ABSTRACT
Objectives: To evaluate the anti-candida properties of tea tree oil as an additive to heat cured acrylic resin. Materials and methods: Total 24 heat cured samples were prepared without the addition of oil (control), and 24 with additives (20% of pure natural tea tree oil). These disks were inoculated with 0.1 mL of Candida albicans standard inoculum and were rinsed with 0.9% NaCl to remove the loosely attached cells from the surface of the discs. Sabouraud’s dextrose agar plate was used for measuring the attached yeast. The control and treated disks have been placed in distilled water for 1 day, 21 days and 42 days and washed daily with wet cotton. Results: CFU the mean colony forming units for control disks were placed in water and cleaned with wet cotton for 1 day, 21 days and 42 days was 1.5000, 5.0000, 1.0000, respectively and CFU for disks with tea tree oil decreased to 0.8750, 1.6250 and 0.3750 after 1 day, 21 days and 42 days. Tea tree oil incorporated specimens were effective in reducing the growth of C. albicans after storage for 42 days in distilled water. Conclusion: There was a significant reduction in the growth of C. albicans after the addition of oil to heat cured acrylic resin which suggests a new oral topical treatment for denture stomatitis.
ABSTRACT
Objective:To evaluate the effects of different denture cleaners on the discoloration of heat-cured denture base resin and artificial teeth.Methods:40 same specifications of the heat-curing denture base resin and 40 artificial central incisors were immerced in an acombination stain of coffee,tea and soy sauce for 4 weeks.Then specimens and artificial teeth were randomly distributed into 4 groups and soaked in Polident,Steradent,0.5％ sodium hypochlorite solution and distilled water for 4 hours respectivelly(n =10).Color differences(△E) were measured by using a colorimeter and a denture spectrophotometer before and after staining,and after cleaning.Results:Before or after staining there was no difference of △E among the groups of denture base risn or artificial teeth(P ＞ 0.05).After cleaning the denture base resin and the artificial teeth in the group of 0.5％ sodium hypochlorite solution presented higher △E than the other groups(P ＜ 0.05),in group of distilled water presented lower △E than the other groups(P ＜ 0.05).No significant difference was found between Polident group and Steradent group(P ＞0.05).The △E of the denture base resin and artificial teeth.in distilled water group before staining and after cleaning were the highest among the groups(P ＜0.05).Conclusion:0.5％ sodium hypochlorite solution,Polident and Steradent are effective in removing the discoloration from the heat-cured acrylic resin and artificial teeth.0.5％ sodium hypochlorite solution is the most effective,Polident and Steradent are the similar.
ABSTRACT
Objective:To evaluate the effects of different denture cleansers on the physical and mechanical properties of heat-cured denture base resin.Methods:Heat-curing denture base resin samples were prepared and respectively immersed in Polident,Stera-dent,0.5% sodium hypochlorite solution and distilled water for 60 h.The flexural strength and elastic modulus were measured(n =10)using 3-point bending test in a universal testing machine.A surface analyzer was used to measure the surface roughness of each specimen(n =10).Results:There were no significant differences of flexural strength and elastic modulus among Polident,Steradent and distilled water(P >0.05).The 0.5% sodium hypochlorite treatment produced lower flexural strength and elastic modulus than the other cleaners(P 0.05).Conclusion:Both Poli-dent and Steradent don't affect the physical and mechanical properties of the heat-cured acrylic resin.0.5% sodium hypochlorite solu-tion doesn't affect the surface roughness,but decreases the flexural strength and elastic modulus of the resin.
ABSTRACT
Face is the forefront of aesthetics. Surgical resection of the maxillae and facial structures for treatment of cancer, trauma, congenital deformities or infection causes maxillofacial defect that has serious impact on the individual’s esthetic and has great psychological trauma of social outcast. When the presented defect is extensive and supporting structures is lacking, the rehabilitation and restoring functions is a challenging task. Rehabilitation becomes even more difficult when the problems at defect site are associated with the complications. An attempt has been made to rehabilitate of a patient at terminal stage having extensive maxillofacial defect with inoperable carcinoma, infections, and restricted mouth opening.
ABSTRACT
Background and objectives : The fracture of acrylic maxillary complete dentures is a commonly seen clinical problem which usually occurs due to heavy occlusal forces or accidental damage.The objectives of the study were to measure the impact strength of maxillary complete dentures fabricated with high impact acrylic resin and to evaluate the effect of woven E-glass fiber and silane treated glass fiber reinforcement on the impact strength of the Maxillary complete dentures. Methods :One commercially available heat cured acrylic resin (Trevalon HI) was selected. Preimpregnated woven E-glass fibers (Stick Net) and Silane treated glass fibers were used to reinforce ten maxillary complete dentures each. Ten unreinforced complete dentures served as the control group. The impact strength in Joules of the dentures were measured with a falling-weight impact test. Results : The mean impact strength of the control dentures was 75.22+/ - 10.392 J at crack initiation, and 84.62+/- 11.495 J at complete fracture. The mean impact strength of dentures reinforced with preimpregnated woven E-glass fibers was 165.91+/- 12.929 J at crack initiation, and 187.06+/- 17.972 J at complete fracture. The mean impact strength of dentures reinforced with silane treated glass fibers was 112.30+/- 8.709 J at crack initiation, and at complete fracture was 126.43 +/- 8.709 J. Interpretation and Conclusion :The impact strength of maxillary complete dentures fabricated with high impact acrylic resin increased significantly after reinforcement with preimpregnated woven Eglass fibers and silane treated glass fibers. The best improvement, however , was obtained by preimpregnated woven Eglass fibers.