ABSTRACT
Achieving appropriate retention and easy irretrievability at the same time is challenging inimplant-supported fixed partial dentures [FPDs]. Researchers have always been in search of a temporary cement to improve the retentive strength.The aim of this in vitro study was to evaluate the effect of three different temporary cements and sandblasting of the abutment surface on the retentive strength of implant-supported fixed prostheses. In this experimental study, 10 DIO implant analogues were embedded in acrylic resin.Twenty abutments were divided into two groups of 10. The abutments in group one were used in their intact standard form while those in group two were sandblasted. Sixty metal copings were fabricated and cemented on abutments ofeach group using three types of temporary cements namely Kerr, Provy and GC. Specimens were subjected to auniversal testing machine to measure their retentive strength. The results were analyzed by Tukey's post-hoc test. The retentive strength of Temp Bond [Kerr] with sandblasted abutments was significantly higher than that ofthe other two cements [p<0.001]. In standard abutments, Provy had slightly but not significantly higher retentive strength. The lowest values in both abutment groups were obtained by GC cement. Kerr tempBond cement with sandblasted abutments yields the highest retentive strength
ABSTRACT
To determine the efficacy and safety of subconjuctival injection of mitomycin C versus daunorubicin for treatment of pterygium. This randomized double blind placebo-controlled clinical trial included 54 eyes of 36 patients with pterygium who were referred to Al-Zahra Hospital, Zahedan-Iran in 2004. Eyes were randomly assigned to three groups including mitomycin C, daunorubicin or placebo. The injection was performed subconjuctivally at limbus under the pterygium. Patients were examined before and one month after injection. Change in symptoms and size reduction of pterygia and complications were compared among the three groups. There was no statistically significant difference between the three groups in terms of age and primary pterygium size. Post-injection reduction in symptoms and pterygium size had no significant difference among the three groups. Post-njection complication rates were 72.2%, 93.3% and 40% in the mitomycin, daunorubicin and placebo groups, respectively. Serious complications were not seen in any group. Subconjuctival injection of mitomycin C and daunorubicin for treatment of pterygium is relatively safe, but has little effect in reducing symptoms and pterygium size
ABSTRACT
To evaluate the range of accommodation lag and it's signs and symptoms in 20-25 year-old female students at Zahedan Medical School, Iran. Three-hundred female students were enrolled for assessment of accommodation. After exclusion of individuals with individuals with accommodation disorders in 3 steps including amplitude of accommodation, accommodative facility, and relative accommodation; 216 students remained and were assessed for accommodative response and lag. Of 216 eligible persons, 28 [13%] had no accommodation lag. Accommodation lag of other degrees were as follow: +0.25 in 42 [19.4%], +0.50 in 40 [18.5%], +0.75 in 39 [18.1%], +1.00 in 51 [23.6%], +1.25 in 4 [1.9%], +1.5 in 10 [4.6%], and +1.75 in 2 [0.9%]. None of the 149 participations with accommodation lag of 0.00 to + 0.75 had any problem. From 51 persons with +1 accommodation lag, 6 [11.8% or 2.8% of total] had eye strain and 4 [2.8% or 1.9% of total] had both burning and eye strain. Overall, 4.2% had burning eye strain. Accommodation lag assessment is a necessary exam for complaints of eye strain and burning
ABSTRACT
In order to identify the effects of vitamin A and aspirin on reducing UV light-induced retinopathy, ERG waves were compared before and after UV light exposure in rabbits. 30 rabbits were divided into 3 groups: the first group received vitamin A, 50,000 units I.M., single dose, the second group received aspirin, 50 mg/ Kg/day PO and the third group did not receive any medication. All three groups were exposed to UV light generated by three 30 watt lamps for 14 days. Baseline ERGs were recorded for all rabbits prior to UV light exposure and the second ERG was taken 14 days after exposure. The control group showed a 62.6% decrease in voltage amplitude from the baseline of photopic flicker 30 Hz ERG. This decrease was 28.6% for those who received vitamin A and only 8.8% for those who received aspirin. Regarding photopic single flash ERGs, the decrease in the voltage amplitude for control, vitamin A and aspirin groups was 49.02%, 26.14% and 24.83%, respectively. It was therefore concluded that vitamin A and aspirin have a preventive role on the side effects of UV light in the rabbit eye retina. Further studies are needed to elicit the appropriate dosage of aspirin and vitamin A in preventing the side effects of UV light in the human eye