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The study protocol was reviewed and approved by the Research Ethics Committee of Tabriz University of Medical Sciences, Tabriz, Iran (approval code: IR.TBZMED.REC.1401.295). The Research Ethics Committee of Tabriz University of Medical Sciences waived the requirement for written informed consent because the teeth were de-identified and had been extracted for reasons unrelated to this research. All methods were carried out in accordance with the Declaration of Helsinki and relevant guidelines and regulations.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"562"}}