Journal of Dental School
Volume:35 Issue: 4, Fall 2017

This study aimed to evaluate the retention of composite restorations of primary anterior teeth reinforced with composite posts, glass fber posts, para-pulpal pins with composite posts, and para-pulpal pins alone.
Forty freshly extracted sound primary canine teeth with at least two-third of the root length remaining were selected. After disinfection, the tooth crown was cut perpendicular to the longitudinal axis. Root canals were prepared and flled using zinc oxide eugenol paste. The teeth were randomly allocated into four groups and restored using one of the following: Composite posts, glass fber posts, parapulpal pins with composite posts, and para-pulpal pins alone. Composite cores were constructed while a preformed U-shaped orthodontic wire was placed in the composite tip, samples were then placed in a universal testing machine for measurement of retention. The minimum force required to dislodge the restoration or cause fracture was considered as the retentive strength. The collected data were analyzed using one-way ANOVA and Tukey’s test (P There were statistically signifcant differences between groups (P = 0.011). The mean retention in the para-pulpal pins with composite post group (131.72 ± 32.35N) was greater than that in composite posts (93.65 ± 24.45N), glass fber post (95.92 ± 25.35N), and the para-pulpal pin group (95.34 ± 29.56N) (P 0.05).
para-Pulpal pin alone may not help in improving the retention of full crown restoration of primary anterior teeth. However, when used along with a composite post, it appears to improve the retention of restoration.

Oral squamous cell carcinoma (OSCC) is among the most common cancers worldwide. This study aimed to assess the expression of CK8 and CK17 by OSCC cell lines in Iranian patients.
This observational study was conducted on three OSCC cell lines with a minimum of 45 passages. Cells isolated from three patients with OSCC were cultured and passaged. Expression of CK8 and CK17 epithelial markers was assessed using reverse-transcription polymerase chain reaction. Data were presented qualitatively.
The results confrmed the expression of CK8 and CK17 mRNA in three groups. Expression of these markers was different in the three specimens based on their degree of malignancy.
Since CK8 and CK17 were expressed in different superfcial and basal layers in the three specimens, epithelial origin of these cells was confrmed. This study can pave the way for further cancer research and designing new treatments.

The frst cause of tooth loss in developed countries is periodontitis and mostly occurs in people over 40 years old.Atorvastatinis a statin drug class, which has a revolutionary impact on the treatment of high cholesterol and also stimulates bone morphogenic protein which has osteogenic potential. The aim of this study was to evaluate the effect of local and systemic Atorvastatin in the treatment of periodontitis.
Forty eight Sprague Dawley rats were randomly divided into six groups of eight in each; experimental periodontitis was induced by ligature in fve of them in each group daily (1) systemic Atorvastatin 12.5 mg/kg (2) systemic solvent (3) local Atorvastatin 0.25 mg/kg (4) local solvent (5) no drug was administered and group (6) left non-ligated, and rats were sacrifced on 11th day. Histopathological analysis on periodontal tissue; malondialdehyde (MDA) and superoxide dismutase (SOD) tests on serum were performed to investigate bone loss and inflammation. The statistical tests for MDA and SOD samples were one-way ANOVA with Duncan post-hoc whereas in histopathological samples nonparametric Kruskal–Wallis and Mann–Whitney tests were used.
Although local injection and oral administration of Atorvastatin signifcantly decreased alveolar bone loss and serum MDA levels, no signifcant difference in their effectiveness was observed. Serum SOD levels were not signifcantly changed in all administered groups.P-value In this study, both local injection and oral forms of Atorvastatin decreased inflammation and bone loss in periodontitis. However, no signifcant difference in their effectiveness was detected. However, local injection is superior to oral form due to effective lower dose.

