Publications by authors named "Shivsagar Tewary"

8 Publications

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Comparative evaluation of frictional resistance of extracoronal attachments of different designs and lengths in fixed partial denture: A finite element analysis.

J Indian Prosthodont Soc 2021 Jan-Mar;21(1):99-105

Department of Prosthodontics and Crown and Bridge, School of Dental Sciences, KIMS-DU, Karad, Maharashtra, India.

Aim: The purpose of the study was to evaluate the frictional resistance and the vertical force required to achieve the frictional resistance for different length and designs of extracoronal attachments used in fixed partial denture (FPD).

Setting And Design: Finite element analysis.

Materials And Methods: Four different designs and five different lengths (3 mm, 3.5 mm, 4 mm, 4.5 mm, and 5 mm) of extracoronal attachments for FPD were selected from different manufacturers. Three-dimensional models of all the samples were simulated using Catia V5 software. The properties were incorporated to the software to simulate the clinical conditions. The frictional resistance and the vertical force required to achieve frictional resistance were analyzed using ANSYS workbench 15.0 finite element software.

Statistical Analysis Used: ANOVA and Tukey's post hoc test.

Results: The mean microhardness of the Variolink N resin cements were significantly higher than Panavia SA ones (P < 0.001). Variolink N cements exhibited lower sorption/solubility than Panavia SA resin cements (P < 0.05). The ceramic shade had a significant influence on the microhardness of both cements (P < 0.001) but had no significant effect on the sorption/solubility of resin cements (P > 0.05).

Conclusion: Interposition of monolithic zirconia decreases the microhardness of resin cement especially Panavia SA. The microhardness decreased in Variolink N with the increase in the chroma saturation of ceramics. However, in Panavia SA, it was altered by the shades. For both cements, there were no statistical differences between the sorption/solubility. There was a reverse correlation between microhardness and water sorption/solubility of both cements.
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http://dx.doi.org/10.4103/jips.jips_463_19DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8061438PMC
January 2022

Evaluation of the effect of ultraviolet light polymerized clear adhesive on shear and tensile bond strength of heat cure denture base resin to the cobalt-chromium retentive minor connector: An study.

J Indian Prosthodont Soc 2020 Oct-Dec;20(4):394-401. Epub 2020 Oct 8.

Department of Prosthodontics and Crown and Bridge, School of Dental Sciences, KIMS-DU, Karad, Maharashtra, India.

Aim: The aim of this study is to evaluate the efficacy of new material ultraviolet (UV) light polymerized clear adhesive on shear and tensile bond strength of heat cure denture base resin (Polymethylmethacrylate (PMMA)) to cobalt-chromium (Co-Cr) retentive minor connector.

Setting And Design: Comparative evaluation- In-vitro study.

Materials And Methods: Sixty samples of Co-Cr plates mimicking minor connectors were fabricated. Thirty samples were coated with new material UV light polymerized clear adhesive and cured under UV light source for 10 min. In gun-metal flask, metal plates were placed in the lower compartment over it. Heat cure acrylic resin was packed in the dough stage with the help of clamps and processed according to the manufacturer's instructions. Samples were kept in artificial saliva for 90 days. Shear and tensile bond strengths were calculated of each sample with a Universal testing machine, and results were statistically analyzed. Type of bond failure was observed for each sample under stereomicroscope.

Statistical Analysis Used: Unpaired t test.

Results: Tensile bond strength, as well as shear bond strength, showed that 0.93 N and 1.64 N respectively for without application of new adhesive was more as compared to that of samples with the application of new adhesive which is 0.75 N and 1.54 N respectively. Bond failure was found to be an adhesive failure in resin-metal interface.

Conclusions: Excellent bonding seen between the new adhesive and acrylic interface but limited effect on the metal interface. To increase bond strength between metal and resin interface, some surface treatment with the metal surface is needed to increase the bonding of the new adhesive to the metal surface.
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http://dx.doi.org/10.4103/jips.jips_85_20DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7814690PMC
October 2020

Anchored guided rehabilitation.

J Indian Prosthodont Soc 2020 Jul-Sep;20(3):321-325. Epub 2020 Jul 17.

Department of Prosthodontics and Crown and Bridge, School of Dental Sciences, KIMS-DU, Karad, Maharashtra, India.

