Abstract
A dental prosthesis (1) with an angled inner bore (2) is proposed, formed by a first hole (7) and a second hole (26) connected by an angled connection area (29) formed with an angle between 0 and 180. An outer area (31) and side areas (32) of the angled connection area (29) form an elbow (40) devoid of protruding edges directed towards the interior of the inner bore (2). Said elbow (40) facilitates the insertion and extraction of a screw through the inner bore (2) during the assembly or disassembly of the dental prosthesis (1) on a dental implant. Some methods of manufacturing said dental prosthesis (1) are also proposed.
Claims
1. Dental prosthesis (1), intended to be connected directly or indirectly to a dental implant, wherein said dental prosthesis (1) comprises an inner bore (2) formed by a first hole (7) and a second hole (26) connected by an angled connection area (29) formed with an angle between 0 and 180, characterized in that an outer area (31) and side areas (32) of the angled connection area (29) form an elbow (40) devoid of edges that protrude towards the interior of the inner bore (2).
2. Dental prosthesis (1), according to claim 1, characterized in that the first hole (7) and the second hole (26) are connected to each other by side surfaces (44) tangent to said holes (7, 26).
3. Dental prosthesis (1), according to claim 1, characterized in that the first hole (7) comprises an outer end (17) arranged at a first end (4) of the dental prosthesis (1) and a widened area (18) arranged following the outer end (17) and having a larger diameter than the outer end (17).
4. Dental prosthesis (1), according to claim 1, characterized in that the outer area (31) is rounded.
5. Dental prosthesis (1), according to claim 1, characterized in that the dental prosthesis is obtained by an additive manufacturing process.
6. Method of manufacturing a dental prosthesis (1), intended to be connected directly or indirectly to a dental implant, wherein said dental prosthesis includes an angled inner through bore (2), characterized in that it comprises the steps of: a) obtaining a main body (3) of a dental prosthesis (1), wherein said main body (3) is provided with a first end (4) intended to be oriented towards a dental implant and a second end (5) opposite to said first end (4); b) drilling a first hole (7) in said first end (4) in a first direction (8); c) milling and widening an intermediate area (15) of said first hole (7), thus obtaining a widened area (18); d) drilling a second hole (26) in said second end (5) in a second direction (27) that forms an angle other than zero with the first direction (8), with said second hole (26) extending to the first hole (7); and e) laterally milling and widening an inner end (16) of the first hole (7) that protrudes from the second hole (26) to form an elbow (40).
7. Method according to claim 6, characterized in that said step of drilling a first hole (7) is carried out with a drill bit (10) having a cutting tip (11).
8. Method according to claim 7, characterized in that said drill bit (10) has entirely non-cutting side walls (12).
9. Method according to claim 6, characterized in that said step of milling and widening an intermediate area (15) of said first hole (7) is carried out with a burr (20) having cutting side walls (21) and a non-cutting distal end (22).
10. Method according to claim 9, characterized in that the burr (20) comprises a shaft (23) and a head (24), wherein said head (24) extends from said shaft (23) and omprises said cutting side walls (21) and a said non-cutting distal end (22).
11. Method according to claim 10, characterized in that said widened area (18) is cylindrical.
12. Method according to claim 6, characterized in that said step of drilling a second hole (26) is carried out with a tool (35) having a cutting tip (36).
13. Method according to claim 12, characterized in that said tool (35) further comprises cutting side walls (37) adjacent to said cutting tip (36).
14. Method according to claim 6, characterized in that, in said step of drilling a second hole (26), the second hole (26) extends to the widened area (18) of the first hole (7).
15. Method according to claim 6, characterized in that said step of milling and widening an inner end (16) of the first hole (7) is carried out with a burr (45) having a cutting tip (46).
16. Method according to claim 15, characterized in that one or more edges (42) present on said inner end (16) of the first hole (7) are smoothed in said step of laterally milling and widening an inner end (16) of the first hole (7).
17. Method according to claim 15, characterized in that said cutting tip (46) has a resultant spherical or ellipsoidal outer cutting surface (47).
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Details of the invention can be seen in the accompanying drawings, which do not seek to restrict the scope of the invention:
[0014] FIG. 1 shows a cross-sectional front elevation view of a dental prosthesis at the beginning of execution of an example of a manufacturing method according to the invention.
[0015] FIG. 2 shows a cross-sectional front elevation view illustrating a first step of the method.
