Browsing by Author "Roopal Srivastava"

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A comparative evaluation of masticatory load distribution in different types of prosthesis with varying number of implants: A FEM analysis
(Elsevier B.V., 2024) Roopal Srivastava; Rajesh Bansal; Pavan Kumar Dubey; Deepak Singh
Aim: To identify the optimal number and position of implants to reduce stress concentration on the implant, denture, and attachment system for sustaining an overdenture prosthesis. Materials and methods: By incorporating one to eight indigenous implants with bar-type attachments, eight 3D finite element models of mandibular overdentures were created. All models received a 200 N vertical load, and the biomechanical characteristics of peri-implant bone were assessed. Result: The study observed that with a vertical load of 200 N, the maximum equivalent stress around peri-implant tissue in all models was within the physiological tolerance threshold of bone. The von Mises stress values ranged from 116.18 MPa to 536.7 MPa. Conclusion: The three-implant-supported overdenture model revealed superior peri-implant stress, stability, cost-effectiveness, and hygiene maintenance outcomes. Placing a third implant in the mid-symphysis region may offer a practical solution to reduce rotations in two-implant-supported overdentures. © 2024
Assessment of gingival biotype in different facial patterns: A cross‑sectional study
(Wolters Kluwer Medknow Publications, 2023) Vipul Kumar Sharma; Deepak Singh; Roopal Srivastava; T.P. Chaturvedi; Mahesh Khairnar; Akhilesh Kumar Singh
Objective: The aim of the present study is to evaluate the relationship of gingival biotype in different malocclusions. Methods: A total of 157 periodontally healthy subjects (88 males and 69 females) were enrolled in this cross‑sectional study. The study participants were divided into three groups of skeletal class I, class II, and class III. The probe transparency method was used to determine the quality and gingival tissue into thick and thin biotype. Results: There was significant difference in gingival biotype among different skeletal malocclusion with high prevalence of thin gingival biotype in class I subjects and more prevalence of thick biotype in class II and class III individuals (P‑value: 0.022). Pairwise comparison of gingival biotype in class I versus class II showed significant difference (P‑value: 0.032); however in class I versus class III and class II versus class III, the test result was nonsignificant. The overall frequency of thin gingival biotype was significantly less in female subjects with respect to males (P‑value: 0.025). Conclusion: A significant relationship is present between skeletal malocclusion and quality of gingival biotype. The prevalence of thick gingival biotype is found more in females as compared to male individuals. The thin gingival biotype is more commonly seen in skeletal class I than class II and class III. © 2023 National Journal of Maxillofacial Surgery.
Fabrication of orbital prosthesis by two different methods in patients with post-COVID-19 rhino-orbital maxillary mucormycosis: A case series
(Wolters Kluwer Medknow Publications, 2024) Bappaditya Bhattacharjee; Roopal Srivastava; Rajesh Bansal; Naresh K. Sharma
ABSTRACT: Neoplasms, congenital disorders, fungal infections, and traumatic injuries are the predominant causes of orbital defects. Various retentive mechanisms such as application of adhesive, utilization of mechanical undercuts, and implant-supported attachments are generally used in the maxillofacial prosthesis. In the orbital region, the result of magnet-retained attachments is favorable compared with other mechanisms. Different advantages of the magnet-retained prosthesis are less manual dexterity needed during insertion or removal and better maintenance of hygiene. The skin-implant interface and thick tissues in the maxillofacial region are the critically important points that should be given importance during the planning and placement of implants. Ideally, implant sites for orbital prosthesis are the lateral, infra-, and supraorbital rims of the orbital region. The following case series describes two different methods to rehabilitate patients with an exenterated eye due to mucormycosis by individually designed implant with magnetic attachment and mechanical undercut-retained orbital prosthesis. © 2024 Wolters Kluwer Medknow Publications. All rights reserved.
White spot lesions in clear aligner therapy as compared with multi-bracket system: A Systematic Review
(IP Innovative Publication Pvt. Ltd., 2023) Deepak Singh; Vipul K. Sharma; Roopal Srivastava; Pooja Priyadarshani; T.P. Chaturvedi
Aim and O bjective: To evaluate incidence of white spot lesions in clear aligner treatment compared with fixed appliance therapy. Materials and Methods: Electronic databases (PubMed, Cochrane Collaboration Oral Health group database of clinical trials, Web of Science, Science Direct, Scopus) and manual search of gray literature were conducted up to September 2021. Both randomized and non-randomized controlled studies were considered for review purposes. Study selection, data extraction, quality assessment (RoB 2.0 and ROBINS-I) was performed according to the Cochrane Handbook for Systematic Reviews of Intervention. Due to the presence of high heterogeneity only qualitative analysis has been done. Results: Out of 479 retrieved literature, 3 studies fulfilled the eligibility criteria and were included in the analysis. Studies were evaluated at low to high risk of bias. On qualitative analysis, a total of 160 new white spot lesions were developed in the clear aligner group and 362 new lesions were found in the fixed orthodontic group (P <0.001). In addition, the surface area of white spot lesion in the clear aligner group was more than the fixed appliance group but the deepest lesion was still found in the fixed appliance group. Conclusion: Incidence and severity of white spot lesion was found more in the fixed appliance group as compared to the clear aligner group. However, more low risk of bias studies with proper methodological quality is required to reinforce the conclusive evidence. © 2023 Author(s).