The loss of mandibular continuity leads to difficulty in swallowing, problems in mastication, altered mandibular movement, impaired speech articulation, and cosmetic disfigurement. Rehabilitation of such patients becomes more challenging in the case of complete edentulous maxillary and mandibular arches due to a lack of support and anchorage. This case report describes prosthetic rehabilitation of completely edentulous arches with segmental mandibulectomy. Hence, the anchorage was provided with the help of osseointegrated implants in both the maxillary and mandibular arches. Deviation of the mandible toward the unresected side during mastication and other functions was corrected using a palatal ramp. An attempt was made for prosthetic rehabilitation of mandibulectomy defect which required a multidisciplinary approach and which fulfilled the patient's requirement of mastication.
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http://dx.doi.org/10.4103/jips.jips_311_19DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7654201PMC
July 2020

A split-mouth clinico-radiographic comparative study for evaluation of crestal bone and peri-implant soft tissues in immediately loaded implants with and without platelet-rich plasma bioactivation.

J Dent Res Dent Clin Dent Prospects 2019 14;13(2):117-122. Epub 2019 Aug 14.

Department of Prosthodontics and Crown & Bridge, School of Dental Sciences, KIMSDU, Karad, India.

This study evaluated the viability of platelet-rich plasma for enhancement of osseous and associated soft tissue healing around single-piece implants, subjected to immediate loading and to compare it with a control site not treated with PRP. Twenty completely edentulous patients were selected and 2 one-piece implants with O-ball head were placed for mandibular overdenture. The implant on the right side was treated with PRP whereas the left side implant served as a control. All the cases were immediately loaded and marginal bone loss, probing depth, percussion, implant mobility and peri-implantitis were assessed and compared at 3, 6, 9 and 12 months. Overall analysis of the results showed less marginal bone loss, probing depth, percussion, implant mobility and periimplantitis around implants treated with PRP; however, the results were insignificant statistically. PRP can be used as a viable treatment adjunct in immediately loaded one-piece implants.
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http://dx.doi.org/10.15171/joddd.2019.018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6773920PMC
August 2019

Traumatic bone cyst of an anterior mandible with previous symphyseal fracture in a pediatric patient: a rare finding and etiopathologic correlation.

Gen Dent 2017 Nov-Dec;65(6):e5-e8

Traumatic bone cysts (TBCs) are uncommon intraosseous lesions, classified as pseudocysts because they lack an epithelial membrane lining. The etiology of a pseudocyst has not been determined. Various hypotheses have been put forward to explain its pathogenesis, of which the traumatic-hemorrhagic theory is the most commonly accepted. Minor trauma, insufficient to cause fracture or iatrogenic injury, is commonly implicated as the stimulus initiating cyst formation. A TBC presenting after jaw fracture has been rarely reported in the literature. This article presents a case of a TBC of the anterior mandible in a child with a previous history of trauma and fracture of the symphysis. The article also reviews the literature to corroborate the possible role of major trauma in the pathogenesis of TBC.
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July 2018

Dental, dermatological and radiographic findings in a case of Gorlin-Goltz Syndrome: report and review.

Pan Afr Med J 2017 7;27:96. Epub 2017 Jun 7.

Department of Prosthodontics School of Dental Sciences, KIMSDU, Karad, Maharashtra, India.

Gorlin-Goltz syndrome (GGS) is a rare autosomal dominant disorder. The disease shows multiple organ involvement with variable clinical presentation. Thus a multidisciplinary approach is required for its prompt clinical diagnosis and management of this condition. This paper highlights a case of GGS presenting in a young male patient with cranial, facial, dermatological, dental and skeletal involvement. The diagnosis of the syndrome was based on its clinical presentation, radiological features and histopathological findings. A review of the diagnostic criteria is also presented.
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http://dx.doi.org/10.11604/pamj.2017.27.96.12025DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5554634PMC
September 2017

An In vitro Comparative Evaluation of Disinfectants on Standard and Clinical Microbial Strains on Heat Cure Resins.

J Clin Diagn Res 2017 May 1;11(5):ZC54-ZC58. Epub 2017 May 1.

Reader, Department of Oral and Maxillofacial Surgery, School of Dental Sciences, Krishna Institute of Medical Sciences Deemed University, Malkapur, Karad, Maharashtra, India.

