The Journal of Indian Prosthodontic Society最新文献

Aim: The purpose of this in vitro study was the evaluation of the tensile bond strength of two different cements used for luting zirconia coping to one-piece zirconia implant.

Settings and design: The study was designed in an in vitro study setting.

Materials and methods: A one-piece zirconia implant was scanned on laboratory scanner, and thirty zirconia implants were milled by computer aided manufacturing (CAM). Subsequently, the abutment surface of each zirconia implants were scanned in laboratory scanner and coping with a hole was designed by computer-aided designing software, which was used for milling by computer-aided manufacturing (CAM). After various surface treatments of abutment and intaglio surface of coping, fifteen sets were cemented by glass ionomer cement (Group I) and the other fifteen sets by adhesive resin cement (Group II). All thirty samples after thermocycling were dried and pulled out in a universal testing machine, and tensile retention force is noted in pounds per square inch (psi).

Statistical analysis used: Values for tensile retention force were tabulated for both the groups. Mean and standard deviation are calculated. Independent t-value and P value were calculated.

Results: The least tensile retention force was reported in Group I (165.86 ± 25.74 psi). Maximum tensile retention force was received for Group II (396.81 ± 78.32 psi). Independent t-test was applied from which t-value calculated was 10.85 and P value obtained was 0.001, which means that there exists a very high difference in tensile bond strength of cement in Group I and Group II.

Conclusions: Better tensile retention forces were observed in samples cemented with adhesive resin cement when compared to samples cemented with glass ionomer cement.

Aim: Rehabilitation of edentulous jaws with implant-supported overdenture has achieved a comprehensive acclamation across the globe due to compromised retention and stability in conventional complete dentures. In dentistry, low-level laser therapy (LLLT) has become a viable treatment option for lowering inflammation, easing pain, and speeding up wound healing. This study aimed to evaluate the effect of LLLT on alleviation of pain in patients with two implant-supported mandibular overdentures.

Study setting and design: This study was carried out in the Department of Prosthodontics at Index Institute of Dental Sciences, Indore, Madhya Pradesh. Completely edentulous patients willing for implant-supported mandibular overdenture and who gave consent, were enrolled.

Materials and methods: A total of ten implants were placed in five patients with completely edentulous mandibular arch willing for implant-supported mandibular overdenture. Individuals from the outpatient division of Department of Prosthodontics, Crown & Bridge, Index Institute of Dental Sciences, Indore were chosen as patients. Bilateral implants were inserted into the mandible at locations B and D. On the experimental side, low-level laser therapy (wavelength 810 nm) was administered immediately following implant insertion and on the third day. Over the course of 72 hours, pain after surgery was assessed using visual analogue scale (VAS) values, beginning at baseline.

Statistical analysis used: The Mann-Whitney U test was used for statistical analysis of the intergroup pain alleviation scores.

Results: The results showed that on intergroup comparison, the experimental side exhibited significantly reduced VAS pain scores relative to the control side (P<0.05).

Conclusion: LLLT can be used as a promising adjuvant therapy to lower the degree and duration of pain after undergoing dental implant surgery.

Aims: The aim of the study is to analyse the awareness and knowledge about IOSs among the dental students of Tamil Nadu.

Settings and design: A cross sectional survey - questionnaire study.

Materials and methods: A descriptive, cross-sectional survey was carried out to assess the knowledge, awareness, and practice of IOSs among dental students through a questionnaire of five domains, with five questions in each domain. This is sent to various dental students of Tamil Nadu through mail and othersocial media platforms.

Statistical analysis used: It was performed using a statistical package for the social sciences' [SPSS] software version 22. Descriptive statistics were performed for demographic variables. Chi square test was performed for all the qualitative data.

Results: Most of the answers were statistically significant with P < 0.05 and few results were not significant indicating less knowledge and awareness about digital prosthodontics among the dental students.

Conclusions: Thus, the addition of digital dentistry in the curriculum of dental students and giving them more knowledge helps in the flourishment of the future prosthodontic field with much accuracy of treatment and with less patient discomfort replacing the conventional methods.

Objective: A comparative study undertaken to measure the the marginal bone loss (MBL), implant survival rate, and prosthetic and biological complications among short implants (8 mm or shorter) and conventional implants (longer than 8 mm) in the posterior atrophic maxilla.

