Publications by authors named "N Dhanesh"

5 Publications

  • Page 1 of 1

Comparative evaluation of three different toothpastes on remineralization potential of initial enamel lesions: A scanning electron microscopic study.

Indian J Dent Res 2020 Mar-Apr;31(2):217-223

Department of Pediatric and Preventive Dentistry, Kannur Dental College, Kannur, Kerala, India.

Background: The early enamel lesions are reversible as it is a process involving mineral transactions between the teeth and saliva.

Aim: To evaluate the efficiency of three different tooth pastes on remineralization potential of initial enamel lesions using Vickers Micro hardness Test and Scanning electron microscopy.

Materials And Methods: Artificial carious lesions were prepared in human enamel with demineralizing solution. The treatment agents included were Colgate sensitive plus toothpaste, Regenerate enamel science™ toothpaste, BioRepair toothpaste and control as Deionized water. All the samples were subjected to treatment solutions as per the pH cycling model for 12 days to simulate the daily oral environment's acid challenge. The remineralization parameters-surface hardness and surface roughness of enamel blocks were evaluated with Vickers indenter and Scanning electron microscope respectively. Statistical Analysis: ANOVA test was used to check mean differences between the groups. Post hoc analysis was done using Tukey's post hoc test. SEM images were graded according to Bonetti et al grading criteria.

Results: As per statistical analysis, maximum remineralization of enamel blocks occurred after applying Colgate Sensitive Plus tooth paste followed by BioRepair tooth paste and Regenerate enamel Science™ toothpaste. Least remineralization potential was shown by control group.

Conclusion: Colgate sensitive plus tooth paste with Pro Argin™ formula can be regarded as a potential remineralising agent. It can be concluded as a noninvasive means of managing early enamel carious lesions.
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May 2020

Antimicrobial efficacy of medium chain fatty acids as root canal irrigants: An in vitro study.

J Indian Soc Pedod Prev Dent 2019 Jul-Sep;37(3):258-264

Department of Conservative Dentistry and Endodontics, PSM College of Dental Science and Research, Thrissur, Kerala, India.

Background: Enterococcus faecalis and Candida albicans are the microbes that are most resistant to elimination by disinfecting agents and are the causative agents for reinfection of the root canal treated teeth. Medium chain fatty acids (MCFAs), which are the main components of coconut oil, are proven antimicrobial agents. Thus, the aim of this study was to evaluate their antimicrobial efficacy against E. faecalis and C. albicans.

Methodology: Ninety extracted single-rooted mandibular premolar teeth were decoronated, biomechanically prepared, autoclaved, and divided into three groups (n = 30): Group A (inoculated with E. faecalis), Group B (inoculated with C. albicans), and Group C (control group). Each group was again subdivided into three groups (n = 10) and irrigated with lauric acid (LA), decanoic acid (DA), and octanoic acid, respectively, for 5 min. Paper point samples were taken from canal walls and transferred into Brain Heart Infusion broth and potato dextrose broth and placed in an incubator at 37°C. The appearance of tubidity was checked at 24, 48, 72, and 96 h using direct contact test. The data were then statistically analyzed using the analysis of variance and Tukey honestly significant difference post hoc tests.

Results: Among the three MCFAs, LA showed the maximum inhibitory against E. faecalis at 24 h and the inhibitory activity decreased considerably at 48, 72, and 96 h. DA was the most effective against C. albicans with a maximum inhibition at 48 h. DA also showed significant substantivity at 72 and 96 h.

Conclusion: Within the limitations of this study, it can be concluded that MCFAs show promising antimicrobial efficacy against E. faecalis and C. albicans.
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November 2019

Comparison of species isolated from children with and without early childhood caries: A descriptive cross-sectional study.

J Indian Soc Pedod Prev Dent 2017 Oct-Dec;35(4):296-300

Department of Pediatric and Preventive Dentistry, Kannur Dental College, Kannur, Kerala, India.

Background: Early childhood caries (ECC) is characterized by the presence of one or more decayed, missing (due to caries), or filled teeth surfaces in any primary tooth, in a child below 6 years of age. Although ECC is primarily associated with high levels of maternal Streptococcus mutans, there has been an increased interest in finding the relationship between oral fungal flora and dental caries.

