When a patient presents with a compromised molar that requires a strong, long-lasting, and aesthetic solution, zirconia crowns are often the treatment of choice. In this blog, we present a detailed case of restoring tooth 36 (lower left first molar) with a zirconia crown, highlighting the clinical approach, benefits, and outcome.

Patient History & Chief Complaint

A 34-year-old patient reported with a complaint of difficulty in chewing and mild sensitivity in the lower left back region. The patient had undergone root canal treatment (RCT) in tooth 36 two months ago. The tooth was functional but structurally weakened, requiring full coverage restoration for protection and long-term stability.

Clinical Examination

  • Tooth: 36 (mandibular left first molar)
  • Status: Endodontically treated, reduced cuspal support
  • Surrounding dentition: Healthy
  • Periodontal health: Good, no mobility
  • Occlusion: Stable with opposing maxillary molar
  • Diagnosis: Endodontically treated tooth 36 requiring full-coverage crown

Treatment Plan

A zirconia crown was planned for tooth 36 due to its:

  • Superior strength compared to ceramic or porcelain-fused-to-metal (PFM) crowns
  • High fracture resistance, especially suitable for posterior load-bearing teeth
  • Excellent biocompatibility and gum adaptability
  • Aesthetic resemblance to natural teeth

Step-by-Step Clinical Procedure

1. Tooth Preparation

  • Tooth 36 was reduced circumferentially with 1.5–2 mm occlusal clearance to accommodate the zirconia crown.
  • Rounded internal line angles were maintained to prevent stress concentration.
  • Smooth finish lines with a deep chamfer margin were created for better crown adaptation.

2. Gingival Retraction

  • Retraction cord was placed to expose the margins clearly.
  • This ensured precise impression capture.

3. Impression Making

  • Final impression was taken using addition silicone (PVS) impression material.
  • Opposing arch impression and bite registration were also recorded.

4. Shade Selection

  • Although zirconia crowns for posterior teeth focus more on strength than esthetics, a shade close to the patient’s natural dentition was chosen for harmony.

5. Temporary Crown

  • A temporary crown was fabricated and cemented to protect the prepared tooth while the permanent crown was being made in the lab.

6. Crown Fabrication

  • The impression was sent to the dental laboratory.
  • Using CAD-CAM technology, the zirconia crown was designed and milled for precise fit and contour.
  • High-translucency zirconia was chosen for a balance of strength and natural appearance.

7. Crown Trial and Cementation

  • At the next appointment, the zirconia crown was tried in.
  • Checked for Once confirmed, the crown was cemented using resin-modified glass ionomer cement.

Post-Treatment Instructions

The patient was advised:

  • Avoid chewing on hard objects (ice, pen caps) to prolong crown life
  • Maintain excellent oral hygiene with brushing and flossing
  • Regular dental check-ups every 6 months

Outcome & Benefits

  • The zirconia crown restored function, strength, and durability of tooth 36.
  • The patient reported improved chewing efficiency and comfort.
  • Aesthetics were maintained with a natural tooth-colored restoration.
  • Long-term prognosis is excellent with proper care.

Conclusion

Tooth 36 restoration with a zirconia crown provided the patient with a reliable, strong, and aesthetically pleasing solution. Zirconia crowns are particularly well-suited for posterior teeth, where chewing forces are high, ensuring both protection of the treated tooth and long-term satisfaction for the patient.

If you have a root canal-treated or damaged tooth that needs restoration, consult your dentist about the benefits of zirconia crowns a modern blend of durability and aesthetics.

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