Patent Publication Number: US-2022226079-A1

Title: One-piece dental implant

Description:
FIELD 
     The disclosure relates to a one-piece dental implant. 
     BACKGROUND 
     Generally, dental implants can be roughly divided into two-piece dental implants and one-piece dental implants. A conventional two-piece dental implant includes a dental implant body and an abutment. The dental implant body and the abutment are separated. After the dental implant body is implanted, the abutment is mounted on the dental implant body. A conventional one-piece dental implant includes a dental implant body and an abutment that are integrally formed. After an artificial dental implantation operation is completed by using the one-piece dental implant, the abutment of the one-piece dental implant is exposed above the gingiva of a patient, and after a predetermined time for osseointegration, a prosthesis is mounted. Therefore, the conventional one-piece dental implant has advantages of a simple structure, good structural strength, and so on. 
     However, because different patients have different alveolar bones, when the conventional one-piece dental implant is implanted in the alveolar bone and the abutment is exposed above the gingiva, it is difficult for a dentist to control a mounting angle of the abutment. Further, because the mounting angle of the abutment cannot be modified and adjusted, the mounting quality and stability of the prosthesis are reduced easily when the prosthesis is subsequently mounted. Moreover, when the mounting angle of the abutment is deviated, interference is caused correspondingly in an occlusion process of the patient, resulting in discomfort and poor occlusion of the patient. Therefore, it is necessary to improve the conventional one-piece dental implant. 
     SUMMARY OF THE INVENTION 
     In accordance with one aspect of the present disclosure, a one-piece dental implant includes a first portion and a second portion. The first portion has a central axis, a bony portion, and a gingival portion. The bony portion is connected to the gingival portion. An outer diameter of the gingival portion is smaller than a maximum outer diameter of the bony portion. The second portion has a connection portion and a trimming portion. 
     The connection portion is connected to the gingival portion of the first portion corresponding to the central axis L. The trimming portion is connected to the connection portion. A cross-sectional area of the trimming portion is larger than a cross-sectional area of the gingival portion of the first portion in a direction perpendicular to the central axis L. The trimming portion has a plurality of side surfaces and a clamping portion. The at least one side surface of the trimming portion is asymmetric with other side surfaces, and the side surface gradually expanding upward. The cross-sectional area of the trimming portion asymmetrically and gradually increases upward. The clamping portion is disposed on an upper portion of the trimming portion. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Aspects of the present disclosure are understood from the following detailed description when read with the accompanying figures. It is emphasized that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. 
         FIG. 1  is a front view of a one-piece dental implant according to an embodiment of the present invention. 
         FIG. 2  is a front view of a one-piece dental implant implanted into a periodontium of a patient according to an embodiment of the present invention. 
         FIG. 3  is a partial cross-sectional view of a one-piece dental implant after a part of a trimming portion is shaved according to an embodiment of the present invention. 
         FIG. 4  is a partial cross-sectional view of a one-piece dental implant after a prosthesis is mounted according to an embodiment of the present invention. 
         FIG. 5  is a top view of a first embodiment of a second portion of a one-piece dental implant according to the present invention. 
         FIG. 6  is a top view of a second embodiment of a second portion of a one-piece dental implant according to the present invention. 
         FIG. 7  is a top view of a third embodiment of a second portion of a one-piece dental implant according to the present invention. 
         FIG. 8  is a top view of a fourth embodiment of a second portion of a one-piece dental implant according to the present invention. 
         FIG. 9  is a partial cross-sectional view of a one-piece dental implant after a part of a trimming portion is shaved (by using the second portion of  FIG. 7 ) according to an embodiment of the present invention. 
         FIG. 10  is a front view of a one-piece dental implant according to an embodiment of the present invention. 
         FIG. 11  is a front view of a one-piece dental implant according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     It is to be understood that the following disclosure provides many different embodiments or examples, for implementing different features of various embodiments. Specific examples of components and arrangements are described below to simplify the present disclosure. The present disclosure may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; 
     rather, these embodiments are provided so that this description will be thorough and complete, and will fully convey the present disclosure to those of ordinary skill in the art. It will be apparent, however, that one or more embodiments may be practiced without these specific details. 
     In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. 
     It will be understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. 
