Ceramic Dental Restorations

With conventional metal-ceramic restorations, the load-bearing substructure of a crown or bridge is made of metal and is veneered with ceramic at least in the visible area.

With an all-ceramic restoration, this conventional metal base is replaced by a ceramic restorative concept.

This can take very different forms:

• a restoration made entirely from one ceramic,
• a ceramic framework with ceramic veneering,
• a monolithic zirconia crown,
• or a monolithic glass-ceramic restoration.

“All-ceramic” therefore initially means that the prosthetic restoration is built without a conventional metal framework.

It does not yet state which ceramic is being used or whether that ceramic is the right choice for the relevant tooth or restoration.

No.

This is one of the most important points in understanding all-ceramic dental restorations.

Dental ceramics differ in areas including:

• strength,
• fracture behaviour,
• light transmission,
• colour and translucency,
• required material thickness,
• processing,
• bonding or cementation,
• and the clinical situations for which sufficient data are available.

Even within the term zirconia, different generations and compositions exist.

The current S3 guideline on implant-supported all-ceramic restorations explicitly notes that different zirconia types have different optical and biomechanical properties.

The statement “we use zirconia, so the material question is solved” would therefore be too simplistic.

Lithium disilicate belongs to the glass-ceramic group.

Such ceramics can be particularly relevant where optical properties and adhesive bonding are important alongside mechanical function.

Lithium disilicate is used, among other things, for certain:

• inlays,
• onlays,
• partial crowns,
• veneers,
• and single crowns.

Whether lithium disilicate is appropriate for any of these restorations depends on the defect, tooth position, material thickness, loading and bonding options.

The material is therefore not automatically the correct choice simply because it is regarded as “aesthetic”.

Zirconia is also a dental ceramic, but its structure differs substantially from conventional glass ceramics.

One important characteristic of many zirconia types is their high mechanical performance.

Zirconia is therefore used, among other applications, for more highly loaded restorations and certain bridge designs.

However, “zirconia” is not one uniform material either.

Newer generations have, among other things, been developed to alter optical properties. In doing so, translucency and mechanical properties can influence one another.

Selection should therefore not follow the simplified rule:

“Zirconia is stronger, so zirconia is always better.”

The specific design and indication remain decisive.

Monolithic means that the main body of the restoration is manufactured from one continuous ceramic material.

A monolithic zirconia crown, for example, does not consist of a zirconia framework that is completely covered with an additional aesthetic ceramic layer.

This can offer technical advantages because there are fewer additional veneering layers that could chip.

Even a monolithic restoration must still be correctly planned with regard to:

• material selection,
• minimum thickness,
• occlusion,
• surface finishing,
• aesthetics,
• and indication.

“Monolithic” is therefore a design concept, not an automatic quality rating.

With a veneered all-ceramic restoration, the framework is also ceramic but receives additional ceramic layers to shape and colour the restoration.

This allows different optical effects to be created.

At the same time, another material interface is created within the restoration. Veneering ceramic can therefore develop its own technical complications such as chipping.

Current guideline data, particularly for implant-supported constructions, show that monolithic and veneered designs should not simply be treated as equivalent.

Which design is appropriate depends on the specific restoration.

All-ceramic restorations can provide very good optical properties.

Ceramics can offer advantages particularly where light transmission, natural shade effects and a metal-free restoration margin are aesthetically relevant.

However, this should not become a claim that every all-ceramic crown automatically looks more natural than every metal-ceramic crown.

The result is also influenced by:

• the starting shade of the prepared tooth,
• gum contour,
• restoration thickness,
• material type,
• dental laboratory work or digital design,
• surface texture,
• neighbouring teeth,
• and the specific position in the mouth.

Aesthetics therefore result from material plus planning and execution, not from the label “all-ceramic” alone.

No.

“Metal-free” is first of all a material description, not a general medical quality seal.

All-ceramic restorations can have very good tissue compatibility. This does not mean that metal-based dental restorations are generally harmful to health or medically inferior.

Metal-ceramic restorations have also been clinically established for many years and may be appropriate depending on the situation.

The decision should therefore not be based on blanket claims such as:

• “metal burdens the body”,
• “ceramic is always more biocompatible”,
• or “metal-free is automatically healthier”.

If a genuine allergy or material-related medical question exists, it must be assessed specifically.

Depending on the material and design, all-ceramic materials can be used for different fixed restorations.

Examples include:

• inlays and onlays,
• partial crowns,
• single crowns,
• veneers,
• certain bridges,
• and certain implant-supported restorations.

This does not mean that every ceramic is suitable for all of these restorations.

With bridges in particular, span length, position and loading can substantially change the mechanical requirements.

The current S3 guideline on implant-supported all-ceramic restorations therefore gives specific material recommendations for certain multi-unit posterior bridges while also noting limited evidence for other ceramic systems.

For certain bridge situations, zirconia has stronger clinical evidence than some other all-ceramic materials.

For example, the current S3 guideline recommends zirconia from the studied material class for certain 3- to 4-unit implant-supported posterior bridges.

This must not be generalised to every bridge.

A:

• tooth-supported anterior bridge,
• implant-supported posterior bridge,
• single crown,
• or long-span restoration

represents a different prosthetic task in each case.

A material-specific guideline recommendation for one particular construction therefore does not mean:

“Zirconia is the best material for every dental restoration.”

