Comparative Evaluation of Fracture Toughness and Flexural Strength of Four Different Core Build-up Materials: An In Vitro Study.

AIM: To evaluate and compare the fracture toughness and flexural strength of four different core build-up materials. MATERIALS AND METHODS: A total of 60 samples were divided into four groups (n = 15) group I: dual cure composite resin reinforced with zirconia particles (Luxacore Z), group II: light cure composite resin (Lumiglass DeepCure), group III: zirconia reinforced glass ionomer cement (GIC) (Zirconomer Improved), and group IV: chemically cure composite resin (Self Comp) respectively. All the core build-up materials were manipulated according to the manufacturer's instructions and poured into the mold. A universal testing machine applied a central load to the specimen in a 3-point bending mode. Fracture of the specimen was identified and the reading was recorded by the universal testing machine. The data were analyzed statistically using one-way analysis of variance (ANOVA) and then compared. RESULTS: Group I showed the highest flexural strength (48.65 MPa) among all the groups while group IV showed the lowest flexural strength (17.90 MPa). Group I showed the highest fracture toughness (99.12 MPa) among all the groups while group IV showed the lowest fracture toughness (36.41 MPa.cm-0.5). When mean flexural strength and fracture toughness values of all four groups were compared by using one-way ANOVA, the compared data was highly significant. CONCLUSION: Based on the findings of this study, dual cure composite resin was the material of choice in terms of flexural strength and fracture toughness for core build-up material followed by light cure composite resin. CLINICAL SIGNIFICANCE: The core buildup material serves to strengthen the tooth structure, allowing it to withstand the forces of chewing and preventing the risk of tooth fractures. This material is essential in restoring damaged or decayed teeth, as it provides a stable foundation for further dental work. By reinforcing the tooth structure, the core buildup material ensures that the tooth can function properly and remain healthy for years to come. How to cite this article: Nakade P, Thaore S, Bangar B, et al. Comparative Evaluation of Fracture Toughness and Flexural Strength of Four Different Core Build-up Materials: An In Vitro Study. J Contemp Dent Pract 2024;25(2):191-195.

Enhancement of Odontoblastic Differentiation of Stem Cells from Exfoliated Deciduous Tooth Using N-acetylcysteine-An In Vitro Study.

AIM AND OBJECTIVE: The study was conducted to evaluate the effects of N-acetylcysteine (NAC) on the propagation and differentiation of stem cells from human exfoliated deciduous teeth(SHED). MATERIALS AND METHODS: SHEDs were isolated by explant culture method and characterized for stem cell properties using flow cytometry method. MTT assay and Cell Counting Kit-8 (CCK-8) assay were used to examine the viability and proliferation of the SHEDs. The effects of NAC-induced osteo/odontoblastic differentiation of SHEDs were determined by functional staining for mineralization, and the gene expression of osteo/odontoblastic transcription factors and proteins was evaluated by real-time quantitative reverse transcription-polymerase chain reaction(qRT-PCR) analyses. Protein levels of collagen type 1 (COL1), dentin sialophosphoprotein (DSPP), and dentin matrix acidic phosphoprotein 1(DMP-1) were calculated by the Western blot method to assess the osteo/odontogenic differentiation. RESULTS: SHEDs presented mesenchymal stem cell (MSC)-like characteristics on flow cytometric analysis. The cell viability and metabolic activity of SHEDs were increased with an increase in the concentrations of NAC from 0.5 to 10 nM. However, the concentrations of NAC from 0.5 to 2.5 mM did not affect cell proliferation. NAC incorporated at a concentration of 2.5 mM showed higher mineralization and considerably increased gene expression levels of runt-related transcription factor 2 (RUNX2), COL1A1, DSPP, and DMP-1. It significantly increased the protein expression of odontoblast-related matrix proteins like COL1, DSPP, and DMP-1. CONCLUSION: NAC regulates the healthy propagation of dental stem cells in vitro. Its effects on the differentiation of dental pulp SHEDs remain unidentified. This study explores that NAC can encourage the mineralization of SHEDs and differentiate them into the odontoblastic lineage. CLINICAL SIGNIFICANCE: The results propose that NAC could have a significant pharmacological role in activating and enhancing odontogenic differentiation of dental stem cells and possibly a prospect in regenerative dentistry.

Evaluation of Sealing Ability of Three Root Canal Sealers: An In Vitro Study.

