Grinspan’s Syndrome: A Rare Case with Malignant Transformation

Aim. Oral lichen planus (OLP) is one of the common chronic inflammatory, noninfectious, and precancerous oral mucosal diseases that affect the stratified squamous epithelium in adults. Grinspan et al. reported an association of OLP with diabetes mellitus and vascular hypertension and called that Grinspan’s syndrome in 1966. We aim to present a case of Grinspan’s syndrome with malignant transformation. Case Presentation. A 60-year-old man who presented with a ten-year history of OLP diagnosed clinically and histologically was referred to our otolaryngology department with a painless swallowing in the left buccal mucosa for 3 months. Clinical examination revealed several plaques, striated white lesions in the buccal mucosa bilaterally, and an exophytic tumor in the left buccal mucosa. Histopathological examination showed lichen planus bilaterally and oral squamous cell carcinoma in the left buccal mucosa. The tumor had been developed on the preexisting areas of lichen planus which had been histologically proven before. The tumor was removed completely, and the tissue defect on the buccal mucosa was repaired with a split-thickness skin graft. Conclusion. Patients with OLP should be followed up periodically in a long term at close intervals for early diagnosis of malignant transformation

Evaluation of the Possible Neurotoxic Effect of the Bone Cement on the Facial Nerve: An Experimental Study

Objectives To investigate neurotoxic effect of bone cement (BC) on facial nerve by using electrophysiological and histopathological methods. Methods This study included 20 male albino Wistar rats, divided into four equal groups. Group A was designed as the control group, while group B was sham group. In the group C, BC solution was dropped onto the facial nerve trunks of rats and washed with physiological saline after 5 seconds. In the group D, BC solution was dropped onto the facial nerve trunks of rats and after allowing 5 minutes to dry, wounds were closed. Pre- and postoperative (on 4th week) evoked electromyography (EMG) measurements were done. For histopathological assessments, the rats were euthanized and tissue samples of facial nerve and surrounding areas were collected. Results According to the wave amplitude levels of evoked EMG, postoperative amplitude levels of group D were significantly decreased, compared to preoperative amplitude levels (P=0.043). We found no statistically significant difference in inflammation among the groups. In none of the groups, foreign body reaction and granulation tissue were not detected in any of the groups. In addition, degeneration in axon, myelin, or perineural nets was not detected in any of the groups. Conclusion This study results suggest that BC has no direct toxicity on facial nerve, while it has indirect effects, by decreasing amplitude. Therefore, we conclude that direct contact of BC with nerve should be avoided, and the area should be cleaned by aspiration or washing with physiological saline in case of contact

Antimicrobial Activity of Garlic Derivatives on Common Causative Microorganisms of the External Ear Canal and Chronic Middle Ear Infections

Objective:Today, antibiotic resistance is increasing and evolving into an important health problem. Therefore, it is important to research on alternative therapies to antibiotics. This study aimed to investigate the inhibitory effect of four garlic derivatives on microorganisms commonly isolated in ear infections.Methods:The antimicrobial activities of allicin, s-allyl cysteine (SAC), diallyl disulfide (DADS), and s-allyl mercaptocysteine (SAMC) were investigated on standard strains of commonly isolated microorganisms using the broth microdilution method. The test strains were selected among the microorganisms responsible for chronic suppurative otitis media and otitis externa. These microorganisms were Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Acinetobacter baumannii, Staphylococcus aureus, Enterococcus faecium, Candida albicans, and Candida tropicalis.Results:Minimum inhibitory concentration (MIC) values of allicin and SAC ranged from 0.125 to 20 μg/ mL for fermentative bacteria (E. coli and K. pneumoniae), 20 to 80 μg/mL for non-fermentative bacteria (P. aeruginosa and A. baumannii), 5 to 10 μg/mL for gram-positive cocci (S. aureus and E. faecium), and 40 to 80 μg/mL for yeasts (C. albicans and C. tropicalis). MIC values of DADS ranged from 40 to 80 μg/mL for fermentative bacteria, 40 to 160 μg/mL for non-fermentative bacteria, 40 to 80 μg/mL for gram-positive cocci, and 20 to 40 μg/mL for yeasts. The MICs of SAMC were >640 μg/mL for the tested bacteria and yeasts.Conclusion:Both allicin and SAC showed antimicrobial activity against the tested microorganisms, even at low concentrations. These two derivatives may be used to treat infections in the future

