, there are many obstacles that the appearance is ugly distorted, it is difficult to chew, wind goes through the teeth and pronunciation becomes unclear. 
     Thus, a variety of orthodontic methods for correcting irregularities have been developed and used so as to remove the obstacles. 
     There is an orthodontic method using a bracket among various orthodontic methods according to the related art. 
     Referring to  FIG. 1 , an orthodontic apparatus that is used in the orthodontic method using a bracket according to the related art includes a bracket  10  that are formed on wings  11  and constitute an insertion groove  12  configured of an inclination surface  13  with a radiation angle of 15° to 25° so that vertical insertion wires, an archwire  20 , a binder  30 , and a wedge  40  can be additionally used, the archwire  20  inserted into the insertion groove  12  of the bracket  10 , the binder  30  inserted into the insertion groove  12  so as to fix the archwire  20 , and the wedge  40 . 
     However, in such a bracket according to the related art, an additional connection wire is required to fix a plurality of brackets and an archwire to each other, and a portion that protrudes to the outside of the bracket after the connection wire is installed, is not smooth. 
     Also, it is inconvenient to perform a connection work using the connection wire so as to fix the archwire to the brackets, and it takes a long time to do a connection work. 
     Also, since the connection wire is a steel wire, the lips or the inner cheek may get stabbed, or the connection wire may come loose. 
     As a way to solve the problems, Korean Patent Prior Registration No. 959151 filed by the present applicant entitled by Self-ligation Orthodontic Apparatus has been suggested, as illustrated in  FIG. 2 . 
     Referring to  FIG. 2 , a self-ligation orthodontic apparatus includes a bracket  110  that includes a head part  111 , of which a bottom surface is attached to the teeth and which protrudes from one side of a top surface, a binding-piece mounting groove  113  formed in a side of the head part  111  in a horizontal direction, an archwire mounting groove  114  formed in a lower side of the binding-piece mounting groove  113 , and an elastic fixing plate insertion hole  117  that is perforated into a lower side of the archwire mounting groove  114  to cross the archwire mounting groove  114 , an elastic fixing plate  120  that is inserted into the elastic fixing plate insertion hole  117 , has a hanging side  122  formed at an end thereof and a cap spring fixing part  121  formed so that a cap spring  130  can be fixed to an end of a curved part  123  curved upward and that is formed of an elastic body, and the cap spring  130  that is fixed to the elastic fixing plate  120 . 
     Thus, when an archwire is inserted into the archwire mounting groove  114  of the bracket  110  and then the elastic fixing plate  120  and the cap spring  130  are coupled to the bracket  110 , working conveniences in which the archwire is fixed, are improved. 
     However, the above Prior Registration Patent filed by the present applicant has the following problems. 
     1. Manufacturing cost is high. 
     Since the orthodontic apparatus includes the bracket  110 , the elastic fixing plate  120 , and the cap spring  130 , they should be individually manufactured so that manufacturing cost increases, and they should be individually assembled so that a working time increases. 
     Also, due to the above problems, the whole product price increases so that product competitiveness is deteriorated. 
     2. Food gets stuck. 
     Since the orthodontic apparatus includes a plurality of components, food gets stuck between coupling gaps between the components. 
     Also, when food got stuck in the orthodontic apparatus is left for a long time, spoilage occurs and causes a chemical reaction with the teeth and thus the teeth may be hurt. 
     Also, as the orthodontic apparatus is discolored due to food spoilage, a user repulses the discolored orthodontic apparatus. 
     3. The lips or an inside of the mouth may be hurt by the orthodontic apparatus. 
     Since the sizes of borders of the bracket, the elastic fixing plate, and the cap spring are the same, the lips or the tongue may be scratched by the orthodontic apparatus due to a chewing action or other actions. 
     4. The cap spring coupled to the bracket cannot be separated from the bracket. 
     The cap spring should be destroyed so as to separate the cap spring from the bracket after an orthodontic operation is completed. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to providing a self-ligation orthodontic bracket in which the number of components is minimized, manufacturing cost is reduced, the number of working processes is reduced so that the whole product price can be lowered, and a phenomenon that food gets stuck is minimized so that an injury of the teeth and discoloration of the bracket can be prevented and product competitiveness can be strengthened. 