AIM: To evaluate the sealing ability of three different types of sealers using confocal laser microscopy. MATERIALS AND METHODS: Sixty extracted single-root premolars were selected and divided into three groups (20 teeth in each group) according to the type of sealer used, namely, mineral trioxide aggregate (MTA) Fillapex, AH Plus, and Bio C Sealer. Root canal preparation and obturation were done in all the samples. Roots was dissected transversely in apical plane. Percentage of gap from region to canal circumference was calculated using a confocal laser microscope. Samples were subjected to statistical analysis. RESULTS: High dye penetration was seen with AH Plus compared to MTA Fillapex and least with Bio C Sealer. The AH Plus is the best sealer with respect to seal ability of all the three. CONCLUSION: This study helps to appraise the sealing ability of the different types of sealers using confocal laser microscopy which is useful for the success of root canal treatment. CLINICAL SIGNIFICANCE: As sealer has to seal voids, foramina, and canals, it should have good penetration for the success of root canal treatment.

Oral Health-related Quality of Life in HIV: A Systematic Review.

AIM: To systematically evaluate the literature evidence related to oral health and quality of life (QoL) among HIV-positive adults. BACKGROUND: The oral health-related quality of life (OHRQoL) is an essential entity to be measured for understanding the domains affected due to oral health problems. HIV comes with an array of complexities in the oral cavity and is also reflection of the systemic illness of the oral cavity. Hence, it is essential to know the area affected and also the lesions that contribute the most to decrease the QoL in this aspect. A systematic review was carried out in relation to studies across PubMed and Google Scholar regarding HIV and OHRQoL from January 1970 to May 2019. Of the 1,374 articles screened, 11 studies were filtered for the final review. REVIEW RESULTS: The physical domain followed by the psychological domain is the most affected in the HIV-positive patients. The maximum effect is due to dental caries and periodontitis. No studies report about oral substance abuse and its effect. CONCLUSION: Studies are further needed on a larger sample size and on similar scales and parameters to ensure greater evidence for intervention related to areas that should be focused upon for improving the QoL of HIV-positive patients. CLINICAL SIGNIFICANCE: There is a greater need to include quality-based assessment while treating HIV-positive people. Also not just physical indicators like pain or dental caries, even social indicators like mental and social dimensions of a patient's life should be included while deciding the treatment approach.

Evaluation of Eruption Pattern and Caries Occurrence among Children Affected with Fluorosis.

AIM: The aim of this study was to evaluate eruption pattern and occurrence of caries in children affected with fluorosis. MATERIALS AND METHODS: One hundred and fifty subjects (75 each with/without fluorosis) with age group of 7-8 years were selected. Dental fluorosis assessed on the buccal surfaces of the permanent incisors and molars and scored using the Thylstrup and Fejerskov index. The tooth were scored as emerged when at least one cusp of the tooth was visible in the mouth. Caries attack rate in primary and permanent teeth were estimated using DMFS and defs index in fluorosis patient. The findings were subjected to statistical analysis. The data were analyzed using Student "t" test and ANOVA "F" test. RESULTS: There was statistically highly significant difference found in the incidence of occlusal, mesioproximal, and distoproximal caries between fluorotic and nonfluorotic patients (p < 0.001). The result of present study showed a nonsignificant association between fluoride exposure parameter and median emergence ages of permanent incisors and molar teeth. On the other hand, caries occurrence shows a significant association with fluorosis. CONCLUSION: In this study, a significant positive correlation exists in the prevalence of caries and fluorosis. It is concluded that occlusal and proximal caries are less pronounced in fluorosis patients. CLINICAL SIGNIFICANCE: Dental caries is a public health problem. In this study, we study the fluoride effect since the predominant cariostatic effect of fluoride is beneficial in extensive caries reduction without a concomitant risk of dental fluorosis. How to cite this article: Trivedi S, Trivedi A, Banda NR, et al. Evaluation of Eruption Pattern and Caries Occurrence among Children Affected with Fluorosis. J Contemp Dent Pract 2019;20(10):1217-1222.

Study of the Role of Salivary Lactate Dehydrogenase in Habitual Tobacco Chewers, Oral Submucous Fibrosis and Oral Cancer as a Biomarker.

