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Production method of snap ring (professional snap ring, stop ring manufacturer)


Release time:

2018-07-24

There are many types of clasping, and the classification methods are different. In addition to the classification according to the relationship between the clasping and the observation line, the clasping arms are generally classified according to the production method and the number of clasping arms. Classification according to the production method: ① Casting clasp: It is made of wax type, embedded, and made of high melting alloy through casting process. The cast snap ring includes a ring-shaped snap ring and a rod-shaped snap ring. Ring-shaped clasping ring: it surrounds 3 surfaces and 4 axis angles of the abutment teeth, I .e. it surrounds more than 3/4 of the crown of the abutment teeth and is shaped like a circle, hence the name ring-shaped clasping ring. This clasper is the first application of Aker(1936), so it is also called Aker clasper. Circular ring clasping ring is suitable for periodontal tissue health, teeth

Production method of snap ring (professional snap ring, stop ring manufacturer)

There are many types of clasping, and the classification methods are different. In addition to the classification according to the relationship between the clasping and the observation line, the clasping arms are generally classified according to the production method and the number of clasping arms.

According to the production method of classification:

① Casting clasp: It is made of wax type, embedded, and made of high melting alloy through casting process. The cast snap ring includes a ring-shaped snap ring and a rod-shaped snap ring. Ring-shaped clasping ring: it surrounds 3 surfaces and 4 axis angles of the abutment teeth, I .e. it surrounds more than 3/4 of the crown of the abutment teeth and is shaped like a circle, hence the name ring-shaped clasping ring. This clasper is the first application of Aker(1936), so it is also called Aker clasper. The circular ring clasp is suitable for the abutment teeth with healthy periodontal tissue and good crown shape, and its support, retention and stabilization are good. Rod clasp: Rod clasp was first proposed by Roach(1934), so it is also known as Roach clasp. This kind of clasp has relatively independent buccal arm and lingual arm. The clasp arm extends from the metal bracket of the base, the retention net in the base or the large and small connecting body, and passes through the gum to the inverted concave area under the convex point on the lip and cheek of the base. Its retention function is push-type retention from bottom to top, so it is also called push-type clasp. It is suitable for the abutment teeth with free loss of posterior teeth, which has good retention effect but poor stabilization effect.

② bending card ring: bending card ring is made of round stainless steel wire bending. General molar clasps with a diameter of 0.9~1.0mm(20~19) steel wire, premolar and anterior clasps with a diameter of 0.8~0.9mm(20~20) steel wire. The support is made by flattening and bending stainless steel wire with a diameter of 1.2mm (No. 18), and it is better to use casting support. Because this kind of clasps are in linear contact with the surface of the abutment teeth, the contact area is small, smooth, easy to clean, the caries rate of the abutment teeth is low, and the production equipment is simple, easy to operate, easy to adjust, economical and durable, so it is still widely used in clinical practice.

Design form of casting and bending card ring:

Ring-shaped clasp (also known as ring clasp): mostly used for isolated last molars and inclined to the mesial cheek (upper jaw) or mesial tongue (lower jaw) side. The clasp surrounds almost the entire crown axis, and the clasp arm has an elastic tip that ends in the mesial buccal area of the maxillary molar or the mesial lingual area of the mandibular molar. The cast ring clasp can be designed with two (occlusal) supports at the near and far middle (occlusal) edge. The non-retaining side clasp arm should not enter the concave and should be supported by auxiliary clasp arm. The bent ring clasp only has a near-center (occlusal) support, and the non-retaining side clasp arm should extend the base to a far-center wrap to reinforce and oppose the arm to avoid the clasp arm being too long and deformed.

Pullback clasp: commonly used for missing free end of posterior teeth. The abutment is premolar or canine with short or tapered crown. Its characteristics are: the tip of the clasp arm is located in the labial (buccal) side of the abutment, bypasses the distal surface of the abutment to connect with the (occlusal) support, then turns to the lingual side non-inverted concave area to form an opposing arm, and is connected with the palatal (lingual) rod through a small connector in the proximal lingual. If the tip of the snap ring arm is located in the lingual concave area of the abutment (such as the mandibular abutment is seriously inclined to the lingual side), the snap ring arm is connected with the distal (occlusal) support and turns to the buccal side, and is connected with the metal support of the base through a small connecting body in the near part, it is called a reverse force snap ring. Both of them are cast clasps. Since the distal (occlusal) support is not directly connected with the base, the lifting force is first transmitted to the mucosa and alveolar ridge through the artificial teeth and the base, and then transferred back to the base, which reduces the load of the base and has the effect of stress interruption.