Original Article

Role of reinforcement methods in retention of composite restorations of primary anterior teeth

Ghassem Ansari, Hassan Torabzadeh, Beheshteh Malekafzali, Reza Yarmohammadi

Journal of Dental School, Shahid Beheshti University of Medical Sciences, Vol. 35 No. 4 (2017), 5 Esfand 2019, Page 118-121

Objectives This study aimed to evaluate the retention of composite restorations of primary anterior teeth reinforced with composite posts, glass fiber posts, para-pulpal pins with composite posts, and para-pulpal pins alone.

Methods 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 filled using zinc oxide eugenol paste. The teeth were randomly allocated into four groups and restored using one of the following: Composite posts, glass fiber posts, para- pulpal 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 < 0.05).

Results There were statistically significant 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 fiber post (95.92 ± 25.35N), and the para-pulpal pin group (95.34 ± 29.56N) (P < 0.05). Other differences were not significant (P > 0.05).

Conclusion 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.

Expression of CK8 and CK17, specific epithelial markers, by oral squamous cell carcinoma cell lines

Fatemeh Mashhadiabbas, Mozhgan Shavakhi, Hamid Nazarian, Parisa Kardouni Khoozestani, Hamidreza Moslemi

Journal of Dental School, Shahid Beheshti University of Medical Sciences, Vol. 35 No. 4 (2017), 5 Esfand 2019, Page 122-126

Objectives 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.

Methods 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.

Results The results confirmed 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.

Conclusion Since CK8 and CK17 were expressed in different superficial and basal layers in the three specimens, epithelial origin of these cells was confirmed. This study can pave the way for further cancer research and designing new treatments

Effects of local and systemic Atorvastatin on inflammation and alveolar bone loss in experimental periodontitis in rats

Sara Masoumi, Kamran Kouzeforush Abadi, Shahin Setoudehmaram, Nader Tanideh, Bahram Movahedd

Journal of Dental School, Shahid Beheshti University of Medical Sciences, Vol. 35 No. 4 (2017), 5 Esfand 2019, Page 127-132

Objectives The first cause of tooth loss in developed countries is periodontitis and mostly occurs in people over 40 years old.Atorvastatin is 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.

Materials and Methods Forty eight Sprague Dawley rats were randomly divided into six groups of eight in each; experimental periodontitis was induced by ligature in five 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 sacrificed 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.

Results Although local injection and oral administration of Atorvastatin significantly decreased alveolar bone loss and serum MDA levels, no significant difference in their effectiveness was observed. Serum SOD levels were not significantly changed in all administered groups. P-value < 0.05.

Conclusion In this study, both local injection and oral forms of Atorvastatin decreased inflammation and bone loss in periodontitis. However, no significant difference in their effectiveness was detected. However, local injection is superior to oral form due to effective lower dose.

Knowledge of Shahid Beheshti Dental School Faculty Members about Open Access Electronic Journals

Azin Nourian, Elahe Vahid Dastjerdib; Mohammad Hossein Khoshnevisan

Journal of Dental School, Shahid Beheshti University of Medical Sciences, Vol. 35 No. 4 (2017), 5 Esfand 2019, Page 133-137

Objectives It is important to evaluate the gap of information regarding the online scientific resources available to college and university instructors.  The aim of this study was to assess the knowledge of Shahid Beheshti Dental School faculty members about open access electronic journals.

Methods A questionnaire was used to collect information on 68 available faculty members of the Shahid Beheshti Dental School in this descriptive, cross-sectional study. Among others, the questionnaire asked for demographic information, academic level and current status of using electronic journals. The validity and reliability of the questionnaire were assessed using Cronbach’s alpha and content validity statistics. The collected data were analyzed using SPSS software. The descriptive statistics such as percentage, mean and standard deviation and non-parametric tests such as binomial, Friedman, Kruskal Wallis and Mann Whitney tests were used.

Results The mean and standard deviation of score on acquaintance with open access electronic journals, the mean score of using these journals and the mean score of attitude of faculty members towards these journals were 3.45 (±0.7), 2.76 (±0.88) and 3.13 (±0.4), respectively.

Conclusion The attitude and acquaintance level of the faculty members with open access journals were moderate; while their usage was less than moderate. Therefore, faculty members must be encouraged to use open access journals more frequently in order to keep up with scientific advances in their field.

