Lava Prep Design
Cinical Requirements for Adhesive and Inlay Bridges

Many Procedures Remain the Same
With 3M™ ESPE™ Lava™ crowns and bridges, you provide
high-quality restorations to your customers. In addition to
natural esthetics and durability, Lava crowns and bridges also
stand out for their excellent fit. To achieve this, practice and
laboratory have to meet just a few basic requirements.
Zirconium Oxide – the Framework


Recommended preparation for anterior teeth.

Material of the Future
Unlike traditional all-ceramic restorations, Lava™ restorations are made of zirconium oxide. This strong material does not require a
distinct shoulder to support the framework or to enhance the esthetics. In addition, the margins can be thinly tapered. This means the preparation for Lava restorations protects the tooth structure.

Minimal Reduction
The zirconia used for Lava™ framework is strong enough to allow for thin walls. Space for an opaque layer is not required. Therefore, a reduction of the tooth structure based on the dimensions indicated below is sufficient.


Recommended preparation for posterior teeth.

Shoulder or Chamfer to set Precise Limits
Ideally, the preparation includes a circumferential shoulder or chamfer with a horizontal angle of at least 5°. The vertical preparation angle should be at least 4°. The inside angle of the shoulder preparation must be given a rounded contour. All occlusal and incisal edges should also be rounded.
The marginal edge of the preparation needs to be continuous and clearly visible. A bevel should be avoided. For posterior and anterior teeth, a supragingival margin poses no problems. Due to the tooth-colored framework, very aesthetic results can be achieved.