Considering the gap of information about the perspectives of faculty members regarding the available online scientifc resources, this study aimed to assess the knowledge of Shahid Beheshti Dental School faculty members about open access (OA) electronic journals.
In this descriptive, cross-sectional study, a questionnaire was used to collect information of 68 faculty members of Shahid Beheshti Dental School in 2013–2014. The questionnaire asked for demographic information and contained questions regarding the level of knowledge, use of electronic databases, etc. To assess internal consistency of the questionnaire, in a pilot study, Cronbach’s alpha was considered to be 0.89. Content validity was assessed to determine the validity of the questionnaire. Data were analyzed using SPSS and descriptive statistics, such as percentage, mean, and standard deviation and non-parametric tests, such as binomial, Friedman, Kruskal Wallis, and Mann–Whitney tests.
The mean (±standard deviation) score of acquaintance with OA electronic journals, the mean score of using these journals and the mean score of attitude of faculty members toward these journals were 3.45 ± 0.7, 2.76 ± 0.88 and 3.13 ± 0.4, respectively.
Level of acquaintance of faculty members with OA journals was moderate while their usage was lower than moderate. Their attitude was also moderate. Faculty members must be informed and instructed to use OA journals more frequently.

Dental instruments may serve as a route of infection transmission. The necessity of dismantling of Friction-Style (FS) and SpringStyle (SS) mechanical torque limiting devices (MTLDs) prior to disinfection and sterilization is a matter of debate, aside fromthe fact that it is difcult and time-consuming. This study sought to assess the effect of dismantling of components on quality of sterilizationof MTLDs.
This in vitro experimental study was performed on 96 torque devices. Forty eight FS-MTLDs of two manufacturers (n = 24) namely Astra Tech (Hader SA, La Chaux-de-Fonds, Switzerland) and Dr. Idhe (Dr. Idhe Dental, Eching, Munich, Germany) and 48 SS-MTLDs of two manufacturers (n = 24) namely Nobel Biocare (Nobel Biocare, Goteborg, Sweden) and Straumann (Institut Straumann, Basel, Switzerland). After coding, specimens were inoculated with Bacillus stearothermophilus (PTCC1713) and 24 devices of four manufacturers each were divided into two groups (n = 12) for disinfection in assembled or disassembled form. Each group was then divided into two subgroups (n = 6) for sterilization in assembled or dismantled form. After disinfection and sterilization, bacterial proliferation was assessed for all MTLDs. In case of observing turbidity, Gram-staining and differential tests were performed. The results were expressed as presence or absence of contamination.
Growth of B. stearothermophilus did not occur in any plate (no turbidity). Only one plate showed growth of Staphylococcus saprophyticus.
Dismantling of components had no signifcant effect on quality of sterilization of MTLDs.

Schools are considered as important platforms for oral health promotion worldwide. Oral diseases are preventable and any focus on schoolchildren can minimize suffering, reduce inequity, and create productive years of healthy adulthood later on. Hence, we need to explore oral health promotion methods conducted within the school systems in different countries. This is especially required for developing countries with limited resources.
The PubMed database was searched for English peer-reviewed articles published from January 2000 to June 2017 with available abstracts, specifically focusing on primary school children aged between 7 and 12 years. “Oral health”, “health promotion” and “school” were used as keywords in our search strategy. Relevant papers were selected and reviewed by two independent readers using predefined exclusion criteria, firstly on the basis of abstracts, secondly by assessing full-text papers.
From a total of 257 articles, 22 were eligible for analysis. Of all oral health related activities implemented in schools, oral health education was mentioned in most studies (n=15) followed by supervised tooth brushing program in schools with fluoride toothpaste (n=5), administration of fluoride (varnish/gel) (n=3), provision of nutritious food (n=3), multimedia game or campaign (n=3), and tooth examination with screening (n=3).
Improvement of children’s oral health related to school-based oral health programs is the result of a combination of several interventions. The governments and other policy makers should consider implementing some appropriate health promotion schemes in schools, which take local needs and resources into account.

Case Implant rehabilitation in patients suffering from rheumatoid arthritis (RA) has been reported an improvement in the quality of life. Implanttreatment success depends on many factors like achievement of appropriate osseointegration. There are many controversies about theinteractions between anti-rheumatic drugs and osseointegration. Moreover, the scientifc evidence regarding implant survival in RApatients are scarce. This study presents two case reports including 65- and 51-year-old women who have used low-dose methotrexate andother anti-rheumatic drugs treated by dental implants. After 4-years follow-up, the patients are satisfed of function and aesthetics. Stablebone level was seen around all implants radiographically. Because of the lack of agreement in implant treatment protocol in RA patient,more studies are suggested.