ePrints@TNMGRM (Tamil Nadu Dr. M.G.R. Medical University)
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A Study on Spectrum of Electrolyte Abnormalities in Classical Dengue Fever and Hyponatremia as a Prognostic Marker in Classical Dengue
No full text
Comparison of Shear Bond Strength between Metal and Ceramic Bracket on Zirconia Surface with Two Different Adhesion Promotors: An Invitro study
No full textAdult orthodontics is a currently emerging trend among publics. Since prosthetic restorations with zirconia crowns are also more frequently seen,so the need to bond orthodontic brackets onto zirconia crowns have become a essential. It is necessary to have a sufficient bond strength for efficient treatment outcome. As studies reporting about bond strengths silane ,when used for bonding orthodontic brackets onto the zirconia surfaces were barely seen, this in vitro study was conducted to evaluate the bond strength of the two different adhesion promotors, namely monobond and 3M ceramic primer used for bonding metal and ceramic brackets to zirconia surfaces.
Zirconia blocks were embedded onto acrylic blocks and orthodontic brackets(metal and ceramic) were bonded on them using two adhesion promoters namely monobond and 3M primer. The bond strengths of the four groups were tested. In addition, the adhesive remnants on the zirconia surfaces upon debonding were also evaluated, using light microscope.
In this study, the results concluded that the mean shear bond strength of monobond showed higher bond strength than 3M primer. The ARI revealed 3M ceramic primer were performed better
A Cross Sectional Assessment of Photographic & Cephalometric Craniofacial Measurements in Dravidian Population
No full textINTRODUCTION:
The cross sectional study was aimed to compare and correlate the craniofacial measurements from cephalometric radiographs & lateral profile photographs in Dravidian population.
MATERIALS AND METHODS:
The cross-sectional study was conducted in the Department of Orthodontics, Vivekananda Dental College for Women, Namakkal district in Dravidian population. The sample consists of 59 untreated patients seeking orthodontic treatment. The sample size calculation was performed with a confidence interval of 95% and 5% of level of precision Participants were selected based on the inclusion criteria and exclusion criteria. The inclusion criteria included, 1) study participants native of Tamilnadu for three generations belonging to the same communities for all three generations were considered as Dravidians, 2) patients with Class I malocclusion with pleasing esthetic profile, 3) age ranging from 18 – 25 years with standardized lateral cephalogram and lateral facial photographs. The exclusion criteria included, 1) Patients with craniofacial anomalies like facial asymmetry, 2) cleft lip and palate, 3) syndromes, 4) chronic medical conditions, 5) scar marks on face, 6) history of facial surgeries, 7) previous orthodontic treatments. A standardized lateral photographs and cephalograms were taken in Natural Head Position with Frankfort Horizontal plane parallel to the floor and maximum intercuspation and lips at rest position. Five angular SNA , SNB, ANB, SN-MP ,FMA and three linear TFH, LFH, Go-Gn were studied in lateral cephalograms. Five angular TN’A’, TN’B’, A’N’B’, FH-MP’, CP-MP’, and three linear TFH’, LAFH’, ML were studied in lateral profile photographs .
STATISTICAL ANALYSIS:
All continuous data were subjected to Shapiro Wilk test for normality. It was found that the data was normally distributed (p > 0.05) and hence parametric tests of significance were used. Correlation between variables were assessed using Pearson’s correlation coefficient test.
RESULTS:
The results showed that the photographic measurements TN’A’, TN’B’, A’N’B’, FH-MP’, CP-MP’ and ML (r=0.391, 0.317,0.147, 0.422, 0.526 and 0.305 respectively) had a positive correlation with its analogous cephalometric measurements. The association was highly significant between SNA and TN’A’ and between SNB and TN’B’ [p<0.001] indicating that photographic measurements TN’A’, TN’B’, A’N’B’, FH-MP’, CP-MP’ and ML can also be used for orthodontic diagnosis and treatment planning.
CONCLUSION:
Profile photographs can also be used reliably as a non-invasive , low cost, feasible method in orthodontic diagnosis, treatment planning and in epidemiological studies and for screening purpose where lateral cephalograms are not available or when radiation exposure needs to be avoided
Evaluation of Smile Characteristics in Various Growth Pattern
No full textAIM OF THE STUDY:
To investigate the dynamic aspect of attractive smile and smile parameters in different growth patterns.