     One aspect of the present invention provides a self-ligation orthodontic bracket including: a body including a connection part that is formed at one side of the body and allows an archwire to be inserted and to be supported and an attachable portion that is formed at the other side of the body and is adhered to teeth wherein the connection part includes an insertion groove formed in a horizontal direction based on an installation state of the bracket and having a predetermined depth at which the archwire is inserted into the insertion groove, a plurality of fixing protrusions formed at an upper part of the insertion groove and having a fixing groove formed in one side of each of the plurality of fixing protrusions, a plurality of supporting protrusions formed at a lower part of the insertion groove and spaced apart from each other by a predetermined distance, guide protrusions formed between the plurality of supporting protrusions and protruding to a predetermined height, and a hooking space that is formed in a downward direction of the insertion groove and is penetrated in a direction in which a center of the body crosses the insertion groove; and a cap spring including an elastic fixing part that is formed at one side of the cap spring and an elastic hanging part that is formed at the other side of the cap spring, wherein a bent portion is formed at an end of the elastic fixing part and is bent to an outer side of the elastic fixing part at a predetermined angle, when both ends of the elastic fixing part are supported and enter between the supporting protrusions of the body, the elastic fixing part is guided to outer surfaces of the guide protrusions, the bent portion of the elastic fixing part is inserted into the fixing groove, and the elastic hanging part is inserted into the hooking space of the body and is ligated to the body. 
     The body may further include a hanging groove formed in one side of the hooking space and having a predetermined depth, and the cap spring may further include a hanging protrusion formed at one side of the elastic hanging part and having a predetermined height at which the hanging protrusion is inserted into the hanging groove of the body when the elastic hanging part is ligated to the body. 
     A tool insertion hole may be formed in one side of the elastic fixing part of the cap spring and may allow part of a tool used when the cap spring is detached from the body to be inserted into the tool insertion hole and may allow the cap spring to be easily detached from the body. 
     An accommodation space that is recessed to a predetermined depth so that a predetermined amount of an adhesive is accommodated in the accommodation space when the adhesive is applied to the attachable portion, may be formed in the attachable portion of the body, a center part may be formed in the accommodation space, and peripheral parts having a larger depth than the center part may be formed on a periphery of the center part. 
     A plurality of protrusions may be formed in the accommodation space, and as the plurality of protrusions have heights that are the same as or slightly less than a surface of the attachable portion and no adhesive accommodated in the accommodation space is applied to the attachable portion, the plurality of protrusions may allow the body to be easily detached from the teeth as air permeates into portions where no adhesive is applied, when a tool is shaken so as to remove the body from the teeth after an orthodontic operation is completed. 
     The accommodation space may be divided into three parts, that is, a center part and peripheral parts formed at both sides of the center part based on the body adhered to the teeth. 
     Another aspect of the present invention provides a self-ligation orthodontic bracket including: a body including a connection part that is formed at one side of the body and allows an archwire to be inserted and to be supported and an attachable portion that is formed at the other side of the body and is adhered to teeth, wherein the connection part includes an insertion groove formed in a horizontal direction based on an installation state of the bracket and having a predetermined depth at which the archwire is inserted into the insertion groove, a plurality of fixing protrusions formed at an upper part of the insertion groove and having a fixing groove formed in one side of each of the plurality of fixing protrusions, hanging protrusion parts that protrude between the plurality of fixing protrusions and are formed close to the fixing protrusions so that the center of the body passes through the hanging protrusion parts, a plurality of supporting protrusions formed at a lower part of the insertion groove and spaced apart from each other by a predetermined distance, guide protrusions formed between the plurality of supporting protrusions and protruding to a predetermined height, and a hooking space that is formed in a downward direction of the insertion groove and is penetrated in a direction in which a center of the body crosses the insertion groove; and a cap spring including an elastic fixing part that is formed at one side of the cap spring and an elastic hanging part that is formed at the other side of the cap spring, wherein a bent portion is formed at an end of the elastic fixing part and is bent to an outer side of the elastic fixing part at a predetermined angle, a fitting groove is formed through one side of the elastic fixing part, when both ends of the elastic fixing part are supported and enter between the supporting protrusions of the body, the elastic fixing part is guided to outer surfaces of the guide protrusions, the bent portion of the elastic fixing part is inserted into the fixing groove, the elastic hanging part is inserted into the hooking space of the body and is ligated to the body, and both ends of the fitting groove are fitted to and fixed to the hanging protrusion parts. 
