a crown bridge surgical operation method , which is one of dental prosthesis treatment methods generally used for restoring a damaged tooth is a surgical operation method of fixing an artificial tooth between healthy teeth by covering a cap formed at both sides of the artificial tooth at a healthy tooth positioned at both sides of the damaged tooth and has a problem that healthy teeth should be removed by a thickness of a cap so as to cover the cap at the healthy teeth positioned at both sides of the artificial tooth . in order to solve the problem , the present inventor invented an invention of document 1 formed with an artificial tooth inserted into a tooth extraction portion so as to easily perform a bridge surgical operation without damage of healthy teeth , a bridge that close contacts with and is fixed to a rear surface of teeth of both sides of the tooth extraction portion and that inserts and fixes the artificial tooth to the front side , and a coupling member that couples the artificial tooth and the bridge . however , the invention of document 1 has a defect having blade portions at both sides of an artificial tooth in order to prevent the artificial tooth from being pushed to the rear side , thereby injuring an aesthetic external appearance of teeth after a surgical operation . further , in a state in which an artificial tooth and a bridge are coupled , as a coupling member has a screw fastening structure , the invention of document 1 has a defect that it is inconvenient to perform a surgical operation in a narrow mouth . the present invention has been made in view of the above problems , and provides a non - removable bridge dental prosthesis that can be securely fixed without removal of any tooth of a tooth extraction portion and that can easily perform a surgical operation through a structure in which both sides of an artificial tooth and both sides of the front side of a coupling member are formed to have an area larger than space formed by teeth of both sides of the tooth extraction portion and in which the coupling member integrally formed with the artificial tooth is inserted and fixed from the front side to the rear side of a bridge . in accordance with an aspect of the present invention , there is a non - removable bridge dental prosthesis formed with an artificial tooth inserted into a tooth extraction portion ; a bridge that close contacts with and is fixed to a rear surface of teeth of both sides of the tooth extraction portion and in which the artificial tooth is inserted and fixed to the front side ; and a coupling member that couples the artificial tooth and the bridge , wherein at a rear surface of the artificial tooth , the coupling member is integrally installed , in an upper portion and an intermediate portion of the coupling member , a coupling protrusion and a latch piece inclined by a predetermined angle downward are protruded , in the bridge , at a position corresponding to a position in which the coupling protrusion of the coupling member is formed , a coupling hole is formed in a shape corresponding to the coupling protrusion , and by inserting the coupling member integrally installed in the artificial tooth into a tooth extraction portion in a diagonal direction , while the coupling protrusion is inserted into the coupling hole of the bridge fixed to the teeth of both sides of the tooth extraction portion , the latch piece is latched to an upper end portion of the bridge and thus the artificial tooth is securely fixed to the tooth extraction portion . according to the present invention , as a non - removable bridge dental prosthesis is securely fixed to a tooth extraction portion when masticating food without removal of a tooth adjacent to the tooth extraction portion , a removal ratio of dental prosthesis is minimized , there is no exposed portion other than an artificial tooth and thus an aesthetic external appearance is provided , a coupling member is integrally installed with the artificial tooth , and thus a surgical operation can be conveniently performed without causing discomfort to a surgical operator and a patient . fig1 is an exploded perspective view illustrating a non - removable bridge dental prosthesis according to a first exemplary embodiment of the present invention . fig2 is a perspective view illustrating a coupling state of fig1 . fig3 is an exploded cross - sectional view illustrating a first exemplary embodiment of the present invention . fig4 is a cross - sectional view illustrating a coupling state of fig3 . fig5 is a horizontal cross - sectional view illustrating a coupling state of fig3 . fig7 is an exploded perspective view illustrating a non - removable bridge dental prosthesis according to a second exemplary embodiment of the present invention . fig8 is an exploded cross - sectional view illustrating a second exemplary embodiment of the present invention . fig9 is a cross - sectional view illustrating a coupling state of fig8 . fig1 is a horizontal cross - sectional view illustrating a coupling state of a second exemplary embodiment of the present invention . hereinafter , an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings . a non - removable bridge