     It will be understood that singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms; such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
       FIG. 1  is a front view of a one-piece dental implant according to an embodiment of the present invention.  FIG. 2  is a front view of a one-piece dental implant implanted into a periodontium of a patient according to an embodiment of the present invention. Referring to  FIG. 1  and  FIG. 2 , in an embodiment, a one-piece dental implant  1  in the present invention includes a first portion  10  and a second portion  20 . The first portion  10  is locked inside a periodontium P of a patient, and the second portion  20  is exposed outside the periodontium P. The periodontium P has a gingival P 1  and an alveolar bone P 2 . In the following description, a side of the periodontium P away from the tongue of the patient is defined as a “buccal side S 1 ” and a side close to the tongue of the patient is defined as a “lingual side S 2 ”. The term “upper” in this specification means being away from the alveolar bone of the patient and the term “lower” in this specification means being opposite to “upper”. The term “distal side” in this specification refers to a direction away from a center line or the front of a body; the term “mesial side” in this specification refers to a direction close to the center line or the front of the body. 
       FIG. 3  is a partial cross-sectional view of a one-piece dental implant after a part of a trimming portion is shaved according to an embodiment of the present invention.  FIG. 4  is a partial cross-sectional view of a one-piece dental implant after a prosthesis is mounted according to an embodiment of the present invention. Referring to  FIG. 2  to  FIG. 4 , in an embodiment, the first portion  10  includes a central axis L, an bony portion  101 , and a gingival portion  13 , and the bony portion  101  is connected to the gingival portion  13 . The second portion  20  includes a connection portion  21  and a trimming portion  22 . The connection portion  21  is connected to the gingival portion  13  of the first portion  10  corresponding to the central axis L, and the trimming portion  22  is connected to the connection portion  21 . In addition, the cross-sectional area of the trimming portion  22  is larger than the cross-sectional area of the gingival portion  13  of the first portion  10  in a direction perpendicular to the central axis L 1 . The trimming portion  22  includes at least one side surface  25  and a clamping portion  27 . The at least one side surface  25  of the trimming portion  22  gradually expands upward, so that the cross-sectional area of the trimming portion  22  gradually increases upward, and the clamping portion  27  is disposed on an upper portion of the trimming portion  22 . In this way, structure design of the trimming portion  22  may be used to shave or grind a part of the trimming portion  22  by using a tool, so that the trimming portion  22  after shaving and the connection portion  21  may jointly form an abutment  23  (as shown in FIG. 
       3 ), and the abutment  23  allows a prosthesis  24  to be mounted (as shown in  FIG. 4 ). 
     Referring to  FIG. 1  and  FIG. 2 , in an embodiment, the first portion  10  includes a relatively free end  10   a  and a connecting end  10   b  , and the connection portion  21  of the second portion  20  is connected to the connecting end  10   b  . A locking portion  11 , a guide portion  12 , and the gingival portion  13  are arranged on the first portion  10  in sequence from the free end  10   a  to the connecting end  10   b  , that is, the bony portion  101  includes the locking portion  11  and the guide portion  12 , which are set in the bone of the patient. An outer diameter of the guide portion  12  gradually decreases from the locking portion  11  to the gingival portion  13 , and an outer diameter of the gingival portion  13  is smaller than the maximum outer diameter of the bony portion  101  and smaller than or equal to the outer diameter of the guide portion  12 . In this way, when the one-piece dental implant  1  is implanted in the periodontium P, because the guide portion  12  has no screw thread, force and damage can be reduced; and because the outer diameter of the guide portion  12  is gradually smaller than an outer diameter of the locking portion  11 , more bones can be accommodated around the guide portion  12 , making the bone around the guide portion  12  thicker. In addition, the gingival portion  13  having a relatively small outer diameter is located on the gingiva P 1  of the periodontium to accommodate more keratinized gingivae, which achieves better protection and can effectively reduce inflammation around the one-piece dental implant  1 . 