AIM: To evaluate the salivary lactate dehydrogenase (LDH) levels in clinico-pathologically confirmed oral submucous fibrosis (OSMF), oral cancer and clinically diagnosed tobacco pouch keratosis patients. MATERIALS AND METHODS: A prospective, comparative study was carried out in a tertiary healthcare centre located in Loni from October 2013 to January 2014. A total of 120 patients were separated into 4 groups depending upon the clinical diagnosis as follows. Group I: healthy control (with no addictions and diseases). Group II: oral cancer. Group III: oral submucous fibrosis. Group IV: habitual tobacco chewers (tobacco addiction without any disease). Substantiation was done using biopsy. The samples were inspected for salivary LDH levels by the technique in line with the recommendations of the International Federation of Clinical Chemistry with the help of Erba Chem semi auto analyser. RESULTS: The mean salivary LDH levels in the control, oral cancer OSMF and habitual tobacco chewer group were 86.12 ± 7.05 IU/L, 592.09 ± 28.57 IU/L, 350.43 ± 5.90 IU/L and 125.19 ± 13.42 IU/L, respectively. Out of 4 groups, LDH activity was increased in saliva of patients with tobacco pouch keratosis, OSMF, and oral cancer consistently. Notable difference was found in the mean salivary levels of the above groups. Results were subjected to appropriate statistical analysis: one-way ANOVA, Student's unpaired t test for group-wise comparison followed by post hoc Tukey's test. CONCLUSION: We observed congruous higher levels of salivary LDH in oral precancer and cancer, and hence it could be a future marker.

Correlation of Blood Glucose Levels, Salivary Glucose Levels and Oral Colony Forming Units of Candida albicans in Type 2 Diabetes Mellitus Patients.

AIM: The study aims to correlate salivary glucose, blood glucose levels and oral colony forming units of Candida albicans and to evaluate whether saliva can be used as noninvasive means to measure glycemic status in type II diabetics without the need for the invasive procedure. MATERIALS AND METHODS: The study included 100 type II diabetic patients (group I) of both genders with age 40 years and above and100 healthy patients (group II), age and sex matched with the study group. Group I includes uncontrolled and controlled diabetics as groups IA and IB, respectively. Salivary glucose measurement was done using the enzymatic colorimetric method and blood glucose levels measured by doing venepuncture and centrifuged. The oral candidal carriage was calculated by incubation in Sabouraud's dextrose agar supplemented with chloramphenicol and incubated aerobically for 48 hours. To compare the mean values Z test was applied. To determine the relationship between two variables Pearson's correlation coefficient was used. RESULTS: The salivary glucose levels showed a significant correlation with blood glucose levels. The salivary candida carriage was higher in uncontrolled as compared to controlled diabetics and healthy individuals. CONCLUSION: Positive correlation was obtained between salivary glucose and blood glucose in diabetics and candidal carriage has a positive correlation with blood glucose levels. This salivary glucose and blood glucose levels correlation confirms its use to find glycemic status in diabetic patients. CLINICAL SIGNIFICANCE: The positive correlation of salivary glucose with blood glucose shows that it can be utilized as a noninvasive tool for monitoring glycemic status in diabetic patients.

Evaluation of Proliferative Marker Ki-67 in Adenoid Cystic Carcinoma: A Retrospective Study.

AIM: Adenoid cystic carcinoma (ACC) is a malignant tumor of salivary gland origin. Although the histologic appearance of ACC is low grade, management of this malignancy is a distinct therapeutic challenge because of its tendency for perineural involvement and potential for distant metastasis. Ki-67 antigen is expressed during the G1, S, G2 and M phases in the cell cycle but is absent in the quiescent G0 phase in tissue sections. Aim of the study was to review hematoxylin and eosin stained slides in order to confirm the previous histopathological diagnosis as per the criteria given by World Health Organisation (WHO) and to evaluate the expression of cell proliferation marker, Ki-67 antigen in Adenoid cystic carcinoma and correlate the expression of Ki-67 antigen histopathologically with different grades in Adenoid cystic carcinoma. MATERIALS AND METHODS: Tissue samples of 32 cases (12 males and 20 females) were selected from minor salivary glands with age range from 21 to 70 years. Two paraffin-embedded sections of these total 32 cases each of 4 µm thick were cut on a rotary microtome. One section was stained using hematoxylin and Eosin (H&E) and the other was used for Immunohistochemical staining with Ki-67 antigen. RESULTS: Among these 32 cases of Adenoid cystic carcinoma, Histologically 14 (43.75%) tumors were classified in grade I, 8 (25%) were in grade II, and 10 (31.25%) were in grade III. The average percentage of Ki-67 expression was 27.12% in grade I, 34.43% in grade II and 38.45% in grade III. CONCLUSION: Ki-67 immunoreactivity increased with increase in histopathological grades of ACC. CLINICAL SIGNIFICANCE: Since Ki-67 is a useful marker for assessing the proliferative potential of tumors, the prognosis of patients can definitely be predicted.

