Claims:What we claim is:
1. The present invention 1, defect angle protractor assembly, comprises of four arms:
the said first arm has attached protractor at the upper end, this arm is placed along the side of the root of the teeth in human jaw and measures the depth of the defect;
the said second arm has the provision of movement that occurs at the hinge joint between the first and the second arm wherein, the second arm is placed along the lateral wall of the bone defect;
the said third arm is made to coincide with the centre point on the protractor for proper orientation and;
the said fourth arm is facilitated to measure the defect angle by keeping the fourth arm parallel to the second arm so that, the defect angle formed at the base of the defect can be replicated at the upper end.
2. As mentioned in claim 1, the defect angle formed on the lower end, i.e. between the first and second arm is made to replicate with the angle formed on the upper end, i.e. between the first and fourth arm by ensuring parallelism between second and fourth arm.

The present invention is well adapted to carry out the objects and attain the ends and advantages mentioned, as well as others inherent therein. While, the present invention has been depicted, described, and is defined by reference to particular preferred embodiments of the invention, such references do not imply a limitation on the invention, and no such limitation is to be inferred. The invention is capable of considerable modification in the design, angulation and digitalization of protractor or any equivalents in form and function, as will occur to those ordinarily skilled in the pertinent arts.
Henceforth, the modifications in form and function which are equivalents should be reserved in the confine of above- mentioned claims.
The depicted and described preferred embodiments of the invention are exemplary only, and are not exhaustive of the scope of the invention. Consequently, the invention is intended to be limited only by the spirit and scope of the appended claims, giving full cognizance to equivalents in all respects.
, Description: DESCRIPTION

FIELD OF INVENTION
[0001] The present invention generally relates to a field of medicine. More particularly, it relates to a method and a device to measure the depth and angle of defect in teeth of the human jaws.

BACKGROUND OF INVENTION
[0002] Human oral cavity has two major diseases in common; dental caries and periodontitis. Periodontitis is the inflammation of the periodontium i.e. inflammation of periodontal ligament, cementum and the alveolar bone. Periodontitis leads to loss of alveolar bone which supports the teeth and gradually the teeth get loosened in the socket.
[0003] Gingivitis, an early stage of periodontal disease, is usually treatable with no lasting effects by simply dedicating yourself to good oral hygiene and perhaps making a few lifestyle changes, such as avoiding tobacco and cutting back on sugary foods. While, more severe gum disease is called periodontitis, however, can wreak havoc on your teeth.
[0004] The bacteria in plaque can cause your gums to recede, pulling away from your teeth as the bacteria destroys the tissue. The bacteria can even erode the bone that supports your teeth, ultimately resulting in the affected teeth falling out. Although gum disease is preventable in most cases, it’s incredibly common.
[0005] Periodontitis can lead to both horizontal as well as vertical bone loss. For vertical bone loss, regenerative periodontal therapy is the treatment of choice. Among the vertical bone loss or intrabony defects the regenerative therapy holds various options and treatment modalities. The vertical defect angle selection for regeneration is critical and important for predictability of the defect, as all the defects are not regeneratable.
[0006] Conventional technique of defect angle detection is done on radiographs. A correlation between the radiographic changes in alveolar bone level occurring in intrabony defects after periodontal access flap surgery and the corresponding pre-treatment defect angle has been described, where greater potential for bone fill was found in defects with small angles (0- 45 degrees) compared with wide angles (45- 90 degrees). Tonetti et al. (1993b) showed that, for guided tissue regeneration (GTR), wider the radiographic defect angle, the lower the regenerated probing attachment level in intrabony defects. (1) Cortellini and Tonetti (1999) studied 242 intrabony defects treated with GTR and found a significant difference in the CAL outcomes when they compared narrow (< 25 degrees) to wide (> 37 degrees) defects. They concluded that the radiographic defect angle could represent a useful pre-surgical parameter to determine the potential of clinical attachment levels gain in intrabony defects to be treated with regenerative periodontal therapy.
[0007] The defect angle, is formed between two sides; one side is along the length of the root extending from cemento- enamel junction to base of defect and the other side is extending from the base of the defect to the lateral margin of the infrabony defect. The angle formed between the two sides is the defect angle.
[0008] The angle is detected by the radiographs as the conventional method. The limitations of the radiographs as a diagnostic tool should be taken into account when the radiographic angle of an intrabony defect is used to predict the clinical outcome of the regenerative surgery. Certain anatomical structures could mask the intrabony defect and make it radiographically invisible. These include the root, especially if the intrabony defect is primarily located buccally or lingually rather than interdentally, or if the defect wraps around the root when buccal or lingual bony walls of the defect are thick.
[0009] Another, problem with the radiographs is that they showed the underestimation of bone loss up to 1.1 mm therefore, the radiographic defect detection and angle detection for determining the treatment outcome is poor when carried out with the radiographs.
[0010] Hence, the present invention has come out with the design and the method which would accomplish the purpose of measuring the depth of defect and direct visualization of the defect angle with the protractor attached and hence can help in predicting the regeneration in the defect.
PRIOR ART SEARCH

[0011] A search of the prior art did not disclose any patents that read directly on the claims of the instant invention, that are JP6831861B2, RU3226301, JP2020527445A, US8187282B2, RU2299677C1, US9526545B2US10500067B2, US20070173850A1, CN109350291A, CN107802267A, CN10559856A, US20080300605A1, RU10190801, GB2558717A and, US20190388155A1 however, the following patents are considered related but none can be read directly or indirectly on the claims.
[0012] In patent application US8347517B2, the invention relates to measuring a device of flexible material for the determination of parameters for the production of dental prostheses which combines different functions, including protractor, spacing template, ruler and an option of utilizing a compass-formed modulus shear measuring module to facilitate shearing.

