Avicenna Journal of Dental Research
Volume:14 Issue: 4, Dec 2022

 The oral route is one of the main portals for Helicobacter pylori transmission. The elimination of this bacterial species from the oral cavity might be useful in oral health and decreasing infections due to H. pylori. This study aimed to evaluate the effect of a liquorice-extract-containing mouthwash at different concentrations on the proliferation of H. pylori in vitro.

 H. pylori bacterial species was cultured, and the isolated strains from the specific culture medium were prepared for the welling procedures. The liquorice (Glycyrrhiza glabra) mouthwash at 12.5% and 25% concentrations was added to the case group wells at 1,1/2,1/4,1/8, and 1/16 dilutions. In the control group, regular daily mouthwash containing cetylpyridinium chloride and sodium fluoride components was used. The growth inhibition zones were analyzed in the study groups. The data were analyzed by SPSS and reported using descriptive statistics (means±standard deviation).

 In both the mouthwashes containing 25% and 12.5% concentration, the means of growth inhibition zones at 1, 1/2, 1/4, 1/8, and 1/16 dilutions were larger than those in the control group. Further, the largest growth inhibition zone was seen with the undiluted 25% mouthwash. There were no significant differences in the H. pylori growth inhibition zones between 25% and 12.5% mouthwashes (P=0.14).

 Mouthwashes containing liquorice extracts inhibited the growth of H. pylori more significantly than mouthwash with no liquorice extract. Therefore, it is suggested that liquorice extract-containing mouthwashes be used to prevent H. pylori infections in the oral cavity in clinical studies.

 Nasal septum deviation might disrupt the integrity of nasal septum components, resulting in deformity. Such changes might affect the morphology of adjacent structures. The aim of the present study was to evaluate the dimensions of the palate in subjects with and without nasal septum deviation on cone-beam computed tomography (CBCT) images in an Iranian population.

 In the present cross-sectional study, the CBCT images of subjects with and without nasal septum deviation were evaluated in two groups (n=107) referred to the Department of Oral and Maxillofacial Radiology, Tabriz Faculty of Dentistry in 2017. The presence or absence of nasal septum deviation and its severity were evaluated in association with palatal dimensions. Data were analyzed by SPSS. Independent samples t test was used to compare the dimensions of the palate. Finally, the Mann-Whitney U test was employed to compare palatal arch depth (PAD)/palatal interalveolar length (PIL) ratios.

 There were no significant differences between the two groups in terms of the palatal depth (P=0.967), palatal width (P=0.223), and palatal depth/palatal width ratio (P=0.644). However, the results demonstrated significant differences in palatal depth (P<0.001) and palatal width (P=0.05) between male and female subjects.

 Overall, no significant differences were observed in the dimensions of the palate (depth and width) and their ratios between subjects with and without nasal septum deviation, although greater palatal dimensions (depth and width) were detected in males compared to females.

 This study aimed to evaluate the influence of inlays/onlays and their material on stress distribution in mandibular molars with large cavities, using finite element analysis (FEA).

 3D models of the first mandibular molar were created. Then, a mesio-occluso-distal cavity was created, and cusps were reduced (1.5 mm for buccal cusps and 1 mm for lingual cusps). The restorations were: inlay, onlay that covered buccal cusps (B models), and onlay that covered all cusps (LB models). Inlays and onlays were represented by two materials: nanofill composite resin and polymer-infiltrated ceramic network (PICN). Vertical load of 600 N was applied and von Mises stresses were calculated.

 Inlay models showed higher stress concentration in tooth structures than onlay models. Composite resin inlays and onlays transmitted most of the stress to adjacent structures. On the other hand, PICN inlays/onlays absorbed most of stress and transmitted less stress to dental structures than composite resin restorations. Moreover, stress concentrations in PICN onlay models (B-buccal cusps and LB-all cusps) were similar, while composite resin LB onlay showed higher stress concentration in dental structures than composite resin B onlay.

 Onlays showed better stress distribution than inlays. PICN might be a suitable choice as a restorative material of inlay/onlay for large cavities in molars, while the composite resin is unfavorable material for such restorations in terms of stress redistribution in dental structures.

 To establish a good and effective relationship between a doctor and his/her patient, certain non-verbal standards are as necessary as knowledge and skills. According to evidence, one of these standards may be the dentist’s attire. Therefore, this study aimed to determine the effect of dental students’ dressing on patients’ trust and confidence.

 This cross-sectional descriptive study was performed to evaluate the perception of dental school patients. After reviewing pictures of dental students in six different dress styles, the respondents were asked some questions on their preference for dental students’ attire, as well as several questions targeting patients’ trust and confidence. The collected data were analyzed using SPSS 16.

 In the present study, 169 respondents with a mean age of 27.5 years old were enrolled, including 47% men and 53% women. The included respondents significantly favored male dentists with a long white coat and surgical scrubs and preferred a long white coat with a white scarf for women (P<0.001). They believed that dentists with this attire are more knowledgeable, skilled, and professionally competent, and they were more appealing to share their personal issues with this kind of dentist.

