.webp)
Class VI fillings are restorations placed on the cusp tips and incisal edges of teeth — the areas that bear the greatest contact force during chewing. The cause of the damage at these sites is almost never decay: it is mechanical wear. Abrasion (from external mechanical forces), attrition (from tooth-on-tooth contact), or a combination of both. Understanding the cause matters because a Class VI filling placed without addressing the cause will fail — the same forces that wore the tooth down will wear the restoration down.
What Causes Cusp and Edge Wear
Bruxism (teeth grinding): The most clinically significant cause of attrition. Grinding during sleep applies forces 6–10 times greater than normal chewing load, concentrated on the biting surfaces and incisal edges. Bruxism-related wear often presents symmetrically — flat biting surfaces on molars and premolars, shortened upper and lower incisors with consistent incisal edge wear. Patients frequently do not know they grind.
Abrasion: External mechanical force removing tooth structure. Aggressive toothbrushing with a medium or hard-bristled brush removes enamel and dentine at the cervical margin and, to a lesser extent, the biting surfaces. Nail-biting, pipe smoking, and occupational habits (holding pins, biting thread) cause localised abrasion at specific teeth.
Erosion with attrition: Acid erosion softens enamel, making it more susceptible to mechanical wear. Patients who grind and also have high dietary acid intake (citrus, carbonated drinks, GERD) experience accelerated cusp loss. The two factors amplify each other.
When Class VI Fillings Are Indicated
Not all cusp wear requires immediate restoration. When wear is minor and stable, monitoring with photographs and study models at 6–12 month intervals is appropriate. Restoration is indicated when: wear has progressed to dentine exposure (the yellower, softer layer beneath enamel) and sensitivity is present; cusp structure has been lost to the point where fracture risk is elevated; wear is affecting the bite (vertical dimension loss); or the patient is distressed about the appearance of shortened or flattened teeth.
The critical clinical distinction: Class VI restorations address the symptom (the worn structure). Managing the cause requires a separate intervention — almost always a hard acrylic nightguard for bruxism patients. Placing a Class VI composite without a nightguard for a bruxer typically results in the composite wearing down or fracturing within months.
Material Selection
Nanofill or nanohybrid composite resin: The first-line material for most Class VI restorations. Modern nanofill composites provide excellent wear resistance alongside good aesthetics. Minimal tooth preparation is required; the composite bonds adhesively to the existing tooth structure. Dazzle uses premium composite systems (nanofill formulations) for their superior polishability and wear resistance in high-stress cusp sites.
Glass ionomer or resin-modified glass ionomer: Indicated for cervical Class V lesions adjacent to the cusp area, where moisture control for composite bonding is difficult. Also used in patients with high caries risk, as the fluoride release provides additional protection at the restoration margins.
Ceramic onlay or partial crown: For more extensive cusp loss involving multiple cusps of a posterior tooth, a ceramic onlay provides superior structural support and wear resistance compared to composite. Zirconia or lithium disilicate (E.max) onlays are appropriate depending on the aesthetic zone and occlusal load.
The Procedure
Class VI composite placement requires: moisture isolation (rubber dam where possible, to ensure bonding is not compromised by saliva contamination); adhesive bonding protocol (etch, primer, bond); incremental composite application in layers of 2mm or less, each light-cured; and final shaping and occlusal refinement with articulating paper to ensure the restoration is not in premature contact.
The occlusal check is the most clinically important step. A high contact on a Class VI restoration concentrates bite force on the restoration rather than distributing it across the arch. This leads to early failure. At Dazzle, occlusion is checked immediately after placement and again at the 2-week review.
Managing the Underlying Cause
For bruxism: a custom-fabricated hard acrylic nightguard is prescribed alongside any Class VI restorations. The nightguard covers the restorations during sleep, protecting them from the parafunctional forces that caused the original wear. For abrasion: technique modification (softer brush, lighter pressure) is discussed and demonstrated. For erosion: dietary modification and acid reflux management are addressed with the patient’s physician if GERD is a contributing factor. The biomimetic approach at Dazzle means the cause of damage is always addressed alongside the restoration.
FAQs
Q1: How long do Class VI fillings last?
In patients without bruxism or where bruxism is managed with a nightguard, nanofill composite Class VI restorations typically last 5–10 years. In unprotected bruxers, composite restorations at high-stress sites may fail within 1–3 years. The nightguard is not optional for patients with active bruxism — it is what determines whether the restoration lasts.
Q2: Will composite look natural on my molars?
Modern nanofill composites are shade-matched to the surrounding tooth and, once polished, are not distinguishable from the natural tooth surface in most lighting conditions. On posterior teeth, aesthetics are secondary to durability, but nanofill composites provide both.
Q3: Is the procedure painful?
Class VI composite placement typically requires only topical or light local anaesthesia. The preparation is minimal — often just cleaning the surface and applying the adhesive without drilling. Where dentine is exposed, sensitivity during preparation is possible and local anaesthesia is administered. The post-procedure period is generally comfortable without significant recovery.
Q4: Do I need to replace all worn cusps, or just the ones causing problems?
Not all worn teeth require simultaneous restoration. At Dazzle, the priority is established based on which sites have active sensitivity, fracture risk, or significant vertical dimension loss. Stable wear without symptoms can be monitored. A prioritised plan is discussed at consultation, which may phase treatment over multiple appointments if multiple sites require attention.
