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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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In which of the following situations composites should be avoided:
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The correct answer is  Composites are usually contraindicated in root surface lesions as gap formation is seen as a result of the forces of polymerization shrinkage being higher than initial bond strength.  
Composites are effectively used for pit and fissure sealants, preventive resin restorations and core build ups.