Aims:To compare the shear bond strength of sixth generation and seventh generation bonding agents to dentin.Materials and Methods:Eighty human maxillary premolars were reduced to expose flat surface of dentin and divided into four equal groups, which were bonded using following bonding agents: Sixth generation bonding agents, Adper SE Plus and Xeno III and Seventh generation bonding agents, Adper Easy One and Xeno V. Composite cylinders were then built using a plastic mould on these prepared dentinal surfaces. Samples were stored in distilled water for 24 hours and tested for shear bond strength with universal testing machine. Shear force was applied perpendicular to the long axis of composite cylinder at adhesive-tooth interface until debonding occurred. The data so obtained were tabulated and analyzed statistically using independent-samples t test and analysis of variance (ANOVA) testResults:The seventh generation adhesives showed significantly higher shear bond strength to dentin compared to sixth generation adhesives (P < 0.01). The highest value of shear bond strength was obtained from Adper Easy One system, while Adper SE Plus gave the lowest shear bond strength values.Conclusions:Seventh generation adhesives are more advantageous than sixth generation adhesives in dentin bonding as it requires less time, fewer steps, and better bond strength.
Background:Like in any other profession, dental surgeons are also afflicted by many occupational health hazards such as Musculoskeletal disorders (MSD) and mental health related issues.Aims:To assess the distribution of MSD and mental health related issues amidst dentists in Salem City according to age, sex and number of working hours per week.Objectives:A survey was organized to check the rate of occurrence of these occupational health hazards among dental practitioners in Salem city.Materials and Methods:The study was conducted among one hundred and fifty dentists practicing in Salem City in the form of questionnaire. Dentists were asked about any occupational disease that they suffered related to a musculo–skeletal pain and its location whether in the back, upper limbs or lower limbs. In addition to this, dentists were asked about mental stress that they had experienced.Results:MSD showed higher rate of prevalence compared to mental health related issues.Conclusion:The application of preventive measures is necessary, in view of the high rate of these disorders in the society of dental practitioners.
Aim and Objective:To evaluate the in vitro effect of red wine on color stability of three different esthetic restorative materials such as nanohybrid composites, conventional restorative glass ionomer cement (GIC), and feldspathic porcelain.Materials and Methods:The color stability of test materials was determined using a spectrophotometer. A total of 30 specimens were prepared (10 from each) from each material on a round metal mold (11 mm diameter and 2 mm deep). The specimens were stored in distilled water at 37°C for 24 h for rehydration. Baseline color of all groups was recorded. Specimens of each material were divided into 2 groups of 5 specimens each (n = 5). Two groups include red wine and distilled water as a control. Specimens were then immersed in 25 ml of red wine for 20 min at room temperature everyday for 28 days. Specimens were kept in distilled water for the remaining part of days. After the completion of immersion sequence, the specimens were rinsed with distilled water and blotted dry. Postimmersion color of all specimens was then recorded. Data were analyzed by two-way ANOVA and post hoc Tukey's test.Results:The color stability is significantly higher in porcelain than composite and conventional GIC.Conclusion:Within the limitations of this study, it was concluded that the porcelain shows less discoloration than composite and conventional restorative GIC.
Background: Similar to several other occupations, dentists are also stricken by bounteous occupational health hazards (OHHs) such as musculoskeletal disorders (MSDs) and ocular health–related issues. Aims: The aim of this study was to evaluate the diffusion of MSDs and ocular health–related issues among dental surgeons in Salem city, Tamil Nadu, India, according to age, sex, and number of practicing hours per week. Objectives: A survey was conducted to examine the rate of prevalence of these OHHs amidst the dental surgeons in Salem city. Materials and Methods: The study was performed through a questionnaire amidst 150 dentists practicing in Salem City, Tamil Nadu, India. Dental surgeons were questioned about any occupational disorder that they had experienced related to a musculoskeletal pain and its location whether in the back, upper limbs, or lower limbs. In extension to this, dental surgeons were asked about any ocular injury that they had. Results: MSD showed higher rate of occurrence correlated to ocular health–related issues. Conclusion: The practice of protective measures is crucial, in perspective of the high rate of these disorders in the community of dental surgeons.
The aim of the study was to compare In-vitro the micro tensile bond strength of sixth generation (Clearfil SE Bond, Kuraray, Japan), seventh generation (Adper Easy One, 3 M ESPE, Germany) and eighth generation ((Futurabond DC, Voco, Germany) dentin bonding agents. Twenty freshly extracted caries free, unrestored human molars were selected. The occlusal surfaces were ground flat; divided into four groups of five each according to the bonding agent applied and covered with composite resin (10 mm in height). The teeth were sectioned into one mm thick specimens with a cross sectional area of 1 mm square in hard tissue microtome and subjected to tensile force in a universal testing machine. The highest strength was seen in 8th generation bonding agent (Futura bond DC, Voco, Germany) 34.9332 MPa followed by 6th generation bonding agent 32.3477 MPa (Clearfil SE Bond, Kuraray dental, Japan) and the 7th generation agent 31.8826 MPa (Adper Easy One, 3M ESPE, Germany) respectively. The eighth generation dentin bonding agent appeared to be more advantageous in bonding than sixth and seventh generation dentin bonding agents
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