Prasanth V
Professor(CAP), Prosthodontics, Govt. Dental College, Trivandrum. PhD Guide - KUHS. Section Editor - JIPS. Guest Editor - JPID. Founder Editor - Indian Prosthodontic Society, Kerala State (2017-2023). Academy Mentor- Web of Science. Member - Training of Trainers under KUHS. Reviewer - Special Care in Dentistry, Journal of Pharmacy and Bioallied Sciences, IP Annals of Prosthodontics and Restorative Dentistry and IJSRDMS. Editor - The Journal of Dental Panacea
Phone: +919846909058
Address: Professor (CAP), Government Dental College, Trivandrum
Phone: +919846909058
Address: Professor (CAP), Government Dental College, Trivandrum
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Papers by Prasanth V
Material and methods -Specimens(N=40)ofspecifieddimensionswerefabricatedinFactorIIroomtemperaturevulcanizing (RTV) silicone and processed according to the manufacturer’s instructions. Two groups were classified with 20 specimens each. Specimens in the first group were coated with titanium dioxide (TiO2) by atomic layer deposition technology. The colour stability test was conducted with a UV–VIS spectrometer (Schimadzu) for both titanium dioxide nanocoated and uncoated specimen groups after subjecting them to accelerated ageing. It was analysed using the CIE L*a*b method.
Results The average colour change was highest for uncoated specimens (2.868), and the average colour change for titanium dioxide-coated specimens was significantly low (1.774). The average colour change of uncoated specimens (2.868) was close to the acceptable threshold value (3), and that of coated specimens (1.774) was far below the acceptable threshold (3). Conclusions The colour change that occurred in titanium dioxide nanocoated specimens following accelerated ageing was significantly lower than that in the uncoated group, showing that the TiO2 nanocoating was effective in reducing the colour degradation of silicone elastomers.
Clinical relevance Maxillofacial prostheses fabricated from silicone elastomers go through undesirable colour degradation over time. The development of a scientific technique that retards the colour deterioration of silicone prostheses would be of great clinical significance.
implant bed preparation.
revealed that the null hypothesis was ruled out. Expasyl paste caused the greatest horizontal retraction.The largest vertical retraction was obtained by the impregnated stayput cord. The best hemostatic effect was shown by the magic foam gel retraction system. Applying Expasyl paste to the sulcus required less time.
(P < 0.01), and 6 hours (P < 0.061 and P < 0.020) alongside with DB1 & DB2, DBI & DB3, and DB2 & DB3 at 12
hours (P < 0.01) were found to be statistically significant. The tensile bond strengths variations of Fittydent with
DB1 & DB3 and DB2 & DB3 at 3 hours (P =0.013, P =0.012) and 6 hours (P < 0.01), and DB2 & DB3 at 12 hours
(P=0.015), was statistically significant at 0.05 level.
The study investigated the efficacy of three different laboratory techniques viz,
a. Posterior palatal strap
b. Polyaramid ber reinforcement, and
c. Glass ber reinforcement, in decreasing the posterior palatal shrinkage of denture bases that occur during processing.
Materials and methods
Forty identical maxillary edentulous casts were made from high strength dental stone using a standard exible rubber mold. An undersized
wax occlusal rim was made which was duplicated in heat cure acrylic resin to be used as a standard jig throughout the study to regulate the
volume of resin. Forty casts were divided into 4 groups; Group I – Control, Group II- posterior palatal strap , Group III- Kevlar 49 ber
reinforcement, and Group IV- Glass ber reinforcement. The casts for posterior palatal strap were altered by addition of box at the base of
the cast which served as a mechanical lock. In case of Kevlar ber and Glass ber reinforcement, pre-pregs were incorporated in the base
during the packing stage. Twenty-four hours after polymerization the bases on their casts were sectioned at the posterior border at predesignated points and evaluated for degree of adaptation using a high resolution microscope.
Results and Conclusion
Statistical analysis was performed using analysis of variance followed by 95% condence interval test. The maximum gap was noted in mid
palatine region (0.132mm) followed by maxillary tuberosity region (0.005mm) in control group. There was no measurable gap between the
cast and denture base in any of the three different laboratory techniques compared. The study concluded that the ber reinforcement
technique was simply the best and most efficient when compared with the other techniques.
any other artificial organs used in human body, complete dentures
have received a high degree of success .But maxillary complete
dentures always have problems such as excessive tissue coverage,
altered taste and temperature sensations and reduction in oral
volume. These can be minimized to a certain extent by reducing
the coverage of the palate. Very often this is not attempted for
fear of loss of retention. Palate less complete denture is an alternative denture for upper edentulous patients in case of gagging,
large palatal torus and restoring the lost taste perception. Palate
less complete denture will restore the lost good tastes, comfort
and normal physiology of tissue to edentulous mouth and a good
alternative to full palatal coverage dentures [1]. The anatomy and
neuromuscular control of the tissues in and around the denture
bearing area helps in the retention of the complete maxillary denture even if the palatal coverage is reduced. Reduction of palatal
coverage reduced gagging tendency [2]. Palate less dentures in U
shape was more comfortable and effective like conventional dentures with complete palatal coverage [3]. The aims of the study
were to evaluate the effect of reduction of palatal coverage to
twenty percent of total area over denture retention and to compare and evaluate the subjective response of denture wearers to
dentures with conventional palatal coverage and reduced palatal coverage.
