Severely deteriorated teeth  that can no longer be filled mustbe covered with a crown. Teeth which have undergone root -canal treatment require an additional post, which is implanted in the root to stabilize the crown.(->facing¹).

¹Facing: On a metal frame ceramic mass/resin is attached with individual colour due to neighbouring teeth.

Resin Crown

Should only be used as a temporary covering for the tooth.

Advantages:

• Rapid manufacture  -  ideal for temporary use
• Low cost

Disadvantages:

• Poor aesthetics
• Short duration
• Poor sealing, caries may occur along edges of crown
• Useful only as a provisional cover

Resin – faced crowns ( metal frame )

Advantages:

• Less expensive than other crowns

Disadvantages:

• Rapid discolouration
• Metal frame visible after short time (rapid abrasion)
• Limited duration

Ceramic crowns on metal frames

Especially in the visible areas of the teeth, these crowns afford an aesthetically convincing alternative.

Advantages:

• Satisfying aesthetically
• Durable

Disadvantages:

• Sensitivity to hot and cold possible
• Approximately 50% of  tooth substance must be sacrificed
• Complex manufacture

Logan crown

The most aesthetically perfect solution is the pure ceramic Logan crown which has no disturbing metal frame.

Advantages:

• Perfect aesthetics - cannot be detected from natural teeth

Disadvantages:

• Danger of fractures through bruxism or if crown is too high
• Manufacture and preparation of teeth more extensive
  

Manufacture of crowns – procedures

1st session :    

1. Preparation of tooth
2. Impression
3. Application of a provisional crown ( resin )

Before the next session the crown is manufactured in our dental lab using up-to-date technology to achieve a perfect match of colour and form.

2nd session:          

1. Crown checked for perfect  aesthetics and function
2. Crown attached with dental cement ( metal – ceramics )
3. Crown attached with special adhesive technique ( Logan crown )