Prevalence of Periodontitis and Soft Tissue Lesions among Human Immunodeficiency Virus-positive Patients on Antiretroviral Therapy in Raichur Taluk, Karnataka, India.

INTRODUCTION: In countries where human immunodeficiency virus/acquired immunodeficiency syndrome (HIV/AIDS) is widespread and highly active antiretroviral therapy (HAART) medications are too expensive, or patients are failing HAART, oral disease management and risk remain an important issue. AIM: The aim of the study was to evaluate the prevalence of oral mucosal lesions and periodontitis among the HIV-positive adult patients and assess the association of these lesions with age, sex, duration of HIV, time on ART, dietary habits, and oral hygiene habits. MATERIALS AND METHODS: Sample size was 170. Demographic data of the patients along with community periodontal index (CPI) and loss of attachment (LA) were recorded. Oral soft tissue lesions, such as ulcerations, sores, erosions, and fissures were also recorded. The study was carried out in Raichur Taluk, Karnataka, India. Convenience sampling design was followed. Statistical Package for the Social Sciences (SPSS) version 20.0 (Chicago, USA) was used for data analysis. Chi-square test was carried out; p < 0.05 was considered to be statistically significant. RESULTS: There was no association between the oral mucosal conditions and the age and the adverse habits, such as tobacco and alcohol, CD4 count, and the time duration of HIV and ART among these patients. A higher percentage of people with 4 to 5 mm of pockets was seen with those who cleaned their teeth with a finger, which was statistically significant. CLINICAL SIGNIFICANCE: The present study highlights the poor condition of the oral health of these patients and their unmet dental needs.

Evaluation of Effect of Connector Designs in Implant Tooth-supported Fixed Partial Denture: A Two-dimensional Finite Element Analysis.

AIM: The aim of this study was to evaluate the effect of connector designs on scale and distribution pattern of the stress generated in the supporting bone of implant tooth-supported three-unit fixed partial denture in distal extension situation. MATERIALS AND METHODS: Three-unit fixed partial denture geometric models with implant abutment in second molar, pontic in first molar, and second premolar as mesial abutment in distal extension situations were evaluated using a two-dimensional (2D) finite element analysis. Three models were designed and constructed with mesial and distal rigid connectors, mesial nonrigid connector, and distal nonrigid connector respectively, using the software ANSYS, version 10.0 (University Intermediate). The models were analyzed to determine the maximum equivalent von Mises stress at five critical zones (maximum value) under static axial loading (240 N) after meshing and assigning the material properties. RESULTS: The maximum stress concentration values at mesial and distal alveolar crest of the implant-supporting bone were 60.59 and 68.57 MPa, respectively, in Model No 1. The high equivalent von Mises stress concentration values at the mesial and distal alveolar crest of the implant-supporting bone were 1.65 and 0.747 MPa with 0.1 mm vertical movement and 7.88 and 9.34 MPa with 0.5 mm vertical movement of the connector respectively, in Model No 2. The high equivalent von Mises stress concentration values at mesial and distal alveolar crest of the implant-supporting bone were 10.45 and 3.43 MPa with 0.1 mm vertical movement and 4.50 and 5.71 MPa with 0.5 mm vertical movement of the connector respectively, in Model No 3. CONCLUSION: In the supporting bone around the implant in Model No 1, the maximum von Mises stress concentrations were displayed in the crestal zones. In the supporting bone around the implant abutment, the von Mises stress concentrations were minimal toward the apical third zone in all the models. The stress concentrations were minimal in the supporting bone around the implant and the natural tooth in the models with nonrigid connector. CLINICAL SIGNIFICANCE: When implant is used as distal abutment in three-unit implant tooth-supported fixed partial denture with pontic at first molar in distal extension situation, it is recommended to place the nonrigid connector in the mesial side of the distal implant abutment.

Comparative Evaluation of Fracture Strength of Different Types of Composite Core Build-up Materials: An in vitro Study.

