Method for preparing neck and shoulder of tooth in complete coronal restoration process and special needle thereof

Abstract

The invention relates to a preparation method of a neck and a shoulder of a tooth during the tooth full crown repair process, the specific steps are that: a shoulder preparation special machine needle which is provided with a columnar base part, a columnar middle part and a spherical or short columnar top part with sands is adopted, the radius of the top part of the special machine needle is 1.2 to 1.4mm, the radius of the middle part is 0.3mm while the length is 8 to 10mm; the radius of the base part is 1mm while the length is 8 to 10mm; the base part of the special machine needle is arranged on a mobile phone to rotate the machine needle, the top part of the machine needle is arranged on a tooth tissue which is near to a gum and can move along the outline of the gum, the middle part of the machine needle is parallel or nearly parallel to the surface of the tooth, when the middle part of the machine needle is tightly affixed with the tooth surface, the shoulder with the depth of 0.9 to 1.1mm is formed at the edge of the tooth, thus completing the preparation of the tooth edge at the labial side / buccal side. The method can ensure the accurate preparation amount of the neck and the shoulder of the tooth during the full crown repair treatment process, the full crown and the tooth have great marginal adaptation, and the full crown has high strength and pleasing appearance after the repair, which is conductive to the oral health. The method further has simple operation and time conservation, which is not easy to damage the periodontal tissue during the preparation process.

Description

technical field [0001] The invention relates to a tooth preparation method and a special bur for dental crown restoration treatment. Background technique [0002] At present, in the process of oral restorative treatment, the most common restoration method is crown restoration. The restoration process is: first prepare the tooth body of the patient's tooth or the tooth that has undergone root canal treatment, that is, grind the tooth body into a suitable Put on the shape and size of the restoration, and then use artificial gold-ceramic or all-ceramic crowns to tightly fit the prepared teeth to restore the shape and function of the teeth. Dental preparation includes cervical shoulder (tooth edge), buccal and lingual body and proximal preparation. Among them, the preparation requirements for the neck shoulder are the highest. For porcelain-fused-to-metal crowns, the shape of the neck shoulder is often required to be a concave edge, and the most commonly used edge preparation i...

AI Technical Summary

Problems solved by technology

If there is too much preparation on the edge of the tooth, the depth of the shoulder is much greater than 1.0mm, and the amount of residual tooth tissue is too small, it will cause the strength of the tooth to decline

If the edge preparation of the tooth is insufficient and the shoulder depth is less than 1.0mm, it will lead to: 1. The crown is easy to form an overhang at the edge, and the fit between the crown and the tooth is not good, and it is not conducive to the cleaning of the teeth. It is easy to accumulate a large amount of plaque on the edge of the tooth, and over time it will form dental calculus, where the bacteria accumulate and stimulate the absorption of bone tissue, which will cause periodontal tissue diseases and lead to periodontal disease

2. The thickness left for the edge of the crown is not enough. For the porcelain-fused-to-metal crown, the porcelain on the surface is too thin, which makes the edge of the crown see through the metal color and affects the appearance of the restored tooth.

This is because the commonly used burs used for tooth edge preparation do not accurately quantify the cut tooth tissue, and the grinding depth of the tooth edge depends on the doctor's naked eye observation, resulting in a large error in the amount of tooth edge preparation And for the sake of aesthetics, the edge of the full crown is often placed under the gums. Due to the occlusion of the gums, the edge of the tooth to be prepared is not within the doctor's field of vision. The doctor can only estimate the grinding thickness based on clinical experience , which increases the error of tooth margin preparation, leading to a large number of unqualified margin preparation cases in clinical practice, and it is easy to injure the gums, further damage the periodontal tissue, and seriously affect the health and appearance of patients

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