WO2020030957A1

WO2020030957A1 - Implant structure mainly for cortical implanting

Info

Publication number: WO2020030957A1
Application number: PCT/IB2018/056024
Authority: WO
Inventors: Gabor BARATH
Original assignee: Barath Gabor
Priority date: 2018-08-10
Filing date: 2018-08-10
Publication date: 2020-02-13

Abstract

The subject of the invention is an implant structure mainly for cortical implanting, comprising a drive head (1) and long neck (2). It is characterized in that a special threaded profile (5) is connected to the neck (2), supporting the joint functioning of the cortical bone (8) and the adhering cancellous bone (9).

Description

Implant structure mainly for cortical implanting

The invention relates to an implant structure mainly for implanting in the cortical, comprising a driver head and a neck.

There are dental implants with long neck and self-tapping threaded structures, implanted directly into the hard cortical bone of the jaw. However, the existing thread-type structures have disadvantages. The drive head is connected through a long neck to the short, threaded part, implanted in the cortical. Due to the strong leverage, the bite force can easily loosen the structure and it will no longer be able to fix the tooth replacement.

Known implants with shorter neck are implanted in the spongiotic cancellous bone adhering to the cortical, and do not reach cortical bone region. The cancellous bone often gets damaged during tooth extraction, therefore most of the implants can not be implanted immediately, but only after regeneration taking several months, in two phases. To reduce the regeneration period, dental professionals apply bone replacement.

The international document number WO2012069178 Al, as one of the previous inventions, explains a solution, where a tapered bore on a conical head fixes the implant in the bone.

The Czech utility model protection document number CZ31297 Ul describes a conical implant with a compression screw that has a short, bendable neck.

EP1839617 Al European patent document presents a smaller profile neck portion with a bending zone, which allows the screw implant to bend along the predetermined bending lines.

The Russian RET2651052 patent document present an implant, made of a ceramic structure to shorten the time of prosthesis by using a biomechanically compatible implant design.

The Swiss document CH695234 A5 describes a system where the compression thread stabilizes the implant during the implanting. The European invention document number EP0320740 A2 introduces a similar thread, however, the screw implant is for a jaw bone.

The Czech utility model protection document number CZ30490 U 1 A gives details of dental self-tapping screw implant with a replacement head for modification of the height.

International Patent Application W02013068088 Al appears to be the closest solution. The document describes an implant comprising of two types of threads, a self-tapping thread and a compression thread, but these two threads are connecting to separate regions. The structure stabilizes itself via the self-cutting screw and facilitates osseointegration around the implant. The common disadvantage of the implants described above is that the dentist can not determine the thickness of the cancellous and cortical bone during the implanting procedure, therefore in advance he cannot estimate precisely whether the threaded part of the implant the will end up also in the harder cortical bone adhering to the cancellous bone closer to the oral cavity. It is important for the professional to be aware of it, in order to choose the implant with the correct thread, and thus fix stably the structure in bone.

The objective of the present invention is to overcome the shortfalls of the existing solutions and to provide a structure that is able to fix the implant in the cortical and the cancellous bone region better, so that it can be loaded already after a week.

The idea of the invention is based on the recognition that if the combination is carried out according to the main claim, then a more advantageous solution will be created.

According to the objective set, the most general embodiment of the invention can be realised as specified in Claim 1. Various invention embodiments are described in the sub claims.

The invention in general relates to an implant structure mainly for implanting in the cortical region, comprising a driver head and a long neck. The feature of the invention is that a special threaded profile is connected to the neck, supporting the joint functioning of the cortical bone and the cancellous bone. The long neck means that the structure can reach the cortical.

A different embodiment is when the threaded section has a conical profile, and the part of the threaded profile near to the neck is the compression part, the farther part is the self-tapping section. Another embodiment can be when a combination section, allowing the joint functioning of the self-tapping and the compression sections, is included between.

According to another solution, the compression section and at least part of the combination section provides a surface supporting the osseointegration.

In one embodiment, the largest diameter of the threaded profile exceeds the largest diameter of the drive head. The length of the neck exceeds the length of the threaded profile.

When applying the invention, the implant can be loaded after a maximum recovery time of two weeks, its position is stable and facilitation of the osseointegration is ensured.

The invention will now be described in more detail with reference to the embodiment example. The attached drawings show the following:

Figure 1 : Side view of the structure, Figure 2: Plan view of the structure,

Figure 3 : Implanting the structure in damaged cancellous bone,

Figure 4: Implanting the structure in thin alveolar ridge,

Figure 5: Implanting the structure in thin alveolar ridge, in a way that the drive head is located both in the cancellous and the second cortical bone at the same time.