     The body may further include a hanging groove formed in one side of the hooking space and having a predetermined depth, and the cap spring may further include a hanging protrusion formed at one side of the elastic hanging part and having a predetermined height at which the hanging protrusion is inserted into the hanging groove of the body when the elastic hanging part is ligated to the body. 
     A tool insertion hole may be formed in a side of the fitting groove of the cap spring and may allow part of a tool used when the cap spring is detached from the body to be inserted into the tool insertion hole and may allow the cap spring to be easily detached from the body. 
     An accommodation space that is recessed to a predetermined depth so that a predetermined amount of an adhesive is accommodated in the accommodation space when the adhesive is applied to the attachable portion, may be formed in the attachable portion of the body, and a center part may be formed in the accommodation space, and peripheral parts having a larger depth than the center part may be formed on a periphery of the center part. 
     A plurality of protrusions may be formed in the accommodation space, and as the plurality of protrusions have heights that are the same as or slightly less than a surface of the attachable portion and no adhesive accommodated in the accommodation space is applied to the attachable portion, the plurality of protrusions may allow the body to be easily detached from the teeth as air permeates into portions where no adhesive is applied, when a tool is shaken so as to remove the body from the teeth after an orthodontic operation is completed. 
     The accommodation space may be divided into three parts, that is, a center part and peripheral parts formed at both sides of the center part based on the body adhered to the teeth. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail example embodiments thereof with reference to the attached drawings, in which: 
         FIG. 1  is an exploded perspective view of a bracket according to the related art. 
         FIG. 2  is an exploded perspective view of another bracket according to the related art. 
         FIG. 3  is an exploded perspective view of a bracket according to an embodiment of the present invention. 
         FIG. 4  is a bottom view of a body according to an embodiment of the present invention. 
         FIG. 5  is a cross-sectional view illustrating a state in which the body is attached to the teeth, according to an embodiment of the present invention. 
         FIGS. 6A through 6E  are views illustrating a state in which the body and a cap spring are coupled to each other or are detached from each other, according to an embodiment of the present invention. 
         FIG. 7  is a view illustrating a state in which the cap spring is detached from the body, according to an embodiment of the present invention. 
         FIG. 8  is a view illustrating a state in which the body is detached from the teeth, according to an embodiment of the present invention. 
         FIG. 9  is an exploded perspective view of a bracket according to another embodiment of the present invention. 
         FIG. 10  is a plan view illustrating a state in which a cap spring is coupled to a body, according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS 
     First Embodiment 
     Hereinafter, an exemplary embodiment of the present invention will be described in detail. 
       FIG. 3  is an exploded perspective view of a bracket according to an embodiment of the present invention,  FIG. 4  is a bottom view of a body according to an embodiment of the present invention, and  FIG. 5  is a cross-sectional view illustrating a state in which the body is attached to the teeth, according to an embodiment of the present invention. The following descriptions will be provided with reference to the above drawings. 
     A bracket  200  according to the present invention includes a body  210  and a cap spring  220 . 
     The body  210  includes a connection part  2110  that is formed at one side of the body  210 , has an insertion groove  2111  into which an archwire  20  is inserted and allows the archwire  20  to be fixed due to the cap spring  220  ligated to the body  210 , and an attachable portion  2120  that is formed at the other side of the body  210  and is adhered to and fixed to the surface of the teeth. 
     The connection part  2110  and the attachable portion  2120  of the body  210  are formed integrally with each other. Since the size of a border of the connection part  2110  is relatively smaller than the size of the attachment  2120 , an injury of the lips or an inside of the mouth may be minimized. 
     The insertion groove  2111  is formed in the connection part  2110  of the body  210 , crosses the center of the body  210  in a horizontal direction based on the installation state of the body  210 , and has a predetermined depth at which the archwire  20  is inserted into the insertion groove  2111 . 