Objective: The aim of the study is to identify and characterize the Candida species and to compare the candidal isolates in children with ECC and without ECC.

Materials And Methods: The study was conducted on children below 6 years of age, who were categorized into ECC and non-ECC groups of fifty children each. Samples were collected using sterile cotton swabs and were inoculated on Sabouraud's Dextrose Agar and incubated at 37°C for 24 h. Candidal colonies were isolated, species identified and virulence factors tested for both ECC and non-ECC groups.

Results: The candidal carriage among the ECC children was found to be 84%, which was significantly higher than the non-ECC group of 24%. Candida albicans and non-albicans Candida (NAC) were isolated in both ECC and non-ECC groups. Phospholipase production was significantly high in ECC group whereas hemolysin production and germ tube formation showed no significant difference between the two groups.

Conclusion: A significant correlation was found between the presence of Candida and ECC. NAC also plays an important role in the development of ECC. The virulence factors such as phospholipase may be responsible for the pathogenicity of Candida in the development of ECC.
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June 2018

Apical Extrusion of Intracanal Bacteria following use of Two Engine-driven Instrumentation Techniques: An in vitro Study.

J Contemp Dent Pract 2016 Nov 1;17(11):939-942. Epub 2016 Nov 1.

Department of Conservative Dentistry and Endodontics, The Vinayaka Mission's Sankarachariyar Dental College, Salem Tamil Nadu, India.

Aim: The aim of the present study was to compare in vitro the amount of debris extruded apically from extracted teeth, using Twisted files and ProTaper rotary during two different instrumentation systems.

Materials And Methods: Forty-five human single-rooted mandibular premolar teeth were randomly divided into three groups and contaminated with Enterococcus faecalis. The teeth in experimental groups were instrumented until reaching the working length with ProTaper rotary instruments and Twisted files with XSmart and XSmart Dual groups. Debris extruded from the apical foramen was collected into glass vials and the amount of bacteria was calculated. The data obtained were analyzed using Kruskal-Wallis one-way analysis of variance and Mann-Whitney U tests, with p = 0.05 as the level for statistical significance.

Results: The XSmart Dual group extruded comparatively lesser bacteria compared to the XSmart group. Lesser amount of bacterial extrusion was seen when Twisted files were used compared to the ProTaper files (p < 0.05).

Conclusion: Under the circumstances of this in vitro study, it can be concluded that all instrumentation techniques produced measurable apical extrusion of debris. So, it is upon the practitioner to decide which system best fits their individual needs and their level of skill and experience that will provide the best possible endodontic care for our patients.

Clinical Significance: The newer instrument designs, including noncutting tips, different cross sections, radial lands, and variable tapers, are better for the clinicians to improve working safety, to reduce the working time, and to create a greater flare within the preparations.
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November 2016

A combined chloroplast atpB-rbcL and trnL-F phylogeny unveils the ancestry of balsams (Impatiens spp.) in the Western Ghats of India.

3 Biotech 2016 Dec 2;6(2):258. Epub 2016 Dec 2.

School of Biosciences, Mahatma Gandhi University, Kottayam, Kerala, 686 560, India.

Only a few Impatiens spp. from South India (one of the five centers of diversity for Impatiens species) were included in the published datum of molecular phylogeny of the family Balsaminaceae. The present investigation is a novel attempt to reveal the phylogenetic association of Impatiens species of South India, by placing them in the global phylogeny of Impatiens based on a combined analysis of two chloroplast genes. Thirty species of genus Impatiens were collected from different locations of South India. Total genomic DNA was extracted from fresh plant leaf, and polymerase chain reaction was carried out using atpB-rbcL and trnL-F intergenic spacer-specific forward and reverse primers. Thirteen sequences of Impatiens species from three centers of diversity were obtained from GenBank for reconstructing the evolutionary relationships within the genus Impatiens. Bayesian inference analysis was carried out in MrBayes v.3.2.2. This analysis supported Southeast Asia as the ancestral place of origin of extant Impatiens species. Molecular phylogeny of South Indian Impatiens spp. based on combined chloroplast sequences showed the same association as that of morphological taxonomy. Sections Scapigerae, Tomentosae, Sub-Umbellatae, and Racemosae showed Southeast Asian relationship, while sections Annuae and Microsepalae showed African affinity.
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December 2016