Use of final irrigants MTAD, Salvedora Perscia, Malachite green, and Ti-sapphire laser on push-out bond strength of Zirconia post.

AIM: Evaluation of the push-out bond strength (PBS) of zirconia post-bonded to radicular dentin after using different final irrigants (MTAD, Malachite green (MG), Ti-sapphire laser and Salvadora persica (S.persica). MATERIAL AND METHOD: Forty human permanent single-rooted were decoronated above the cement-enamel junction. An experienced endodontist performed all the root canal instrumentation using ProTaper universal rotary files. Canals were irrigated using 5.25% NaOCl solution followed by EDTA as a final sterilant. Obturation with gutta-percha using AH Plus sealer was performed. Post-space preparation was completed using Gates Glidden and specimens were randomly assigned to four groups based on the final disinfectant received (n=10). Group 1: 5.25% NaOCl + MTAD, group 2: 5.25% NaOCl + MG, group 3: 5.25% NaOCl +Ti-sapphire laser, and group 4: 5.25% NaOCl + S. persica. The chemically polymerized resin was used to lute zirconia posts. PBS and failure mode analysis were performed using a universal testing machine and stereomicroscope at 40X magnification. Data were compared between the two groups with 95% CI using one-way analysis of variance (ANOVA) with the Tukey post hoc test. p=0.05. RESULTS: Group4(5.25% NaOCl+ S.persica) specimens demonstrated the maximum (8.94±0.14 MPa) bond strength. Conversely, the apical third of Group 2 (5.25% NaOCl+ MG) (2.87±0.15 MPa) samples revealed the minimum bond strength scores. Intergroup comparison exposed that Group 1 (1.3% NaOCl+ MTAD), Group 3 (5.25% NaOCl+Ti-sapphire laser), and Group 4 (5.25% NaOCl+ S. persica) at all three-thirds unveiled no significant difference in PBS (p<0.05). CONCLUSION: Ti-sapphire laser and Salvedora Persica possess the potential to be used as a final root canal irrigant to improve the push-out bond strength of zirconia post-to-root dentin.

Push out bond strength of fiber post to radicular dentin using Q-mix, lemon/garlic extract, and riboflavin activated by photodynamic therapy as a final canal irrigant.

OBJECTIVE: The aim of this study was to assess the extrusion bond values of fiber post to radicular dentin when disinfected using different final irrigants lemon garlic extract (LGE), riboflavin (RFP) activated by PDT (photodynamic therapy), and Q-mix 2-in-1. MATERIALS AND METHODS: Forty single-rooted mandibular premolar teeth were decoronated. Endodontic treatment was performed, and the canals were continually irrigated with normal saline, dried with paper points, and obturated. Post space was prepared by removing gutta-percha using peso-reamers. All specimens were randomly allocated into four groups based on the final irrigant used. Specimens in Group 1 irrigated with: 5.25% NaOCl+17% EDTA, group 2: 5.25% NaOCl+Q-mix 2-in-1, group 3: 5.25% NaOCl+RFP, and group 4: 5.25% NaOCl+LGE. Following final irrigation, a fiber post was placed in the canal space and luted. Samples were sectioned and each section was placed in a universal testing machine to assess bond values. Debonded samples were assessed for failure modes, EBS and modes of failure. For comparisons among groups, the one-way analysis of variance (ANOVA) test and the Post-Hoc Tukey HSD test were used keeping the level of significance at p=0.05. RESULTS: The cervical section of samples in group 2 (NaOCL+Qmix) (7.11±0.81 MPa) exhibited the maximum value of EBS. However, the apical section of samples in group 3 (5.25% NaOCl+RFP) (3.33±0.26 MPa) displayed minimum extrusion bond values. Group 3 specimens in which final irrigation was performed with RFP established significantly lower bond integrity values than all the other investigated groups coronal (3.77±0.13 MPa), middle (3.60±0.41 MPa), and apical (3.33±0.26 MPa) (p<0.05). Intragroup comparison analysis, the coronal and middle root sections of all the experimental groups displayed comparable outcomes of EBS (p>0.05). However, near the apical section of the root, the bond strength of all the groups declined considerably. CONCLUSIONS: Q-mix 2-in-1 as the final irrigant displayed the highest extrusion bond strength of fiber-reinforced composite to canal dentin at all three levels coronal, middle and apical. Lemon garlic extract has the potential to be used alternative to ethylene diamine tetra acetic acid as a final irrigant.

