Type III : Partial root tension retaining rubber cap snap-on prosthesis
After root is sectioned, pulp chamber is thoroughly cleared away and root canal is cleansed and scraped (carefully with gentle hands). If tooth stump is too loose, then extraction is inevitable.
How to determine if a loosened tooth can be kept?
- If tooth stump still contains at least half of its original height.
- When gently shaken, the tooth feels as if there is adjacent bone structure supporting it. Then the tooth stump can be kept.
- Can add snap-on casting stud on the inner crown to hold and securely grasp the rubber cap in the outer crown.
- Can restore the health of its surrounding bone. After endodontic therapy, tooth stump and the health of its surrounding bone can be restored with increased bone density and increased height of bone structure. If tooth stump is extracted, the healthiness of the bone cannot be restored. Its surrounding bone structure will slowly erode away lowering its height and at the same time, reduce its strength. What seems to be a convenient, easy, time saving, trouble free solution when extracting, will lead to dental implants. After all, implants require drilling into the bone creating a perfect passage for bacteria to penetrate through and affect the rest of the body. Unless it is absolutely necessary, dental implants are highly discouraged.
- If tooth stump is extracted, then relying only on Rest Arms tension retaining pin to grasp outer crown is not as stable. Having partial root allows fabrication of casting stud which is used to secure outer crown ensuring normal mastication function.
- With added casting stud and rubber cap snap-on fastener, there is no need to seek out technicians or dentists for repair immediately in case tension retaining pin is lost.
After 4 or 5 years of wear and tear, T-post at the supporting alloy plate may break off. Although the outer crown may not be torn apart by sticky food, its tension retaining pins may become loose. When a restoration only depends on tension retaining pins to grasp ahold of the T-post for security, patient runs the risk of having to find a dentist for immediate repair. If casting ball and rubber cap fastener is also fabricated, in case T-post breaks off, patients still can depend on the fastener holding crowns together. Repair can be sought out later at a more convenient time. Therefore, saving remaining tooth stump should be the most important task if at all possible. It has its purpose:
- Keep remaining bone structure, which allows it to return to its healthy state. Otherwise, bone slowly erodes away and height diminishes similar to sinking quicksand, which eventually affects adjacent healthy teeth bone structure.
- Stabilize outer crown allowing normal chewing function. Avoid embarrassment of losing T-post.