Polymerization shrinkage issues from poor layering technique
What it is
Placing resin composite in a way that increases polymerization shrinkage stress and/or prevents proper adaptation — classically: • Bulk-filling a deep cavity with conventional composite (large volume cured at once). • Using thick increments (too deep for predictable light penetration). • Building increments that bond to too many cavity walls at once (high C-factor situation). This can contribute to gap formation/microleakage, cuspal deflection, marginal staining, postoperative sensitivity, and early restoration failure.
Why it happens
• High C-factor cavity design (e.g., Class I / deep proximal boxes) + large increments → more shrinkage stress concentrated at the bonded interface. • Rushed technique: "fill it in one go" to save time, especially in posterior teeth. • Incorrect increment size/orientation so the composite is effectively locked between multiple bonded walls during curing. • High-intensity/rapid curing without strategy can accelerate early shrinkage force development (material-dependent) and may worsen stress in some situations.
The full clinical mistake entry includes
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- The clinical tip experienced clinicians use
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