Materials and methods: A search in three databases PubMed (Medline), Scopus, and Cochrane was conducted. The present systematic review was registered with identification number CRD42020212805 at the International Prospective Register of Systematic Reviews. Data extraction included the publication year, patients' number and number of implants, implant length and width, MBL, implant survival rate, and biological and mechanical complications. The Cochrane Risk of Bias 1.0 tool was used to assess the risk of bias. A meta-analysis was performed to evaluate the outcome variables. Comparisons for dichotomous variables, such as prosthetic and biological complications and implant survival rate, were done by applying the Mantel-Haenszel method. In contrast, a comparison was made by applying the inverse variance method for continuous variables like MBL.

Results: Initially, 618 reports were recognized from electronic database searches. Five randomized controlled trials (RCTs) were included in the meta-analyses regarding the MBL, implant survival rate, and prosthetic complications, while three were included for biological complications. In 5 years of follow-up, no evidence of difference could be found between conventional and short implants for survival rate (risk ratio [RR]: 3.54; 95% confidence interval [CI]: 0.99-12.67; P = 0.05; I2 = 0%). We do not find any evidence of difference for MBL between short implants and conventional implants (mean difference: -0.29; 95% CI: -0.49 to -0.08; P = 0.02; I2 = 65%). Furthermore, no evidence of a difference exists between short and conventional implants for prosthetic complications (RR: 1.56; 95% CI: 0.68-3.55; P = 0.29; I2 = 0%). The biological complications were seen less with short implants (RR: 0.47; 95% CI: 0.24-0.93; P = 0.03; I2 = 0%).

Conclusion: The results suggest no significant difference among conventional and short implants regarding survival rate in the posterior atrophic maxilla. The results of this systematic review and meta-analysis suggest that, for a 5-year period of follow-up, short implants are related to rarer biological complications and comparable MBL compared to conventional implants. Despite these promising findings, long-term studies with consistent study designs and clinical protocols are required to appraise the performance and durability of short implants.

Aim: This study aims to evaluate the changes in occlusal contacts resulting from variations in head postures (supine[S], semi-supine [SS], upright with head rest support [HR], and without head rest support [WHR]) after occlusal adjustment of conventional fixed dental prostheses using Tekscan III.

Settings and design: A cross-sectional study on 15 patients with missing single molars and undergone replacement with a fixed dental prosthesis.

Materials and methods: Fifteen patients with a three-unit tooth-supported fixed dental prosthesis replacing a missing single posterior tooth were included. Tekscan III was used to analyze occlusion time (OT), disclusion time (DT), initial tooth contact, and relative bite force in different head postures by adjusting the backrest position before and after equilibration. Occlusal adjustments were performed to achieve the balance between the right and left halves.

Statistical analysis used: The data were statistically analyzed using ANOVA and paired t-test.

Results: Posterior shift of initial tooth contact was observed from SS to supine and upright positions, whereas an anterior shift occurred from SS to WHR support posture. High-intensity forces were observed before the occlusal adjustment in various head positions, and these forces changed after adjustments in SS position. However, medium-intensity force occlusal prematurities persisted in other head postures even after corrections in SS position. There was a significant difference in OT but not in DT in all head postures after equilibration. When OT was compared from SS to remaining posture after equilibration, the major difference was found from SS to head rest (HR) and supine to HR posture which infers the need for selective grinding in these postures.

Conclusion: Considering the various changes while changing the head position from the SS position to the other functional position, it can be inferred that there is a need to consider recalibration of occlusal contacts in all the functional postures.

Aim: This study aims to evaluate the surface homogeneity of poly methyl methacrylate (PMMA) resin fabricated by two different methods of incorporating titanium dioxide nanoparticles (NPs).

Settings and design: In vitro study; qualitative analysis.

Materials and methods: PMMA resin was divided into two groups with 1% of titanium dioxide NPs were added to each group; Group A contained NPs incorporated in the polymer through magnetic stirring for 60 min and Group B contained NPs incorporated in the monomer through ultrasonic dispersion for 60 min. Ten acrylic block samples were fabricated by standard method for each group and then tested for surface homogeneity by scanning electron microscopy analysis for qualitative analysis.

Results: Group A showed NPs as defined pale white dots with a consistent distribution pattern and minimal air entrapment. Group B showed NPs agglomerated forming clusters of white dots with flaky sheet-like structures.

Conclusion: Magnetic stirring of NPs into polymer showed better surface homogeneity than the ultrasonic dispersion of NPs in monomer. The NP incorporation method plays a role in modifying the surface homogeneity of the acrylic.