AIM: The aim of the study was to evaluate the fracture strength of three types of composite core build-up materials. The objectives were to study and evaluate the fracture strength and type of fracture in composite core build-up in restoration of endodonti-cally treated teeth with or without a prefabricated metallic post. MATERIALS AND METHODS: A total of 60 freshly extracted mandibular premolars free of caries, cracks, or fractures were end-odontically treated and restored with composite core build-up with prefabricated metallic posts cemented with resin luting cement (group I) and without a post (group II). This was followed by a core build-up of 10 teeth each with three different types of composite materials: Hybrid composite, nanocomposite, and ormocer respectively. The samples were mounted on polyvinyl chloride block and then loaded in the universal load frame at 90° to the long axis of tooth. The fracture strength of the samples was directly obtained from the load indicator attached to the universal load frame. RESULTS: Analysis of variance (ANOVA) test revealed that teeth restored with post exhibited highest fracture strength (1552.32 N) and teeth restored without post exhibited lowest fracture strength (232.20 N). Bonferroni's test revealed that values for hybrid composite (Z-100, 3M ESPE) with post, nanocomposite (Z-350, 3M ESPE) with post, ormocer composite (Admira-VOCO) with post, and nanocomposite (Z-350, 3M ESPE) without post were not significantly different from each other. CONCLUSION: Teeth restored with post and core using hybrid composite yielded the highest values for fracture strength. Teeth restored with ormocer core without post exhibited the lowest values. Teeth restored with nanocomposite core without post exhibited strength that was comparable with hybrid composite core but higher than that of ormocer. CLINICAL SIGNIFICANCE: Mutilated endodontically treated teeth can be prosthetically rehabilitated successfully by using adhesive composite core build-up along with post to meet anatomical, functional, and esthetic demands.

Stigma and Discrimination faced by HIV-infected Adults on Antiretroviral Therapy for more than 1 Year in Raichur Taluk, Karnataka, India.

AIM: The aim of this study was to evaluate the stress and discrimination faced by human immunodeficiency virus (HIV)-affected adult patients on antiretroviral therapy (ART) for more than 1 year. MATERIALS AND METHODS: A cross-sectional study was carried out among 170 adults on ART, reporting to the ART center of the District Civil Hospital, for more than 1 year in Raichur Taluk, Karnataka, India. Convenience sampling technique was followed. Descriptive statistics was performed (Chi-square test) using Statistical Package for the Social Sciences version 16.0. RESULTS: A total of 156 (91.8%) patients' families had knowledge about their seropositive status. Seventeen (10.9%) HIV-positive patients reported of change in the attitude of their family members. The main reasons for not revealing the HIV status were the internalized stigma and fear of rejection. Women faced greater discrimination from family, friends, and neighbors than men. CONCLUSION: It is necessary to not undermine the effect of rejection due to HIV. It is the only infection that has so many associated social and psychological norms which we need to tend at the earnest. Till date, there is an existence of condescendence toward treatment approach. CLINICAL SIGNIFICANCE: The presence of stigma and the fear of being discriminated could be a major hurdle in the rehabilitation of these patients into the mainstream society. Furthermore, it serves as an existing challenge to ascertain these individuals to achieve overall health.

Oral Manifestation in Patients diagnosed with Dermatological Diseases.

AIM: This study aimed to estimate the frequency of oral lesions in dermatological diseased patients attending the outpatient department of Pravara Rural Medical and Dental College and Hospital, Pravara Institute of Medical Sciences (Deemed University), Loni, Ahmednagar, Maharashtra, India, and the Department of Dermatology at Medical College, Ahmednagar, Maharashtra, India. MATERIALS AND METHODS: A cross-sectional hospital-based study was conducted in Loni from October 2013 to January 2014. A total of 310 patients (mean age 37.2 ± 16 years, 61.2% males) completed an oral examination and a personal interview. Oral lesions were recorded. Biopsy and smear were used as adjuvant techniques for confirmation. Data were analyzed using Statistical Package for the Social Sciences (SPSS) (version 15.0.1). RESULTS: Of 310 cases (n = 310) observed for skin lesions, 99 cases were psoriasis (31.93%) and 68 cases were lichen planus (LP; 21.9%), followed by herpes zoster in 44 cases (14.1%), herpes simplex in 13 cases (4.1%), pemphigus vulgaris (PV) in 15 cases (4.8%), erythema multiforme (EM) in 8 cases (2.5%), bullous pemphigoid (BP) in 4 cases (1.2%), chicken pox in 3 cases (0.9%), eczema in 52 cases (16.7%), and nutritional deficiency and candidiasis in 2 cases (Table 1). CONCLUSION: The dermatologic diseases studied frequently occur in the oral cavity. Among them, psoriasis was the most common dermatological disease, and LP frequently showed. CLINICAL SIGNIFICANCE: This study also depicts that diagnosis and management of these oral lesions should also be carried out by oral clinicians so as to improve the oral health functioning during the course of the disease. The intraoral examination should be incorporated to the routine of dermatologic assistance as the oral manifestations can represent preliminary signs or can coexist with the diseases.

