Aim: The aim of this study was to assess the impact of cyclic loading on screws attaching four different abutments to internally connected implants.
Materials and methods: Four groups (seven implants each) of dissimilar abutments: Straumann solid abutment (group I), southern implants solid abutment (group II), implant direct straight abutment (group III), and Blue Sky Bio regular platform abutment (group IV). Abutments were connected to Straumann tissue-level implants. Each implant was rigidly secured in a stainless steel cylindrical jig. A torque controller was used to tighten the abutments at 35 Ncm. A 150 N cyclic load for 1 million cycles was applied to the implant at a 30° angle to the long axis to the implants. Periotest values (PTVs) were measured before and after cyclic loading and a digital torque gauge was used to detect the removal torque values (RTVs) of abutments. The data were analyzed statistically using SPSS statistical software. Kruskal–Wallis tests and one-way analysis of variance (ANOVA) were used to compare RTVs and PTVs after application of equal loads for each group. The Spearman correlation coefficient was applied to compare RTVs and PTVs after loading.
Results: The Straumann solid abutment and the southern implants abutment showed no mechanical failures. Screws fracture was noted in nearly 85% of implant direct abutment, and 55% of the Blue Sky Bio abutments. The final mean PTV of the Blue Sky Bio abutments, the southern implants, and implant direct straight abutment was considerably higher than the final mean PTVs of Straumann solid abutment. The initial mean PTV (–4.36 ± 0.47) was lower than the final mean PTV (4.85 ± 5.58). The Straumann solid abutment RTVs values were considerably higher than that of the other abutments.
Conclusion: Abutments from the different manufacturers have different physical and chemical characteristics so there will be a potential risk of mechanical failure when the interchangeable abutments are used.
Clinical significance: The use of an abutment manufactured by the same implant company is highly recommended for the avoidance of loosening of the abutment screws.
How to cite this article:
Sadasiva K, Rayar S, Senthilkumar K, Unnikrishnan M, Jayasimharaj U. Analyzing the Reasons for Patients Opting-out from Root Canal Treatment and Preferring Extraction in South Indian Population—Prospective Study. Int J Prosthodont Restor Dent 2018; 8 (4):108-113.
Aim: To evaluate the reasons behind patients opting out from root canal treatment (RCT) and undergoing extraction in south Indian population.
Materials and methods: Data of 561 patients reported to the department of conservative dentistry and endodontics from the period 1st January 2013 to 31st December 2017 for the treatment of irreversible pulpitis and who eventually decided for extraction were collected. The questionnaires were sent to the patient and collected. The reasons documented were entered into Statistical Package for the Social Sciences (SPSS) statistical software for statistical analysis. The results subjected to frequency distribution tests.
Results: The study reveals the primary reason for the patient not undergoing RCT were misbelief in the success of RCT 14.97%, followed by cost factor 13.90% and for immediate pain relief following extraction 13.19%.
Conclusion: The patient\'s misbelief associated with the failure of RCT was the major reason for the patients to opt out of RCT and preferring extraction.
Clinical significance: The psychology of the patients in regard towards the root canal treatment can be clearly understood by this study. The article gives an insight into the acceptance and rejection of RCT by patients and therefore helping dentists/specialists in formulating better treatment plans according to the patient needs.
How to cite this article:
Elkholy S. Comparison of Water Conditioning Effects on Hardness and Dimensional Stability of Methyl Methacrylate and Polyamide Denture Base Materials. Int J Prosthodont Restor Dent 2018; 8 (4):114-119.
Aim: To evaluate the influence of water conditioning on the hardness and dimensional stability of polyamide denture material.
Materials and methods: The samples were conditioned in a water bath according to values of temperature (4° C and 43° C) and time (700 hours). To evaluate the hardness test, samples were fabricated from polyamide and heat cured acrylic resin materials and was divided into control, cold conditioning and hot conditioning groups and hardness were measured for all groups. For dimensional stability test, forty denture bases were divided into cold conditioning and hot conditioning groups. The gaps between the denture base and the cast were measured.
Results: The hardness of polyamide denture material was significantly decreased after hot water conditioning. Heat cured acrylic resin showed a significant increase in dimensional changes regarding cold water conditioning test.
Conclusion: Water conditioning at 43° C could decrease hardness and increase the flexibility of polyamide denture material. Water conditioning at 4° C could increase in dimensional instability of heat cure poly (methyl methacryolate) (PMMA) denture material.
Clinical significance: Use of dimensionally stable denture materials under the hot and cold condition are very important to retain the denture.
How to cite this article:
Agarwal M, Singh G, Qureshi R, Singh SK, Mishra A, Khurana N. Comparative Evaluation of Mechanical Properties of Cention N with Conventionally used Restorative Materials—An In Vitro Study. Int J Prosthodont Restor Dent 2018; 8 (4):120-124.
Objective: This study compared the compressive strength and flexural strength of Centurion N with other conventionally used restorative materials.
Materials and methods: Cention N, Amalgam, Glass Ionomer Cement and Hybrid composite resin was used for sample fabrication. A total of 80 specimens were prepared. Forty samples (n = 10 each) were prepared for compressive strength and other 40 samples (n = 10 each) were prepared for flexural strength using aluminum split molds. The samples were tested using a universal Instron testing machine (UTM). Data were statistically analyzed using the Games–Howell post hoc test to determine whether statistically significant differences (p < 0.05) existed among the various restorative materials.
Results: Compressive strength and flexural strength of composites was significantly higher than cention N, GIC, and amalgam. Compressive strength of cention N was significantly higher than GIC. Flexural strength of cention N was found to be significantly higher than GIC and Amalgam.
Conclusion: Within the limitations of this study, it can be concluded that composite had the highest compressive strength and flexural strength of the four materials tested. However, cention N can be used in various restorative procedures in daily dental practice as a basic filling material along with tooth matching ability, it has good comparable mechanical properties and unlike composite, it\'s economical to patients.
Pramod K Chahar,
E Mahesh Gowda,
Aim: To fabricate a silicone auricular prosthesis for unilateral auricular defect exactly simulating the healthy contralateral ear.
Background: Congenital or acquired loss of any facial structure has a very high negative impact on an individual\'s life. The prosthetic rehabilitation of a patient with unilateral auricular defect is a challenging task to replicate the complex anatomy of the auricle simulating contralateral ear.
Case description: This case report describes an innovative, accurate and simple technique which has not been mentioned in literature till date for fabrication of wax pattern of the auricular prosthesis without the use of any expensive or sophisticated equipment
Conclusion: This case report describes a technique that can be used in routine clinical practice to replicate the anatomy of auricle without using any expensive equipment.