1 111 So on Ex-vivo Sealing Ability of Different Thicknesses of White and Gray Angelus MTA as an Intra-orifice Barrier in Endodontically Treated Teeth Sadeghi Shiva b Tabari Ramin c Almasi Shahroz d b Department of Endodontics Faculty of Dentistry/Oromaxillofacial developmental disease research center, Guilan University of Medical Sciences, Rasht, Iran c Department of Endodontics, Faculty of Dentistry, Guilan University of Medical Sciences, Rasht, Iran d private practice 1 10 2014 3 2 1 5 07 04 2015 07 04 2015 Introdouction: It is important for the clinician to be aware regarding the necessary thickness of materials used as intra-orifice coronal barriers to prevent microleakage. The purpose of this in vitro study was to compare coronal microleakage of three different thicknesses of white and gray Angelus mineral trioxide aggregate (WAMTA, GAMTA). Materials and methods: A total of 66 canals of extracted maxillary central incisors were instrumented and obturated with gutta percha and AH26 sealer using cold lateral compaction technique. The teeth were randomly divided into two experimental groups of 30 teeth each according to the material tested (WAMTA and GAMTA) and two negative and positive control groups of three teeth each. The experimental groups were then subdivided into three groups of 10 teeth each according to the coronal plug thickness (2, 3, and 4 mm). The obturation material was removed upto the experimental depths and was sealed with tested materials. Sealing ability was evaluated by the dye penetration method using Pelikan ink and a stereomicroscope at ×10 magnification and 0.01 mm accuracy. Data were analyzed by analysis of variance (ANOVA) and t-test. Results: t-test analysis revealed that there was no significant difference between coronal microleakage of GAMTA and WAMTA at depths of 2, 3, and 4 mm (P < 0.88, P < 0.285, P < 0.62). ANOVA test revealed that there was no significant difference between leakage of different thicknesses of WAMTA (P < 0.365) and GAMTA (P < 0.217). Conclusion: Coronal microleakage of 2-mm thickness of WAMTA and GAMTA had no statistically significant difference with 3-mm and 4-mm thicknesses of the materials.
112 So on Comparison of the Mesiodistal Crown Dimensions of Upper And Lower Central Incisors Between the Natural Dentition and Artificial Teeth in Iran Taghipour Ali e Rezaei Maryam f Khafri Soraya g Joudi Reza h e Department of Prosthodontics, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran. f Department of Prosthodontics, Dental Materials Research Center, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran g Department of Social Medicine and Health, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran h Department of Prosthodontics, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran 1 10 2014 3 2 6 12 07 04 2015 07 04 2015 Introdouction: The aim of this study was to compare the ratios of the mesiodistal width of the upper and lower central incisors between natural teeth and those produced artificially by Ideal Makoo, Ivoclar, and Vitapan, in Iran. Materials and methods: The mesiodistal width of the upper and lower central incisors was measured in 120 students, using calipers placed at the height of contour of the teeth. The widths of the upper and lower central incisors, and their ratios, in the artificial teeth were determined using the tooth catalogs of Ideal Makoo, Vitapan, and Ivoclar products. Results: The average mesiodistal width of the upper and lower central incisors, in the natural dentition, was 8.54 ± 0.76 (mean ± standard deviation (SD)), and 5.29 ± 0.57 (mean ± SD), respectively, while the ratio of the widths of the upper central incisors to the lower central incisors was 1.63 ± 0.21 (mean ± SD). Conclusion: Considering the similarities in the widths of the upper and lower central incisors, their ratios, and the esthetics, between the natural dentition and the commercially available artificial teeth, dentists in northern Iran are advised to use the A36 A7, A66 A7, A26 A7, A14 A7, and A56 A7 sets from Ivoclar products as well as the Z85 L13, Z84 L9, and Z74 L9 sets from Vitapan products for males. Furthermore, sets Z61 L3 and Z51 L3 from Vitapan products are recommended for females, whereas the sets A54 I5 from Ideal Makoo products and A24B A5, A12 A5, A13 A5, and A54 A5 from Ivoclar products are recommended for general use in dentures. 113 So on Comparison of The Perception of Smile Esthetics Among General Dentists and Specialist RahmatiKamel Manouchehr i Samadi Elham j Samadi Fatere k Khafri Soraya l i Department of Orthodontics, Faculty of Dentistry, Babol University of Medical Science, Babol, Iran j Faculty of Dentistry, Babol University of Medical Science, Babol, Iran k Department of Orthodontics, Faculty of Dentistry, Mazandaran University of Medical Science, Sari, Iran l Department of Social Medicine, Babol University of Medical Science, Babol, Iran 1 10 2014 3 2 13 22 07 04 2015 07 04 2015 Introduction: The effect of education on esthetic perception is still unclear. This study aims to compare the perception of smile esthetics, under various conditions, among general and specialist dentists. Materials and Methods: A photograph of a woman’s smile was digitally altered using a software image editing program. Alterations were made tothe dental midline, anterior gingival display, buccal corridor, golden proportion, and upper lip vermilion border height. The perception of smile in each of the modified images were assessed by orthodontists (n=15), prosthodontists (n=15), maxillofacial surgeons (n=15), esthetic and operative dentists (n=15), and general dentists (n=20), and scored using a Visual Analog Scale (VAS). The mean VAS scores were calculated for each photograph. Results: The orthodontists were less tolerant in their perception of a dental midline deviation, and rated a 1mm shift as less attractive, whereas, the maxillofacial surgeons perceived a smile as less attractive when the