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Kaur H.,Kothiwal Dental College | Singh H.,Kothiwal Dental College | Vinod K.S.,Triveni Institute of Dental science | Singh B.,Vananchal Dental College | And 2 more authors.
Journal of Oral Biology and Craniofacial Research | Year: 2014

Background: Perpetual research in esthetic dentistry has stupendously contributed in improving the mechanical and esthetic properties of restorative materials. Recently introduced nanocomposite claim to possess higher optimized esthetic and mechanical properties superior to other esthetic restorative materials in clinical use. It has been highlighted in many studies that intraoral degradation of composites is a consequence of both mechanical factors and chemical degradation. Thus, this in-vitro study was conducted to determine the strength of commonly used esthetic restorative materials after conditioning them in dietary solvents, thereby, simulating the intraoral environment. Aim: Evaluation of shear punch strength of nanocomposite and compomer, post-conditioning in dietary solvents. Materials and methods: Two test groups mentioned above, each containing sixty preconditioned samples, divided into four subgroups of fifteen samples each and conditioned in different dietary solvents, were subjected to shear punch test in custom designed shear punch apparatus in Universal Testing Machine. Results: Among the dietary solvents, citric acid caused maximum decrease in the strength while conditioning in heptane showed increase in strength of the test restorative materials. Conclusion: Nanocomposite revealed to have higher strength, thereby indicating its better application universally. © 2014 Craniofacial Research Foundation. Source

Rohit S.,Rajarajeswari Dental College and Hospital | Praveen Reddy B.,Government Dental College | Sreedevi B.,Hitkarini Dental College and Hospital | Prakash S.,Triveni Institute of Dental science
Journal of Clinical and Diagnostic Research | Year: 2015

Pycnodysostosis is a rare craniofacial syndrome characterized by dwarfism, cranial anomalies, diffuse osteosclerosis where multiple fracture of long bones and osteomyelitis of jaw are frequent complications. This clinical entity was first described in 1962 by Maroteaux and Lamy. This article presents two clinical cases of pycnodysostosis with their clinical and radiological characteristics. © 2015, Journal of Clinical and Diagnostic Research. All right reserved. Source

Reddy J.C.,Partha Dental Hospital | Chintapatla S.B.,Aditya Dental College and Hospital | Srikakula N.K.,CKS Teja Institute of Dental science | Juturu R.K.R.,Lenora Institute of Dental science | And 4 more authors.
Journal of Clinical and Diagnostic Research | Year: 2016

Introduction: Retention and esthetics are believed to play a crucial role in deciding the success of removable partial dentures. Aim: To compare retention of acetal resin and cobalt–chromium clasps. Materials and Methods: A finite element model was designed with an edentulous space between mandibular right second premolar and second molar. Occlusal rests were placed on distal fossa of the second premolar and mesial fossa of second molar. An undercut depth of 0.01inch was created on the mesiobuccal surface of the premolar and distobuccal surface of second molar. Three dimensional finite element model of clasp assembly was designed and assigned with the properties of two different materials namely acetal resin and cobalt–chromium in successive steps. A horizontal bar was constructed between the occlusal rests of the prosthesis. Later, variable amount of dislodging force, in increasing order, was applied at the centre of the horizontal bar and the force at which the clasp arm gets dislodged was noted with respect to each of the material. The obtained values were noted and then subsequently analyzed. Results: The amount of force required to dislodge acetal resin and cobalt–chromium clasps was found to be 0.02N and 2N respectively. Conclusion: The results obtained suggested that acetal resin clasp exhibited less retentive force than cobalt–chromium clasps. © 2016, Journal of Clinical and Diagnostic Research. All rights reserved. Source

Sharma S.,Triveni Institute of Dental science | Vora S.,Private Practice | Pandey V.,Hospital and Research Center
Journal of Clinical and Diagnostic Research | Year: 2015

Background and Objectives: Excessive overbite is one of the most common problems that confront the orthodontist. Deep bite can be due to infraocclusion of posterior teeth, supraocclusion of anterior teeth or a combination of the two. Correction of same can be carried out by extrusion of molars, intrusion of incisors or by a combination of both respectively. Various intrusion arches are recommended for correcting deep bite by true intrusion of anterior teeth, Utility arches, Segmental arch, Connecticut Intrusion Arch (CIA) and Connecticut New Arch (CNA). The purpose of this study was to evaluate clinical efficacy of CIA and CNA intrusion arches. Materials and Methods: Tracings recorded from pre and post-treatment lateral cephalograms of 25 patients treated by CIA (Group I) and another 25 patients treated by CNA (Group II) intrusion arches in deep bite cases after four months of treatment were analysed and findings were recorded. Statistical Analysis: Paired t-test was used to compare pre and post-treatment changes within Groups I and II and unpaired t-test was used to compare treatment changes between Group I and Group II. A P-value of < 0.05 was set for statistical significance. Results: Findings of this study demonstrate that an average of 1mm of intrusion takes place with CIA intrusion arch and 1.3mm with CNA intrusion arch in a period of 4 months. Both intrusion arches do not affect the position of molar in vertical or anteroposterior plane. Interpretation & Conclusion: Both CIA and CNA intrusion arches are effective in bringing about intrusion of lower incisors. © 2015, Journal of Clinical and Diagnostic Research. All rights reserved. Source

Kharat S.S.,Triveni Institute of Dental science | Tatikonda A.,Triveni Institute of Dental science | Raina S.,Dr D Y Patil Dental College And Hospital | Gubrellay P.,Crown College | And 2 more authors.
Journal of Clinical and Diagnostic Research | Year: 2015

Background: The prime goal of a diligent prosthodontist is to obtain adequate marginal fit while restoring lost tooth structure. The marginal fit of the restoration, in turn depends upon the geometrical morphology of the tooth preparation. Objective: To determine the effect of varying degree of convergence angle on the marginal seating of the single crown, three-unit fixed partial denture and multiple-unit fixed partial denture with pier abutment. Materials and Methods: Three dies, of same convergence angle, were placed in an arch form on a base. In this way, four arch forms were prepared for four different convergence angles i.e. 00, 60, 120, and 200. Five castings each were made for single crown, 3-unit fixed partial denture and multiple-unit fixed partial denture (FPD) with pier abutment for each convergence angle. The castings were seated on their respective dies and vertical marginal discrepancy was measured at four points for each casting with the help of an optical microscope. Results: The results showed that 200 convergence angle showed better marginal seating of the single crown, 3-unit FPD as well as for the multiple unit FPD. Conclusion: There was a possibility that the retention and resistance may be compromised with 200 taper. Hence 120 taper is suggested for crowns and fixed partial denture retainers as the marginal discrepancy is reasonable and retention and resistance is optimum. There was a high statistical significant difference in the values obtained for the different convergence angles. © 2015, Journal of Clinical and Diagnostic Research. All rights reserved. Source

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