The present study was approved by the Ethics and Human Research Committee of the Universitat de València (UV), with registration number H148473676706. Inclusion criteria were over 18 years of age, one or more teeth that responded negatively to cold sensitivity tests (negative vitality was confirmed by the absence of bleeding after opening), no antibiotics in the last month, no communication between the buccal environment and the pulp chamber. Teeth with periodontal pocket >4 mm, mobility or root fracture were excluded.
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