     The connection part  2110  includes a plurality of fixing protrusions  2112  formed at an upper part of the insertion groove  2111  and a plurality of supporting protrusions  2114  formed at a lower part of the insertion groove  2111 . 
     A fixing groove  2113  having a predetermined depth is formed in each of the fixing protrusions  2112 , and one end of the cap spring  220  is inserted into the fixing groove  2113 . 
     Each of the supporting protrusions  2114  is a unit that supports the cap spring  220  when one end of the cap spring  220  is inserted into each of the fixing protrusions  2112 . 
     A plurality of supporting protrusions  2114  are provided with regular intervals so as to support both ends of the cap spring  220 , and a support groove  2115 , in which one end of the cap spring  220  is hung, is formed in the end of the supporting protrusions  2114 . 
     Guide protrusions  2116  are formed between the plurality of supporting protrusions  2114  and guide smooth insertion when one end of the cap spring  220  is inserted into the fixing groove  2113 . 
     The guide protrusions  2116  are adjacent to the insertion groove  2111 . 
     A detachment groove  2117  that allows entrance and exit of a tool when the cap spring  220  is detached from the body  210 , may be formed in the guide protrusions  2116 . 
     Of course, the detachment groove  2117  may be omitted depending on the shape of the tool and a detachment method. 
     A hooking space  2118  is formed in the connection part  2110  and is provided in a direction in which the center of the body  210  crosses the insertion groove  2111 , in a downward direction of the insertion groove  2111 , and one end of the cap spring  220  is inserted in the hooking space  2118 . 
     A hanging groove  2119  in which one end of the cap spring  220  is hung is formed in the hooking space  2118 . 
     The hanging groove  2119  is formed to be recessed in one side of an upper inner side of the hooking space  2118  to a predetermined depth. 
     An accommodation space  2122  that is recessed to a predetermined depth so as to improve an adhesive force, is formed in the attachable portion  2120 . 
     The accommodation space  2122  is divided into a center part  2124  formed in the center of the accommodation space  2122  and peripheral parts  2126  formed on the periphery of the center part  2124 . 
     The accommodation space  2122  may be divided into three parts, i.e., the center part  2124  and the peripheral parts  2126  formed at both sides of the center part  2124  based on the body  210  attached to the teeth. 
     Furthermore, the center part  2124  and the peripheral parts  2126  have different recess depths. 
     In this case, the recess depth of each of the peripheral parts  2126  is larger than the recess depth of the center part  2124 . 
     The reason why the center part  2124  and the peripheral parts  2126  have different recess depths, as described above, is that the accommodation amount of an adhesive applied to the peripheral parts  2126  is larger than that of the adhesive applied to the center part  2124  so that the adhesion strength of the body  210  in the peripheral parts  2126  is higher than in the center part  2124 . 
     Also, a plurality of protrusions  2128  that protrude from the accommodation space  2122  so as to have the same surface as the surface of the attachable portion  2120  may be formed in the accommodation space  2122 . The height of the plurality of protrusions  2128  is not limited thereto, and the plurality of protrusions  2128  may be higher than the center part  2124 . 
     The cap spring  220  is a unit that is ligated to the body  210  and fixes the archwire  20  inserted into the insertion groove  2111  of the body  210 . 
     The cap spring  220  includes an elastic fixing part  222  that is formed at one end of the cap spring  220  and is hung in and fixed to the fixing groove  2113  of the body  210 , an elastic hanging part  224  that is formed at the other end of the cap spring  220  and is inserted in the hooking space  2118  of the body  210 , and a connector  226  that connects the elastic fixing part  222  and the elastic hanging part  224 . 
     The cap spring  220  may be formed of a material having an elastic force and a corresponding shape thereto. 
     In this case, the material of the cap spring  220  may be formed of a synthetic resin or metal, and the shape of the cap spring  220  may be an overall ‘C’-shape and more preferably, may perform the function of an elastic body. 
     A bent portion  223  that is bent to an outer side of the elastic fixing part  222  at a predetermined angle so that a force applied to the bent portion  223  against the fixing groove  2113  can be amplified, is formed on the elastic fixing part  222 . The bent portion  223  has a bent shape that is the same as or similar to the supporting protrusions  2114  and the support groove  2115  of the body  210 . 