dental prosthesis 100 according to an exemplary embodiment of the present invention is formed with an artificial tooth 1 inserted into a tooth extraction portion ; a bridge 2 that close contacts with and fixed to a rear surface of teeth t of both sides of the tooth extraction portion and in which the artificial tooth 1 is inserted and fixed to the front side ; and a coupling member that couples the artificial tooth 1 and the bridge 2 . at a rear surface of the artificial tooth 1 , a coupling member is integrally installed , in an upper portion and an intermediate portion of the coupling member , a latch piece 3 and a coupling protrusion 4 inclined by a predetermined angle downward are protruded , and the bridge 2 has a coupling hole 5 formed in a shape corresponding to the coupling protrusion 4 at a position corresponding to a position in which the coupling protrusion 4 of the coupling member is formed . in an end portion of the coupling protrusion 4 , an adhesion groove 6 of a predetermined depth is formed , at the inside of the coupling hole 5 , in a state in which the coupling protrusion 4 is inserted into the coupling hole 5 , at a position corresponding to the adhesion groove 6 , a coupling groove 5 a is formed , and a distance between the rear side of the coupling hole 5 and the coupling groove 5 a is larger than an inner diameter of the front side of the coupling hole 5 and is formed smaller than an inner diameter of the coupling groove 5 a . both sides of the artificial tooth 1 and both sides of the front side of the coupling member are formed larger than space in which the teeth t of both sides of the tooth extraction portion are formed . at both sides of the bridge 2 , in a portion contacting with a rear surface of the teeth t of both sides of the tooth extraction portion , the same curved surface 7 as the rear surface of the teeth t is formed , and a support cover 8 that can cover a marginal ridge and a non - functional cusp of the teeth t is formed . here , a marginal ridge indicates teeth corner portion of a portion in which a tooth and a tooth contact in an adjacent teeth set . a non - removable bridge dental prosthesis according to the present invention formed in this way is operated to enable a patient not to feel discomfort due to a damaged tooth in daily life by fixing the artificial tooth 1 to a tooth extraction portion of the damaged tooth . particularly , a non - removable bridge dental prosthesis according to the present invention is characterized in that when a mouth is opened , only the artificial tooth 1 is exposed to the outside and thus an aesthetic external appearance is provided , and as a coupling member installed in the artificial tooth 1 is inserted into the bridge 2 and is coupled to the bridge 2 , a surgical operation is conveniently performed , and even if a force is applied to the front side and the rear side of the artificial tooth 1 , a fixed state of the artificial tooth 1 is securely maintained . as shown in fig1 and 2 , while the artificial tooth 1 having a front surface larger than a width of space formed by the teeth t of both sides of the tooth extraction portion are formed is obliquely inserted into the coupling hole 5 of the bridge 2 by the coupling protrusion 4 of the coupling member installed at a rear surface of the artificial tooth 1 , the latch piece 3 is latched and fixed to an upper end portion of the bridge 2 , and the binder b is injected into the rear side of the coupling hole 5 and thus the coupling protrusion 4 is adhered and fixed . that is , as shown in fig3 and 4 , when inserting and fixing a coupling member installed at a rear surface of the artificial tooth 1 to the bridge 2 , a portion of the bridge 2 positioned between an upper end portion of the bridge 2 and the coupling hole 5 is inserted into space formed between the latch piece 3 of the coupling member and the coupling protrusion 4 to perform a function of a support . therefore , as the coupling member is obliquely coupled to the bridge 2 from an upper portion to a lower portion , a surgical operation is simpler than that of a conventional case through a structure in which the coupling member is inserted and fixed the coupling member and that can easily bear a force and a rotation occurring in the artificial tooth 1 when tearing food further than a structure in which the coupling member is horizontally coupled to the bridge 2 from the front side to the rear side . further , as shown in fig5 and 6 , both sides of the artificial tooth 1 and both sides of the front side of the coupling member are formed larger than space formed by the teeth t positioned at both sides of the tooth extraction portion , and this is to prevent the artificial tooth 1 from being pushed to the rear side using the teeth t positioned at both sides of the tooth extraction portion as a support when chewing food or when an impact is applied from the outside . accordingly , even if the artificial tooth 1 is exposed , in order to prevent that the artificial tooth 1 is pushed to the rear side like a conventional case , because a blade portion installed at both sides of the artificial tooth 1 does not exist , other portions of the non - removable