OBJECTIVES
[0013] The principle objective of this disclosure is to measure the defect angle of the periodontal osseous defect as it is an important factor for periodontal regeneration.
[0014] It’s yet another objective is to provide the fourth arm (replicating arm) which measures the defect angle formed at the lower end, which is otherwise difficult to visualize directly. The defect angle formed between the first arm and the second arm is same as the angle formed between first arm and fourth arm by maintaining parallelism between second and fourth arm. This facilitates the visualization of defect angle at the upper end of the assembly as it is difficult to measure the angle at the lower end due to lack of visibility.
[0015] It’s yet another objective is to provide a simple, easy and accurate method of detecting defect angle than the conventional radiographic evaluation method.

SUMMARY OF INVENTION
[0016] The present disclosure relates to the design of a defect angle protractor assembly used for measurement of the defect angle made on the two sides of intrabony defect. Where one side coincides with the length of the root of teeth while, the other side coincides with the lateral wall of the defect. The angle made between the two sides is the defect angle.
[0017] The present invention is designed with a defect angle protractor with four arms; the first arm is the vertical arm that has attached protractor at the upper end. The embodiment first arm is placed along the side of the root of the teeth that measures the depth of the defect as distance from the cemento- enamel junction to the base of defect.
[0018] In an embodiment, the second arm that is the adjustable arm is provided with the provision of movement that occurs at the hinge joint between the first and the second arm. The second arm is placed along the lateral wall of the bone defect. The defect angle is made between the first arm and the second arm at the lower end of the assembly.
[0019] In another embodiment, the third arm which is the measurement arm is made to coincide with the centre point on the protractor for proper orientation.
[0020] In one aspect, the fourth arm (replicating arm) is kept parallel to the second arm (adjustable arm) so that, the angle formed at the base of the defect can be replicated at the upper end. The defect angle formed between the first arm and the second arm is same as the angle formed between first arm and fourth arm by maintaining parallelism between second and fourth arm. This facilitates the visualization of defect angle at the upper end of the assembly as it is difficult to measure the angle at the lower end due to lack of visibility.
[0021] The first arm is joined with the second arm which further is joined with third arm and further to fourth arm by the hinge joint between all the arms. The protractor assembly is foldable and compact.
[0022] The present disclosure relates to the design of a defect angle protractor assembly for calculating the defect angle and the depth of defect with four arms made up of stainless steel. The first arm is 10 cm long while the second, third and fourth arm are all 7, 7, 4 cm respectively and with a diameter of 1mm.
[0023] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF DRAWINGS
[0024] The present invention will be described with reference to the following drawings. The drawings and the associated descriptions are provided to illustrate embodiments of the invention and not to limit the scope of the invention:
[0025] FIGURE 1: Figure 1 depicts the exploded open view of the present invention (1) defect angle protractor assembly with all four arms open to measure the defect associated with the tooth in human jaws and protractor attached on the first arm.
[0026] FIGURE 2: Figure 2 depicts the side view of the present invention (1) defect angle protractor assembly with all four arms folded and protractor at the upper end attached to the first arm.

DETAILED DESCRIPTION
[0027] Figure 1 to Figure 2 illustrates the device 1, defect angle protractor assembly in accordance with all the embodiments of the present invention 1.
[0028] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such details as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0029] In the following description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. It will be apparent to one skilled in the art that embodiments of the present invention may be practiced without some of these specific details.
[0030] Embodiments explained herein relates to the defect angle protractor assembly.
[0031] Figure 1 illustrates the exploded open view of the present invention 1, which pertains to a defect angle protractor assembly that is comprised of four arms. The first arm (10) is joined with the second arm (11) which further is joined with third arm (12) and, third arm joined to the fourth arm (13) by the hinge joints (17, 16, 14 respectively) between all the four arms.
[0032] The present invention is designed with a defect angle protractor with four arms; the first arm (10) is the vertical arm that has attached protractor (18) at the upper end. This arm is placed along the side of the root of the teeth in human jaw and measures the depth of the defect.
[0033] In one aspect, the embodiment, the second arm (11) has the provision of movement that occurs at the hinge joint (17) between the first and the second arm. This facilitates the placement of the second arm along the lateral wall of the bone defect. The defect angle (15) is made between the first arm and the second arm at the lower end of the assembly.
[0034] In another embodiment, the third arm (12) which is the measurement arm is made to coincide with the centre point on the protractor (14) for proper orientation.
[0035] In another aspect, the embodiment fourth arm (13) is facilitated to measure the defect angle (15) by keeping the fourth arm (replicating arm) parallel to the second arm (adjustable arm) so that, the angle formed at the base of the defect can be replicated at the upper end. The defect angle (15) formed between the first (10) and the fourth arm (13) is same as that formed at the base of the defect.
[0036] Figure 2 illustrates the present invention 1, which pertains to a defect angle protractor assembly which, is comprised of four arms which are foldable and this makes the assembly compact. The upper end is the end having a protractor while the other end is the lower end.
[0037] One of the modifications, of defect angle protractor assembly, which may be the change in mechanism or functioning of protractor or any equivalent to it. The angle measurement by protractor can be digitalized as well. So, it can be a digital protractor.
[0038] While, the foregoing describes various embodiments of the invention, and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.