     A tool insertion hole  228  is formed in one side of the elastic fixing part  222  or the connector  226 , allows part of a tool used when the cap spring  220  is detached from the body  210  to be inserted into the tool insertion hole  228  and allows the cap spring  220  to be easily detached from the body  210 . 
     A hanging protrusion  225  that is hung in the hanging groove  2119  formed in the hooking space  2118  of the body  210 , is formed at one side of the elastic hanging part  224 . 
     In this case, since the length of the elastic hanging part  224  is larger than the length of the elastic fixing part  222 , when the cap spring  220  is coupled to the body  210 , first, the elastic hanging part  224  is inserted in the hooking space  2118  of the body  210  so that stable ligation of the cap spring  220  can be performed. 
     That is, the cap spring  220  is configured in such a way that the elastic fixing part  222  having the bent portion  223  formed at an end of the elastic fixing part  222  is formed while the cap spring  220  is divided into both sides so that both sides can be supported by both-end supporting protrusions  2114  of the body  210 , the tool insertion groove  228  is formed in the center of the cap spring  220  that is connected from the elastic fixing part  222  to the connector  226  so that the cap spring  220  can be ‘C’-shaped, and the elastic hanging part  224  is formed so that the hanging protrusion  225  protrudes from the end of the connector  226  and the elastic hanging part  224  has a size at which the elastic hanging part  224  can be inserted in the hooking space  2118 . 
     An operating state of the self-ligation orthodontic bracket having the above configuration according to the first embodiment of the present invention will now be described as follows. 
     As illustrated in  FIG. 5 , in a state in which the body  210  is attached to the surface of the teeth, an adhesive is applied to the attachable portion  2120  of the body  210 , i.e., the accommodation space  2122 . 
     In this case, the adhesive is applied in such a way that a larger amount of the adhesive than the adhesive applied to the center part  2124  is applied to the peripheral parts  2126 . 
     The body  210  is attached to and fixed to the surface of the teeth as a procedure target. 
     Subsequently, the archwire  20  is inserted into the insertion groove  2111  of the body  210  so as to correct irregularities, and the cap spring  220  is ligated to the body  210  so as to fix the archwire  20 . 
     A state in which the cap spring  220  is coupled to the body  210  will now be described as below. 
       FIG. 6A  illustrates a state before the cap spring  220  is ligated to the body  210 . In this case, the body  210  is attached to the surface of the teeth, as described above. 
       FIG. 6B  illustrates a state in which the cap spring  220  is first ligated to the body  210  attached to the surface of the teeth. The elastic hanging part  224  of the cap spring  220  is inserted in the hooking space  2118  of the body  210 , and the elastic fixing part  222  of the cap spring  220  is first hung in the supporting protrusions  2114  and the support groove  2115  of the body  210 . 
     That is, the support groove  2115  and the bent portion  223  of the elastic fixing part  222  have the same or similar shapes and thus they are stably mounted on the supporting protrusions  2114 , and the hanging protrusion  225  of the elastic hanging part  224  of the cap spring  220  is hung in the hanging groove  2119  of the hooking space  2118 , and as such, first ligation of the cap spring  220  to the body  210  is performed. 
     In this case, since both ends of the elastic fixing part  222  of the cap spring  220  are mounted on both-end supporting protrusions  2114  of the body  210 , the elastic fixing part  222  is not interfered by the guide protrusions  2116  provided between the supporting protrusions  2114 . 
     Of course, since a space between the elastic fixing part  222  and the elastic hanging part  224  of the cap spring  220  is in a compressed state in which a space between the supporting protrusion  2114  and the hooking space  2118  are tightened, due to an elastic action, the cap spring  220  is not randomly detached from the body  210 . 
     Meanwhile, as described above, an operation of attaching the body  210  to the surface of the teeth in a state in which the cap spring  220  is first ligated to the body  210  or an operation of inserting the archwire  20  into the body  210  to which the cap spring  220  is first ligated may be performed. 
       FIG. 6C  illustrates an operation of pushing the first-ligated cap spring  220  into the body  210 . 
