Indian Journal of Dental Research最新文献

Background: The endocrown is described as monobloc ceramic component. The pull-out bond strength acts as a real-life scenario of failure that occurs in endocrown. The different preparation designs have been included to assess the type of preparation that resists the least failure.

Aim: To evaluate the effect of three different types of preparation designs on the pull-out bond strength (PBS) of computer-aided design/computer-aided manufacturing (CAD/CAM) monolithic endocrowns.

Methods and materials: Thirty extracted mandibular first molars were used for this study. Root canal treatment was done. Samples were divided into three groups of 10 samples each. Group A consists of traditional endocrown preparation with a butt joint preparation. The group B consists of a modified preparation with 50-60 degree inward slope. The group C consists of preparation with a 50-60 degree outward slope. Endocrowns were fabricated using CAD/CAM lithium disilicate glass-ceramics. The endocrowns were adhesively bonded to the respective preparations. Pull-out bond strength was calculated using the universal testing machine at a crosshead speed of 1 mm/min.

Statistical analysis: The results were statistically evaluated by one-way ANOVA and Tukey's post hoc analysis.

Results: Group B had higher pull-out bond strength compared to the other two types of preparation designs and showed a statistically significant value with a mean significant difference at 0.05 level (P < 0.05).

Conclusion: The 50-60 degree inward bevel in endocrown preparation increased the pull-out bond strength in lithium disilicate endocrowns.

Context: Some kinds of electrolysed water have been reported to exhibit antioxidant and bactericidal activity. However, studies on the effect of electrolysed hydrogen-rich water (EHW) with a neutral pH on cariogenic bacteria are limited.

Aim: This study aimed to evaluate the feasibility of using EHW as a mouthwash by examining its various effects on cariogenic bacteria.

Materials and methods: To test the bactericidal and anti-biofilm formation effects of EHW on Streptococcus mutans and Streptococcus sobrinus, bacterial growth curves, colony-forming unit (CFU) counts, and crystal violet staining of biofilms were examined after exposing the bacterial pellets to EHW or tap water as a control for one minute. In addition, the expressions of glucosyltransferase and glucan-binding proteins encoding genes were examined using real-time PCR.

Results: Bacterial growth and biofilm formation were inhibited, and the number of CFUs was significantly reduced in the EHW group compared to the control group. The expression of genes encoding glucosyltransferases (gtfB, gtfC, and gtfI) and glucan-binding proteins (gbpC and dblB) were also decreased in the EHW group compared to the control.

Conclusions: Exposing cariogenic bacteria to EHW at neutral pH for one minute can effectively inhibit bacterial growth and biofilm formation in vitro, suggesting that EHW is a promising mouthwash.

Aim: : The aim of this study was to measure the amount of material extruded in the periapical area using three irrigation needles (Max-I-Probe, NaviTip Fx and IrriFlex flexible needle).

Materials and methods: : Mandibular premolars were selected for this study and glass vials were used to gather the extruded debris and they were preweighed. The samples were divided into two groups: Group A (1 mm penetration of needle from working length), which was subdivided into three subgroups: Subgroup A1: Irrigation was made by Max-I-Probe. Subgroup A2: Irrigation was made by NaviTip Fx. Subgroup A3: Irrigation was made by IrriFlex flexible needle. Group B (3 mm penetration of needle), which was subdivided into three subgroups: Subgroup B1: Irrigation was made by Max-I-Probe. Subgroup B2: Irrigation was made by NaviTip Fx. Subgroup B3: Irrigation was made by IrriFlex flexible needle. XP-endo Shaper was used for chemomechanical preparation. After removal from vials, the teeth were incubated and then removed from the incubator and weighed again three times. The average of the readings was taken. Analysis of variance (ANOVA) and least significance difference tests were applied to analyse data.

Results: : All of the needles caused debris extrusion. There was a significant difference between groups (P ≤ 0.001) according to the depth of penetration. The lowest value for debris was observed in subgroup B3 while subgroup A2 had shown the highest mean.

Conclusion: Results revealed that the design and depth of needles significantly affected the debris extrusion. Using more flexible needles and shorter penetration depth for irrigation so that we don't need to push the needles so far apically.

Introduction: Impression making is one such important clinical step, which is critical in the accurate fitting of resulting prostheses. Impression making itself depends on the type of material and the impression technique used to record the details. Various combinations of material and the technique have been described in the literature.

Aim: To evaluate the effect of three different impression techniques on the marginal fit of computer-aided designed/computer-aided manufactured (CAD/CAM) single unit composite fixed dental prostheses (FDP), different consistencies of addition silicone impression material and different tray design were utilized.

Method: Impression of prepared tooth on typodont was made using Matrix impression system, two-step putty wash technique, and individual tooth tray technique. Prosthesis was fabricated using CAD/CAM technology and marginal accuracy was evaluated using scanning electron microscopy (SEM).

Result: In the present study, the matrix impression system resulted in less microgap in both mid-buccal and mid-mesial region, whereas putty wash technique showed very high standard deviation in the interproximal region.

Conclusion: Matrix impression system had the best results at both mid-buccal and mid-mesial position with least marginal discrepancy.

Clinical implication: The findings of this study could be used by clinicians to help them choose the viscosity of polyvinylsiloxane material and impression techniques for FDP that will result in high-accuracy impressions and well-fitting prostheses.

Background: Global prevalence of diabetes is rapidly increasing with an estimate to affect 593 million worldwide by 2035. Current evidence clearly states an association between oral diseases and diabetes mellitus with manifestations like periodontitis, peri-implantitis, xerostomia, etc. Despite this obvious link, knowledge, awareness and attitude of general population towards this are not fully understood.