 The respondents preferred dental students in professional attire. Wearing professional dress (a white coat) could have a favorable effect on patients’ trust and confidence.

 This study aimed to evaluate the cone-beam computed tomography (CBCT) technique considering its reliability to diagnose resorption due to maxillary impacted canine.

 In this cross-sectional study, 68 CBCT images were observed by two oral and maxillofacial radiologists. The position of the impacted maxillary canine was assessed, and the severity of root resorption in adjacent teeth was determined in two rounds by viewing. Finally, statistical analyses were performed according to the percentage of agreement, intra-class correlation coefficient, and kappa. The data sheets were filled out by two radiologists who observed the CBCT images in two separate weeks and recorded their opinions about the position of the crown and root of the impacted maxillary canine. Further, four adjacent teeth were examined for root resorption.

 In most cases, no root resorption was observed in the lateral, central, and first premolars; however, the reported percentage of root resorption in the lateral premolar was higher than that of the others, and no root resorption was reported in the second premolars. Agreement on crown and root position was reported to be above 90% in all observations. In addition, the percentage of agreement was 98.5%, 95.6%, 98.5%, and 100% for root resorption, central incisor, lateral incisor, the first premolar, and the second premolar, respectively. Maxillary impacted canines were examined considering root resorption in adjacent teeth using CBCT, and its interpretation was reliable.

 Utilization of CBCT provides a worthy data about the impacted maxillary canine localization and effects on adjacent teeth, for more explanation and treatment of these cases.

 Delay in the processing of photostimulable phosphor storage plates (PSP) is a common occurrence in crowded clinics. Accordingly, the effects of processing delays in different coverages on the image quality of photostimulable PSPs were investigated with Acteon and Digora scanners.

 Three Acteon (group A) and three Digora (group B) PSPs were used in this in vitro study. Each group had three subgroups according to three coverages, including protective box (A1 , B1 ), semitransparent (A2 , B2 ), and original dark case plates (A3 , B3 ). An aluminum step wedge was subjected to constant exposure conditions. The exposed plates were immediately processed with their corresponding scanner device (the golden standard), 5, 10, 20, 30, 40, and 60 minutes after exposure. The average gray level information of the 2nd, 5th, and 8th steps of the Al wedge was considered as the mean gray values (MGVs) of each wedge. The difference between the gray values of the 8th and 2nd steps was measured as image contrast.

 There was a significant difference between the contrast and MGVs of Acteon and Digora PSPs at all processing delay times (P<0.05). In general, there was no significant difference in the image MGVs and contrast between subgroups in any of the scanners (total P>0.05). In each subgroup, MGVs increased, while contrast decreased by increasing the processing delay time; the difference was significant except for the MGVs in the first 5 minutes of A1 (P=0.12) and A3 (P=0.06).

 Thus, the type of scanner was effective on image quality; the type of PSP coating in the first few minutes could affect the rate of image quality loss. However, the scan time had a greater effect on the amount of image loss.

Epidermolysis bullosa (EB) is a spectrum of conditions characterized by mechanical fragility and blistering of the skin. Individuals suffering from EB display a wide range of symptoms based on affected proteins in different organs and tissues in the body, including the craniofacial complex and the oral cavity. In this case-report, a 22-year-old girl with Dominant Dystrophic Epidermolysis Bullosa is presented. She suffered no other medical complication and psychological examination was normal. Atraumatic extraction of hopeless teeth was performed and patient was referred for endodontic treatment of maintainable teeth. Surgical crown lengthening in anterior segments was performed in two sessions with specific precautions to avoid soft tissue trauma and irritation both during surgery and after it. Post-surgery healing was uneventful and acceptable. In conclusion, with a few precautions, surgical crown lengthening can be performed in these patients with minimal soft tissue trauma and optimal healing post-surgery.

A ceramic onlay restoration is a more conservative treatment than full-coverage crowns for endodontically treated teeth (ETT); thus, it helps preserve the tooth structure. Deep margin elevation (DME) is a method to relocate subgingival margins into a more coronal position with resin-modified glass ionomer (RMGI) or direct composite resin before the cementation of the indirect restoration. A 33-year-old male was referred to restore two ETT (teeth N. 46 and 47) with extensive coronal defects extending subgingivally between two teeth. Tooth N. 47 could not undergo a crown lengthening (CL) procedure due to its short root trunk. DME with RMGI was done for both teeth before preparation for ceramic onlays. In this case, by following the principles of biomimetic dentistry, we aimed to restore the tooth defect with a material that bore all functional stresses, in addition to achieving esthetic. It seems that DME in combination with ceramic onlay restoration can be a conservative method to restore ETT in the posterior region. The goal of considering the principles of biomimetic dentistry is to maintain the function of teeth using a good bond to hard tissue that unifies the tooth and its restoration hence distributing the stresses through the tooth as a unit with near-normal functional, biological, and esthetic features.