     In an embodiment, the locking portion  11  of the first portion  10  is an external screw thread  111 . In this way, the external screw thread  111  of the locking portion  11  allows the one-piece dental implant  1  to be locked into the alveolar bone P 2  of the patient more easily and effortlessly. In addition, a notch  112  may be provided on an outer peripheral surface of the locking portion  11  of the first portion  10 , and the notch  112  extends from the free end  10   a  to the connecting end  10   b  in an axial direction of the central axis L. In this way, the notch  112  is used for discharging excess bone debris through the notch  112  in a process of implanting the one-piece dental implant  1  of the present invention into the alveolar bone P 2  of the patient, and then the notch can resist a rotation force of the dental implant to ensure that the one-piece dental implant  1  is tightly combined with the alveolar bone P 2 . 
     Referring to  FIG. 2 , in an embodiment, the at least one side surface  25  of the trimming portion  22  gradually expands upward, so that the cross-sectional area of the trimming portion  22  gradually increases upward, that is, the trimming portion  22  of the second portion  20  is adjacent to an outer peripheral surface of the connection portion  21  to form an oblique cone side surface, and the oblique cone side surface gradually expands and extends upward, so that the cross-sectional area of the trimming portion  22  gradually increases. In an embodiment, the trimming portion  22  has a plurality of side surfaces, and the plurality of side surfaces symmetrically and gradually expand upward, so that the cross-sectional area of the trimming portion  22  symmetrically and gradually increases upward, that is, the cross-sectional area of the trimming portion  22  symmetrically and gradually increases upward in an average manner In an embodiment, the clamping portion  27  of the trimming portion  22  of the second portion  20  is disposed on an outer edge of the upper portion of the trimming portion  22  of the second portion  20 . The clamping portion  27  is connected to the side surface  25  and corresponds to the central axis L. The clamping portion  27  has a cut surface in the same direction as the central axis L. The at least one cut surface of the clamping portion  27  is disposed on an outer side surface of the upper portion of the trimming portion  22 , to allow a clamping apparatus to clamp and fix, rotate and lock or screw out the one-piece dental implant  1 , so as to facilitate a dental implantation operation. The clamping portion  27  has a length of about 1.0 mm, and does not need to be excessively long; if the length exceeds 2.5 mm, an angle of the side surface  25  is excessively small for the same height, which requires more grinding in the future and is not conducive to clinical operation. 
     Based on the foregoing structure design, several embodiments are further listed in detail below to illustrate various structure types of the second portion  20  of the one-piece dental implant  1  of the present invention, but the present invention is not limited to the embodiments listed below. 
       FIG. 5  is a top view of a first embodiment of a second portion of a one-piece dental implant according to the present invention.  FIG. 6  is a top view of a second embodiment of a second portion of a one-piece dental implant according to the present invention.  FIG. 7  is a top view of a third embodiment of a second portion of a one-piece dental implant according to the present invention.  FIG. 8  is a top view of a fourth embodiment of a second portion of a one-piece dental implant according to the present invention. Referring to  FIG. 5  to  FIG. 8 , in the embodiments, the one-piece dental implant  1  has a first reference plane D 1  and a second reference plane D 2  that radially pass through the central axis L. The first reference plane D 1  and the second reference plane D 2  are perpendicular to each other, so as to divide the trimming portion  22  of the second portion  20  into a first block  22   a  , a second block  22   b  , a third block  22   c  , and a fourth block  22   d  . The first block  22   a  , the second block  22   b  , the third block  22   c  , and the fourth block  22   d  may have the same shape and be symmetrical with each other, or may have different shapes and be asymmetrical with each other, and the present invention is not limited, so as to improve the manufacturing convenience of the one-piece dental implant  1  and provide more diversified functions. 
     Referring to  FIG. 1  and  FIG. 5 , in the first embodiment, a shape of the first block  22   a  of the trimming portion  22  is the same as and symmetrical with a shape of the second block  22   b  of the trimming portion  22 , the shape of the second block  22   b  of the trimming portion  22  is the same as and symmetrical with a shape of the third block  22   c  of the trimming portion  22 , the shape of the third block  22   c  of the trimming portion  22  is the same as and symmetrical with a shape of the fourth block  22   d  of the trimming portion  22 , and the shape of the fourth block  22   d  of the trimming portion  22  is the same as and symmetrical with the shape of the first block  22   a  of the trimming portion  22 . In a direction perpendicular to the central axis L 1 , the first block  22   a  and the second block  22   b  have a first radial width W 1 , and the first block  22   a  and the fourth block  22   d  have a second radial width W 2 . The first radial width W 1  is equal to the second radial width W 2 . In this way, an overall shape of the trimming portion  22  is complete and symmetrical, thereby having more margins for shaving and grinding; moreover, implantation directivity does not need to be considered when the one-piece dental implant is implanted. In an embodiment, four side surfaces of the trimming portion  22  symmetrically and gradually expand upward, so that the cross-sectional area of the trimming portion symmetrically and gradually increases upward. In an embodiment, the first block  22   a  , the second block  22   b  , the third block  22   c  , and the fourth block  22   d  may be each provided with an arc surface C at a corner position away from the central axis LI. In this way, by using an arc angle modification design of the arc surface C, the discomfort caused by the second portion  20  in the mouth of the patient can be effectively alleviated after the dental implantation operation. 
