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Direct Damage Due to Faulty Restorations and Appliances

A. Incorrect Crown Placement. The crown is a metal, ceramic or ceramic-store-metal floor severely damaged teeth. Placing a crown on a damaged tooth is a common mechanism used to store badly damaged tooth.

1. Crowns can sometimes be placed incorrectly, when the tooth structure is minimal. There may be direct damage periodontal, when the edge of the crown (called fields) are placed below the gingival margin and too close alveolar bone.

2. The crown margin, closer than 2 mm up to the crest of the alveolar bone in the resorption of the alveolar bone (Fig. 7-11).

Tooth preparation for complete crowns

3. Biological Width refers to the space on the tooth surface occupied paroxizmalnaya form epithelial and connective tissue attachments fibers immediately apical (see below) paroxizmalnaya form epithelium (Fig. 7-12). This biological Width can be "broke" or damaged during the restoration of profitability.

In a series of drawings figure 7-13 shows biological width and its relationship with the properly placed margin and restoration margin, which violates or damage to biological Width.

Preparing teeth for crowns

B. Incorrect Contour Restorations

1. Bulky or overcontoured crowns or recovery may lead to inadequate space between teeth to accommodate the natural form of the interdental papilla.

2. Open space to the apical zone of contact between two adjacent teeth is called the arrow space. In health, the loopholes of the space is filled with interdental papilla.

3. Bulky kroons to reduce the size of the opening space so that there is insufficient space between the teeth to accommodate the interdental papilla. In this situation, bulky CZK described as an attempt on the breach of space (Fig. 7-14).

C. Faulty Removable Denture

1. The prosthesis is a device is used to replace missing teeth.

a. Removable prosthesis is that the patient can be removed for cleaning and before bedtime. Removable denture, which replaces several teeth, usually called a partial denture. B. Dentures should be distinguished from fixed prosthesis. Non-removable prosthesis is a prosthesis, which is attached to the teeth (also known as permanent bridge).

2. Damaged or poorly fitting dentures, can affect gum tissue and benefit plaque biofilm accumulation and thus to accelerate the progress of periodontitis (Fig. 7-15).

Crown put on incorrectly ..

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