Journal of oral biology and craniofacial research最新文献

Background: Periodontitis is considered to be one of the major risk factors associated with cancers of the oral cavity. Periodontogenic pathogens such as Porphyromonas gingivalis, Treponema denticola, Tannerella forsythia, Fusobacterium nucleatum and Aggregatibacter actinomycetemcomitans are the important pathogens associated with periodontitis. Chronic exposure to bacterial components induces changes in the nearby cells. Hence, the present study has been designed to identify the molecular mechanisms that could be associated with the two disease conditions viz., periodontitis and head and neck cancer.

Objective: The present study investigated the differential gene expression profile in human gingival keratinocytes treated with P. gingivalis (Pg), a bacterium associated with periodontal disease, and its possible association with the development of Head and Neck Squamous Cell Carcinoma (HNSCC).

Methods: The study followed a computational design. Multiple tools and databases, such as GEOmnibus, STRING, Metascape, PANTHER, and UALCAN, cBioportal, were used to derive an association between gene expression during infection with P. gingivalis, and the resulting gene expression profiles were analyzed in the HNSCC dataset.

Results: The study revealed 29 genes from a pool of transcripts acquired after comparing the Pg-HIGK and Sham-HIGK. Among them, 3 genes i.e., FST, VRK3, and SGK1, were found to be overexpressed and significantly influenced patient survival. The upregulation of FST was found to correlate with poor prognosis in HNSCC patients.

Conclusion: The study provided insights into the possible association of FST, VRK3 and SGK1 in the development of HNSCC. Further investigations are warranted to confirm the functional role of these genes in establishing the cancer phenotype in patients with chronic infection with Pg.

Background: Tooth extraction without socket preservation will lead to reduction in the dimensions and volume of the alveolar bone. Bone defects resulting from tooth extraction not only hinder prosthetic reconstruction but also present aesthetic issues and complicating dental implant treatment. Purple leaves contains flavonoids, steroids, tannins, saponins,and non-toxic alkaloids. These compounds play roles as antimicrobials, immunomodulators, antioxidants, anti-inflammatories, analgesics. Hydroxyapatite has good biocompatibility, and can induce osteoblast differentiation.

Aim: To investigate the effects of the combining nanoemulsion extract of purple leaves and hydroxyapatite on the expression of RUNX2, OSX, OPN, ALP, and calcium deposition.

Method: This research used MTT Assay, ICC, and Alizarin Red staining. The study groups were as follows: Group 1: Ad-MSCs; Group 2: Ad-MSCs + αmem; Group 3: Ad-MSCs + osteogenic medium + 1 % nano-extract of Purple leaves & Hydroxyapatite; Group 4: Ad-MSCs + osteogenic medium + 2 % nano-extract of Purple leaves & Hydroxyapatite. Observations were conducted on days 7, 14, and 21.

Results: The combination of nanosuspension extract of Purple leaves and hydroxyapatite significantly increased the expression of RUNX2, OSX, OPN,ALP and calcium deposition compared to other groups. The combination of nanoemulsion extract of Purple leaves and hydroxyapatite were significant (P < 0.05) compared to the control group on each day 7, day 14 and day 21.

Conclusion: The combination of nanosuspension extract of Purple leaves and hydroxyapatite was able to enhance the expression of RUNX2, OSX, OPN, ALP, and calcium deposition on days 7,14,21.

Aim: Odontogenesis is a complex and highly regulated biological process that involves a range of molecular mechanisms. Among these, Ki67 and Cyclin D1 are crucial cell cycle regulators that play pivotal roles in controlling cell proliferation during tooth development. This study aims to provide detailed insights into the expression patterns and functional significance of Ki67 and Cyclin D1 in tooth development. Through rigorous analysis, we seek to elucidate the intricate mechanisms underlying tooth development, helping to advance our understanding of this vital biological process.

Materials & methods: The procurement of rabbit tooth germ was performed only after obtaining the requisite ethical clearance. Subsequently, the tissues were processed and subjected to Hematoxylin and Eosin staining to facilitate enhanced visualization of the overall tissue architecture and organization & immunohistochemical staining of Ki-67 and Cyclin D1 was performed.

Results: In the tooth germ, cyclin D1 demonstrated intense staining in the dental papilla, especially in the membrana preformativa, with this intensity decreasing following predentin formation. Odontoblasts showed mild staining as they transitioned from pre-odontoblasts, which further diminished after dentin formation. Both the dental papilla and differentiating odontoblasts were positive for Ki67, though Ki67 staining in the odontoblasts reduced after dentin formation.

Conclusion: In conclusion, the membrana preformativa plays a key role in odontogenesis, as indicated by its involvement in cellular proliferation and differentiation during tooth development.

Introdution: Although oral and dental diseases may occur in unexpected or even emergency conditions, but some of the diagnosis and treatments can be algorithmically done following some guidelines. The development and implementation of a system that provides users with a record of history and a proposal of required actions can be not only efficiently practical, but also virtually simple.

Materials and method: A system made up of web and mobile apps is proposed and evaluated for screening and self-care of oral and dental problems and for providing advice on dental emergencies and therapeutic measures. This system was developed and made available to users under the name of 'Dandanyar'. The data were then collected from Dandanyar users and analyzed based on the selected statistical population for evaluating their satisfaction.

Results: The evaluation results showed that more than 90 % of specialists had a positive attitude towards application effectiveness. On the other hand, clients expressed their satisfaction with various aspects of the application in more than 80 % of cases.

Conclusion: The importance of using such systems is highlighted in the Covid-19 pandemic condition where certain health protocols must be followed. For instance, people must avoid unnecessary traveling and limit their referrals to medical centers especially dental clinics due to the high volume of aerosols produced during dental treatment procedures.