Aims: To assess public knowledge and awareness on association between diabetes and oral health and assess their attitude towards oral hygiene care and maintenance.

Methods and materials: A three-part structured questionnaire was developed with multiple choice questions and circulated among patients visiting a private dental college. A total of 502 questionnaires were evaluated, and results were statistically analysed.

Statistical analysis used: Student-t test and Chi-square test using SPSS software.

Results: Majority of the participants were male and lived in urban area. 41.8% respondents had diabetes, out of which 86.7% had no awareness of the type. A significant number of non-diabetic individuals had awareness of excessive sugar intake as a cause of diabetes. Greater number of diabetic patients (96.7%) reported dry mouth, whereas only 53.3% had periodontal complications. 90% participants use tooth brush as oral hygiene aid. Only 10.6% participants follow regular dental visits. Majority of subjects (60.6%) listed their friends and family as major source of information.

Conclusion: More people are aware of systemic complications of diabetes as compared to oral problems. A better interdisciplinary relationship is required among dentists and physicians to improve knowledge and awareness of general population.

Noncooperative behaviour faced by a paediatric dentist is the most common attribution towards behavioural manifestations of anxiety in children, and it had been observed that these relationships are long-deterministic and form part of the aforementioned belief system of the child. Forehead and Long in their study found that most uncooperative behaviour of the child is due to their strong will and these children are generally confident, persistent and independent. A fruitful method to deal with strong willed children is to violate the causal relationship by some magic tricks from preventive via curative to his/her follow ups visits. Tricks can be applied at three levels of their visit. Level 1 is preoperative tricks, which includes the preventive measures that teach and educate children for good oral health. Level 2 is operative tricks, which involves child preparedness for successful dental procedures. Level 3 is postoperative tricks, which involve positive reinforcement for regular follow ups. The purpose of this review is to make paediatric dentists think like magicians by using the science behind the magic and applying it in their practice for creating a positive attitude of a child toward dentistry and better procedural experience.

Background: In randomised controlled trials (RCTs), the application of a test of significance to compare the baseline differences between the intervention groups is a common practice, though it has been condemned by many researchers.

Objective: This study aimed to assess the proportion of RCTs on human participants comparing the baseline differences between intervention groups using the test of significance in nine dental specialty journals published in India and to estimate the proportion of studies reporting baseline demographic and clinical characteristics in a table.

Materials and methods: RCTs published in nine dental journals published by dental specialty associations of India were screened. A literature search was limited to the time duration of five years from 2017 to 2021.

Results: The authors analysed 326 RCTs. Of 326 RCTs published, 237 RCTs (72.7%) did not report the baseline demographic and clinical characteristics table. Tests of significance were applied to compare baseline differences between the intervention arms in 148 (45.4%) RCTs published.

Conclusions: Although criticised by the Consolidated Standards of Reporting Trials (CONSORT) statement, the majority of the trials published in dental specialty journals failed to avoid comparison of baseline differences with significance test and failed to report baseline characteristic table.

Background: Irreversible hydrocolloid materials are widely used for both diagnostic and definitive impression procedures. Impressions can be disinfected by immersion or spraying in any compatible disinfectant. Disinfectants should not adversely affect the dimensional stability of the impression and physical properties of impression material and subsequent dental cast.

Objective: The study aims to evaluate the efficacy of a hypochlorous disinfectant solution mixed with irreversible hydrocolloid on setting time, antibacterial efficacy, and dimensional stability.

Methodology: Three groups were made with one control group and three alginate impression was made for each participants in the maxillary arch with 24-hours intervals between one another using the same brand of commercially available chromatic alginate. The working and setting time were noted. Bacterial swabs were collected using a dry sterile cotton swab in the mid palatal region. Dental casts were made using type III gypsum.

Result: The working and setting time had significant differences whereas the dimension among the cast has no significant difference. Microbial growth analysis had distinct differences among the groups.

Conclusion: The self disinfection method using a pioneer solution of hypochlorous HOCl (100 ppm) to mix the alginate impression material rather than the water with the same powder-liquid ratio prescribed by the manufacturer had the same dimensional stability with improved antimicrobial action.

Introduction: Incidence of mucormycosis has increased recently due to rapid spread of coronavirus disease 2019 (COVID-19), which is a hyper-ferritemic state paving a way for easy growth of mucor species. COVID-19 infection results in an immunocompromised state due to the steroid therapy administered to patients and the infection itself. The presence of co-morbidities makes patients more susceptible to acquire mucor infection. Mucormycosis spreads rapidly, associated with aggressive angioinvasion, leading to ischemic necrosis of surrounding tissues. Due to its rapid spread and angioinvasion, mucormycosis is associated with increased mortality and morbidity.

Treatment planning: Early diagnosis and proper treatment planning are crucial to prevent further spread of infection, where dentists play an important role.

Discussion: This case series is mainly focused on patients reported to the oral medicine department with complaints of discomfort or mobility of teeth in the maxillary region while explaining the role of dentists in diagnosing and treating the disease.

Fibromyxoma is a locally aggressive rare benign tumor of mesenchymal origin with or without odontogenic epithelium. The etiology of this tumor remains unknown and it is responsible for approximately 3-8% of all cysts and tumors. Another locally destructive benign lesion is central giant cell granuloma (CGCG) which contains osteoclast-like multinucleated giant cells. CGCG accounts for about 7% of all benign jaw tumors, which usually affects younger females. A hybrid lesion with histologic features of both central fibromyxoma and CGCG has not been reported in the literature so far. In the present article, we report the first case of a hybrid tumor comprising odontogenic fibromyxoma with CGCG in a female along with a brief review of its clinical presentation, radiographic features, histological features, and management.