The bond strength of ActiV GP and gutta-percha/AH Plus after using 2% CHX as final rinse was evaluated in this study. According to the final irrigation regimen forty roots were divided into two groups (n = 20) randomly: Group 1-5 ml of 17% EDTA; Group 2-5 ml of 17% EDTA followed by 5 ml of 2% chlorhexidine gluconate (CHX). Based on the obturation system the two groups were further subdivided into two subgroups (n = 10). The roots were horizontally sectioned from the coronal and midthird sections for measuring the push-out bond strength. CHX/AH Plus (2.795 ± 0.42 MPa) and EDTA/ActiV GP (1.489 ± 0.117 MPa) recorded the highest and lowest mean bond strength values respectively. It was concluded that when 2% CHX was used as a final irrigation rinse the bond strength of both gutta-percha/AH Plus and ActiV GP obturation system improved significantly.
Background:Dentin desensitizers may change the properties of smear layer and have adverse effects on the bonding performance of adhesive systems.Aim:The aim of this study was to compare the effect of bioactive glass (BG), hydroxyapatite, and diode laser desensitization on shear bond strength of resin composites to dentin at different time intervals.Materials and Methods:Seventy-two caries-free maxillary premolars were selected. Buccal surfaces were flattened to expose dentin. Teeth were divided into four groups (Groups 1, 2, 3, and 4) according to treatment modality (control with no pretreatment, Sensodyne Repair and Protect, Teethmate Desensitizer, diode laser). Bonding was performed using self-etch adhesive followed by composite buildup. Universal testing machine was used to determine shear bond strengths immediately after bonding, after 3 months, and 5 months storage in artificial saliva.Results:Pretreatment with BG and hydroxyapatite desensitizers increased, whereas diode laser decreased mean shear bond strength of composite to dentin as compared to control group. No statistical significant difference in shear bond strength values was seen in groups after storage.Conclusion:Desensitizing toothpastes incorporating remineralizing agents not only occluded open dentinal tubules but also increased shear bond strength of composite to dentin.
Background: Dental anxiety is a significant and challenging problem in patients seeking dental treatment. During any dental procedure patients
often experience severe pre-operative and intra-operative anxiety which makes the procedure more difficult. Anxiety during endodontic therapy
often leads to increased pain perceptions and instability of the physiological parameter throughout treatment. Aim: The purpose of this study was to
evaluate the influence of music as a nonpharmacologic aid on anxiety, pain perception and physiological parameters (heart rate, systolic blood
pressure, and diastolic blood pressure) at three different time period - before, during, and after endodontic treatment.
Methods: A total of 100 patients were recruited in the present study. Before starting the endodontic treatment, the interviewer administered the
Modified Corah Dental Anxiety Scale (MCDAS) to assess the baseline level of anxiety and Visual Analog Scale (VAS) for pain assessment.
Patients were randomly divided into 2 groups: the first one listened to the music during endodontic treatment and the second one did not. Before,
during, and after the endodontic procedure, the physiological parameters (i.e. heart rate, systolic and diastolic blood pressure) were recorded. All
the data were collected and statistically analyzed.
Results: Direct contrasts between patients listening or not listening to music showed that all the measured physiological parameters improved
considering the overall period (during and after the root canal therapy) in the group of patients listening to music (P < .05). Conclusion: Within the
limitation of the study, music administered to subjects with different levels of anxiety during endodontic treatment significantly decreased pain
levels and improved physiological parameters during the endodontic procedures. Clinical Significance: Music and medicine always work together
and the soothing effects of sounds and musical frequencies make this union an extraordinary tool of synergistic care. Music therapy can be
considered as a valid nonpharmacologic aid to manage anxiety during endodontic treatment.
Context:
The resin–dentin interface is less durable, which reduces the longevity of tooth-colored restorations. To encounter this shortcoming, the use of nanotechnology to mimic biomineralization proves beneficial.
Aims:
This study was conducted to evaluate the effect of remineralization with strontium-doped nanohydroxyapatite (Sr-nHAp) with chitosan on shear bond strength of resin composite to dentin.
Materials and Methods:
Sixty five extracted human premolars were divided into five groups (
n
= 13) based on remineralization protocol as: Group A – 20% (Sr-nHAp) with chitosan, Group B – 10% (Sr-nHAp) with chitosan, Group C – 20% (Sr-nHAp) with simulated body fluid, Group D – 10% (Sr-nHAp) with simulated body fluid, and Group E – control. Following bonding, resin composite of specified dimension was built and was subjected to shear bond strength test after 24 h and 1 week using Universal Testing Machine, and mode of failure was assessed. ANOVA and paired sample
t
-test were used for analyzing the data, and the level of significance was set at 5%.
Results:
The highest value of shear bond strength was obtained from Group A after aging for a week, and there is a significant increase in the value of all the groups as compared to the control group after 1 week of storage than 24 h.
Conclusions:
Remineralization with Sr-nHAp and chitosan has positively improved the bond strength of resin to dentin at the end of 1 week.
Regulatory cellular process of mesenchymal stem cell remains to be explicated in diseased condition. On the other hand, platelet-derived growth factors (PDGFs) are known to shape the migratory movements of the mesenchymal cells during stressful conditions. The objective of the current study is to understand the role of Recombinant Platelet-Derived Growth Factors-BB (rhPDGF-BB) towards proliferation and migration of Human Dental Pulp Stem Cells (hDPSC). The cytotoxicity of rhPDGF-BB was assessed at various doses and its chemotactic response was measured by experimental wound scratch test. The recombinant protein did not show cytotoxicity at higher doses. It was found that rhPDGF-BB is a strong inducer of indiscriminate as well as directional migration of hDPSCs that persisted upon 24hrs. Thus, the experiment demonstrates critical use of rhPDGF-BB in regenerative process during dental pulp stem injury.
The Covid-19 has changed the life of the entire world and its wave has affected all elds of medicine and dentistry. The concern about coronavirus
transmission and dental practice has been widely recognized around the world.The purpose of this survey was to investigate the inuence of
coronavirus disease on patients' views with regards to their dental treatment requirements. Materials and methods: It is a cross-sectional survey
conducted over 430 patients seeking dental treatment in Ramaiah dental college and hospital Bangalore, Karnataka, India. This survey has been
conducted through electronic communication applications such as WhatsApp and Gmail, for three months. A structured and validated
questionnaire was administered to the study subjects. Collected data were analyzed by using descriptive statistics.
Results:Atotal of 1000 patients were selected for the survey, in this only 43% of subjects completed the survey. Out of 430 responses, 50.1% of the
subjects had dental problems. 38.3% of subjects expressed the unavailability of dental clinics and hospitals during Covid-19, 31.4% unavailability
of the dentist. Of the 42.9% of patients who visited the dental clinic during the covid-19 pandemic, 38% of subjects observed the increase in
treatment cost, only 30.5% of subjects were provided with emergency treatment. The majority of subjects (75.7%) expressed that dentists are
practicing good precautionary measures such as wearing PPE kits, mouth masks etc. Conclusion: During the coronavirus pandemic, the patients
demonstrated good knowledge and an optimistic attitude towards the precautionary modications in regard to minimize the spread of COVID-19
in the dental setting.
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