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Dental Inlays and Onlays (Indirect Restorations)

Indirect indirect restorations: ceramic, gold, and composite alternatives to crowns and large fillings

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Ağız ve Diş Sağlığı department. Book Appointment →

What is Dental Inlays and Onlays (Indirect Restorations)?

Indications: large carious lesions or fractures (cavity isthmus >1/3 intercuspal distance, or one or more cusps requiring coverage), failed direct restorations, replacement of large amalgams, post-endodontic restoration (inlay/onlay alternative to crown for premolars). Materials: porcelain/lithium disilicate (e.max), zirconia, gold alloy (most durable - decreasing use), composite resin (lower cost, less wear-resistant).

Tooth preparation principles: divergent walls (5-7° taper for path of insertion), butt margins (avoid bevels for ceramics), cusp protection on weak cusps (>2 mm thickness), avoid undercuts. Preparation depth: 1.5-2 mm pulpal floor, 1.5 mm reduction over cusps for onlay, 1 mm shoulder margin. CAD/CAM (CEREC) enables single-visit fabrication; conventional requires impression + temporary + lab fabrication (2 visits).

Cementation: adhesive bonding (resin cement) for ceramics and composite, conventional cementation (zinc phosphate, GIC) for gold. Etching of restoration (HF acid for porcelain), silane application, primer/bond, dual/light cure cement. Long-term success: gold 95% at 10 years, ceramic 80-90% at 10 years, composite 70-85% at 10 years. Failures: cement washout, marginal leakage, fracture, recurrent caries.

Symptoms

(Inlays/onlays are a restoration type, not a disease)
Indications for inlay/onlay:
Large carious lesion exceeding ideal direct restoration size
Cuspal fracture (one or more cusps)
Failed large amalgam or composite restoration
Post-endodontic restoration (premolar onlay alternative to crown)
Aesthetic improvement with strong restoration
Patient with bruxism (gold/zirconia onlay)
Cracked tooth syndrome (cusp coverage protective)

Risk Factors

Indications and risk factors:
Large lesions (caries, fracture)
Tooth wear, attrition, erosion
Failed previous restorations
Endodontically treated teeth (especially molars - crown preferred)
Bruxism (gold or zirconia preferred for strength)
Aesthetic considerations (anterior teeth - ceramic inlays rare)
Root canal-treated tooth requiring strong restoration
Limitations: subgingival cavities (difficult isolation), fractured non-restorable teeth (extraction)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Large existing filling failing or with secondary caries
  • Cracked tooth syndrome with sensitivity to chewing
  • Recently completed root canal treatment (premolar)
  • Cosmetic concerns about discolored composite
  • Recurring fracture of composite restoration
  • Severe wear of natural tooth
  • Pre-prosthetic evaluation
  • Failed crown requiring replacement (consider onlay if conservative possible)

Treatment Methods

01
Diagnostic evaluation: clinical exam, radiograph, transillumination (cracks)
02
Treatment planning: inlay vs onlay vs crown decision based on remaining tooth structure
03
Material selection: ceramic (lithium disilicate, e.max), zirconia, gold, composite
04
Tooth preparation: caries removal, cuspal protection, divergent walls
05
Conventional: impression (PVS, polyether) + temporary restoration + lab fabrication (2 weeks)
06
CAD/CAM (CEREC, E4D): single-visit, intraoral scan, milled in office (2-4 hours)
07
Try-in: marginal fit, occlusion, contacts, esthetics
08
Cementation:
09
- Ceramic: HF etch, silane, adhesive bonding (resin cement)
10
- Gold: zinc phosphate or GIC
11
- Composite: resin cement
12
Occlusal adjustment, polishing
13
Post-cementation evaluation (radiograph, marginal integrity)
14
Maintenance: 6-month recall, oral hygiene, occlusal protection (nightguard if bruxism)
15
Long-term follow-up for marginal integrity, recurrent caries

Which Department to Visit?

You can visit our Ağız ve Diş Sağlığı department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Ağız ve Diş Sağlığı Department

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.