Assessment of the existing dental education environment at a dental teaching institution.

INTRODUCTION: An important aspect of creating a competent medical practitioner is the teaching-learning environment that shapes the mentality and instigates an urge among the students to learn. To facilitate a motivating learning setup, the faculty members need to inadvertently establish a successful and safe learning environment which is extensively feasible, given that the faculty gets to control their own style of teaching. A lot of research focuses on student's perception of the learning environment, seldom studies have reported the teacher's perspective. This present study focuses on the teacher's side of the story regarding the current scenario of the workplace that is one of the essential factors to alter the approach toward andragogy. MATERIALS AND METHODS: A cross-sectional questionnaire study was carried out using the Assessment of Medical Education Environment by Teachers (AMEET) questionnaire. The AMEET questionnaire was administered to 50 staff members at MA Rangoonwala College of Dental Sciences and Research Centre, Pune. All the participants were assured of confidentiality of their personal details and they all signed a written informed consent before participating in the study. RESULTS: Majority of the participants had a positive attitude which was seen more in the seniors compared to the juniors. The teacher's perception of teaching is that there needs to be a greater emphasis on what the student learns rather than what the teacher does. Junior staff members felt that students do not prepare and come for classes nor are the expected outcomes clear to them. Assignments are also a task for the students that are never on time. CONCLUSION: It was observed that more senior faculties were positive toward the existing education environment. In addition, even though opportunities are available for the staff as well as students for upgrading and imbibing newer information, they were not being benefitted by the same due to underutilization.

Granular cell ameloblastoma: A rare case report and review of literature.

Ameloblastoma is a benign locally aggressive type of odontogenic tumor derived exclusively from the epithelium. Histologically, ameloblastoma is classified into many variants, of which granular cell ameloblastoma (GCA) is a rare type, characterized by nest of large eosinophilic granular cells. This article describes a case of GCA in a 50-year-old female patient with clinical, radiological, and histological features along with a systematic review of the literature.

Actinomycotic osteomyelitis of palate masquerading periapical pathology: A rare case report.

Osteomyelitis is an infection that is challenging to manage due to the poor vascularization of bone that favors the proliferation of microorganisms. We report a case of osteomyelitis occurring in endodontically treated teeth in the maxillary palatal region. Clinically and radiographically, it was initially diagnosed as osteomyelitis and was treated accordingly with antibiotics for 1 year with no reported healing. Later, biopsy was done and the findings were consistent with that of chronic osteomyelitis in association with infection by Actinomyces organisms. Thus, the case highlights the rare occurrence of actinomycotic osteomyelitis in maxilla and the importance of biopsy and histopathology which will help in correct diagnosis and rapid resolution through appropriate antibiotic therapy.

Kerosene: Contributing agent to xylene as a clearing agent in tissue processing.

BACKGROUND: Research methodology in oral and maxillofacial pathology has illimitable potential. The tissue processing involves many steps of which one of the most important step is "Clearing," which is a process of replacing dehydrant with a substance which is miscible with embedding medium or paraffin wax. Xylene is one of the common clearing agents used in laboratory, but it is also hazardous. The main aim of this study is to substitute conventionally used xylene by a mixture of kerosene and xylene in clearing steps without altering the morphology and staining characteristics of tissue sections. This will also minimize the toxic effects and tend to be more economical. MATERIALS AND METHODS: One hundred and twenty bits of tissue samples were collected, each randomly separated into 4 groups (A, B, C and D) and kept for routine tissue processing till the step of clearing; during the step of clearing instead of conventional xylene, we used mixture of xylene and kerosene in 4 ratios ([A-K:X - 50:50]; [B-K:X - 70:30]; [C - Ab. Kerosene]; [D - Ab. Xylene - as control]) and observed for the light microscopic study adopting H and E staining, IHC (D2-40), Special stains (periodic acid-Schiff and congo red) procedure. The result was subjected to statistical analysis by using Fisher's exact test. RESULTS: The results obtained from the present study were compared with control group, i.e., D and it was observed that Groups A and B were absolutely cleared without altering the morphology of tissue and cellular details; optimum embedding characteristics and better staining characteristics were also noted, whereas Group C presents poor staining characteristics with reduced cellular details. Embedded tissues in Group C presented with rough, irregular surface and also appeared shrunken. CONCLUSION: Combined mixture of xylene and kerosene as a clearing agent in different ratio, i.e., Group A (K:X - 50:50) and B (K:X - 70:30) can be used without posing any health risk or compromising the cellular integrity.