[0016] FIG. 3 shows a cross-sectional front elevation view of the dental prosthesis, once the step in the previous figure has been executed.
[0017] FIG. 4 shows a cross-sectional front elevation view illustrating a second step of the method.
[0018] FIG. 5 shows a cross-sectional front elevation view of the dental prosthesis, once the step in the previous figure has been executed.
[0019] FIG. 6 shows a cross-sectional front elevation view illustrating a third step of the method.
[0020] FIG. 7 shows a cross-sectional front elevation view of the dental prosthesis, once the step in the previous figure has been executed.
[0021] FIG. 8 shows a cross-sectional front elevation view illustrating a fourth step of the method.
[0022] FIG. 9 shows a cross-sectional front elevation view of the dental prosthesis, once the step in the previous figure has been executed.
[0023] FIG. 10 shows a cross-sectional view of the dental prosthesis in FIG. 7, according to section plane A-A.
[0024] FIG. 11 shows a cross-sectional view of the dental prosthesis in FIG. 9, according to section plane B-B.
DETAILED DESCRIPTION OF THE INVENTION
[0025] The invention proposes a dental prosthesis with an angled channel or inner bore intended to receive a screw in order to fix said dental prosthesis to a dental implant or to intermediate part(s) that are in turn connected to a dental implant. Methods of manufacturing said dental prosthesis are also proposed.
[0026] An example of a dental prosthesis (1) obtained according to the invention is shown in FIG. 9. As shown, said dental prosthesis (1) includes an angled inner through bore (2), i.e. an inner bore with a non-rectilinear shape and that extends through the dental prosthesis (1). In turn, FIGS. 1 to 8 show a sequence of steps of a method of manufacturing said dental prosthesis (1) according to the invention.
[0027] Referring initially to FIG. 1, the method starts from a main body (3), from which the final prosthesis (1) will be formed as explained below. The initial main body (3) can be a solid part, as shown in the figure, and is provided with a first end (4) and a second end (5) opposite or approximately opposite said first end (4). The first end (4) is intended to be oriented towards a dental implant, not represented in the figures. In the present embodiment, by way of example, the first end (4) of the main body (3) has a narrower termination or neck (6) intended to be housed in a space or recess of a dental implant or of an intermediate part that in turn is supported by a dental implant. The second end (5), in turn, has an outer profile or contour that imitates a natural tooth.
[0028] As shown in FIG. 2, a first hole (7) is then drilled from said first end (4) and toward the interior of the main body (3). Said first hole (7) is arranged in a first direction (8) intended to coincide with (or be parallel to) the longitudinal central shaft of the dental implant that will support the final dental prosthesis (1) once said dental prosthesis (1) is placed on a dental implant in a patient's mouth.
[0029] As can be seen, the first hole (7) is cylindrical. Drilling is preferably carried out with a drill bit (10) that has a cutting tip (11) and non-cutting side walls (12) along the entire length of the drill bit (10). This means that preferably, only the tip (11) of the drill bit (10) is sharp. In this way, drilling of a first hole (7) which is cylindrical (i.e. has cylindrical side walls) and arranged in the desired direction is achieved with total precision. Said hole (7) is shown, now without the drill bit (10), in FIG. 3.
[0030] Next, as illustrated in FIG. 4, an intermediate area (15) of said first hole (7) that lies between an inner end (16) and an outer end (17) of the first hole (7) is milled and widened laterally. In this way, as can be seen in FIG. 5, which illustrates the result of the milling in FIG. 4, said intermediate area (15) becomes wider than the inner end (16) and the outer end (17) of the first hole (7), i.e. the first hole (7) is provided with an intermediate widened area (18). As shown in FIG. 5, the outer end (17) of the first hole (7) extends along the neck (6) and toward the interior of the main body (3), slightly beyond the neck (6). In turn, the widened area (18) is arranged beyond the neck (6), i.e. in the rest of the main body (3) which is wider than the neck (6). An annular and transversal seating surface (19) is formed in the lower area of the widened area (18), surrounding the inner end (17) of the first hole (7). It is on said seating surface (19) of the widened area (18) where the head of the screw (not shown), intended to tighten and secure the dental prosthesis (1) against the intermediate part or dental implant (not shown) to which the dental prosthesis (1) is fixed, will be supported.
