background: chewing-gum may serve as an effective oral hygiene device when brushing may not be possible. the aim of the present study was to evaluate the effect of chewing sugar-free gum twice a day after meals in addition to tooth brushing on dental plaque and interdental debris.     methods: twenty four (12 males and 12 females aged 20-21 years) healthy third-year dental students participated...

objectives: the aim of this in-vitro study was to assess the thermal effect of light emitting diode (led) light curing unit on the enamel etching time. materials and methods: three treatment groups with 15 enamel specimens each were used in this study: g1: fifteen seconds of etching, g2: five seconds of etching, g3: five seconds of etching plus led light irradiation (simultaneously). the micro ...

the effect of inter-implant distance on retention and resistance of implant-tissue-supported overdentures is lacking in the literature. an in vitro study was performed to evaluate this effect for mandibular implant-tissue-supported overdentures retained by two ball attachments.an acrylic cast of an edentulous mandible was fabricated. three pairs of implants were symmetrically placed at both sid...

objectives: the purpose of this study was to compare the accuracy of implant position transfer and surface detail reproduction using two impression techniques and materials. materials and methods: a metal model with two implants and three grooves of 0.25, 0.50 and 0.75 mm in depth on the flat superior surface of a die was fabricated. ten regular-body polyether (pe) and 10 regular-body polyvinyl...

objective: the aim of this study was to investigate the effect of phosphoric acid re-etching of an enamel surface treated via a one-bottle adhesive system on shear bond strength between resin composite and the enamelsurface in different stages of adhesive application. materials and methods: extracted intact premolars (n=84) were divided into sevengroups (n=12). in the control group 1, the adhes...

objective: the purpose of the present study was to assess the microleakage of composite restorations with and without a cervical amalgam base and to compare the results of dif-ferent composites and bonding agents. materials and methods: one hundred and twenty mesio-occlusal (mo) and disto-occlusal (do) class ii cavities were prepared on sixty extracted permanent premolar teeth. the teeth were r...

objective: preservation of unsupported occlusal enamel after removal of underlying carious dentin may result in maintenance of aesthetics as well as wear resistance against the opposing enamel. this study investigates the influence of different restorative materials and bonding agents on reinforcement of unsupported enamel in molars and compares it with sound dentin. materials and methods: in t...

objectives: fracture strength is an important factor influencing the clinical long-term success of implant-supported prostheses especially in high stress situations like excessive crown height space (chs). the purpose of this study was to compare the fracture strength of implant-supported fixed partial dentures (fpds) with excessive crown height, fabricated from three different materials. mater...

introduction: anxiety of patients is one of the problems in dentistry which are considered in recent years, and it prevents them from having a treatment out of stress. this study was conducted to specify anxiety prevalence and related elements among endodontic patients. materials and methods: the study was conducted on 150 patients referred to endodontic department of dental school of islamic a...

background: dental students have reported a high prevalence of psychological stress and the causes are associated with the challenging dental environmental and demographic factors. this study aimed to conduct a preliminary investigation on dental students’ stress status, using a sample of first-to-third-year bachelor of dental surgery students in an australian university. special interests incl...