Oral Cavity-A Resilient Source for DNA Sampling.

Dear Editor, DNA is a double-stranded structure present inside the nucleus that carries all the inherited genomic information. Dental tissues are excellent sources of DNA as they show resistance to chemical and physical conditions.1 Dental enamel can withstand adverse conditions like humidity, microbial action, and high temperatures, thus preserving the enclosed DNA.2 DNA can be obtained from odontoblastic processes of dentin, cellular cementum, neurovascular tissues of the pulp, radicular canals, periodontal ligament, and alveolar bone.3 A high concentration of DNA is found in the root body, then in the root tip, coronal body, and coronal tip. The pulp is rich in vascularity, which makes it a rich source of DNA. Cementocytes from cellular cementum are one of the DNA sources that are present within the extracellular matrix.4 In addition, the odontoblastic cell processes are rich in mitochondrial DNA (mtDNA).

Use of Toothbrush as a Cost-effective Noninvasive Source of DNA for Molecular Oral Oncology Investigations during COVID Pandemic.

Dear Editor, Oral cancer, specifically oral squamous cell carcinoma (OSCC) has shown to be a major contributor to morbidity and mortality among tobacco/alcohol users.1,2 A prominent area of research in oral oncology is in the development of economical noninvasive screening tools capable of stratifying high-risk individuals, especially among those with associated habits. Cancer cytopathology has developed into a major branch in onco-diagnostics. Its noninvasive nature has led to its acceptance as a screening tool, especially in larger populations. The major hindrance is that medical personnel is often required to collect the sample using cytological tools such as the cytobrush.3.

Used Toothbrush as a Potential Source of Gene Expression Among Subjects With Systemic Disease and Adverse Habits.

Purpose To explore the viability of used toothbrush as a source of gene expression and comparison of the same among tobacco, alcohol, diabetic and hypertensive subjects. Materials and methods Fourteen subjects with a history of type 2 diabetes mellitus (T2DM) and hypertension were allocated to Group I, 14 subjects with tobacco and alcohol habits allocated to Group II and 14 healthy subjects allocated to Group III. Genetic materials retrieved from the used toothbrush of the study subjects were assessed for genetic expression of cyclin-dependent kinase 4 (CDK4), Bcl-2-like protein 4 (BAX), cyclin-dependent kinase inhibitor 2A (CDKN2A), B-cell lymphoma 2 (BCL2), G-protein beta-3 (GNB3), and subunit gene and transcription factor 7-like 2 (TCF7L2) by polymerase chain reaction (PCR). Results BAX gene showed reduced expression in tobacco and alcohol users (p=0.0497). BCL2, CDK4, and GNB3 showed no significant difference in expression in both the groups and with control. CDKN2A was expressed at a lower level in Group I and II participants. TCF7L2 showed higher expression in Group 2 participants (p=0.001). Conclusion The study concluded that used toothbrush is a reliable source for genetic expression. There was no difference in BCL2, CDK4, and GNB3 gene expression between subjects with systemic disease, adverse habits and healthy controls. There is a downregulation of BAX and upregulation of TCF7L2 gene in subjects with adverse habits.

Complete bilateral gemination of maxillary incisors with separate root canals.

Developmental anomalies in the hard tissue are seen frequently in dental practice. Gemination and fusion are the most commonly encountered anomalies, and distinction between the two is always challenging. Gemination, also called double tooth, is an anomaly exhibiting two joined crowns and usually a single root. It represents an incomplete attempt of a single tooth germ to split. It is considered multifactorial in etiology, with genetic and environmental causes. This paper discusses a rare example of bilateral gemination (prevalence 0.04%) of maxillary central incisors with completely separated roots. Multidisciplinary care ensured a successful esthetic and functional outcome.