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KR-102962416-B1 - Multilayer Structure Stopper for Dental Endodontic Files

KR102962416B1KR 102962416 B1KR102962416 B1KR 102962416B1KR-102962416-B1

Abstract

The present invention relates to a multilayer structure stopper for a dental root canal file, which can precisely set the insertion depth of the root canal file and allows the practitioner to intuitively identify the specifications of various stoppers by distinguishing each thickness specification with different colors, and is configured to include a stopper body (10), a file hole portion (20), and an elastic wall (30) so that the insertion depth can be stably maintained during the procedure by preventing the stopper from detaching through the elastic restoring force of the elastic wall inside the file hole portion adhering to the root canal file.

Inventors

  • 오명철

Dates

Publication Date
20260507
Application Date
20251127

Claims (5)

  1. A stopper mounted on a dental root canal file for setting the insertion depth of the root canal file, A stopper body (10) formed in a cylindrical shape; and It includes a file hole portion (20) formed in the center of the stopper body (10) and formed smaller than the diameter of the root canal file (1) so as to be fixed to the root canal file (1) by elastic deformation; The above stopper body (10) is formed according to specifications at intervals of 0.5 mm within a thickness range of 0.5 to 6 mm, and is provided to set the insertion depth of the root canal file (1) during the root canal treatment process through a combination of stopper bodies (10). One of the stopper bodies (10) inserted into the root canal file (1) is formed as a heat-reactive body (40), and The above-mentioned heat-reactive body (40) is configured to change color in response to temperature changes that occur when the root canal file (1) rotates inside the root canal, and The thermoreactive body (40) comprises a thermochromic material including microencapsulated thermochromic pigments, and the thermochromic material is configured to change color in stages in response to a temperature change in the range of 35°C to 60°C. It is provided to visually provide an increase in rotational heat or an overheating state of the root canal file (1) based on the color information of the above-mentioned heat-reactive body (40), thereby preventing tissue burn and thermal damage to the root apex. A conductive disk (41) is formed on one end surface of the above-mentioned thermoreactive body (40), and The above-mentioned conductive disc (41) has a conductive hole (42) formed at a position corresponding to the file hole (20) and contacts the outer surface of the root canal file (1). The above conductive disk (41) is formed as a metal-based thermal conductive composite thin film layer comprising one or more of aluminum (Al), copper (Cu), and silver (Ag) powders, or a carbon-based thermal conductive composite thin film layer comprising one or more of graphene flakes, graphite, and carbon nanotubes (CNT). A multilayer structure stopper for a dental root canal file, characterized in that the conductive disc (41) is configured to uniformly transfer heat generated from the root canal file (1) to a thermochromic material through one end surface of the stopper body (10).
  2. In Article 1, A multi-layered stopper for a dental root canal file, characterized in that the stopper body (10) is marked with different colors according to each thickness specification, making it easy to visually distinguish when setting the insertion depth of the root canal file (1).
  3. In Paragraph 1 or 2, An elastic wall (30) is formed inside the above file hole portion (20), and A multilayer structure stopper for a dental root canal file, characterized in that when the root canal file (1) is inserted into the file hole (20), the elastic wall (30) is opened by the root canal file (1) and then adheres to the outer surface of the root canal file (1) by means of elastic restoring force, thereby restraining the stopper body (10) to the root canal file (1).
  4. In Paragraph 3, A multilayer structure stopper for a dental root canal file, characterized in that the elastic wall (30) is formed with a thickness of 0.3 to 0.5 mm.
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Description

Multilayer Structure Stopper for Dental Endodontic Files The present invention relates to a multilayer structure stopper for a dental root canal file, and more specifically, to a multilayer structure stopper for a dental root canal file that can precisely set the insertion depth of the dental root canal file and prevent damage to the apical tissue from overheating of the file that may occur during the procedure. Root canal treatment is a dental procedure involving the removal of infected pulp tissue and the shaping of the root canal, requiring the root canal file to be inserted to a precise depth along the inside of the canal. To this end, a method of maintaining a constant insertion depth by attaching a stopper to the shaft of the root canal file has been widely used. Conventional stoppers are mostly simple ring-shaped devices with a single-layer structure made of silicone or rubber, and are configured to be fixed using only an elastic connection to the outer surface of the root canal file. However, this structure has several limitations in ensuring the precision and safety of root canal treatment. In other words, conventional stoppers have a problem in that they are not provided with a variety of thickness specifications or the steps between specifications are inconsistent, making it difficult to finely control the depth based on the measured root canal length. In root canal treatment, a depth error of several hundred micrometers can lead to over-insertion or insufficient root canal shaping, so a lack of precision in depth control is a factor that impedes the accuracy of the procedure. In addition, conventional stoppers lack a color system, making it difficult to visually distinguish the specifications of the stoppers clearly. During the procedure, multiple stoppers are often used in stages to set various lengths, but if the color distinction is unclear, it is difficult to immediately identify the specifications of the stoppers, which reduces the operator's ease of operation. Furthermore, since conventional stoppers have a simple internal structure for the file hole and are fixed to the root canal file solely by elasticity, the stopper frequently moves along the file shaft or becomes loose due to the rotation of the root canal file, repetitive back-and-forth motion, or vibrations occurring within the root canal. This causes the actual insertion depth of the root canal file to differ from the plan and can lead to procedural defects such as over-insertion beyond the root canal end or insufficient shaping. Furthermore, significant frictional heat is generated as root canal files rotate during the root canal treatment process. In particular, heat accumulation is intensified in root canals with significant curvature, which can lead to tissue burn or apical cell damage. Nevertheless, conventional technology has limitations in that it is difficult to respond promptly to procedural safety issues caused by overheating, as it does not provide a structure that allows the operator to perceive temperature changes in the root canal file in real time. Overheating not only causes damage to apical tissues but also exacerbates material fatigue of the root canal file, thereby increasing the likelihood of fracture. Meanwhile, prior art, published patent No. 10-2024-0136037, presents a structure designed to reduce interference with the inner wall of the root canal and prevent fracture by improving the shape of the cutting edge of a root canal file. However, this technology focuses only on improving the mechanical stability of the root canal file and does not include technical means to resolve structural problems of the stopper, such as depth control, fixation force of the stopper, visual specification differentiation by color, and the provision of information regarding heat changes occurring during the procedure. For example, the above-mentioned prior art has problems such as the absence of a multi-layered structure for precise depth control, the absence of a clear color standard system for improved visibility, the absence of internal structural support elements for secure connection with the file, and the absence of a safety management function that visually provides a risk of overheating. FIG. 1 is a schematic diagram showing the overall structure of a multilayer structure stopper for a dental root canal file according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing the usage state of a multilayer structure stopper for a dental root canal file according to an embodiment of the present invention. FIG. 3 is a configuration diagram showing the state in which colors are assigned according to stopper body specifications of a multilayer structure stopper for a dental root canal file according to an embodiment of the present invention. FIG. 4 is a schematic diagram showing an elastic wall of a multilayer structure stopper for a dental root canal file according to an embodiment of the present in