Nasal obstruction due to deviated nasal septum (DNS) is commonly defined as patient discomfort manifested as a sensation of insufficient airflow through the nose. The definitive treatment for a DNS is septoplasty, this customized nasal device can be used as an adjunct to treatment. And can be used as a breather until The patient receives or underwent definitive treatment. This device contains a nasopharyngeal airway tube and a customized nasal dilator, the nasopharyngeal airway tube is made of soft and elastic medical plastics, with good biocompatibility, without skin damage and allergy, which will be inserted inside. which will be inserted inside the affected nostril and it fits accurately between the septum and the lateral endonasal tissue, the nasal dilator which is composed of heat-cure acrylic resin helps to keep the nasopharyngeal airway in position withoutdislodging. The device also has an elastic band on both sides which can be worn like a mask by the patient. The nasopharyngeal tube of this device has a stopper that prevents the nasopharyngeal tube to go inside the nostril accidentally and the said tube is sterilizable and easily replaceable (even by the patient).

Aim: The study's objective was to evaluate the stress distribution in tooth-implant, implant-implant, and tooth-tooth supported prostheses under parafunctional loading in axial and oblique directions employing a 3D finite element analysis in the mandibular posterior region which had D3 bone (porous cortical bone and fine trabecular bone).

Setting and design: In vitro study, Finite element analysis.

Meterials and methods: Cone-beam computed tomography data was used by Mimics software (Materialize Mimics 19) to create a three-dimensional finite element simulation of the jaw. Solid Works 2018 (Dassault Systems) was used to produce a geometric 3D model of the three systems. Each model consisted of a bone, an implant, and teeth (Model I tooth-tooth supported, Model II tooth-implant supported and Model III implant-implant supported). The three models' geometrical models were transferred to Ansys Workbench (19.2 software) for the analysis portion. A load that mimicked masticatory force was delivered in both axial and oblique directions.

Statistical analysis used: In the present study, statistical analysis was not required because 3D finite element analysis uses deterministic numerical methods to simulate physical behavior and stress distribution patterns.

Result: The results demonstrated that under the parafunctional combined loading process, the implant- implant supported prosthesis showed significantly higher stress concentrations in the bone. It was found that the cortical bone around the crestal region had the highest stresses.

Conclusion: Within the constraints of this investigation, we could draw the following conclusion: Of the three models, the tooth-tooth supported prosthesis exhibited the least amount of stress distribution, which was also least when functional loading was applied in the axial direction.

Aims: The study was aimed to evaluate the effect of prosthodontic rehabilitation on psychological status (PS) and quality of life (QoL) in maxillectomy patients of coronavirus disease 2019-associated mucormycosis (CAM).

Settings and design: The study was designed as a prospective and clinical study.

Materials and methods: Twenty-four CAM patients undergoing maxillectomy and subsequent prosthetic rehabilitation were included. The treatment involved surgical, intermediate, and definitive obturator delivery at various phases of healing. PS was assessed using the Hospital Anxiety and Depression Scale (HADS), QOL using the European Organization for Research and Treatment of Cancer QoL Questionnaire-Head and Neck Module (EORTC QLQ-HandN35), and the functioning of obturator was assessed utilising the Obturator Functioning Scale (OFS) at various time points: before maxillectomy (T1), 2 weeks after maxillectomy (T2), 2 weeks upon usage of intermediate obturator (T3), just before delivery of definitive obturator (T4), and 12 weeks after the usage of definitive obturator (T5).

Statistical analysis used: Data were analyzed using a social science statistical analysis program (Stata 14.0; StataCorp LLC, Texas, USA). The significance level was chosen <0.05. Shapiro-Wilk test was used to assess the normality of quantitative data. Student's t-test was employed (α =0.05) to evaluate if the patient's PS, QOL, and obturator function had changed over time. The Spearman correlation coefficient (α =0.05) was utilized to evaluate the correlation coefficient between PS, QOL, and obturator function seen at T3 and T5.

Results: Out of 24 enrolled patients, nine were dropped out. HADS-anxiety score was the highest at T1 (18.6 ± 1.2) and HADS-depression score was the highest at T2 (18.8 ± 1.6). HADS scores decreased significantly (P = 0.001) after prosthetic rehabilitation. EORTC QLQ-HandN35 score was the highest at T2 (105.8 ± 29.5), with statistical significance (P = 0.001) after rehabilitation. OFS was the highest at T3 (51.9 ± 3.9) and lowest at T5 (25.4 ± 2.8).

Conclusion: CAM and maxillectomy deliberately affects the PS and QOL. Prosthetic rehabilitation, psychological motivation, and education create greater improvement in PS and QOL. The progress in parameters showed an upward trend with good obturator quality over a period of time.