title: An alternate method for extracting DNA from environmentally challenged teeth for improved DNA analysis.
abstract: A grinding-free method to extract DNA from teeth via a direct minimal-invasive retrograde approach to the pulp cavity and dentine was compared to a standard grinding/pulverisation method. This alternate method uses endodontic dental files to access the root canals and pulp cavity for tissue and dentine harvest via the apical end of the roots and avoids mechanical damage to the crown and root morphology. In contrast, other methods require pulverisation of the whole root or tooth, transection or destruction of the occlusal surface to gain access to the DNA in the root canals and pulp chamber. This study compared two methods for preparing dentine powder from the roots of environmentally challenged teeth for forensic DNA analysis. We found that although the filing method was more laborious, and produced less dentine powder, the amount of amplifiable DNA per milligram of powder was substantially higher with the filing method compared to grinding the entire root. In addition, the number of short tandem repeat (STR) alleles detected and the peak height ratios of the STR profiles were notably higher. Although several other methods of extracting DNA-rich tissue from the pulp chamber of teeth have previously been reported, the method presented in this study is minimally invasive, thereby allowing the preservation of tooth and crown morphology.
authors.affiliation: Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD 4223, Australia. Electronic address: shereehs@shsu.edu.
authors.forename: Sheree
authors.initials: S
authors.lastname: Hughes-Stamm
authors.affiliation: School of Dentistry and Oral Health, Griffith University, Parklands Dr, Southport, QLD 4215, Australia. Electronic address: f.warnke@griffith.edu.au.
authors.forename: Frauke
authors.initials: F
authors.lastname: Warnke
authors.affiliation: Faculty of Health Sciences and Medicine, Bond University, Gold Coast, QLD 4223, Australia.
authors.forename: Angela
authors.initials: A
authors.lastname: van Daal
mesh_terms: D004247:DNA / Q000302:isolation & purification*; D016172:DNA Fingerprinting / Q000379:methods*; D003786:Dental Pulp Cavity; D003804:Dentin; D053803:Forensic Genetics / Q000379:methods*; D005838:Genotype; D006801:Humans; D013997:Time Factors; D014070:Tooth
chemical_list: D004247:DNA
keywords: DNA extraction; DNA typing; Dentine; Forensic; Teeth