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RISS 인기검색어
- 검색키워드
- 저자 : Hariharan Ramasubramanian (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Ambedkar Elumalai,Saravanakumar Mariappan,ChitraShankar Krishnan,Hariharan Ramasubramanian,Jayakrishnakumar Sampathkumar,Hariharan Ramakrishnan,Azhagarasan Nagarasampatti Sivaprakasam,Vallabh Mahadeva 대한치과이식임플란트학회 2021 The Korean Academy of Implant Dentistry Vol.40 No.3
The purpose of this study was to comparatively evaluate the rigidity and accuracy of three different elastomeric impression materials with an open tray implant level impression technique. In Part, I of the study a total of thirty open tray implant level impressions were made with vinylpolysiloxane (n=10), polyether (n=10), and vinylsiloxanether (n=10) impression materials. Implant replicas were connected to the impression coping using a digital screw torque checker. The peak torque values were recorded indicating the maximum rigidity of each group. The mean values were obtained and statistically analyzed using one-way ANOVA and Post-hoc HSD test. In Part II of the study, a total of thirty impressions were made with vinylpolysiloxane (n=10), polyether (n=10), and vinylsiloxanether (n=10) impression materials similarly. Implant replicas were connected to the impression coping with 5 Nㆍcm torque for vinylpolysiloxane and polyether groups. A gentle hand tightening was given to the vinylsiloxanether group. The master casts were poured. Subsequently, linear angle and vertical distance were measured using a coordinate measuring machine. The mean values were obtained and statistically analyzed using one-way ANOVA, posthoc Tukey HSD, and independent t test. Vinylpolysiloxane showed the maximum rotational resistance followed by polyether and the least by vinylsiloxanether and were statistically significant (P<0.05). Polyether showed the least rotational discrepancy than the vinyl polysiloxane and vinylsiloxanether and was statistically significant (P<0.05). Vinylpolysiloxane showed the least vertical discrepancy than the vinylsiloxanether and polyether without any statistical significance (P>0.05). Among the elastomeric impression materials used in this study, vinylpolysiloxane showed the maximum rotational resistance, polyether showed the least rotational discrepancy and the vertical discrepancy of these three materials was not significant.
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Aswana Jaiprakash,Jayakrishnakumar Sampathkumar,Chitrashankar Krishnan,Hariharan Ramasubramanian,Hariharan Ramakrishnan,Rahmath Shameem,Nagarasampatti Sivaprakasam Azhagarasan 대한치과이식임플란트학회 2021 The Korean Academy of Implant Dentistry Vol.40 No.3
Purpose: This study was conducted to comparatively evaluate the wear resistance of three different materials used for provisional implant supported restorations. Materials and Methods: Thirty natural mandibular first premolar teeth were considered as antagonist teeth specimens. Ten samples each of milled Polymethylmethacrylate (milled PMMA, GROUP I), milled Polyetheretherketone (milled PEEK, GROUP II) and indirect composite resin (SR ADORO, GROUP III) were designated as disc samples. The samples were subjected to wear test in a pin-on- disc machine. Surface roughness wear rate coefficient of friction and volume loss were measured after wear testing. The results were analyzed using paired ‘t test, Analysis of variance, and Post- hoc Tukey s HSD analysis. Scanning electron microscopic analysis was done for one representative tested sample from each test group. Results: Mean surface roughness (Ra) values before and after wear test for GROUPS I, II and III were 0.827 μm, 6.021 μm, 0.473 μm, and 1.194 μm, 0.455μm and 1.407 μm respectively. Mean wear rates (mg/min) of GROUPS I, II & III were 0.000 ,0.010 and 0.011 respectively. Mean coefficients of friction (μ) of Groups I, II & III were 0.979, 0.864 and 0.840 respectively. Mean volume loss (mm3) of GROUPS I, II & III were 6.709, 7.726 and 5.244 respectively. Scanning electron microscopic analysis revealed prominently roughened surface for GROUP I, moderately roughened surface for GROUP III and smoother surface for GROUP II. Milled Polymethylmethacrylate exhibited significantly higher surface roughness both before and after wear test as compared to both milled Polyetheretherketone and composite materials, which was corroborated by surface profilometry and Scanning electron microscopic analysis. Conclusions: Milled Polymethylmethacrylate showed significantly higher wear as compared to other two materials indicative of least wear resistance among the test materials. Milled Polyetheretherketone exhibited a marginally smoother surface compared to composite. Milled Polyetheretherketone and composite showed marginal differences in wear resistance which was statistically insignificant, indicative of similar wear resistance of these two test materials.
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