Figure 1 shows the drive head 1 with axially engraved 4 grooves every 90 degrees, in order to allow the structure to drive into the bone. The neck 2 is connected to drive head 1 with rounding. The diameters of the long neck 2 are at maximum, with the rounding, in the middle section of neck 2 there is a smaller, slimmer part of it. On the other end of the neck 2, opposite to the drive head 1 there is the threaded profile 5. The threaded profile 5 has a conical shape. The threaded profile 5 comprises the self-tapping section 3, the compression section 4, with the combination section 7 in between, allowing both the self-tapping and the bone compression. The compression section 4 and at least part of the combination section 7 provides a surface supporting the osseointegration 6. The osseointegration 6 surface is rough, thereby supporting the adhesion of the bone and the bone replacement 10 applied.

Figure 2 shows plan view of the drive head 1, with axially engraved four grooves every 90 degrees in axial direction, in other to allow the structure to drive into the bone. In plan view the compression section 4 of the drive head 1 can be seen, as the largest diameter of the previous exceeds the largest diameter of the drive head 1.

In Figure 3, the structure is shown from the side view, already implanted, when the soft cancellous bone 9, adhering to the hard cortical bone 8, due to damaged condition, creates a gap at the site of implanting, exceeding the diameter of the implant. In such case, to replenish the location of the implant, the use of bone replacement 10 is suggested. The figure also shows the neck 2, the self-tapping section 3, the compression section 4, the threaded profile 5, the surface supporting osseointegration 6 and the combination section 7.

Figure 4 shows the side view of the structure when implanted into cancellous bone 9, within the shell of the cortical bone 8 with thin alveolar ridge. It can be seen in the figure that the threaded profile 5 is screwed into the cancellous bone 9 and the drive thread 1 is attached to the long neck 2 extending outside the bone. The figure also shows the self-tapping section 3, the compression section 4, the surface supporting osseointegration 6 and the combination section 7. In Figure 5, in side view, the structure is implanted in the cortical 8 with thin alveolar ridge, so that the threaded profile 5 is screwed both into the cancellous bone 9 and the second cortical bone 8. The figure also shows the drive head 1, the neck 2, the self-tapping section 3, the compression section 4, the surface supporting osseointegration 6, the combination section 7, the cortical bone 8 and the cancellous bone 9.

During the process, two-phase installation becomes unnecessary, since the implant can be directly screwed into the cortical bone 8 and can be stabilized because of thread, without displacement. In case it is necessary, bone replacement material can be applied to replenish the gap after tooth extraction. The structure offers several advantages. The advantage of the invention is that the dentist does not have to decide during the implanting whether to fix the implant in the cancellous or the cortical bone, since the unique threading and geometry of the drive head makes it irrelevant, it can be screwed into both bones, even at the same time. Another advantage is the conical shape of the threaded profile, which accelerates the osseointegration of the soft cancellous bone. Another advantage is that the two-phase implanting becomes unnecessary, as in case of missing cancellous bone it is not required to wait for the osseointegration, the implant can be screwed into the cortical immediately. If the neck is bent, it is easy to incorporate the structure even in the case of a bone structure with difficult access.

The invention may also be implemented within the scope of the protection by other embodiments. An embodiment can be a structure with bent neck. The field of application of the invention is primarily dental, but the structure can be utilized in oral surgery implants.

Claims

1. Implant structure mainly for cortical implanting, comprising a drive head (1) and long neck (2), characterized in that a special threaded profile (5) is connected to the neck (2), supporting the joint functioning of the cortical bone (8) and the adhering cancellous bone (9).

2. The structure according to claim 1, characterized in that the threaded profile (5) has a conical profile, wherein the part of the threaded profile (5) near to the neck has a compression section (4), the farther part has a self-tapping section (3).

3. The structure according to claim 1 or 2, characterized in that there is a combination section (7) in between the self-tapping section (3) and the compression section (4), supporting the joint functioning of the cortical bone (8) and the cancellous bone (9).

4. The structure according to any of claims 1 to 3, characterized in that a surface supporting the osseointegration (6) is provided in the compression section (4) and at least part of the combination section (7).

5. The structure according to any of claims 1 to 4, characterized in that the largest diameter of the threaded profile (5) exceeds the largest diameter of the drive head (1).

6. The structure according to any of claims 1 to 5, characterized in that the length of the neck (2) exceeds the length of the threaded profile (5).