     Referring to  FIG. 1  and  FIG. 6 , in the second embodiment, a shape of the first block  22   a  of the trimming portion  22  is the same as and symmetrical with a shape of the second block  22   b  of the trimming portion  22 , the shape of the second block  22   b  of the trimming portion  22  is the same as and symmetrical with a shape of the third block  22   c  of the trimming portion  22 , the shape of the third block  22   c  of the trimming portion  22  is the same as and symmetrical with a shape of the fourth block  22   d  of the trimming portion  22 , and the shape of the fourth block  22   d  of the trimming portion  22  is the same as and symmetrical with the shape of the first block  22   a  of the trimming portion  22 . In a direction perpendicular to the central axis L 1 , the first block  22   a  and the second block  22   b  have a first radial width W 1 , and the first block  22   a  and the fourth block  22   d  have a second radial width W 2 . The first radial width W 1  is smaller than the second radial width W 2 . In addition, a junction position of the first block  22   a  and the second block  22   b  is provided with an arc surface, a junction position of the third block  22   c  and the fourth block  22   d  is provided with an arc surface C, and the arc surfaces C are far away from the central axis L 1 . In addition, a side at which the first block  22   a  and the fourth block  22   d  are connected is aligned with an extended imaginary outer diameter circle (as shown by the dashed line) of the gingival portion  13  of the first portion  10 ; and a side at which the second block  22   b  and the third block  22   c  are connected is aligned with an extended imaginary outer diameter circle (shown by the dashed line) of the gingival portion  13  of the first portion  10 , that is, when the one-piece dental implant  1  of this embodiment is manufactured, the trimming portion  22  is allowed to have two opposite sides that are relatively narrow. In this way, the two opposite sides that are relatively narrow of the trimming portion  22  can be used to reduce a shaved and ground volume of the trimming portion  22  in the future. However, when the one-piece dental implant is implanted, the implantation directivity needs to be considered. For example, a direction of the second radial width W 2  is a direction of “buccal side S 1 ” and “lingual side S 2 ”. In an embodiment, two side surfaces of the trimming portion  22  symmetrically and gradually expand upward, so that the cross-sectional area of the trimming portion symmetrically and gradually increases upward in a direction of the two side surfaces. 