bridge dental prosthesis 100 other than the artificial tooth 1 are not exposed and thus an aesthetic external appearance is provided , and the non - removable bridge dental prosthesis is securely fixed by teeth of both sides of the tooth extraction portion t . as shown in fig3 and 4 , in an end portion of the coupling protrusion 4 , the adhesion groove 6 of a predetermined depth is formed , and at the inside of the coupling hole 5 , in a state in which the coupling protrusion is inserted into the coupling hole 5 , at a position corresponding to the adhesion groove 6 , the coupling groove 5 a is formed , and a distance between the rear side of the coupling hole 5 and the coupling groove 5 a is larger than an inner diameter of the front side of the coupling hole 5 and is formed smaller than an inner diameter of the coupling groove 5 a , and thus the artificial tooth 1 is securely fixed to the bridge 2 through the binder b . that is , when a binder b is injected into the rear side of the coupling hole 5 and fills the adhesion groove 6 and the coupling hole 5 to be solidified , even if a force of a front direction is applied to the artificial tooth 1 , the binder b is latched to the adhesion groove 6 and the coupling groove 5 a to support the artificial tooth 1 . further , as the front side of the solidified binder b is formed larger than space between the rear aide of the coupling protrusion 4 and the rear aide of the coupling hole 5 , the binder b is prevented from being withdrawn to the rear side due to an impact and thus the artificial tooth 1 can be securely fixed to the bridge 2 . as shown in fig1 , in the bridge 2 , the curved surface 7 and a support cover 8 are formed to be securely fixed to the teeth t positioned at both sides of the tooth extraction portion as well as the coupling hole 5 formed in the tooth extraction portion . this is to secure a fixing area for fixing the bridge 2 to the maximum through the curved surface 7 and the support cover 8 so as to securely fix the bridge 2 to the teeth t in consideration of an engagement relationship of an upper jaw and a lower jaw and a structure of teeth . further , by applying a binder at the curved surface 7 of the bridge 2 and an inner side surface of the support cover 8 , by securely adhering and fixing to the teeth t positioned at both sides of the tooth extraction portion , the artificial tooth 1 is securely fixed against a force or a rotation occurring when masticating food . a first exemplary embodiment of the present invention formed in this way has a structure to be applied to teeth used for tearing food , such as a front tooth and a canine tooth , and by changing the first exemplary embodiment , a second exemplary embodiment of the present invention to be applied to a premolar and a molar may be formed . in this case , in a second exemplary embodiment shown in fig7 to 10 , in a configuration of a first exemplary embodiment , a support piece 9 horizontally protruded in an upper portion of the coupling member and having a lower surface formed in a curved shape is formed instead of a latch piece 3 , and a coupling protrusion 4 is protruded in the same shape as a curved surface of a lower surface of the support piece 9 . therefore , the artificial tooth 1 of a premolar or molar form coupled to a bridge 2 through a coupling member of the second exemplary embodiment can easily support a force operating to the front side and a compression force occurring in a vertical direction . that is , similar to the first exemplary embodiment , the coupling member of the artificial tooth 1 is latched to the bridge 2 inserted between the support piece 9 and the coupling protrusion 4 to support a force operating to the front side , and the support piece 9 is horizontally formed similar to a structure in which an upper surface of a premolar and a molar are widely formed to easily bear a force of a vertical direction operating to an upper surface of the artificial tooth 1 . in a surgical operation of a second exemplary embodiment , similar to the first exemplary embodiment , the bridge 2 is adhered and fixed by a binder to a rear surface of the teeth t positioned at both sides of the tooth extraction portion , and by inserting the coupling protrusion 4 of a coupling member integrally installed in the artificial tooth 1 in a diagonal direction into a coupling hole 5 of the bridge 2 positioned at the tooth extraction portion , an end portion of the coupling protrusion 4 protruded to a rear surface of the bridge 2 is adhered and fixed by a binder b . in this way , a non - removable bridge dental prosthesis 100 according to an exemplary embodiment of the present invention is securely fixed to a tooth extraction portion when masticating food without removing a tooth t adjacent to a tooth extraction portion and thus a separation ratio of the non - removable bridge dental prosthesis 100 is minimized and there is no exposed portion other than the artificial tooth 1 and thus an aesthetic external appearance is provided , and as the coupling member is integrally installed in the artificial tooth 1 , a surgical operator and a patient can conveniently have a surgical operation without discomfort .