Evaluation of community periodontal index of treatment needs in pregnant and non pregnant women

Based on the latest researches it is concluded that periodontal disease is an important risk factor, leading to preterm delivery low birth weight babies and the effects of socioeconomic status on periodontal condition. The aim of this study, evaluation of periodontal condition of pregnant and non-pregnant women based on CPITN index and relation between the demographic and clinical variables. A cross-sectional descriptive study was carried out among 540 pregnant and non-pregnant women. Data collection was carried out with a questionnaire with demographic and clinical variables. Examinations were performed with WHO probes and dental mirrors. Data were analyzed by the means on Chi-square T-test and Anova. SPSS Software was used. The results of study showed that 66.7% pregnant women had periodontal disease and 92% pregnant women in third trimester had periodontal disease. There was a significant relation between CPITN and gestational age, education level, economic level and frequency of tooth brushing. The results of this study showed that pregnant women had higher CPITN than non pregnant women, then it might be suggested that simple preventive oral hygiene program help to maintain healthy periodontium during pregnancy

[comparative study of shear bond strength of composite resin to human dentin surface bonded with three dentin bonding systems in vitro]

The aim of this study was to measure the shear bond strength of composite resin to human dentin surface bonded with three different bonding systems. The crown surface of 66 extracted human third molar teeth were abraded with trimer in a wet environment until the dentin surface was exposed, and they were polished with silicon carbide paper 400 and 600 grit. Then, all the smooth smear layer samples were randomly classified into three equal groups. We used bonding according to the instruction of the manufacturer [the first group Single Bond, the second group BC Plus and third group Charm Bond]. Then, the composite resin was bonded to the tooth surface by plastic tube [diameter: 1.8 mm, height: 5mm].Finally, shear bond strength was determined by universal testing machine [LMT 100]. The variance analysis [ANOVA] P value=0/000 revealed the mean of shear bond strength is different between three groups. The mean shear bond for first, second and third groups are 15.25 MP, 6.84 MP, 8.59 MP, respectively. The multiple comparison with THKEY test showed that there is different significance between group one and the other two groups which did not differ significantly. All in all, we found out that greatest shear bond strength to dentin is the American Single Bond, which is better than Korean product [BC Plus and charm Bond]

Comparison of the effects of two immediate dentin sealing procedures on shear bond strength of resin cements to dentin

Cementation of indirect restorations with resin cements, does not always provide better bonding performance to dentin when compared with direct dentin bonding systems. Immediate dentin sealing was introduced to overcome this problem with some successful reports. The aim of this study was to compare the effect of immediate dentin sealing on shear bond strength of resin to dentin. In this study, 66 human third molars were randomly divided in three equal groups: 1- Bonding composite blocks with dual cured RelyX ARC cement to dentin without pretreatment. 2- Bonding composite blocks with dual cured Rely XARC cement to immediately sealed dentin with single bond and 3- Bonding composite blocks with dual cured Rely X ARC cement to immediately sealed dentin with single bond and a flowable composite. Shear bond strengths were measured with a universal testing machine. Data were analysed by one-way ANOVA and Tukey statistical tests. Means and standard deviations of tensile bond strengths were as follows: groupl:8.55 +/- 3.18, group 2: 6.67 +/- 2.21 and group 3: 14.07 +/- 5.02. The differences in shear bond strength between groups were different significantly only when group 3 was compared with groups 1 and 2 [P= 0.000]. Immediate dentin sealing with dentin bonding had no effect on bond strength. Use of flowable composite in combination with single bond improved bond strength

[Relationship between chronic periodontitis and plasmatic level of total cholesterol, triglycerides, LDL and HDL cholesterol in patients referring to Ahvaz dental school in 1386-87]

Hyperlipidemia is a major risk factor for cardiovascular disease. In recent years some evidence have been presented on the association of periodontal and cardiovascular disease. Acute systemic or local chronic infections seem to induce changes in the plasmatic concentration of cytokines and hormones, which determine changes in the lipid metabolism. The aim of this study was the evaluation of association between chronic periodontitis and plasma lipid level. The plasma lipids levels of were measured in 90 subjects. The patients were divided into two age- and sex- matched groups: a test group, composed of 45 individuals with chronic periodontal diseases ranging from moderate to severe, with at least two periodontal pocket >/= 5[mm]; and a control group, composed of 45 periodontally healthy individuals or with gingivitis. Individuals with diabetes, hypertension, with history of myocardial infarction or cancer, or those who used diuretics, corticosteroids, anabolic steroids, and those who had received periodontal treatment in the last six months and/or took cholesterol reduction medicine in the last two months before the beginning of this study were not included in the study. Variables related to high cholesterol levels, including age, sex and, body mass index, were evaluated. Total cholesterol [CHOL] and triglycerides [TG] were significantly higher in case group compared with control group [P<0.001]. HDL and LDL cholesterols were higher in cases but didn't have any significant differences with controls. The frequency of persons with pathologic value of TG and CHOL were significantly higher in cases compared with control group. This study showed that hyperlipidemia may be associated with periodontitis in medically healthy people but we can not conclude that whether periodontitis causes an increase in levels of serum lipids or whether hyperlipidemia is a risk factor for periodontitis

[Compatation study of two posterior composite operation in endodonticaly treated maxillary premolar with mesio-oclioso- distal cavity before and after mounting in a artificial mouth]

There are many restorative designs for root canal treated maxillary premolars that each of which have their own advantages and disadvantages. One of this treatments is composite inlay restoration with fiber-reinforced composite which has sufficient retention, strength and acceptable apearence,as well as more compatibibility and less leakage than cast-metal restoration. In this -experimental study, after calculating a sample groups, 72 sound maxillary premolar teeth with the same size were chosen and fixed in acrylic resin so that the CEJ was 2 mm upper than the level of resin. The sample were randomly divided in to six groups of 12. Group 1[positive control]: intact teeth. Group 2 [negative control]: root canal treated with MOD cavity preparation that had been extended 1 mm below CEJ. Group 3 and 4: root canal treated teeth with MOD cavity preparation for fiber- reinforced [Nulite F] composite inlay using Nulite F2 liner. Group 5 and 6: these groups were prepared in the same way as groups 3 and 4, differing in that, this specimens were restored by 3MP60 composite instead of Nulite F. Following restoration, all specimens was termocycled 500 times. Specimens of groups 1,2,3,5 were loaded by the universal testing machine [Zwick z020, Germany] at speed of 0.5 mm/min. specimens in groups 4 and 6 onset were loaded by artificial mouth 1000,000 times then loaded by universal testing machine. Finally the results were analyzed using ANOVA test and comparasion multiple tests. Average fracture resistance for first group was 2.091 killo nioton, [kn] second group was 0.862kn, third group was 1.577 kn, fourth group was 1.431 kn, fifth group was 1.296 kn and sixth group was 1.170 kn. According to data analysis the deference between first and secovd groups to other groups was significant. Fracture resistance of 3th group with 5 and 6 groups and 4 th group with 6 group have significant deference. Because of increasing of the fracture resistance in endodontically treated teeth that restorated with fiber-reinforced composite [Nulite F] and their significant deference in comparasion with conventional posteror composite [3MP60] as well as their other properties, can say that we can use fiber - reinforced composite as an acceptable method for reconstruction of endodotically treated maxillary pre molar