Contemporary Clinical Dentistry最新文献

Background: Stainless steel (SS) orthodontic brackets may have varying corrosion resistance when used with mouthwashes during orthodontic treatment. Studying their effects on orthodontic brackets will be beneficial.

Aim: The study's objective was to analyze the surface characteristics of SS orthodontic brackets and their resistance to corrosion, exposed to chlorhexidine and povidone-iodine mouth rinses - an in vitro and in vivo study.

Materials and methods: The in vitro test: MBT 0.022" slot SS orthodontic brackets were immersed in three groups - Group A - Modified Meyer-Fusayama artificial saliva (AS), Group B - Chlorhexidine, and Group C - Povidone-iodine mouthwash. The in vivo test: Brackets were conventionally bonded on the patient's teeth and divided into Group I - control group, Group II - patients used chlorhexidine, and Group III used povidone-iodine mouth rinse. The corrosion resistance and surface characteristics of SS brackets were determined using scanning electron microscope (SEM), electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy.

Results: Higher corrosion resistance was obtained for brackets immersed in chlorhexidine mouth rinse. The polarization resistance value of the orthodontic SS bracket was 109 MΩ, 1383 MΩ, and 769 MΩ immersed in AS, chlorhexidine, and povidone-iodine mouth rinse, respectively. After surface chemical analysis, XPS data showed the largest intensity peak of metallic chromium (CrO) fresh sample and in the sample immersed in chlorhexidine mouthwash. According to SEM, brackets immersed in chlorhexidine showed a relatively smooth surface.

Conclusion: In this study, chlorhexidine was found to be less corrosive followed by povidone-iodine.

A health-care professional is expected to hone multiple skills that are not limited to possessing medical knowledge and clinical skills. Game-based assessments are an innovative type of assessment method that combines the features of gamification and simulation to revolutionize the delivery of medical education. These assessments have the potential to promote active engagement of students by ensuring sustained interest, which is not possible to accomplish with conventional assessments. Even though game-based assessments have immense scope in medical education delivery and have been linked with multiple merits, there are potential concerns with regard to their implementation in medical institutions. In conclusion, game-based assessments offer an immersive approach to assessing the performance of medical students, especially in the domain of critical thinking and decision-making. However, the process of planning and implementation of game-based assessment has its own share of challenges, and we must adopt a systematic approach to overcome the challenges and benefit students.

Background: The mucogingival conditions associated with the recession defects at the mandibular anterior region, not only make plaque control difficult to be performed by the patient but also pose a problem in passively advancing the tissues at the recipient site. This surgical technique is used to treat multiple recession defects in the mandibular anterior region.

Materials and methods: Twenty-five sites in 17 subjects (11 women and 6 men) underwent modified bridge flap and de-epithelized gingival unit graft (d-GUG) as a single-step treatment modality to cover the denuded root surface, as well as increase the width of keratinized gingiva in recession type 1 gingival recession defects in the mandibular anterior region.

Results: Nearly 60% of sites in our study showed complete root coverage, with a mean root coverage percentage of 88.08%. Furthermore, keratinized tissue width, keratinized tissue thickness as well as vestibular depth showed statistically significant increases as compared to baseline levels.

Conclusion: Thus, the modified bridge flap technique using d-GUG within the limitations of our study design, showed promising results in terms of recession coverage as well as management of the difficult mucogingival conditions at the mandibular anterior region.

Background: External apical root resorption (EARR) is an unfavorable side effect of orthodontic treatment. Orthodontic treatment of patients with increased crowding could lead to the proclination of incisors and proximity of roots to the cortical plates.

Aims: The aim of this study was to evaluate the effects of the proximity of the labial and lingual cortical plates and the inclination of incisors on EARR.

Settings and design: Twenty-six patients (age: 13.39 years) with nonextraction fixed orthodontic treatment were evaluated at pretreatment and posttreatment (52 cone-beam computed tomographies).

Materials and methods: The maxillary and mandibular incisors (416 teeth) were evaluated for the pretreatment predictors such as the labial and palatal (lingual) cortical plate thickness, width of the mandibular symphysis/maxillary alveolus and cancellous bone, position of the root apex in cancellous/cortical bone, and treatment factors such as distance of root to the labial and palatal (lingual) outer and inner cortical plate and incisor inclination.

Statistical analysis used: Statistical analyses were performed with R software at a 0.05 significance level. Each parameter was compared between pretreatment and posttreatment by a paired t-test, and the association to root resorption was performed using a regression model.

Results: Clinically significant (>1 mm) root resorption was observed in 35% of all mandibular incisors and 52% of all maxillary incisors. Width of cancellous bone, position of the root apex in cortical bone, proximity of the root apex to the labial and palatal (lingual) outer cortical plate, lingual inner cortical plate, and proclination of incisors were significant factors associated with EARR.

Conclusions: Proximity to the cortical plates and proclination of incisors are associated with increased EARR.

Background: The scientific literature has studies that assess the influence of erosive challenges with citric acidic drinks and substances on the adhesive bond strength to enamel and dentin, but does not contain information about the influence of regional components of an acidic diet on this process. Thus, this study evaluated the erosive influence of Amazonian tucupi on enamel and dentin microshear bond strength.

