Have you ever felt a sharp pain while chewing or sudden sensitivity to cold, only to find that your tooth looks completely normal? Many patients ignore these symptoms until the discomfort becomes unbearable. At Summirow Dental, we recently treated a patient who visited us with sensitivity and suspected dental caries in the lower right back tooth. Upon careful examination, we diagnosed a cracked tooth, which was successfully restored using SDR (Smart Dentin Replacement) Composite Filling, allowing the patient to preserve their natural tooth without requiring extensive treatment.

Why Does a Cracked Tooth Cause Sensitivity?

A cracked tooth is one of the most challenging dental conditions to diagnose because the crack is often too small to be visible with the naked eye or even on an X-ray.

When a crack develops, it allows the tooth to flex slightly during chewing. This movement irritates the inner pulp tissue, leading to symptoms such as:

  • Sharp pain while biting
  • Sensitivity to cold drinks
  • Occasional discomfort with hot foodsPain that comes and goes
  • Difficulty identifying which tooth is causing the pain

If left untreated, the crack can deepen and eventually reach the pulp, making root canal treatment or even extraction necessary.

Patient's Chief Complaint

Our patient visited Summirow Dental with complaints of:

  • Sensitivity in the lower right back tooth
  • Pain while chewing hard foods
  • Occasional discomfort while drinking cold water
  • Concern about possible dental decay

Although the patient initially believed the problem was a cavity, a thorough clinical examination revealed something different.

Clinical Examination

After performing a detailed examination, we found:

Examination                  Findings

Visual inspection          Fine crack present on the tooth

Caries check                  No deep decay requiring root canal

Bite test                        Pain reproduced during biting

Cold sensitivity test    Mild positive response 

Percussion test            Normal

Radiograph                  No significant periapical pathology

Our Treatment Plan

Since the crack had not extended into the pulp, we recommended:

  • Removal of weak tooth structure
  • Sealing the crack
  • Restoring the tooth using SDR (Smart Dentin Replacement) Composite
  • Final composite restoration to restore normal anatomy

This approach would:

✔ Prevent crack progression

✔ Reduce sensitivity

✔ Restore tooth strength

✔ Preserve maximum natural tooth structure

✔ Avoid unnecessary root canal treatment

What is SDR (Smart Dentin Replacement)?

SDR is an advanced bulk-fill flowable composite specifically designed to replace lost dentin.

Unlike conventional filling materials, SDR offers several advantages:

Excellent Stress Relief

During polymerization, most composite materials shrink slightly.

SDR has a unique stress-relieving chemistry that minimizes shrinkage stress, reducing the chances of post-operative sensitivity and future cracks.

Better Adaptation

Its flowable consistency allows it to adapt exceptionally well to the internal walls of the cavity.

This creates:

  • Better sealing
  • Reduced microleakage
  • Stronger bonding

Increased Durability

SDR provides a stable foundation beneath the final composite layer, making restorations stronger and longer lasting.

Step-by-Step Treatment Procedure

1. Clinical Evaluation

The tooth was carefully examined to determine the location and extent of the crack.

2. Isolation

The tooth was isolated to maintain a dry working field, ensuring optimal bonding.

3. Removal of Weak Tooth Structure

Any unsupported enamel and compromised tooth structure were conservatively removed while preserving as much healthy tooth as possible.

4. Adhesive Procedure

A high-quality dental bonding agent was applied to maximize adhesion between the tooth and restorative material.

5. Placement of SDR Composite

The cavity was restored with Smart Dentin Replacement (SDR) composite.

Its flowable nature allowed complete adaptation to the cavity floor and internal surfaces.

6. Final Composite Restoration

A conventional composite layer was placed over the SDR to recreate:

  • Proper tooth anatomy
  • Natural contours
  • Functional biting surfac

7. Finishing and Polishing 

The restoration was carefully polished to provide:

Smooth surface

Comfortable bite

Natural appearance

Why We Chose SDR Instead of a Conventional Filling

Conventional Composite                     SDR Composite

Higher shrinkage stress                                                                  Low shrinkage stress

Greater risk of postoperative sensitivity                                      Reduced sensitivity

Layer-by-layer placement                                                               Efficient bulk-fill placement 

Less flow into cavity walls                                                              Excellent adaptation

Higher internal stress                                                                     Better stress distribution

For cracked teeth, minimizing internal stress is particularly important because excessive stress can worsen existing cracks.

Benefits of Early Treatment

Treating a cracked tooth early offers numerous advantages:

  • Prevents crack progression
  • Relieves sensitivity
  • Restores chewing comfort
  • Preserves natural tooth structure
  • Avoids root canal treatment when possible
  • Improves long-term tooth survival
  • Restores confidence while eating

What Happens If a Cracked Tooth Is Ignored?

Many patients assume that occasional sensitivity will disappear on its own.

Unfortunately, untreated cracks often worsen over time.

Possible complications include:

  • Deep fracture extending into the pulp
  • Severe toothache
  • Infection
  • Root canal treatment
  • Vertical root fracture
  • Tooth extraction

Early intervention is always the most conservative and cost-effective solution.

Post-Treatment Care

After the restoration, we advised the patient to:

  • Avoid chewing very hard foods for the first 24 hours
  • Maintain good oral hygieneBrush twice daily
  • Floss regularly
  • Attend regular dental check-ups
  • Report immediately if biting pain returns

The Outcome

Immediately after treatment, the patient experienced significant relief from sensitivity.

The restored tooth:

  • Felt comfortable while chewing
  • Showed excellent function
  • Maintained its natural appearance
  • Required no root canal treatment

The patient was delighted that the tooth could be preserved with a minimally invasive procedure.

Signs You Should Never Ignore

Seek dental care if you experience:

  • Sharp pain while biting
  • Sudden sensitivity to cold
  • Pain that comes and goes
  • Tooth discomfort without obvious decay
  • Pain when releasing your bite after chewing

These symptoms could indicate a cracked tooth that requires prompt treatment.

Why Choose Summirow Dental?

At Summirow Dental, we believe in preserving natural teeth whenever possible through minimally invasive dentistry.

Our approach includes:

  • Advanced digital diagnosis
  • Conservative treatment planning
  • High-quality adhesive dentistry
  • Modern restorative materials like SDR Composite
  • Personalized patient care
  • Long-lasting restorations

Early diagnosis combined with advanced materials allows us to provide comfortable predictable, and durable treatment outcomes.

Conclusion

A cracked tooth does not always require aggressive treatment. When diagnosed early, modern restorative materials like SDR (Smart Dentin Replacement) Composite can effectively seal the crack, relieve sensitivity, and strengthen the tooth while preserving its natural structure.If you're experiencing unexplained tooth sensitivity or pain while chewing, don't ignore it. Early evaluation can make the difference between a simple filling and more extensive procedures.

Quick Facts at a Glance

Problem                                                       Solution

Tooth sensitivity                                         Clinical examination

Cracked tooth                                             Early diagnosis

Small crack without pulp involvement    SDR Composite Filling

Severe crack involving pulp                       Root Canal Treatment

Untreated crack                                          Risk of fracture or extraction