     If the first-ligated cap spring  220  is further pushed into the body  210 , the bent portion  223  of the elastic fixing part  222  of the cap spring  220  climbs over the support groove  2115  of the supporting protrusions  2114 , and the connector  226  positioned in the rear of the elastic fixing part  222  is positioned on top surfaces of the guide protrusions  2116  provided between the supporting protrusions  2114 . 
     Furthermore, the guide protrusions  2116  are positioned higher than the supporting protrusions  2114 , as illustrated in  FIG. 6C , and thus widen a distance between the elastic fixing part  222  and the elastic hanging part  224  of the cap spring  220 . 
     In this case, a maximum widening force is applied to the elastic fixing part  222  by the guide protrusions  2116 , and due to this action, the elastic hanging part  224  that is elastically connected to the elastic fixing part  222  is temporarily widened so that hanging regulation of the hanging protrusion  225  of the elastic hanging part  224  hung in the hanging groove  2119  of the hooking space  2118  of the boy  210  is temporarily released. 
     This action is useful in detaching the cap spring  220  from the body  210 . If the hanging protrusion  225  is ligated to or detached from the body  210  and the hanging protrusion  225  is still hung in the hanging groove  2119 , a ligation or detachment operation is interfered by the hung state and thus may not be easily performed, and the problem that the hanging protrusion  225  may be damaged and its function may be lost, may occur depending on an occasion. 
       FIG. 6D  illustrates a state in which insertion of the cap spring  220  into the body  210  is completed. 
     That is, the cap spring  220  is pushed into the body  210  until outer circumferential surfaces of the guide protrusions  2116  of the body  210  and an inner circumferential surface of the connector  226  of the cap spring  220  are closely adhered to each other. 
     In this case, the elastic fixing part  222  that is widened to the maximum by the guide protrusions  2116  is narrowed due to an elastic restoring force, and the bent portion  223  is inserted into the fixing groove  2113  formed in the fixing protrusions  2112 . 
     In this case, the connector  226  of the cap spring  220  that is closely adhered to the body  210  is ‘C’-shaped and thus is not widened by the guide protrusions  2116 . 
       FIG. 6E  illustrates a state in which the cap spring  220  is finally ligated to the body  210 . 
     The elastic fixing part  222  and the elastic hanging part  224  of the cap spring  220  that is fully closely adhered to the body  210  are narrowed due to the elastic restoring force, as illustrated in  FIG. 6E . 
       FIG. 7  is a view illustrating a state in which the cap spring  220  is detached from the body  210 , according to an embodiment of the present invention, and  FIG. 8  is a view illustrating a state in which the body  210  is detached from the teeth, according to an embodiment of the present invention. A state in which the bracket is detached from the teeth will now be described with reference to the above drawings. 
     First, when the cap spring  220  is detached from the body  210 , part of the tool is inserted into the tool insertion groove  228  of the cap spring  220  and then is pulled in a detachment direction, the elastic fixing part  222  and the elastic hanging part  224  of the cap spring  220  are forcibly detached from the fixing groove  2113  and the hooking space  2118  of the body  210  due to the pulling force so that the cap spring  220  can be separated from the body  210 . 
     Then, the archwire  20  is removed from the insertion groove  2111  of the body  210  from which the cap spring  220  is separated. 
     Referring to  FIG. 8 , both sides of the body  210  fixed to the teeth are shaken in a state in which one end of the body  210  is grasped using a tool such as a flier. 
     In this case, both sides of the body  210  that are bitten by the tool are more shaken, and a center of the body  210  is relatively less shaken. 
     Thus, the peripheral parts  2126  of the attachable portion  2120  are first detached from the teeth. 
     Also, the center part  2124  having a relatively smaller applied amount of the adhesive than the peripheral parts  2126  may be detached from the teeth even when it is relatively less shaken than force applied to shake the peripheral parts  2126 . 
     That is, an attachment surface is a flat surface according to the related art and thus the attachable portion has the same adhesion strength in its positions. When the body is removed from the teeth, even though both ends of the body are first detached from the teeth, the body is still maintained while its center is attached to the teeth. Thus, more force should be applied during a removal operation so as to detach the body from the teeth. 