incisal reduction, ‘incisal butt joint’ design was the design of choice
Material and methods -Specimens(N=40)ofspecifieddimensionswerefabricatedinFactorIIroomtemperaturevulcanizing (RTV) silicone and processed according to the manufacturer’s instructions. Two groups were classified with 20 specimens each. Specimens in the first group were coated with titanium dioxide (TiO2) by atomic layer deposition technology. The colour stability test was conducted with a UV–VIS spectrometer (Schimadzu) for both titanium dioxide nanocoated and uncoated specimen groups after subjecting them to accelerated ageing. It was analysed using the CIE L*a*b method.
Results The average colour change was highest for uncoated specimens (2.868), and the average colour change for titanium dioxide-coated specimens was significantly low (1.774). The average colour change of uncoated specimens (2.868) was close to the acceptable threshold value (3), and that of coated specimens (1.774) was far below the acceptable threshold (3). Conclusions The colour change that occurred in titanium dioxide nanocoated specimens following accelerated ageing was significantly lower than that in the uncoated group, showing that the TiO2 nanocoating was effective in reducing the colour degradation of silicone elastomers.
Clinical relevance Maxillofacial prostheses fabricated from silicone elastomers go through undesirable colour degradation over time. The development of a scientific technique that retards the colour deterioration of silicone prostheses would be of great clinical significance.
implant bed preparation.
revealed that the null hypothesis was ruled out. Expasyl paste caused the greatest horizontal retraction.The largest vertical retraction was obtained by the impregnated stayput cord. The best hemostatic effect was shown by the magic foam gel retraction system. Applying Expasyl paste to the sulcus required less time.
(P < 0.01), and 6 hours (P < 0.061 and P < 0.020) alongside with DB1 & DB2, DBI & DB3, and DB2 & DB3 at 12
hours (P < 0.01) were found to be statistically significant. The tensile bond strengths variations of Fittydent with
DB1 & DB3 and DB2 & DB3 at 3 hours (P =0.013, P =0.012) and 6 hours (P < 0.01), and DB2 & DB3 at 12 hours
(P=0.015), was statistically significant at 0.05 level.
The study investigated the efficacy of three different laboratory techniques viz,
a. Posterior palatal strap
b. Polyaramid ber reinforcement, and
c. Glass ber reinforcement, in decreasing the posterior palatal shrinkage of denture bases that occur during processing.
Materials and methods
Forty identical maxillary edentulous casts were made from high strength dental stone using a standard exible rubber mold. An undersized
wax occlusal rim was made which was duplicated in heat cure acrylic resin to be used as a standard jig throughout the study to regulate the
volume of resin. Forty casts were divided into 4 groups; Group I – Control, Group II- posterior palatal strap , Group III- Kevlar 49 ber
reinforcement, and Group IV- Glass ber reinforcement. The casts for posterior palatal strap were altered by addition of box at the base of
the cast which served as a mechanical lock. In case of Kevlar ber and Glass ber reinforcement, pre-pregs were incorporated in the base
during the packing stage. Twenty-four hours after polymerization the bases on their casts were sectioned at the posterior border at predesignated points and evaluated for degree of adaptation using a high resolution microscope.
Results and Conclusion
Statistical analysis was performed using analysis of variance followed by 95% condence interval test. The maximum gap was noted in mid
palatine region (0.132mm) followed by maxillary tuberosity region (0.005mm) in control group. There was no measurable gap between the
cast and denture base in any of the three different laboratory techniques compared. The study concluded that the ber reinforcement
technique was simply the best and most efficient when compared with the other techniques.
any other artificial organs used in human body, complete dentures
have received a high degree of success .But maxillary complete
dentures always have problems such as excessive tissue coverage,
altered taste and temperature sensations and reduction in oral
volume. These can be minimized to a certain extent by reducing
the coverage of the palate. Very often this is not attempted for
fear of loss of retention. Palate less complete denture is an alternative denture for upper edentulous patients in case of gagging,
large palatal torus and restoring the lost taste perception. Palate
less complete denture will restore the lost good tastes, comfort
and normal physiology of tissue to edentulous mouth and a good
alternative to full palatal coverage dentures [1]. The anatomy and
neuromuscular control of the tissues in and around the denture
bearing area helps in the retention of the complete maxillary denture even if the palatal coverage is reduced. Reduction of palatal
coverage reduced gagging tendency [2]. Palate less dentures in U
shape was more comfortable and effective like conventional dentures with complete palatal coverage [3]. The aims of the study
were to evaluate the effect of reduction of palatal coverage to
twenty percent of total area over denture retention and to compare and evaluate the subjective response of denture wearers to
dentures with conventional palatal coverage and reduced palatal coverage.
incisal reduction, ‘incisal butt joint’ design was the design of choice