METHODS:
A total of 120 participants ranging in age from 17–25 years were randomly selected and videographic records of smile were obtained. A panel of two orthodontists, two prosthodontists and two laypersons were involved in the selection of attractive smile and the correlation between the three examiners for the perception of attractive smile was assessed. The final sample of 84 participants who are considered to have an attractive smile were grouped into three categories based on clinical FMA into Average, Horizontal and Vertical growth pattern. Upper lip length and lower lip length measurements were recorded and analyzed at rest and upper and lower lip length, upper and lower lip thickness, maxillary incisal display, interlabial gap, intercommissural width, and buccal corridor space were measured and analyzed during smile. Pearson’s chi-square test was done for the perception of attractiveness of smile. Differences among the three groups were subjected to one-way analysis of variance and tukey’s post hoc test.
RESULTS:
Highly significant correlation was observed between orthodontists, prosthodontists and laypersons in assessing attractiveness of smile. (P 0.00). Vertical parameters upper lip length at rest (P , 0.01), upper lip length during smile ( P 0.01) , lower lip length at rest ( P 0.01), lower lip length during smile (P 0.05), lower lip thickness ( P 0.00), were significantly increased in the vertical pattern when compared with the average and horizontal growth pattern, whereas buccal corridor space was significantly decreased in vertical pattern when compared with the horizontal pattern (P 0.03).
CONCLUSION:
Strong correlation was observed between orthodontists, prosthodontists and laypersons perception in assessing attractiveness of smile. Various skeletal patterns exhibit their characteristic smile features
Evaluation of the Antibacterial Efficacy of Probiotics Lactobacillus Rhamnosus, Bifidobacterium Longum Over Calcium Hydroxide as Intracanal Medicament against Enterococcus Faecalis: An In Vitro study
No full textINTRODUCTION:
The long-term success of the endodontic treatment is the ultimate goal of every endodontist. In endodontics, even after the introduction of various new materials,
traditional materials and methods is being used in routine endodontic treatment. The concept of the human microbiome is known to have better results in endodontic therapy
after a few preliminary studies. The new concept of intentional introduction of microorganisms into the root canal and establishment of microbial equilibrium will
decrease the number of pathogenic microorganisms thereby increasing the overall success rate of endodontic therapy. This study was performed to evaluate the use of probiotics
concept in endodontic therapy.
MATERIALS AND METHODS:
Two groups of commercial available probiotics were selected and evaluated based upon numbers and concentration of organisms. Pathogenic test organism was E. faecalis
(WVU Isolate Ef01). Phase 1 of the study was conducted by a disc diffusion assay test to evaluate zones of inhibition (ZOI) in millimeters (mm) of the selected probiotics against
the Enterococcus faecalis. Microorganisms from probiotic samples were extracted via manufacturer’s recommendations and mixed by weight. Thirty (30) microliters were then
placed on sterile discs. Pathogenic organisms were set to a 1 McFarland standard challenge. A two probiotic disc template on blood agar plates were inoculated with
Enterococcus faecalis and incubated at 37° C for 48 hours and 1 week. Phase 2 was conducted by mixing 9 ml of 30% poloxamer 407 and MRS broth in a test tube, together
with two probiotic mixtures and Enterococcus faecalis , set at a 2 McFarland standard. Serial dilutions upto 10 8 was done and the mixture was placed inside root canals and incubated at 37 degree Celsius for 36 hours and evaluated for CFU/ml counts.
RESULTS:
The results of phase one showed that probiotics Lactobacillus rhamnosus and Bifidobacterium longum are effective in fighting against Enterococcus faecalis with the
acceptable zone of inhibition. The results of phase 2 where the probiotics were mixed with novel delivery vehicle poloxamer 407 to find the cumulative effect of the mixture
against Enterococcus faecalis by determining the colony-forming unit, before and after administration of probiotics. The results showed that probiotics Lactobacillus rhamnosus
and Bifidobacterium longum are effective against Enterococcus faecalis with a reduction in the number of colony-forming units after probiotic usage.
CONCLUSION:
Recognizing that probiotics may act differently based on their composition and concentration, this study suggests that organisms such as L. acidophillus, L. rhamnosus,
L.casei and B. Longum are effective for preventing the growth of E. faecalis and C. albicans in vitro against both their planktonic and biofilm morphological stages. Further
evaluations for possible use in treating endodontic infection is suggested and warranted.
Additionally, Phase 2 results of the study suggest that poloxamer 407 could be utilized as an ideal probiotic delivery vehicle when mixed with appropriate probiotics and utilized as an endodontic intra-canal medicament for treating teeth that have presented with nonvital
pulps
