In vitro Evaluation of the Accuracy of Seating Cast Metal Fixed Partial Denture on the Abutment Teeth with Varying Degree of Convergence Angle

Kharat, Swati; Tatikonda, Aravind; Raina, Seema; Gubrellay, Priyanka; Gupta, Naveen Kumar; Asopa, Swati Joshi

doi:10.7860/jcdr/2015/13155.6206

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…On the other hand, the continuous developing of strong luting cements may be a reason behind the absence of worriedness toward excessive TOC by GP. Should not be overlooked, TOC more than 20 degrees sharply increases the stress on the cement (18), and negatively affects the retention and resistance (43). In Tiu et al (44) study, when mean BL and MD TOC of the GP were calculated, they were 42.2 degrees and 34.1 degrees, respectively.…”

Section: Discussionmentioning

confidence: 99%

Convergence Angles of Clinical Tooth Preparations for Metal Ceramic Restorations Among Dental Students and General Practitioners

Hinnara¹,

Barngkgei

Nassar³

2017

Avicenna J Dent Res

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Background: Numerous studies showed that the convergence angle (CA) of prepared teeth for fixed prosthodontics in the clinical practice is greater than the recommended values. Objectives: This cross-sectional study aimed to compare the total occlusal convergence (TOC) angles of metal ceramic fixed prosthodontics among dental students [final-year undergraduate (UG) and Master Prosthodontics (MS) students] and general practitioners (GP) in their private clinics with the recommended value (≤ 12 degrees). Methods: The buccolingual (BL) and mesiodistal (MD) TOC of 114, 90, and 111 stone dies referred to UG, MS, and GP, respectively, were measured. These dies included incisors, premolars, and molars. One sample Wilcoxon signed rank test, Mann-Whitney U test, Kruskal-Wallis, and Fisher exact test were used for statistical analysis. Results: Mean values of TOC for UG were 27.8 degrees BL and 20.9 degrees MD, whereas they were 30.6 degrees BL and 18.2 degrees MD for MS. GP had TOC of 35.5 degrees BL and 24 degrees MD. GP had significantly higher TOC values than the other groups (0.001

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Section: Discussionmentioning

confidence: 99%

Convergence Angles of Clinical Tooth Preparations for Metal Ceramic Restorations Among Dental Students and General Practitioners

Hinnara¹,

Barngkgei

Nassar³

2017

Avicenna J Dent Res

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“…Studies have shown that 30 0 and 45 0 build angle orientations provide acceptable dimensional accuracy and surface finish [61,62], [60,65]. Build orientation angles in this in vitro study were chosen according to the literature reviews and 3d-printer manufacturers' recommendations [58,66,67]. Layer thickness represents the height of each layer of the 3D-printed material regardless of the technology utilized.…”

Section: Discussionmentioning

confidence: 99%

The Accuracy of 3d-printed Fixed Dental Restorations

Alammar,

Att,

Beuer

2024

Preprint

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Objective: The aim of this in vitro study was to evaluate the accuracy of resin-based fixed dental restorations, namely veneers, single crowns, and four-unit fixed partial dental prosthesis (FPDs) using two different 3D printers and polymer-based materials. Materials and Methods: A standard maxillary polyurethane jaw model containing prepared teeth was scanned using an intraoral scanner. The generated STL data were used to design the restorations virtually using CAD software. Two 3D printers were utilized for the provisional digital light processing and stereolithography for the castable resin patterns. Each printer produced 10 specimens of each type of restoration, for a total of 80 restorations. The 3d-printed restorations were then 3D scanned using the same intraoral scanner and evaluated for external and internal dimensional accuracy in terms of trueness and precision. A one-way ANOVA and Two-sample T-Test were implemented to compute the precision (variability between groups) and trueness (with the designed CAD model). A level of statistical significance of p-Value

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“…Focusing on abutment survival alone, 10 years' survival rate was estimated to be 96%. 14,15 In a study by Ericson conducted over a period of three years, 3% of the studied population showed loss of abutment while a systematic review by Pjetursson et al shows loss of abutment in 3.3% of the population as a cause of FPD failure. 16,17 Pre-treatment condition of the teeth to be employed as abutment for fixed prostheses is of crucial significance to the long term prognosis, very limited amount of literature focuses on the pre-treatment condition of natural teeth and their suitability to serve as abutment for fixed prostheses.…”

Section: Discussionmentioning

confidence: 99%

Common conditions of abutment teeth and their severity in subjects requesting fixed dental prostheses at Watim Dental Hospital, Rawalpindi.

Khalil

Afreen

et al. 2021

TPMJ

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Objective: The objective of this study was to examine the abutments in subjects requesting for fixed dental prosthesis (FDP) and to determine the frequency of compromised coronal conditions and their severity levels. Study Design: Descriptive, Cross-sectional Study. Setting: Department of Prosthodontics at Watim Dental Hospital, Rawalpindi. Period: August 2019 to March 2020. Material & Methods: Conducted on 163 subjects. Abutments were evaluated in terms of clinical crown length, crown inclination, caries and/or fracture, type and quality of restoration. Abutments were categorized on the basis of complexity of the procedure required to make the abutment usable for fixed dental prosthesis. Arch-wise distribution of the abutment with compromised conditions and their proportion was also calculated. Results: The mean age of the participants was 39.42 + 11.56 years with male to female ratio of with 2.2:1. Maximum number of the patients had edentulous spaces located in the mandibular posterior region. Tooth no. 46 displayed the highest frequency of use as abutment while tooth no. 18, 28,31,32,42 displayed the least frequency of use as FDP abutment. About half of the abutments (47%) had compromised restoration quality. On the basis of the degree of compromise, 41.1% of the abutments were usable without further treatment or required a simple corrective procedure, 45.4% required a relatively complex procedure to make them useable while 11% had sufficient compromise to preclude their use for FPD support. Only 2.5% of abutments were classified as adequate. Conclusion: About half of the studied abutments in subjects reporting for replacement of missing teeth with FDP were found to be compromised and a substantial proportion required complex restorative treatment/re-treatment prior to be used as FDP abutments.

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In vitro Evaluation of the Accuracy of Seating Cast Metal Fixed Partial Denture on the Abutment Teeth with Varying Degree of Convergence Angle

Cited by 5 publications

References 23 publications

Convergence Angles of Clinical Tooth Preparations for Metal Ceramic Restorations Among Dental Students and General Practitioners

Convergence Angles of Clinical Tooth Preparations for Metal Ceramic Restorations Among Dental Students and General Practitioners

The Accuracy of 3d-printed Fixed Dental Restorations

Common conditions of abutment teeth and their severity in subjects requesting fixed dental prostheses at Watim Dental Hospital, Rawalpindi.

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