Caspian Journal of Dental Research

14-19

Authors: Mitra Tabari , Behnaz Esmaeili , Mona Alimohammadi *, Arash Poorsattar Bejeh Mir , Samane Gharekhani , Mahmood Hajiahmadi , Mobina Mollaie

Introduction: Simultaneous etching of enamel and dentin using the novel generation of adhesive systems with contracted operational steps, has shown a good clinical efficacy. The aim of this study was to evaluate the microleakage of composite restorations using the V and VII generations of adhesive systems on primary teeth. Methods: This study was performed on 45 human intact extracted primary teeth. Following class V cavity preparation, the samples were randomly divided into three groups included 15 teeth based on the type of bonding agent; Single Bond 2, Clearfil S3 Bond or G Bond. After applying the bonding agents, the teeth filled with composite Z250. The microleakage values of incisal and gingival margins were separately scored by 2% basic fuchsine staining based on a 0-3 ordinal ranking system. The data were analyzed by using Kruskal Wallis and Mann_whitney U tests. Results: In overall, the score of microleakage at incisal (0.58±0.94) and gingival (1.06±0.19) edges did not have significant difference. Also, there was no significant difference between incisal and gingival microleakage considering the different types of bonding. Conclusion: Regarding to less operational steps and lower risk of salivary contamination, the VII generation of dentin bonding agents can be applied for filling the class V cavities of primary teeth.

26-31

Authors: Fateme Arbabi-Kalati , Tahereh Nosratzehi *, Leila Farhadmollashahi , Marzie Asadi Idanlo, Zakaria Bameri

Introduction: Maintaining good oral hygiene is an important factor in health. Toothbrushes are commonly used to maintain oral health and prevent dental disease, but unfortunately how keeping the toothbrush is neglected. The aim of this study was to investigate the relationship between toothbrush keeping method and its microbial content. Methods: In this cross-sectional study, 60 volunteers were enrolled and divided into 3 groups based on the places of keeping their toothbrushes (bedroom, bathroom and lavatory). The participants were asked to brush once a day for one month using the first toothbrush which had been delivered; then the first toothbrushes were gathered and a second toothbrush was delivered. The participants were asked to brush once a day using the second toothbrush for 3 months. All toothbrushes were sent for culture and evaluation. All toothbrushes were evaluated by a blind microbiologist. Toothbrush bristles were washed in BHI broth medium; then the resulting liquid was cultured in MacConkey’s agar for gram-negative bacteria and in blood agar and chocolate agar for gram-positive bacteria. Colony counts of Streptococcus mutans, Candida albicans, Pseudomonas, Klebsiella, S. aureus, and E. coli were determined and multiplied by one thousand. Data were analyzed by SPSS version 18 and using Kruskal-Wallis test. Results: At the end of the study the results showed statistically significant differences in microbial load between the groups (p=0.014). Toothbrushes that were kept in bathroom had highest microbial load. Conclusions: Toothbrushes kept in the bathroom had the greatest microbial contamination after three months. According to the results of this study, bathroom is the worst place and bedroom is the best place for keeping toothbrushes.

39-45

Authors: Effat Khodadadi , Behnaz Esmaeili *, Naemeh Karimian, Soraya Khafri

Introduction: Sealing pits and fissures was introduced as an approach to prevent occlusal caries for more than two decades. The aim of this study was to compare the microleakage of flow able resin reinforced glass ionomer (Ionoseal) with other materials used as fissure sealants. Methods: In this in vitro study, 50 premolar teeth of human free of any caries were selected. Fissurotomy was done with fissure bur. The samples were randomly categorized into five groups (Fissurit FX, Fuji II light-cured,Grandio flow, Ionoseal). Ionoseal was assessed by using two methods: with and without etching and bonding agent prior to sealant application. After sealant placement, all surfaces of the teeth except 2 mm area around the sealant margins were covered with two layers of nail polish. The specimens were thermocycled, and they were sectioned after immersing into a 0.5 % basic fuchsine solution. The amount of microleakage was examined by stereomicroscope. Results: The microleakage comparisons of groups indicated that Ionoseal without etching and bonding application had significantly greater microleakage than the other groups (p<0.001), while there was statistically no significant difference between the microleakage of Ionoseal and the other groups after etching and bonding application (p>0.05). Conclusions: By considering isolation difficulties in children and observing high amount of Ionoseal microleakage (without etching and bonding application), the samples need to be etched and bonded like other resin-based materials before Ionoseal placement in order to achieve clinically desirable microleakage outcomes.

54-59

Authors: Ahmad Sodagar , Farhad Sobouti *, Negin Shahsavari

Introduction: Different factors such as respiratory disorders, genetics, facial growth pattern, tongue malfunction and malposition are associated with anterior open bite. Skeletal open bite is often appeared by increased posterior dentoalveolar height of maxilla and backward rotation of mandible. Many treatment approaches have been developed for treatment of increased facial height problems. Achieving absolute anchorage has been a very efficient device for intrusion of posterior segments. In this article, the treatment of patient with severe skeletal open bite and facial imbalances was explained .researchers of the present study used mini screws for leveling of upper arch by intrusion of premolars .Then, appropriate orthognathic surgery was done.