[Microleakage evaluation of four luting cements in full coverage base metal crowns]

It is thought that the most important factor for pulpal stimulation and necrosis is the microleakage of intracoronal and extracoronal restoration. A luting cement with a favorable seal and the least bacterial leakage should be selected. The purpose of this study was to compare the microleakage of four luting cements: Zinc phoshate, zinc polycarboxylate, glass ionomer and panavia F and also three finishing margins: deep chamfer, shoulder, and shoulder bevel, when been applied with porcelain fused to base metal crowns. In this parallel interventional study, 96 intact human premolars were selected and divided into three groups of 32 based on the type of finishing line. Each group was randomly divided into four subgroups of 8, based on the type of luting cement. After cementation, the specimens were thermocycled. Dye penetration was done by 0.5% fushin. The data were statistically analyzed using Kruskal Wallis and Mann-Whitney test [alpha =0.05]. 1. There was a significant difference among cements in respect to mean rank of microleakage [P<0.05] 2. There was a significant difference in mean rank of cements after two by two comparison. [P<0.05] 3. The least microleakage was observed in Panavi F followed by glass ionomer and zinc polycarboxylate. 4. The greatest microleakage was observed in zinc phosphate cement Panavia F as a luting cement could create suitable seal for base metal crown due to its ability in producing the least microleakage and adhesion to dental tissue

Laboratory evaluation of marginal porcelain extension on microleakage of base metal crowns

The purpose of this study was to evaluate the marginal porcelain extension on microleakage of base metal porcelain crowns when four types of luting cements have been used for cementation. In this invitro experimental study, ninety six base metal-porcelain crowns with three types of finishing margins were made for premolars. Then they were luted with four different luting cements [zinc phosphate, zinc polycarboxylate, glass ionomer and Panavia F]. Next, they were thermocycled [1000 times]. Finally, the microleakage was measured after dye penetration. For data analysis, Non parametric Kruskal-Wallis and Mann-Whithney tests were used [=0.05]. 1. The mean rank of microleakage in buccal margin was more than lingual one [P<0.05]. 2. In all of the finishing margins, zinc phosphate cement showed the highest microleakage in buccal and lingual walls [P<0.05]. 3. In all of the finishing margins, Panavia F showed the least microleakage compared to the other cements in two walls [P<0.05]. For promotion of marginal seal in base metal - porcelain crowns, the use of Panavia F as a luting cement is suggested

[Outpatient versus inpatient treatment of pyelonephritis in pregnancy]

For comparing outpatient versus inpatient treatment of acute pyelonephritis in pregnancy, a randomized clinical trial was done on 50 cases, who were reffered to Ghaem and Imamreza hospital. Pregnant patients who had the clinical signs and symptoms [fever,shaking chills and aching pain in one or both lumber regions] and laboratory [signs clean voided specimen contaning more than 100,000 organisms per ml] were considered as cases of acute polynephritis during pregnancy. After having obtained informed consent and having provided the patients with the required in formation, they were randomized in two groups. Group 1 [out patient=25 person] received 1 gr of ceftriaxone as a single dose intramuscularly, then they completed a 10 days course of oral cephalexin in a dosage of 500 mg every 6 hours. Inpatients [25 persons received 1 gr keflin IV every 6 hours until fever and other symptoms disappeared for 24 hours following which they were discharged and instructed to continue 500mg oral cephalexin every 6 hourly for a period of 10 days. There were not any statistically significant differences in age, pariety and duration of clinical responses and complications between the two groups. Of those treated as outpatients, 22.2% failed to show a response to treatment compared to 8% in the inpatients group, and the treatment protocols were therefore changed. This study shows that outpatient management of pregnant women with acute pylonephritis is appropriate, and is an effective standard treatment in the prevention of complications of the disease