Journal of Dental Medicine
Year:2018 | Volume:31 | Issue:3 |Papers Count:9

Background and Aims: In endodontically treated teeth, the fiber posts are used to retain a core restoration. The purpose of this study was to evaluate the effect of different resin cements on the bond strength of fiber reinforced composite posts to root canal dentin, and comparing the bond strength in different sections of root. Materials and Methods: In this in-vitro experimental study, 48 extracted single-canal central incisors were endodontically treated. For the push out test, the posts were divided into 3 groups according to one of the following three different cement materials (n=16) (Bifix SE, Bifix QM, Rebilda). Three slices with a thickness of 2-mm were prepared of each root. The push-out tests were performed at a cross-head speed of 1 mm/minute using a universal testing machine. Data were analyzed by two-way and one-way ANOVA test followed by Tukey post hoc test (α =0. 05). Results: There was no significant differences between the mean push out bond strength of three experimental groups (P=0. 650), but there were significant differences between the mean push out bond strength of root dentin regions (P<0. 001). Conclusion: Under the conditions of this study, there was no significant difference between the mean push out bond strength of 3 different resin cement systems. The coronal region of root dentin showed significantly higher mean bond strength values than that of the middle and apical thirds.

Background and Aims: The structural distinction of primary teeth compared to the permanent teeth leads to a faster penetration of the caries into the pulp, which makes effective treatment necessary. The aim of this study was to determine the success rate of pulpotomy in primary molar teeth and its effective factors using formocresol by students and residents at the department of pediatric dentistry of Hamedan dental school. Materials and Methods: In this cross-sectional study, 113 children who previously had pulpotomy by formecresol in their primary molars (30 children by residents and 83 children by the students) were randomly evaluated based on referral time (at least 12 months after treatment) in terms of clinical and radiographic success rates. Data were analyzed by SPSS20 software using Chi-square and descriptive statistics. Results: The success of the pulpotomy of primary molar teeth was 81. 7%. The success rates of the general students and residents were 79. 3% and 87. 3%, respectively. The percentage of successful pulpotomy was significantly higher in general students at Stainless Steel Crown (S. S. C), second molar in maxilla (P<0. 05), but did not have a significant relationship with age and sex (P>0. 05). The percentage of pulpotomy success performed by residents did not have a significant correlation with gender, age, type of repair, type of teeth and jaws (P>0. 05). In general, the percentage of success in S. S. C, the second molar and maxillary jaw was higher. Also, the success rate of pulpotomy by residents was significantly higher than that of general-students (P<0. 05). The highest rates of pulpotomy failure were related to internal analysis. Conclusion: Formocresol pulpotomy using S. S. C in the maxillary second molar teeth had higher success rate.

Background and Aims: The systemic and topical preventive effect of fluoride on tooth decay has been reported. The aim of the present study was to determine the fluoride level in imported and national fluoridated dentifrices in the Iranian market. Materials and Methods: Sampling was randomly performed from the main market centers and pharmacies in Tehran. The total fluoride (TF) and total soluble fluoride (TSF) concentrations were determined by ion specific electrode potentiometer method. The samples were coded and one trained researcher performed the analysis. Descriptive statistics as percentage and analytical statistics reported as independent t-test were reported. Results: In adults’ toothpastes, the total fluoride ranged from 191 to 1601. 9 ppm with the mean of 911. 2 (SD=331. 4) ppm. The total soluble fluoride ranged from 322. 8 to 1518. 8 ppm with the mean of 1021 (SD=279. 8) ppm. In children’ s toothpaste total fluoride ranged from 236. 3 to 1163. 7 ppm and the total fluoride of 594 (SD=375). Total soluble fluoride in children’ s toothpaste ranged 655. 6-1102. 6 with the mean of 879. 1 (SD=316. 07). Analysis of the total fluoride (TF) and total soluble fluoride (TSF) showed that there was no significant difference between the local and imported toothpastes (P>0. 05). Conclusion: The fluoride level of Iranian toothpaste was similar to that of the imported toothpastes, however there was variation in the level of fluoride in products.

Background and Aims: The cell phone has played a significant role in the transmission of microbial contamination as a public tool. The present study was conducted to determine the degree of contamination of mobile phones of students and staff of the dental school of Isfahan University of Medical Sciences. Materials and Methods: In a cross-sectional study, 60 samples were taken from 60 cell phones belonging to students, staff and faculty members of the Isfahan Dental School, the samples were cultured in the laboratory for microbial contamination of the phone. The behavioral characteristics of the subjects were also determined using a cell phone special questionnaire. Data were analyzed by SPSS version 24 using descriptive statistics, one-way AVONA, T-test and Chi square. Results: Among the 60 cultured samples, 11 (18. 3%) did not grow any bacteria. In 31 cases (51. 7%), Staphylococcus epidermidis, 14 cases (23. 3%) Staphylococcus aureus susceptible to methicillin and in 4 (6. 7%) methicillin resistant staphylococcus aurous were grown. The mean of bacteria colonization was 18± 12. 2 and there was not any relation between the colonization and kind of bacteria (P=0. 78) and studied groups (P=0. 43). Also, there was a significant difference between the sanitary conditions and the type of bacteria grown in the culture medium (P=0. 04). Conclusion: According to the results of the study, the cell phones belonging to the students, lecturers and faculty staff were contaminated by harmful bacteria such as staph aurous. These bacteria are the most important of nosocomial infections and may be led to a wide areas of infections from simple to serious types.