In visible teeth, aesthetic requirements are often particularly high.

Relevant factors include:

• light transmission,
• shade effect,
• surface texture,
• tooth shape,
• transition to the gums,
• and harmony with neighbouring teeth.

Depending on the restoration, glass-ceramic materials can offer interesting optical properties here.

Modern zirconias should likewise no longer be equated with the older idea of an inherently opaque white material.

Material selection therefore depends on the specific restoration type and the combined aesthetic and functional goal.

In posterior teeth, functional loading becomes more important.

Chewing forces, restoration thickness, available space, opposing teeth and possible parafunctional habits must be taken into account to a greater extent.

Mechanically strong ceramics may therefore be particularly suitable in certain situations.

Even here, however, there is no simple automatic rule:

Posterior tooth = always zirconia.

For single crowns or partial restorations, different ceramic systems may be appropriate depending on the findings.

Clenching and grinding can place additional loads on natural teeth and ceramic restorations.

This does not automatically rule out all-ceramic treatment.

However, planning may need to consider:

• material,
• restoration design,
• material thickness,
• bite design,
• surface condition,
• and, where appropriate, protective measures.

A highly aesthetic material is of little benefit if it is used inappropriately for the actual functional load.

Yes.

Ceramic dental restorations can also develop technical complications.

Depending on the design, these can include:

• fractures,
• chipping of veneering ceramic,
• loss of cementation or bonding,
• damage to prosthetic components,
• or function-related problems.

Risk does not depend solely on the name of the material.

Restoration design, material thickness, processing, bonding or cementation, bite and individual loading also play a role.

The statement “ceramic is unbreakable” is therefore just as incorrect as the opposite claim that ceramic is inherently too brittle for load-bearing restorations.

Ceramic surfaces interact with the opposing tooth or restoration during chewing.

The amount of wear that develops depends on factors including:

• ceramic type,
• surface polish,
• any glaze,
• bite,
• grinding,
• and the condition of the opposing arch.

Here too, the specific surface quality and functional planning are more important than the blanket category “ceramic”.

The material alone does not determine wear of the opposing tooth.

Yes. All-ceramic restorations can also be used on implants.

Here in particular, however, different constructions must be distinguished:

• single crowns,
• short-span bridges,
• larger bridges,
• and extensive full-arch restorations

have different requirements and different levels of supporting evidence.

The current S3 guideline was formulated specifically by material and construction for this reason.

A general promise such as “all-ceramic implant restorations are always the most modern solution” would be too broad.

No.

All-ceramic describes the restorative material or material design.

CEREC describes a digital CAD/CAM workflow that can be used to scan, design and manufacture certain restorations.

A ceramic restoration can be manufactured digitally without all ceramics becoming the same material.

Conversely, owning a CAD/CAM system does not determine which material is medically appropriate.

The sequence is:

clinical findings and restoration type → suitable material → appropriate manufacturing workflow.

More about CEREC and CAD/CAM

Not necessarily for every possible restoration, but material and manufacturing effort can influence costs.

For patients with statutory health insurance, it is also relevant which standard care is defined for the clinical finding and which restoration is actually selected.

An all-ceramic version may, depending on the findings, go beyond standard care and therefore change the patient's personal contribution.

A blanket internet price is therefore of little value.

For a cost comparison, the specific restoration — such as a single crown, bridge or implant-supported restoration — must be considered.

A sensible material decision considers several levels at the same time:

Restoration

Is the treatment an inlay, a single crown, a bridge or an implant-supported restoration?

Position

Anterior and posterior regions have different optical and functional requirements.

Loading

How heavily will the restoration be loaded during chewing or parafunctional activity?

Space and preparation

How much material thickness is available and how much tooth structure can be preserved?

Aesthetics

How demanding are the requirements for translucency, shade and matching neighbouring teeth?

Bonding or cementation

Not every ceramic is fitted in the same way.

Evidence

For which specific material-and-design combination are robust clinical data available?

These questions are more meaningful than the blanket question: “Which ceramic is best?”

The table is intended only as orientation. The actual material indication depends on the specific restoration.

All-ceramic dental restorations are not one single material but a group of metal-free ceramic restorative concepts.

Key points include:

• Glass ceramics such as lithium disilicate and zirconia differ substantially.
• Different generations of zirconia also have different properties.
• Monolithic and veneered ceramic constructions are not the same.
• Aesthetics, mechanical loading, restoration type, material thickness and bonding or cementation influence material selection.
• “Metal-free” does not automatically mean “healthier” or “better”.
• No ceramic type is universally superior for every crown, bridge or implant restoration.
• CAD/CAM or CEREC describes the manufacturing pathway, not the medical material indication.

For detailed information about possible restoration types:

Dental restorations CEREC and CAD/CAM

The medical information in this article is based in particular on the current S3 guideline on all-ceramic fixed implant-supported restorations, current KZBV patient information and systematic clinical literature on different ceramic materials.

The former general German S3 guideline on all-ceramic crowns and bridges has now expired. Its older statements are therefore not presented as current guideline recommendations. The current implant-prosthetic guideline is used only within its actual scope and is not generalised to every tooth-supported restoration.

Editorial review date: 9 August 2026. This article does not replace an individual prosthetic examination or material planning.