Expression of CD105 in tumor angiogenesis a comparative study (ameloblastoma, keratocystic odontogenic tumor and dentigerous cyst).

BACKGROUND: Demonstrate the expression of CD105 (angiogenetic marker) in ameloblastoma (AM), keratocystic odontogenic tumor (KCOT) and dentigerous cyst (DC). MATERIAL AND METHODS: Assessment of microvessel density (MVD) in 70 cases, including 20 KCOT, 20 DC and 20 solid AMs. Assessment of MVD should be done as the mean number of microvessels per high-power-field. RESULTS: AM and KCOT demonstrated a higher mean value of 7.98 (±2.70) and 6.25 (±2.88) respectively while DC demonstrated a lower mean of 3.75 (±1.42). There was no statistically significant difference between AM and KCOT (P > 0.05). The difference between AM and DC; and between KCOT and DC were statistically significant (P < 0.05). CONCLUSION: The present study suggested that angiogenesis may be one of the mechanisms possibly contributing to the different biological behaviors of KCOT, DCs and solid AMs.

A novel method of coating orthodontic archwires with nanoparticles.

BACKGROUND: The major hazard to the orthodontic tooth movement is the friction developing at the bracket wire interface. In the past, there have been various attempts to reduce this friction. We believe that coating the commercially available orthodontic wires with nanoparticles can result in a successful reduction of this friction. The objective of this study is to develop a novel method of coating orthodontic archwires with nanoparticles. MATERIALS AND METHODS: Stainless steel (Ormco, CA, USA), titanium molybdenum alloy (Ormco, CA, USA) and nickel-titanium (G and H Wire Company, USA) orthodontic wires with a rectangular cross-section dimension of 0.019"× 0.025", were selected. The wires were later coated with a uniform and smooth nanoparticle film using 100 ml nanocremics. The coating procedure described in this article is a sol-gel thin film dip coating method. RESULTS: The coating procedure was verified by comparing the surface topography of nanocoated archwires with the commercially available archwires in an environmental scanning electron microscope (ESEM). The ESEM images prove that the surface topography of the coated wires was found to be smoother with less surface deteriorations as compared to the commercially available wires. CONCLUSION: Commercially available orthodontic wires can be successfully coated using a novel method of sol-gel thin film dip coating method.

Detection of Acid Fast Bacilli in Saliva using Papanicolaou Stain Induced Fluorescence Method Versus Fluorochrome Staining: An Evaluative Study.

BACKGROUND: Fifty years after effective chemotherapy, tuberculosis (TB) still remains leading infectious cause of adult mortality. The aim of present study was to evaluate diagnostic utility of papanicolaou (Pap) stain induced fluorescence microscopic examination of salivary smears in the diagnosis of pulmonary TB. MATERIALS AND METHODS: Cross-sectional study of 100 individuals clinically suspected of suffering from active pulmonary TB. Control group - 50 individuals are suffering from any pulmonary disease other than TB such as pneumonia or bronchiogenic carcinoma. Fluorescence microscopic examination of two salivary smears stained by Pap stain and auramine-rhodamine (A-R) stain respectively for each patient. Ziehl-Neelsen stained sputum smear examined under the light microscope for each patient. Culture was done in all the patients for microbiological confirmation. McNemar's Chi-square analysis, Kappa test, and Z-test. RESULTS: The sensitivities of the three staining methods using culture as a reference method were 93.02%, 88.37% and 87.20% for Pap, A-R and Ziehl-Neelson respectively. CONCLUSION: Pap-induced fluorescence of salivary smears is a safe, reliable and rapid method, which can prove as a valuable diagnostic tool for diagnosis of TB.