Grinspan’s Syndrome: A Rare Case with Malignant Transformation

Aim. Oral lichen planus (OLP) is one of the common chronic inflammatory, noninfectious, and precancerous oral mucosal diseases that affect the stratified squamous epithelium in adults. Grinspan et al. reported an association of OLP with diabetes mellitus and vascular hypertension and called that Grinspan’s syndrome in 1966. We aim to present a case of Grinspan’s syndrome with malignant transformation. Case Presentation. A 60-year-old man who presented with a ten-year history of OLP diagnosed clinically and histologically was referred to our otolaryngology department with a painless swallowing in the left buccal mucosa for 3 months. Clinical examination revealed several plaques, striated white lesions in the buccal mucosa bilaterally, and an exophytic tumor in the left buccal mucosa. Histopathological examination showed lichen planus bilaterally and oral squamous cell carcinoma in the left buccal mucosa. The tumor had been developed on the preexisting areas of lichen planus which had been histologically proven before. The tumor was removed completely, and the tissue defect on the buccal mucosa was repaired with a split-thickness skin graft. Conclusion. Patients with OLP should be followed up periodically in a long term at close intervals for early diagnosis of malignant transformation

Evaluation on Shear Bond Strength of Different Glass Ionomer and Hydroxy Apatite Cements Used in Ossiculoplasty

Background: Glass ionomer cements (GIC) have been widely used in dentistry for many years. In recent years, GIC have also been used for ossiculoplasty. The bond strength of GIC used in ossiculoplasty and the way they may change over the years in the cementation area are being questioned. The bonding strength of the substance may be of importance for long-term outcomes. Aims: The aim of this study was to investigate the bond strength of different GIC on ossicles. Study Design: In vitro study. Methods: Twenty ossicles were obtained from patients who had undergone ear surgery. All specimens were randomly divided into four subgroups. All specimens were inserted into a specially designed apparatus for shear bond strength (SBS) testing. The tested materials [Aqua Meron (AM), Aqua Cem (AC), Ketac Cem (KC), and Otomimix CPB (OH)] were prepared and applied according to the manufacturer’s instructions. The SBS was tested using a universal testing machine at a crosshead speed of 0.5 mm/min. Results: The mean SBSs were found to be 13.28 MPa, 23.43 MPa, 8.51MPa, and 1.78 MPa for AM, AC, KC, and OH, respectively. AC had the highest SBS, which was statistically significantly different from that of KC and OH (p<0.05). Both AM and KC had higher SBS than OH (p<0.05). Conclusion: The results obtained in this study by investigating the bone-bonding strength of cements widely used in ossiculoplasty demonstrate that some of these substances have a greater ability to bond to ossicles compared to others. Further clinical investigations are needed to test different parameters

DNA methylation in hearing-related genes in non-syndromic sensorineural hearing loss patients

Abstract Background Our understanding of epigenetic modifications in the inner ear is very limited. Although epigenetic regulation of genes related to individual organ- and system-limited pathologies are generally expected to be tissue-specific, DNA methylation patterns in peripheral blood (PB) are found to be associated with the presence of several diseases with no typical hematological involvement. Here, we aimed to investigate whether there is a correlation between hearing-related genes’ promoter region methylation in the PB samples with the presence of non-syndromic sensorineural hearing loss (NSSHL) with an aim of future utilization of DNA methylation as biomarkers in hearing loss. The study included 26 patients with NSSHL and a control group of 20 healthy individuals. CpG islands in the promoter regions of the GJB-2, GJB-6, and SLC24A genes were analyzed using bisulfite sequencing, and methylation percentages were analyzed. Results Methylation levels at the 1st region of GJB-6 and the 1st and the 4th regions of SLC26A4 were found to differ significantly (p = 0.039, p = 0.042, and p = 0.029, respectively) between the patients and the control group. There was no statistically significant difference in methylation percentages of GJB-2 promoters. We also found that parents’ consanguinity determines the methylation levels in patients’ families. Conclusions According to our knowledge, this is the first study that investigates epigenetic changes in the PB of patients with NSSHL. Despite the small sample size, our findings indicate that DNA methylation patterns in the PB could be of use for understanding epigenetic changes in the inner ear and the clinical management of NSSHL