[0031] Preferably, as shown in FIG. 4, this step of milling and widening the intermediate area (15) of the first hole (7) is carried out with a mill bit or burr (20) with cutting side walls (21) and a non-cutting distal end (22). This enables a cylindrical widened area (18) to be formed while eliminating the risk that the tip of the burr (20) might longitudinally mill the first hole (7) beyond the intermediate area (15) in which milling of said widened area (18) is desired. More specifically, as shown in FIG. 4, the burr (20) includes an elongated body or shaft (23), and a head (24), where said head (24) extends from said shaft (23), is wider than the shaft (24) and has the aforementioned cutting side walls (21) and non-cutting distal end (22).
[0032] Next, as shown in FIG. 6, a cylindrical second hole (26) is drilled, from the second end (5) of the main body (3) and toward the first hole (7). The second hole (26) extends in a second direction (27), which is angled in relation to the first direction (8), i.e. forms an angle (28) greater than zero and less than 180 with the first direction (8). As can be observed in FIG. 7, which shows the main body (3) once the second hole (26) has been drilled, said second hole (26) is connected with the first hole (7) and said holes (7, 26) jointly form a through inner channel that extends from the first end (4) to the second end (5) of the main body (3). These communicating holes (7, 26) converge in an angled connection area (29). Said angled connection area (29) has an inner area (30), which is where the angle (28) is formed, an outer area (31) opposite the angle (28), and side areas (32), visible in FIGS. 10 and 11.
[0033] On another hand, the drilling of the second hole (26) is preferably carried out in such a way that the second hole (26) extends to the widened area (18) of the first hole (7). This enables the volume of the angled connection area (29) to be increased while the entrance of the second hole (26), i.e. the opening to the outside of the second hole (26) located at the second end (5) of the main body (3), remains relatively narrow.
[0034] Preferably, as illustrated in FIG. 6, the step of drilling a second hole (26) is carried out with a tool (35) which has a cutting tip (36) and which can also have cutting side walls (37) adjacent to said cutting tip (36). The cutting tip (36) pierces and forms the second hole (26) in a forward direction, i.e. towards the interior of the main body (3) in the second direction (27). In the event that the tool has cutting side walls (37), as shown in the figure, a helical drilling can be performed so that the tool (35) not only drills forward as it advances inside the main body (3) but also widens the walls of the second hole (26) so as to obtain a second hole (26) with a greater diameter than that of the tool (35).
[0035] FIG. 10 shows a cross sectional view of the main body (3) in the situation shown in FIG. 7. In said figure, edges (42, 43) formed respectively at the intersection between the first hole (7) and the second hole (26), and at the intersection between the inner end (16) and the widened area (18) of the first hole (7) can be seen. Said edges (42, 43) protrude towards the interior of the inner bore (2).
[0036] Then, as shown in FIG. 8, the angled connection area (29) between the holes (7, 26) is milled and widened, both at its outer area (31) and laterally. On milling the outer area (31), the edges (42) of the inner end (16) of the first hole are eliminated, as shown in FIG. 11. On milling laterally, the lateral edges (43) between the first hole (7) and the second hole (26) are eliminated, as shown in FIG. 11, for example by lowering the edges (43) until side surfaces (44) tangent to the first hole (7) and the second hole (26) are achieved. An elbow (40) or external and lateral widening, which can be seen more clearly in FIG. 9, is thus formed in the angled connection area (29). Said elbow (40) is devoid of edges protruding towards the inside of the inner bore (2) in the outer area (31) and side areas (32) of the angled connection area (29). In this way, the inner through bore (2) according to the present invention is obtained. The elbow (40) provides an additional space for unobstructedly turning the head of a screw (not shown) that is either inserted through the second hole (26) and rotates in the angled connection area (29) to move towards the first hole (7), or is extracted from the first hole (7) towards the second hole (26).
[0037] Preferably, on milling and widening the inner end (16) of the first hole (7), the edges (42) present on said inner end (16) of the first hole (7) are smoothed. This facilitates the smooth movement of the screw through said angled connection area (29), especially during extraction of the screw.
[0038] As shown in FIG. 8, this step of milling and widening an inner end of the first hole (7) is carried out with a mill bit or burr (45) that has a cutting tip (46). Said cutting tip (46) can be, for example, spherical or ellipsoidal in shape, thereby enabling a continuous smooth milled surface to be obtained.
[0039] Alternative embodiments to that described above are contemplated in order to obtain the dental prosthesis (1) according to the invention. For example, manufacture of said dental prosthesis (1) by an additive manufacturing or three-dimensional (3D) printing process is contemplated.