     In this case, the center of the body is detached from the teeth, and simultaneously, an enamel layer of the teeth is together detached so that a secondary problem that may cause an injury of the teeth occurs. 
     Meanwhile, since a plurality of protrusions  118  having the same surfaces as the surface of the attachment surface  110  are formed in the accommodation space  112 , i.e., on the center part  114  and the peripheral parts  116 , no adhesive is applied to the protrusions  118 , or even when the adhesive is applied to the protrusions  118 , an adhesive force is minute. Thus, when the body  210  is removed from the teeth, as illustrated in  FIG. 8 , force that causes the body  210  to be shaken by the tool is applied to the periphery of the protrusions  2128  in the same manner so that the body  210  can be easily detached from the teeth with a small force. 
     Second Embodiment 
       FIG. 9  is an exploded perspective view of a bracket according to another embodiment of the present invention, and  FIG. 10  is a plan view illustrating a state in which a cap spring  220  is coupled to a body  210 ′, according to another embodiment of the present invention. 
     The second embodiment of the present invention is different from the first embodiment in that fixing protrusions  2112  and hanging protrusion parts  2112 ′ of the body  210 ′ are formed. Other elements than the fixing protrusions  2112  and the hanging protrusion parts  2112 ′ of the body  210 ′ are the same as those of the first embodiment described with reference to  FIGS. 3 through 8 . 
     Hereinafter, like reference numerals are used for like elements as those of the first embodiment, and detailed descriptions thereof will be omitted. 
     The body  210 ′ includes the hanging protrusion parts  2112 ′ that protrude between the fixing protrusions  2112  and are formed close to the fixing protrusions  2112  so that the center of the body  210 ′ passes through the hanging protrusion parts  2112 ′. 
     The hanging protrusion parts  2112 ′ of the body  210 ′ closely support both ends of a fitting groove  227  of a cap spring  220  so that the cap spring  220  can be prevented from moving in right and left directions. 
     The hanging protrusion parts  2112 ′ of the body  210 ′ have a hanging structure in which both ends of the fitting groove  227  of the cap spring  220  are hung in the hanging protrusion parts  2112 ′ and are fixed thereto. 
     The cap spring  220  is a unit that is ligated to the body  210 ′ and fixes an archwire  20  inserted into an insertion groove  2111  of the body  210 ′. 
     The cap spring  220  includes an elastic fixing part  222  that is formed at one end of the cap spring  220  and is hung in and fixed to a fixing groove  2115  of the body  210 ′, an elastic hanging part  224  that is formed at the other end of the cap spring  220  and is inserted in a hooking space  2118  of the body  210 ′, the fitting groove  227 , of which both ends are fitted to and fixed to the hanging protrusion parts  2112 ′, and a connector  226  that connects the elastic fixing part  222  and the elastic hanging part  224 . 
     Since both ends of the fitting groove  227  formed in the elastic fixing part  222  are hung in, fitted to, and fixed to the hanging protrusion parts  2112 ′ of the body  210 ′, the cap spring  220  is prevented from moving in right and left directions and is firmly fixed. 
     An operating state of a self-ligation orthodontic bracket having the above configuration according to the second embodiment of the present invention will now be described as below. 
     A bent portion  223  of the cap spring  220  is inserted into and fixed to the fixing groove  2113  of the body  210 ′ and simultaneously, both ends of the fitting groove  227  formed in the elastic fixing part  222  of the cap spring  220  are hung in and fitted to the hanging protrusion parts  2112 ′ of the body  210 ′. 
     In this case, since the fitting groove  227  of the cap spring  220  is fitted to and fixed to the hanging protrusion parts  2112 ′ of the body  210 ′, a fixing force of the cap spring  220  is strong, and the cap spring  220  is prevented from moving in right and left directions. 
     While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. 
     As described above, as a bracket including a body and a cap spring is provided, the number of components is minimized, manufacturing cost is reduced, the number of working processes is reduced so that the whole product price can be lowered, and a phenomenon that food gets stuck is minimized so that an injury of the teeth and discoloration of the bracket can be prevented and product competitiveness can be strengthened.