     Referring to  FIG. 1  and  FIG. 7 , in the third embodiment, a shape of the first block  22   a  of the trimming portion  22  is the same as and symmetrical with a shape of the second block  22   b  of the trimming portion  22 , the shape of the second block  22   b  of the trimming portion  22  is different from and asymmetrical with a shape of the third block  22   c  of the trimming portion  22 , the shape of the third block  22   c  of the trimming portion  22  is the same as and symmetrical with a shape of the fourth block  22   d  of the trimming portion  22 , and the shape of the fourth block  22   d  of the trimming portion  22  is different from and asymmetrical with the shape of the first block  22   a  of the trimming portion  22 . In a direction perpendicular to the central axis L 1 , the first block  22   a  and the second block  22   b  have a first radial width W 1 , and the first block  22   a  and the fourth block  22   d  have a second radial width W 2 . The first radial width W 1  is greater than the second radial width W 2 . In addition, a side at which the first block  22   a  and the second block  22   b  are connected is aligned with an extended imaginary outer diameter circle (as shown by the dashed line) of the gingival portion  13  of the first portion  10 , that is, when the one-piece dental implant  1  of this embodiment is manufactured, the trimming portion  22  is allowed to have one side that is relatively narrow to reduce a shaved and ground volume of the trimming portion  22  in the future. In this embodiment, the third block  22   c  and the fourth block  22   d  of the trimming portion  22  deviate from the central axis L 1 , to adapt to directions of alveolar bones of different patients. In addition, a groove  26  may be formed on opposite outer sides of the first block  22   a  and the fourth block  22   d  of the trimming portion  22 , and a groove  26  may be formed on opposite outer sides of the second block  22   b  and the third block  22   c  of the upper portion of the trimming portion  22 . The grooves  26  are arranged on the clamping portion  27 , so that the grooves  26  coordinate with the clamping apparatus to clamp and fix, rotate and lock or screw out the one-piece dental implant  1 , so as to facilitate a dental implantation operation. In an embodiment, the clamping portion  27  has at least one groove  26  or cut surface in the same direction as the central axis L 1 . In an embodiment, a junction position of the third block  22   c  and the fourth block  22   d  may be provided with an arc surface C, and the arc surface C is far away from the central axis L 1 . In an embodiment, one side surface of the trimming portion  22  is asymmetric with other side surfaces, and the side surface gradually expands upward, so that the cross-sectional area of the trimming portion asymmetrically and gradually increases upward. Therefore, the shaved and ground volume of the trimming portion  22  may be reduced in the future. 
     Referring to  FIG. 1  and  FIG. 8 , in the fourth embodiment, the shapes of the first block  22   a  , the second block  22   b  , the third block  22   c  , and the fourth block  22   d  of the trimming portion  22  are all different and asymmetric. In a direction perpendicular to the central axis L 1 , the first block  22   a  and the second block  22   b  have a first radial width W 1 , and the first block  22   a  and the fourth block  22   d  have a second radial width W 2 . The first radial width W 1  is equal to the second radial width W 2 . In addition, a side at which the first block  22   a  and the fourth block  22   d  are connected is aligned with an extended imaginary outer diameter circle (as shown by the dashed line) of the gingival portion  13  of the first portion  10 ; and a side at which the first block  22   a  and the second block  22   b  are connected is aligned with an extended imaginary outer diameter circle (shown by the dashed line) of the gingival portion  13  of the first portion  10 . In this embodiment, the third block  22   c  of the trimming portion  22  may slightly deviate from the central axis L 1 , to adapt to directions of alveolar bones of different patients and rotate to a suitable angle according to the direction of the alveolar bone of the patient. In addition, a junction position of the second block  22   b  , the third block  22   c  and the fourth block  22   d  may be provided with an arc surface C, and the arc surface C is far away from the central axis L 1 . In an embodiment, one side surface of the trimming portion  22  is asymmetric with other side surfaces, and the side surface gradually expands upward, so that the cross-sectional area of the trimming portion asymmetrically and gradually increases upward. 
     Therefore, the shaved and ground volume of the trimming portion  22  may be reduced in the future. 
       FIG. 9  is a partial cross-sectional view of a one-piece dental implant after a part of a trimming portion is shaved (by using the second portion of  FIG. 7 ) according to an embodiment of the present invention. 
     Referring to  FIG. 3  and  FIG. 9 , the trimming portion  22  of the second portion  20  of  FIG. 5  is used in  FIG. 3 , and the trimming portion  22  of the second portion  20  of  FIG. 7  is used in  FIG. 9 . Therefore, compared with  FIG. 3 , when the one-piece dental implant  1  in  FIG. 9  is manufactured, the trimming portion  22  is allowed to have one side that is relatively narrow, which generally can reduce irritation to the buccal side after implantation and reduce shaving volume for later abutment preparation. 