Introduction: Oral cavity is colonised by numerous micro-organisms that form a biofilm on the acrylic resin. Hence, routine hygiene is essential to prevent oral mucosal inflammation and lesions. Knowledge of appropriate disinfecting agents for acrylic resins is crucial in this context.

Aim: To compare and evaluate the effectiveness of four commercially available disinfectants on heat cure acrylic resin specimens contaminated with standard and clinical strains of two micro-organisms commonly inhabiting the oral microflora.

Materials And Methods: Two hundred acrylic resin specimens (n=200), 10 in each group were contaminated in vitro with 1x10 cells/ml suspensions of standard and clinical strains of micro-organisms and were immersed in four disinfectants (1% sodium hypochlorite, 2% chlorhexidine digluconate, 2% glutaraldehyde and 3.8% sodium perborate) for 10 minutes. The control group was not subjected to any disinfection process. For collection of clinical strains, oral swab was passed over the buccal mucosa and grown on blood agar culture media. Organism confirmation was done by growing them on selective culture media. Final counts of micro-organisms per ml were performed by plating method for evaluation of microbial level reduction. Results obtained were subjected to ANOVA and Tukey's test.

Results: Standard strains of (C) and (S) subjected to various disinfectants showed varied mean Colony Forming Units per ml (CFU/ml) from <10,000 to 25,000 and <10000 to <50,000 respectively. Clinical strains and of (C) and (S) subjected to various disinfectants showed varied mean CFU/ml from <10,000 to 50,000 and from 10,000 to 50,000 respectively. Control groups showed maximum mean CFU/ml (>10). All intergroup comparisons were highly significant (p<0.001; HS) and intragroup comparisons were significant (p<0.05; S) except the comparison of clinical strains of subjected to 2% chlorhexidine digluconate and 2% glutaraldehyde which was found to be non significant (p>0.05; NS).

Conclusion: Almost 1% sodium hypochlorite was found to be the most effective disinfectant for both and . The least effective disinfectant being: 3.8% sodium perborate.
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http://dx.doi.org/10.7860/JCDR/2017/24759.9866DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5483810PMC
May 2017

Evaluation of linear dimensional accuracy of hard chairside and laboratory heat cure reline resins at different time intervals after processing.

Indian J Dent Res 2014 Nov-Dec;25(6):686-91

Department of Prosthodontics, School of Dental Sciences, Krishna Institute of Medical Sciences, Deemed University, Malkapur, Karad, Satara, Maharashtra, India.

Context: Relining with heat cure denture base resin is time-consuming and the patient has to remain without dentures within this period. Recently, some autopolymerizing resins marketed as hard chairside reline systems with low exothermic heat allow the dentists to reline prosthesis directly in the mouth. However, the decision to use these materials must be based on physical properties such as dimensional accuracy that directly influences the accuracy of fit of the denture base.

Aim: The aim was to compare the linear dimensional changes of two hard chairside reline resins with two laboratory heat cure resins at 3 times intervals after processing.

Settings And Design: A stainless steel split mold (International Organization for Standardization 1567) was used for sample fabrication. Five measurements of the reference dimensions (AB and CD) were measured directly from the mold and the samples with a profile projector, and mean difference were calculated.

Subjects And Methods: Forty samples were fabricated by incorporating the split mold into first pour of denture flasks and packing each of the chairside reline resins ("Kooliner" and "Ufi Gel Hard") and laboratory heat cure resins ("Dental Products of India Heat Cure" and "Trevalon"). The mean difference in dimensional change at 3 times intervals (0 h, 4 days and 2 months) were calculated and subjected to statistical analysis.

Statistical Analysis Used: One-way ANOVA, RMANOVA and post hoc Tukey's tests.

Results: All resins showed different levels of significant shrinkage (P<0.001) after processing (T0) ranging from -0.128 to -0.310 mm. After 4 days (T1), there was significant shrinkage (P<0.001) ranging from -0.168 to -0.296 mm. After 2 months (T2), there was again significant shrinkage (P<0.001) ranging from -0.018 to -0.216 mm. Chairside reline resins showed less dimensional shrinkage at each time interval than the laboratory heat cure resins.

Conclusions: Hard chairside resins are dimensionally accurate than the laboratory heat cure resins.
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http://dx.doi.org/10.4103/0970-9290.152162DOI Listing
October 2015