Statement Of Problem: Computer-aided design and computer-aided manufacturing (CAD-CAM) milled titanium bars have shown good clinically acceptable passive fit and definitive marginal fit; however, investigations into the passive fit and definitive marginal fit of prefabricated CAD-CAM milled titanium bars are lacking.
Purpose: The purpose of this in vitro study was to compare and evaluate the passive fit and definitive marginal fit of prefabricated and conventional CAD-CAM milled titanium bars.
Material And Methods: A total of 10 polyurethane radiopaque anatomic completely edentulous mandibular models had implants (Biohorizons) placed in the left and right canine and second premolar positions using a 3-dimensionally printed fully guided surgical guide. For the conventional bars, impressions were made, and casts were scanned and exported to a software program (exocad 3.0). For the prefabricated bars, the surgical plans were exported from the software program directly. The Sheffield test was used to evaluate the passive fit of the bars, and marginal fit was evaluated with a scanning electron microscope at ×50 magnification. The Shapiro-Wilk test was used to determine that the data were normally distributed; the data are presented using mean and standard deviation. Group comparisons were made with the independent t test (α=.05).
Results: The passive and marginal fit of the conventional bars was better than that of the prefabricated bars. The mean ±standard deviation values for passive fit were 75.2 ±13.7 μm for conventional bars and 94.7 ±16.0 μm for prefabricated bars (P<.001). A statistically significant difference (P<.001) was also found between the marginal fit of the conventional bars 18.7 ±6.1 μm and the prefabricated bars 56.3 ±13.0 μm.
Conclusions: Conventional CAD-CAM milled titanium bars had a better passive and marginal fit than prefabricated CAD-CAM milled titanium bars; however, both had clinically acceptable passive fit ranging from 75.2 to 94.7 μm and definitive marginal fit ranging from 18.7 to 56.3 μm.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.prosdent.2023.03.022 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Introduction Movement requires maneuvers that generate thrust to either make turns or move the body forward in physical space. The computational space for perpetually controlling the relative position of every point on the body surface can be vast. We hypothesize the evolution of efficient design for movement that minimizes active (neural) control by leveraging the passive (reactive) forces between the body and the surrounding medium at play.
View Article and Find Full Text PDFNeural dynamics of attentional resource allocation in early visual cortex: emotional scenes produce competitive interactions.
Cereb Cortex
December 2024
Wilhelm Wundt Institute for Psychology, University of Leipzig, Neumarkt 9-19, Leipzig 04109, Germany.
Salient emotional visual cues receive prioritized processing in human visual cortex. To what extent emotional facilitation relies on preattentional stimulus processing preceding semantic analysis remains controversial. Making use of steady-state visual evoke potentials frequency-tagged to meaningful complex emotional scenes and their scrambled versions, presented in a 4-Hz rapid serial visual presentation fashion, the current study tested temporal dynamics of semantic and emotional cue processing.
View Article and Find Full Text PDFEngagement With Daily Symptom Reporting, Passive Smartphone Sensing, and Wearable Device Data Collection During Chemotherapy: Longitudinal Observational Study.
JMIR Cancer
December 2024
University of Pittsburgh, Pittsburgh, PA, United States.
Background: Chemotherapy can cause symptoms that impair quality of life and functioning. Remote monitoring of daily symptoms and activity during outpatient treatment may enable earlier detection and management of emerging toxicities but requires patients, including older and acutely ill patients, to engage with technology to report symptoms through smartphones and to charge and wear mobile devices.
Objective: This study aimed to identify factors associated with participant engagement with collecting 3 data streams (ie, daily patient-reported symptom surveys, passive smartphone sensing, and a wearable Fitbit device [Google]) during chemotherapy.
Effect of shape and size of implant scan body on scanning accuracy: An in vitro study.
J Dent
January 2025
Faculty of Dentistry, The University of Hong Kong, Hong Kong special administrative region, PR China. Electronic address:
Objectives: Evaluating the effect of shape and size of implant scan body on the accuracy of optical 3D scanning.
Materials And Methods: Fifteen PEEK scan bodies were milled, including 1 spherical, 9 cylindrical, and 5 cuboidal. The 3D position and angulation of each scan body were measured using a CMM 3 times and a laboratory scanner 10 times.
[Adverse events from the Pfizer-BioNTech® COVID-19vaccine in children 5-17 years old].
Rev Alerg Mex
September 2024
Centro Médico Virtual de Alta Especialidad (CEMEVI), Puebla, México.
Objetives: To describe the events supposedly attributable to immunization with the Pfizer-BioNTech® COVID-19 vaccine in children aged 5 to 17 years in the state of Puebla, Mexico.
Methods: Observational, cross-sectional and descriptive study carried out based on the analysis of reports of events supposedly attributable to immunization in children aged 5 to 17 years, who received the vaccine with the BNT162b2 mRNA platform for COVID-19, since January. to December 2022.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!