Evaluation of Wettability of Three Saliva Substitutes on Heat-polymerized Acrylic Resin-An In vitro Study.

AIM: The aim of the present study was to evaluate the wettability of three saliva substitutes on heat-polymerized acrylic resin. MATERIALS AND METHODS: Heat-cured acrylic resins 150 were made and divided into three groups containing 50 samples each, i.e., group 1 Aqwet, group 2 Biotene, and group 3 Mouthkote. The prepared wax pattern was cut using 30 × 30-mm two square glass plates along the sides using a sharp carver. The uniformity of the wax samples was checked using the wax gauge. The wax samples were invested using dental plaster in varsity flasks. The samples were prepared using conventional heat-cure denture base acrylic resin. A goniometer was used to calculate receding and advancing contact angles for dynamic contact angle analysis. RESULTS: The least mean value of advancing and receding contact angles was seen in group 1 Aqwet (68.12 ± 1.30 and 58.56 ± 0.10) followed by group 2 Biotene (81.64 ± 0.88 and 74.89 ± 0.45), and group 3 Mouthkote (85.76 ± 1.02 and 80.63 ± 0.66). A significant difference was found between the groups statistically with a p value of 0.001. A significant difference was found on multiple comparisons between group 1 vs group 3 and group 1 vs group 2 with different receding and advancing contact angles of saliva substitutes analyzed with Turkey's post hoc test. CONCLUSION: The lowest advancing and receding contact angle values were significantly seen in the Aqwet saliva substitute followed by Biotene and Mouthkote on heat-polymerized acrylic resin. CLINICAL SIGNIFICANCE: The clinical significance of the saliva substitute's good wetting property on acrylic denture base. The quality of life of the patients with xerostomia can be improved using a suitable saliva substitute.

Comparison of Different Post Systems for Fracture Resistance: An in vitro Study.

INTRODUCTION: Endodontic restoration becomes a challenging task for the clinician because of severe loss of coronal tooth structure owing to trauma, caries, restorative, and endodontic procedures. The restoration of these teeth requires the use of a post and core as individual units or as abutment supports for fixed or removable restorations in a predictable long-term manner. AIM: To compare and assess the compressive bond strength of glass, quartz, and carbon fiber posts restored with porcelain-fused-to-metal (PFM) crown. MATERIALS AND METHODS: A total of 45 upper central incisor teeth having straight root canals, similar anatomically root segments, and fully developed apices were selected. Teeth were divided into three groups of 15 teeth after endodontic treatment. Group I: Teeth inserted with the prefabricated glass fiber post. Group II: Teeth inserted with the quartz fiber post. Group III: Teeth inserted with carbon fiber post. The posts were placed and core was fabricated using composite restoration followed by PFM crown cementation using adhesive resin. Compressive load required to fracture the tooth was measured using a universal loading machine. The difference between the variables was assessed by one-way analysis of variance, followed by Tukey's post hoc test. RESULTS: The compressive strength exhibited by carbon fiber posts was highest with a mean of 668.33 ± 26.397, followed by quartz fiber post (635.80 ± 30.390). Least compressive strength was exhibited by glass fiber post (567.53 ± 26.632). An analysis of variance shows statistically highly significant difference (p < 0.005) among the posts used. CONCLUSION: This study concluded that the carbon fiber posts had higher compressive strength than other quartz, glass fiber posts. CLINICAL SIGNIFICANCE: Endodontic treatment results in loss of a significant part of the tooth structure. Posts restore these teeth and provide retention.

Partial Edentulism and its Association with Socio-Demographic Variables among Subjects Attending Dental Teaching Institutions, India.

BACKGROUND: Despite advances in preventive dentistry, edentulism is a major public health issues worldwide. Edentulism is an enervating and unrepairable condition and is described as the "final marker of disease burden for oral health." The objectives of the present study are to determine the relationship between socio-demographic variables and partial edentulism, and to evaluate the prevalence of various classes of partial edentulism by using Kennedy's classification. MATERIALS AND METHODS: Cross-sectional, descriptive study was conducted in an institution, on randomly selected individuals. The study group included adult patients who attended the outpatient Department of Prosthodontics during February-April 2015 formed the study participants. Data were collected by using a pre-formed pro-forma and Chi-square test was used to explore the relationship between two variables. RESULTS: A population comprised of 384 individuals between the age group of 18 and 35 years. Of these, 204 (53.12%) were males and 180 (46.88%) were females. Two hundred and eighty eight individuals were partially edentulous showing a prevalence rate of 75%. 51.04% of the study subjects were lost their teeth because of periodontol disease. 73.4% belonged to the upper middle class and 75.4% were in lower middle class in partially edentulous subjects. 45.8% had a fair oral hygiene status. Kennedy's class III was the most common type of partial edentulism in upper jaw and lower. CONCLUSION: The present study concluded that prevalence of partial edentulism among the study population was high. They need community-based oral health programs to increase the awareness and reduce the risk of tooth loss.