       FIG. 10  is a front view of a one-piece dental implant according to an embodiment of the present invention. Referring to  FIG. 10 , different from the embodiment of  FIG. 1 , the outer diameter of the gingival portion  13  of the first portion  10  is equal to the outer diameter of the guide portion  12 . In addition, in an embodiment, the trimming portion  22  of the second portion  20  of the embodiment of  FIG. 10  does not include the clamping portion  27  of the cut surface in the same direction with the central axis L 1  in the embodiment of  FIG. 1 . The trimming portion  22  of the second portion  20  of the embodiment of  FIG. 10  includes a clamping portion  28  disposed on an upper portion of the second portion  20 . Corresponding to the central axis L, the clamping portion  28  includes a relatively upright groove, the at least one groove of the clamping portion  28  is arranged inside the upper portion of the trimming portion  22 , and the at least one groove extends downward from a top surface  29  of the trimming portion to form an inner groove, to allow a clamping apparatus in a corresponding shape to extend into the groove to clamp and fix, rotate and lock or screw out the one-piece dental implant  1 , so as to facilitate a dental implantation operation. Because the size of the groove of the clamping portion  28  may be fixed, such a design allows implants of different specifications to use the same clamping apparatus. In addition, because the at least one groove of the clamping portion  28  is arranged inside the upper portion of the trimming portion  22 , and an action of the clamping apparatus extending into the groove does not increase an operation radius or an operation range, which is clinically less interfered by an adjacent tooth. 
       FIG. 11  is a front view of a one-piece dental implant according to an embodiment of the present invention. Referring to  FIG. 11 , different from the embodiment of  FIG. 10 , the trimming portion  22  of the second portion  20  of the embodiment of  FIG. 11  has a clamping portion  28  disposed on the upper portion of the second portion  20 , and the clamping portion  28  is not connected to the side surface  25 , that is, the cross-sectional area of the clamping portion  28  is smaller than the largest cross-sectional area of the side surface  25 . Corresponding to the central axis L, the clamping portion  28  includes a relatively upright area or a cut surface, to allow a clamping apparatus to clamp and fix, rotate and lock or screw out the one-piece dental implant  1 , so as to facilitate a dental implantation operation. Because the size of the clamping portion  28  may be fixed, such a design allows implants of different specifications to use the same clamping apparatus. 
     Referring to  FIG. 3  and  FIG. 4 , in the foregoing embodiment, when the one-piece dental implant  1  of the present invention is applied to the dental implantation operation, the first portion  10  can lock the gingiva 
     P 1  and the alveolar bone P 2  of the patient, to achieve a fastening function. When the alveolar bone of the patient is deflected on the “buccal side S 1 ” or “lingual side S 2 ”, the dentist can implant the one-piece dental implant  1  of the present invention according to a direction of the deflected alveolar bone of the patient. As shown in  FIG. 3 , the one-piece dental implant  1  is implanted obliquely toward a direction of the “lingual side S 2 ”. In other words, deflection angles of the alveolar bone on the “buccal side S 1 ” or “lingual side S 2 ” are different according to different patients. The dentist can only control an angle of a mesial side and a distal side but cannot change the deflection angle of the alveolar bone on the “buccal side S 1 ” or “lingual side S 2 ”. After implantation, the second portion  20  (shown by the dashed line) is relatively located outside the periodontium P of the patient. After the dental implantation operation is completed and a predetermined time is used for osseointegration, the one-piece dental implant body  1  can be tightly combined with the periodontium P of the patient. After the osseointegration, for different patients, the dentist can perform a shaving or grinding operation in the direction of clinical situation, such as the direction of the “buccal side S 1 ”, the “lingual side S 2 ”, the “mesial side”, or the “distal side” by using a tool in coordination with the structure design that the trimming portion  22  is allowed to be shaved, so as to form the abutment  23  in a suitable size at a suitable angle. 
     The conventional abutment has an angle of 6 to 8 degrees, and the conventional abutment needs a longer size to achieve a good retention force to set up a prosthesis. However, the conventional longer abutment causes interference during an osseointegration period, that is, a chance of being bitten by the patient increases, reducing a success rate of the conventional dental implantation. Because the abutment  23  of the one-piece dental implant  1  of the present invention can be ground to close to 0 degrees, the abutment  23  only needs to have length of about 4 mm to achieve a good retention force for the prosthesis. Therefore, by using a shorter second portion  20 , the present invention can reduce the interference during the osseointegration period after dental implantation, thereby improving the success rate of dental implantation. 
     Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, and composition of matter, means, methods and steps described in the specification. As those skilled in the art will readily appreciate form the present disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized in accordance with some embodiments of the present disclosure. 
     Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, and compositions of matter, means, methods or steps. In addition, each claim constitutes a separate embodiment, and the combination of various claims and embodiments are within the scope of the invention.