Determinants of COVID-19 Vaccine Acceptance among Dental Professionals: A Multi-Country Survey.

PURPOSE: This study sought to investigate the acceptance rate and associated factors of COVID-19 vaccines among dentists and dental students in seven countries. MATERIAL AND METHODS: A structured questionnaire prepared and guided by the report of the SAGE Working Group on Vaccine Hesitancy was distributed among groups of dentists and dental students in seven countries across four continents. RESULTS: A total of 1527 subjects (850 dentists and 677 dental students) participated in this survey. Although 72.5% of the respondents reported their intention to accept COVID-19 vaccines (dentists: 74.4%, dental students: 70.2%), there was a significant difference in agreement between dentists/dental students across countries; generally, respondents in upper-middle-, and high-income countries (UM-HICs) showed significantly higher acceptance rates compared to those in low- and lower-middle income countries (L-LMICs). Potential predictors of higher vaccine acceptance included being a dentist, being free of comorbidity, being well-informed about COVID-19 vaccines, having better knowledge about COVID-19 complications, having anxiety about COVID-19 infection, having no concerns about the side effects of the produced vaccines and being a resident of an UM-HIC. CONCLUSION: The results of our survey indicate a relatively good acceptance rate of COVID-19 among the surveyed dentists and dental students. However, dentists and dental students in L-LMICs showed significantly lower vaccine acceptance rates and trust in COVID-19 vaccines compared to their counterparts in UM-HICs. Our results provide important information to policymakers, highlighting the need for implementation of country-specific vaccine promotion strategies, with special focus on L-LMICs.

Mucormycotic Osteomyelitis Involving the Maxilla: A Rare Case Report and Review of the Literature.

Osteomyelitis is an inflammatory process of bone and marrow contents. These changes in bone are primarily seen in soft tissue followed by calcified tissue. It is an opportunistic infection due to the complication of some other conditions rendering the host susceptible to disease. Consequences of this infection range from draining tract to malignant transformation. Various etiological factors are involved in origin of the disease; among them, fungal origin is rare. Specific feature in fungal osteomyelitis is the involvement of maxillary sinus with a complaint of sinusitis associated with diabetes mellitus. Here, we discuss a case of osteomyelitis with fungal infection involving the maxilla. The patient is under medication for the past five years due to diabetes.

Choroid plexus papilloma of the third ventricle: angiography, preoperative embolization, and histology.

We report a unique case of choroid plexus papilloma of the third ventricle in an 8-month-old girl in which preoperative embolization played a salient role in management. Initial surgery was aborted due to excessive bleeding. Cerebral angiography demonstrated enlarged posterior choroidal arteries feeding the tumor, and intense, persistent tumor staining. These vessels were effectively embolized to stasis with polyvinyl alcohol particles. The patient underwent a second craniotomy and complete resection of the tumor with minimal blood loss. Postsurgical histology showed postembolization iatrogenic intratumoral necrosis.

Calvarial hemangiomas: report of two cases and review of the literature.

BACKGROUND: Primary hemangiomas of the bone are uncommon tumors, accounting for less than 1.0% of all bone neoplasms. These tumors are mostly found in vertebral bodies. Hemangiomas are rarely seen in the calvarium, where their frequency is 0.2% of all bone neoplasms. Because of their infrequent appearance in the skull, vague symptoms, and absence of prototypical radiological findings, these tumors can be missed in many cases or may be misinterpreted as more ominous lesions like multiple myeloma or osteosarcoma. CASE DESCRIPTION: We report two cases of calvarial hemangiomas: one with a single mass on the right sphenoid wing, and another with two similar lesions on the right occipital and left parietal bones. The diagnoses could be established only by histopathologic analysis. CONCLUSION: Histopathologic confirmation of the tumor is the definitive method for diagnosis of intraosseous hemangiomas. Radiological findings are not always characteristic for calvarial hemangiomas. Due to possible complications and the possibility of effective treatment, this lesion should always be considered in the differential diagnosis of skull lesions.

Kaposi's sarcoma in a liver transplant series.

At our center one hundred eighteen patients have received liver transplants between July 1, 1991 and December 10, 1997. We describe the only one of them to our knowledge who developed Kaposi's sarcoma. It was disseminated, involving the gastrointestinal tract, lungs, multiple lymph nodes and peripancreatic soft tissues. She had no cutaneous Kaposi's sarcoma. Her massive gut involvement was not apparent clinically, even by colonoscopic examination with multiple biopsy specimens. She was diagnosed at postmortem examination.