midline was deviated by3mm. Dentists from all groups perceived smiles with less gingival display and reduced vermilion height as the most attractive. In addition, an average buccal corridor area was preferred by most dentists in all groups. Golden proportion in the anterior teeth was perceived as attractive only by the orthodontists. In each image no significant difference was discovered between the scores of different groups of the participants. Conclusion: The range of perception and sensitivity about each factor in specialists and general dentists was different but the ideal image was the same. 114 So on Comparison of Shear Bond Strength of Composite Restorations to Intact Enamel of Primary Incisors When Using Different Conditioners and Adhesive Systems Nozari Ali m Heidari Ali n Rafiee Azade o m Department of Pediatric Dentistry, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran n Dental School, Shiraz University of Medical Sciences, Shiraz, Iran o Department of Pediatric Dentistry, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran 1 10 2014 3 2 23 28 07 04 2015 07 04 2015 Introdouction: Esthetic demands of patients have led to the introduction of tooth-colored restorations wherecomposite resins are bonded to the enamel using acid etch techniques. Total etch adhesion systems are still considered as the gold standard among bonding systems. However, clinicians have a tendency to use adhesive systems with simpler application procedures. The aim of the present study is to compare the shearbond strength of composite restorations to intact enamel of primary incisors when using different conditioners and adhesive systems. Materials and methods: This experimental study was conducted in Shiraz University of Medical Sciences. 53 teeth were collected and classified into five groups based on the bonding procedure. After composite buildup, specimens were placed in a universal testing machine with a cross-head speed of 1mm/ min. Inter-group comparison of the shearbond strength to enamel was analyzed employing one-way-ANOVA and Tukey’s post-hoc test. Data were statistically analyzed using SPSS (Version 17, Chicago, IL, USA). Results: The highest shearbond strength was found in the second (37% phosphoric acid etching + Margin Bond adhesive system) and fifth groups (37% phosphoric acid etch + Tokuyama Bond Force adhesive system), and the lowest bond strength was found in the third group (Tokuyama Bond Force adhesive system alone) (p = 0.00). Conclusion: Based on the results of the present study, surface pre-treatment with 37% phosphoric acidalong with self-etching adhesive system resulted in increased shearbond strength in vitro. This method can be further studied in clinical settings. 115 So on Unilateral Temporomandibular Joint Dislocation after Jaw Thrust Maneuver mohammadzadeh jouryabi Ali p khalighi sigaroudi Ali haghighi mohammad Sedighinejad Abbas naderi nabi Bahram ghazanfar tehran samaneh ashoori saheli nasim p Department of Anesthesiology , Guilan University of Medical Sciences, medical School, Rasht, Iran Department of Oral And Maxillofacial Surgery, Guilan University of Medical Sciences, medical School, Rasht, Iran Department of Anesthesiology , Guilan University of Medical Sciences, medical School, Rasht, Iran. Department of Anesthesiology , Guilan University of Medical Sciences, medical School, Rasht, Iran. Department of Anesthesiology , Guilan University of Medical Sciences, medical School, Rasht, Iran Department of Anesthesiology , Guilan University of Medical Sciences, medical School, Rasht, Iran. Department of Anesthesiology , Guilan University of Medical Sciences, medical School, Rasht, Iran. 1 10 2014 3 2 29 32 07 04 2015 07 04 2015 A 25-yr-old Iranian woman with incomplete abortion who was diagnosed and scheduled for dilatation and curettage procedures under general anesthesia. After premedication with Fentanyl 50µg and midazolam 2mg and enough pre-oxygenation, anesthesia was induced by sodium thiopental 250 mg and succynilcholine 60 mg with mask ventilation. After completion of procedure, the patient had a period of laryngospasm that we had to maneuvered head tilt and jaw thrust to insert an oral airway for effective ventilation. It was noted that the patient mouth was persistently open about 2 cm after removing of oral airway as the patients chin deviated to the left side. On palpation the right temporomandibular joint (TMJ) could be felt below the zygomatic arch and a diagnosis of unilateral mandibular dislocation was made. To confirm diagnosis plain radiography (anterior posterior skull projection) was immediately taken. TMJ dislocation was reduced by the anesthesiologist that placed his thumbs near the mandibular posterior teeth with his finger .Jaw dislocation after general anesthesia should be consider as an emergency situation that be harmful for the patients so everybody who work in the airway management must be alert to this complication .Actually, know to treat it. 116 So on A Technique for Registration and Reorientation of Surveyed Dental Casts Abolhasani Majid Shakibamehr Amirhosein Neshandar Asli Hamid Dental Implants Research Center, Department Of Prosthodontics, School Of Dentistry, Isfahan University Of Medical Sciences, Isfahan, Iran. Department of Prosthodontics, School of Dentistry, Qazvin University of Medical Sciences, Qazvin, Iran Department of Prosthodontics, School of Dentistry, Guilan University of Medical Sciences, Guilan, Iran 1 10 2014 3 2 33 36 07 04 2015 07 04 2015 Precise registering and transferring of the selected path of insertion and withdrawal of removable, partial dentures is a critical step in designing and fabricating their framework and determining the retention, stability, and support of the completed prosthesis. Many authors have addressed this issue in their studies. In this study we present a new technique for registering and reproducing partial edentulous cast orientation by the use of a laser level.