Background and Aims: Caregivers’ oral health literacy (OHL) can be effective in increasing their children’ s knowledge, and can improve their oral health-related behaviors. This study aimed to investigate the relationship between mothers’ OHL and children’ s oral health status. Materials and Methods: We conducted a cross-sectional study on 202 6-year child/mother dyads in Semirom, Iran, applying a cluster sampling method. Self-administered questionnaires (Oral Health Literacy-Adult Questionnaire) requested information about mothers’ OHL. Children’ s oral health status (dmft and pufa) was recorded via clinical examination. Pearson correlation coefficient, spearman correlation coefficient, independent T-test, and a linear regression model were used for statistical analysis. Results: Among 202 pre-school children, 99 were girls (49%). The mean OHL score of mothers was 63. 2 (Max achievable score=100, SD=18. 9). Higher score of OHL among mothers was associated with their children’ s less missing teeth (mt) and more filled teeth (ft) (P<0. 05). No significant the association existed between the mothers OHL and their children’ s dt, dmft, and pufa. Childrens of younger mothers, more educated mothers, and those with better oral health behaviors in terms of daily flossing and tooth brushing, showed lower scores of dmft and pufa (P<0. 05). Conclusion: A significant association revealed between mothers’ OHL and the oral health status of their children. Thus, it is recommended to increase mothers’ OHL to improve their children’ s oral health status.

Background and Aims: Color is the most important and complicated part of aesthetic dentistry. The tooth color matching of restorations is considered as one of the most difficult tasks in the restorative dentistry. The aim of this study to evaluate the effect of two training methods on the dental students’ ability in determining tooth color matching. Materials and Methods: In this study, 40 dentistry students participated which randomly allocated into two groups. The first group consisted of students who learned teeth color matching methods practically. In the second group, training booklet was used for learning. Using Vita Classic shade guide series, 4 color samples were chosen and the students of each group were asked to determine samples’ color, before, after and one month after the training. Results: Booklet learning group was more successful in determining fourth color sample. However, in no studied group and no used samples, the results of one month after learning were not better than that of before learning. Also generally, no significant relationship was found between the color matching accuracy, using glasses, and sex of participants. Conclusion: The use of booklet learning was more effective than practical learning in color matching accuracy for dental students. Also, using glasses and sex were not effective on their color matching accuracy.

Background and Aims: Cleft lip and palate is among challenging dentistry problems that calls for a multidisciplinary treatment approach. The treatment protocols in adults aims to improve function, appearance, and psychological conditions. The present article aimed in introducing the procedure of conventional prosthesis application for treatment of an adult patient focusing on complicated intra-operatory challenges. Materials and Methods: A 52-year-old male patient was referred for correcting his functional deficiency resulted from bilateral cleft lip and palate. After surgical stent fabrication and vestibuloplasty, transitional prosthesis was fabricated using “ Melted-sugar method” . Six month later, Richmond copings and fixed prostheses were made and the treatment was completed by delivery of mandibular removable partial prosthesis and maxillary obturator. Finding the correct position of hard palate, not interfering with normal phonetic, and hollowing his obturator, along with stablishing correct vertical dimension were among several challenges call for special considerations. Conclusion: Following sound procedure, the conventional prosthetic treatment could be considered as an acceptable and applicable treatment option for adults suffering from untreated cleft palate, who are not good candidates for more complicated treatment procedures.

The Guided Bone Regeneration (GBR) treatment concept advocates that regeneration of osseous defects is predictably attainable via the application of occlusive membranes, which mechanically exclude non-osteogenic cell populations from the surrounding soft tissues, thereby allowing osteogenic cell populations originating from the parent bone to inhabit the osseous wound. The use of membrane to exclude non-osteogenic cells, is a key principle of guided bone regeneration. A large number of membranes have been evaluated in clinical and experimental studies. The object of this study was to review the literature regarding guided bone regeneration and all types of membranes that were used in this technique. 72 articles between the years 1968 through the 2016 from PubMed, Medline and Google Scholar using the related keywords, were selected. Finally, we concluded that the modification of mechanical and physico-chemical properties of membranes could improve the process of new bone growth. However, determination of the exact role of membrane porosity in this process, still needs to be clarified. Optimization the chemical composition of membrane with the focus and attention to obstructive property and bioactivity, is an important point in this research field. Various factors such as flexibility, mechanical strength and degradation rate determine the type of membrane used for bone tissue regeneration.