Materials and methods: One hundred and sixty-eight healthy bovine incisors teeth were used, divided into 12 groups (n = 14). For erosive cycling, distilled water (negative control), cola-based soft drink (positive control), or tucupi were used, followed by adhesive strategies of (1) etch-and-rinse (conventional) (Adper™ Single Bond 2) and (2) self-etching (Clearfil SE Bond). All specimens were subjected to erosive cycling for 5 days and, after 24 h, composite resin cylinders were built up for the microshear bond strength test. The data showed normal distribution and were analyzed by two-way ANOVA, followed by the Tukey post and test (P ≤ 0.05).

Results: There were no significant differences in enamel (P > 0.05). In dentin, only the groups exposed to cola-based soft drink showed significant differences (P < 0.01). The failure mode showed that Type II (mixed) was predominant (95%).

Conclusion: The erosive challenge with tucupi did not influence the bond strength to enamel and dentin, regardless of the adhesive strategy used.

Ectopic teeth arise from developmental abnormalities and can be supernumerary, deciduous, or permanent teeth. They can cause orofacial pain, swelling, and infection. There is a major paucity in literature about ectopic mandibular third molar (EMTM) and its causes, symptoms, and treatment. We present an unusual case of EMTM in the mandibular subcondylar region and its surgical management. A 58-year-old female reported with complain of pain and swelling in the right preauricular region. On radiographic assessment, the right mandibular third molar was ectopically present in the subcondylar region and associated with a small dentigerous cyst. Complete removal of cystic lining and extraction of EMTM was done under general anesthesia using a retromandibular approach. After surgery, there was a complete resolution of symptoms within 1 month with uneventful healing and no postoperative complications.

Introduction: Osteosarcoma (OS) is a rare and aggressive form of bone cancer that primarily affects the long bones of the body, such as the arms and legs. It is characterized by the uncontrolled growth of malignant cells in the bone tissue, leading to the formation of abnormal and painful bone masses. Steviol glycosides have been widely used as natural noncalorie sweeteners and are the collective name of the sweet substances found naturally in the plant Stevia rebaudiana, which is commonly called Stevia. Our study aimed to analyze the anticancer activity of Stevioside in OS.

Materials and methods: Stevioside was applied to OS cells, and the levels of Bcl xL, Bcl-2, and Bax were then estimated. The results of three separate studies, each carried out in triplicate, were expressed as the mean ± standard errors of the mean (SEM). One-way ANOVA was used for statistical analysis.

Results: The findings showed that the effect of Stevioside on sarcoma osteogenic cells with mean ± SEM as 0.74 ± 0.05, 0.69 ± 0.09, 0.46 ± 0.09 for Bcl-xL gene, 0.98 ± 0.06, 0.58 ± 0.07, 0.5 ± 0.07 for Bcl-2 gene, and 1.2 ± 0.08, 1.45 ± 0.11, 1.67 ± 0.12 for Bax gene, respectively, when treated with untreated control cells.

Conclusion: The study concludes its action against bone OS cells was significant with apoptotic induction. Stevia has a wide range of health benefits as well as being a plant-based diet it has less of side effects and promoting features even by intaking it daily along with other medicines.

This case report details the successful application of nasoalveolar molding (NAM) in a 4-day-old neonate with a complete unilateral cleft lip and palate, showcasing a comprehensive treatment approach involving presurgical NAM and subsequent surgical repair. The NAM technique, pioneered by Barry H. Grayson, utilizes a specialized appliance to shape the alveolar ridge and nasal cartilage concurrently. The case demonstrates favorable outcomes, with the alveolar segments brought closer to normalcy after approximately 4 months of NAM. The patient underwent further surgical repair, as per the protocol emphasizing the interdisciplinary approach in cleft management.

Background: Peri-implant biofilm formation due to local bacterial colonization is one of the important factors for the instability of temporary anchorage devices (TADs).

Aim: The aim of this study was to quantify and compare the colonization of Streptococcus sanguinis on ultraviolet (UV) treated and untreated titanium TADs.

Materials and methods: This prospective, in vivo study included 20 subjects requiring orthodontic treatment with first premolar extraction, followed by retraction of the anterior teeth with absolute anchorage using TADs. TADs were placed interdentally, in the keratinized tissue between the upper second premolar and the first molar on the buccal side, at the mucogingival junction. It was a split-mouth study where one side of TAD was UV-treated for 15 min, and the other side was kept untreated as a control. TADs were removed after 6 months for S. sanguinis quantification on both sides and were compared for biofilm reduction.

Statistical analysis: Statistical software was used to perform unpaired t-tests for the individual samples as well as for comparing total UV-treated and untreated samples. P <0.05 was considered significant.

Results: The mean bacterial count (per ml) was found to be 2.2 × 10⁶ copy numbers and 8.9 × 10⁶ copy numbers in the UV group and untreated group, respectively. The total count of bacteria was found to be less in the UV-treated group compared to the untreated group.

Conclusions: The study concludes that UV photofunctionalization results in a significant reduction of S. sanguinis colony on TADs with reduced chances of failure due to inflammation.