mohammadreza vatankhah

Endodontic therapy has been regarded as a safe treatment option with highly promising results in preserving natural teeth. Numerous factors may influence the longevity of endodontically treated teeth (ETT), thus altering their success/survival rate. Thisstudy aimed to determine the survival and success rates of endodontically treated premolars and molars with different complex restorative/prosthodontic treatments.

A total of 190 patients with an ETT were included, who had received final coronal restoration up to 14 days after the temporary one and at least one year prior to the enrollment. The investigator evaluated the quality of endodontic filling, coronal restoration, mobility, and proximal contacts. Data were analyzed with multiple binary logistic regression and the Chi-Square test.

The average duration of follow-up was 28.6±11.9 months. Overall, 89.4% (170/190) of the teeth survived. The overall success rate for the investigated teeth was 70.5% (134/190). Success rates of 100% for crown, 95.7% for post and core crown (PCC), and 94.7% for amalgam build-up with post were achieved. However, the success rates were 75%, 52.5%, and 50% for amalgam build-up, composite build-up, and PCC with crown lengthening, respectively. The Chi-square test revealed that there was a significant difference between the different restorations in terms of success (P<0.001). Multiple binary logistic regression models revealed that coronal leakage (P=0.048), obturation void (P=0.037), obturation length (P=0.020), mobility (P=0.002), type of the restoration (P<0.001), and proximal contact (P<0.001) were significant predictors for success. However, apicallucency, root length, marginal caries, tooth type, and post did not appear to be significant indicators of success (P>0.05).

ETT with minimal mobility, exhibiting underfilled obturations without visible voids, and having received crown/PCC/amalgam build-up with a post, along with the presence of both proximal contacts, tend to exhibit a significantly high success rate.

The coronavirus disease 2019 (Covid-19) has become a public health emergency of worldwide concern. In addition to the serious impacts of this disease, it has caused numerous problems for dental treatments. Here, the findings on the first phase of the cohort study on reopening the School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran and its subordinate clinics during the COVID-19 pandemic were reported. Data were collected via a 100-item self-administered online questionnaire from June 2 to June 20, 2020. A total of 1,110 members from the academics, students, and personnel of the school participated in the study. The questionnaire included demographic data, socio-personal patterns, systemic conditions, COVID-19 infection information, and personal protective equipment (PPE). Since the outbreak of the pandemic, 87.4% of the professors, 49.0% of the students, and 29.0% of the personnel of the school used personal vehicles other than public transportation. In addition, over 50.0% of the students and about 70.0% of the other two groups had not attended any gatherings. Moreover, 83.0% of the academics, 93.0% of the students, and 84.0% of the personnel had no systemic conditions. Furthermore, about 16.0% of the professors, 14.0% of the students, and 22.0% of the personnel had tested for the COVID-19 infection, of whom only about 1.0% reported positive results. Fatigue, dry coughs, and shortness of breath were the most common symptoms reported by the respondents. Dental offices are high-risk environments for the transmission of air-borne diseases. Considering the low percentage of the participants with positive test, it may be concluded that the safety protocols could effectively limit the spread of the COVID-19 infection.

The use of evidence-based dentistry (EBD) as the integration of investigations and clinical decisions has been a focus of attention in recent years.

The present study aimed to evaluate the knowledge, attitude, and practice of EBD among Iranian dentists in 2019.

A total of 140 self-administered questionnaires with 57 items were distributed among dentists in the 2019 exhibition of Iranian dentists. Moreover, 60 self-administered questionnaires were sent to five different dentistry schools in Iran. The analyses were carried out using the Chi-square test, independent samples t-test, and Pearson correlation.

A total of 119 fully-responded self-administered questionnaires were analyzed in this study. The dentists attending EBD workshops obtained significantly higher scores of knowledge. The Cochrane Library, manufacturer’s brochures, and evidence-based guidelines were used the least for clinical decisions. Consultation with colleagues, use of textbooks, and personal judgment were mostly utilized for clinical decisions. In addition, 93.3% of the participants stated sensible uncertainties in their clinical decisions. The most important barriersto EBD were the need for long discussions with patients, lack of skills in the critical appraisal of articles, and lack of motivation in dentists with the incidence rates of 62.2%, 62.2%, and 39.5%, respectively.

Due to the low levels of EBD knowledge among Iranian dentists, it is recommended to give further close attention to increasing the knowledge in this regard. However, their high enthusiasm for participation in EBD workshops and enhancement ofEBD skills is promising.

This double-blind, placebo-controlled, clinical trial aimed to investigate the analgesic efficacy of low-level laser therapy (LLLT) with two different locations, and their comparison, in postoperative endodontic pain (PEP) levels in molars diagnosed with symptomatic irreversible pulpitis.

Seventy-five patients with a molar tooth, diagnosed with symptomatic irreversible pulpitis, were divided into three groups of placebo, buccal only irradiation (BI), and buccal and lingual irradiation (BLI), with 25 cases being in each group. The participants received similar singlevisit nonsurgical endodontic treatments. Then, a sham laser was used in the control group instead of LLLT. Individuals in BI and BLI groups received 80-second irradiation on the buccal surface and 80-second irradiation on each of the buccal and lingual surfaces respectively. A laser with an 808 nm wavelength, power of 100 mW, a fiber diameter of 600 μm, and a dose of 70 J/cm2 was used. PEP was assessed using a 0-100 mm VAS 4, 8, 24, and 48 hours after the treatment.

BLI showed a significantly higher reduction of PEP compared to placebo in all time intervals of this study. BLI was significantly more effective than BI 8 hours after the treatment. However, intragroup differences between BLI and BI groups at other time intervals and between BI and placebo groups in all time intervals were not significant. The number of taken analgesics in the BLI group was significantly lower than the placebo group and was on a statistical borderline compared to the BI group.

LLLT with BLI was an effective measure as a supplement to oral analgesics in the reduction of PEP compared to the placebo.

It is necessary to determine due date in high risk pregnancies; in the other words, one of the important issues in pregnancy care is to estimate the pregnancy' citrine date. This survey was conducted to design and implement an educational software for determination the pregnancy age based on ultrasound and last menstrual period. It has been produced in three phase; after assessing female staff' needs, design and application of entering ultrasound's date and determining the pregnancy age according to week and day information was performed . An additional advantage was to be utilized by general people and its increase speed and accuracy. Considering increase population policy in today’s society, this program would be possible to plan and calculate newborn date and due discharge date as well as its needless of traditional pen and pape method against to its usable digital and electronic application. Therefore, this modern technique leads to the cure quality improvement and the wasted ime prevention and, in total, it would promote the public health too.