Inlays & Onlays in Townsville
What Is an Inlay or Onlay?
An inlay or onlay is a custom-fabricated dental restoration used to repair a tooth with moderate decay or damage — too extensive for a standard filling but not severe enough to require a full crown. Inlays restore the chewing surface within the tooth’s cusps, while onlays extend over one or more cusps to cover a larger area. According to the Australian Dental Association (ADA), indirect restorations such as inlays and onlays provide superior marginal adaptation and longevity compared to large direct composite fillings. A 2017 systematic review in the Journal of Dentistry reported that ceramic inlays and onlays demonstrate survival rates of approximately 91 per cent over 10 years and 85 per cent over 15 years. At Townsville Dental Clinic, we offer porcelain, composite resin, and gold inlays and onlays to patients across Townsville and North Queensland, tailoring material choice to each patient’s clinical needs and aesthetic preferences.
Sources: Australian Dental Association (ADA); Journal of Dentistry, 2017; Australian Institute of Health and Welfare (AIHW).
When Is an Inlay or Onlay Recommended?
Your dentist may recommend an inlay or onlay in the following situations:
- Moderate tooth decay — the cavity is too large for a direct filling but does not warrant a full crown
- Cracked or fractured tooth — a portion of the tooth structure has broken but the overall structure is sound
- Failed large filling — an existing large filling has deteriorated and requires replacement with a stronger restoration
- Worn tooth surface — the chewing surface has worn down from grinding or erosion
- Preserving tooth structure — when removing as little healthy tooth as possible is a clinical priority
The goal is to conserve as much natural tooth structure as possible while providing long-lasting protection against further damage.
What Materials Are Used for Inlays and Onlays?
| Material | Durability | Aesthetics | Stain Resistance | Approximate Cost |
|---|---|---|---|---|
| Porcelain (ceramic) | 15–25 years | Excellent — tooth-coloured | Excellent | $1,000–$1,500 |
| Composite resin | 5–10 years | Good — tooth-coloured | Moderate | $800–$1,200 |
| Gold | 20–30 years | Visible — metallic | Not applicable | $1,000–$1,500 |
Porcelain is the most popular choice at our Townsville practice due to its natural appearance, stain resistance, and durability. Composite resin offers a more affordable tooth-coloured option for patients on a budget. Gold remains the most durable material, though it is less commonly requested today due to its metallic appearance.
How Do Inlays and Onlays Compare to Fillings and Crowns?
| Feature | Direct Filling | Inlay / Onlay | Crown |
|---|---|---|---|
| Tooth structure removed | Minimal | Moderate | Significant |
| Strength | Moderate | High | Very high |
| Longevity | 5–10 years | 10–25 years | 10–20 years |
| Appointments required | 1 | 2 | 2 |
| Best for | Small cavities | Moderate damage | Extensive damage |
| Cost per tooth | $150–$400 | $800–$1,500 | $1,200–$2,000 |
Inlays and onlays occupy the ideal middle ground — stronger and longer-lasting than fillings, yet far more conservative than crowns in the amount of healthy tooth structure they preserve.
How Is the Inlay or Onlay Procedure Performed?
1. Examination and Treatment Planning
Your dentist examines the tooth with digital X-rays to assess the extent of decay or damage and determines whether an inlay or onlay is the most appropriate restoration.
2. Tooth Preparation
Under local anaesthesia, the decayed or damaged portion of the tooth is carefully removed. The remaining tooth structure is shaped to receive the custom restoration.
3. Impression and Temporary Restoration
A precise digital or physical impression of the prepared tooth is taken and sent to a dental laboratory. A temporary restoration is placed to protect the tooth while the permanent inlay or onlay is fabricated, which typically takes one to two weeks.
4. Bonding the Permanent Restoration
At your second appointment, the temporary is removed and the custom inlay or onlay is checked for fit, bite alignment, and colour match. Once confirmed, it is permanently bonded to the tooth using a strong dental adhesive.
5. Final Adjustments and Polish
Any final adjustments are made to ensure a comfortable bite, and the restoration is polished to a smooth, natural-looking finish.
How Do You Care for Inlays and Onlays?
Maintaining your inlay or onlay is straightforward:
- Brush twice daily with a soft-bristled toothbrush and fluoride toothpaste
- Floss daily to keep the margins of the restoration clean and free of plaque
- Avoid excessively hard foods such as ice or hard lollies that could chip the restoration
- Wear a night guard if you grind your teeth, as bruxism can reduce the lifespan of any dental restoration
- Attend regular checkups every six months so your dentist can monitor the restoration, surrounding tooth, and gum health
Why Choose Townsville Dental Clinic for Inlays and Onlays?
Our dental team combines precise preparation techniques with high-quality laboratory-fabricated restorations to deliver inlays and onlays that fit accurately, look natural, and last for years. We use digital imaging and carefully selected materials to ensure each restoration preserves maximum tooth structure while providing excellent strength and aesthetics.
Patients across Townsville, Aitkenvale, Kirwan, and the wider North Queensland region trust our clinic for restorative care that balances durability with a conservative approach to treatment. Contact us today to find out whether an inlay or onlay is the right solution for your tooth.
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