Effect of component dismantling on quality of sterilization of mechanical torque limiting devices (pilot study)

Aboulfazl Saboury, Seyed Jalil Sadr, Gita Eslami, Mahsa Rashidpour, Mohammad Ebrahim Ahmad Nejad, Minoo Mahshid, Nazila Najari Dizaji, Ali Fayyaz

Journal of Dental School, Shahid Beheshti University of Medical Sciences, Vol. 35 No. 4 (2017), 5 Esfand 2019, Page 138-142

Objectives Dental instruments may serve as a route of infection transmission. The necessity of dismantling of Friction-Style (FS) and Spring- Style (SS) mechanical torque limiting devices (MTLDs) prior to disinfection and sterilization is a matter of debate, aside fromthe fact that it is difficult and time-consuming. This study sought to assess the effect of dismantling of components on quality of sterilizationof MTLDs.

Materials and Methods 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.

Results Growth of B. stearothermophilus did not occur in any plate (no turbidity). Only one plate showed growth of Staphylococcus saprophyticus.

Conclusion Dismantling of components had no significant effect on quality of sterilization of MTLDs.

Case Report

Titanium implant osseointegration in rheumatoid arthritis patients: Two case reports

Mehran Shokri, Jafar Rostamiana, Zahra Chegini

Journal of Dental School, Shahid Beheshti University of Medical Sciences, Vol. 35 No. 4 (2017), 5 Esfand 2019, Page 150-154

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 scientific 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 satisfied 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.

Review Article

School-Based Oral Health Promotion: A Thorough Review

Mohammad Hossein Khoshnevisan, Mina Pakkhesal, Mohammad Pooyan Jadidfard, Gita Godarzi Nejad

Journal of Dental School, Shahid Beheshti University of Medical Sciences, Vol. 35 No. 4 (2017), 5 Esfand 2019, Page 143-149

Objectives 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.

Methods 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.

Results 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).

Conclusion 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

Letter to Editor

Journal of Dental School

Ghasem Ansari

Journal of Dental School, Shahid Beheshti University of Medical Sciences, Vol. 35 No. 4 (2017), 5 Esfand 2019,

jdentsch.com), which aimed to reach a wider range of audience. The second objective of this major move was to attract more international researchers to engage with their publishable materials allowing a diversity of the author’s range. A further move has been adopted to involve new editorial board members providing a boost to impact leading to the journal’s external to its international recognition. In this respect, the ulti- mate goal is to index this valuable scientific research base product in international indexing systems. Journal of Dental School, Shahid Beheshti University of Medical Sciences has a long history and bright background in which it had achieved high national recognition for many years. While JDS is a dentally focused subjected journal, it covers a wide range of research in the field of dental science. Despite growing number of publi- cation sources including journals, there is a rising trend towards publication of original works ready to be published. The launch of well-established JDS is believed to provide a much-needed source for young researchers and academics to have their publications to their potential worldwide readers. This will also allow the scientific dental community to become aware of the research lines and products from Iran and those contributing from the rest of the world. JDS has also been aimed to enhance the quality and sound- ness of the research publication in the region with several inclusive workshops on items, such as standard review points for medical journals, writing a scientific article, standard citations, and referencing, clinical application of research outcomes, preparation of systematic reviews, and more through the last 2 years. This program is constantly repeated for accessibility of those interested. An online version of the courses can be reached on demand.

Editorial board members encourage potential authors to submit their valuable works online to JDS for speedy consideration. Authors are cordially strived to cite the materials published in this journal in their articles in order to boost their productivity.

Reader’s Interest and Recent Issues Contents

The most recent issues published consist of variety of topics including material science ranging from dental implants to surgical approaches for management of malignancy, dental sedation, and its prospect in dentistry, radiographic imaging and new updates, developments in endodontic therapy, as well as new findings in restorative and esthetic dentistry. As it is evident both clinical and laboratory research works are covered in JDS and also animal studies are strongly invited for publication in JDS. Since the scope of JDS journal includes a wide range of topics in the field of dental science it is believed that JDS has provided the ground for all the disciplines of dentistry allowing various readers with their specialty to have direct access to the work of those in other disciplines. Since the JDS is the official publication of Dental School at Shahid Beheshti University of Medical Sciences, it has a close collaboration with many high-ranked academics in medicine who had and will serve as reviewers, as well as contributing legs to the interdisci- plinary research works. A broadened spectrum of work is expected to be published in JDS widening the range of audiences among the medical and dental professions. Evidence-based materials published in JDS are thoroughly reviewed in very restricted blinded and standard manner in order to make sure the pub- lished materials are based on the International Committee of Medical Journal Editors (ICMJE) guidelines and requirements for manuscripts for bibliographic references developed by National Library of Medicine (NLM) first published in 1979.