Comparative study of vertical fit on implant abutments with crowns.

| Posted in: Science

Journal name: World Journal of Pharmaceutical Research
Original article title: Comparative study of vertical marginal fit on implant abutment using metal ceramic crowns, full contour zirconia crowns (cad/cam) and veneered zirconia crowns (cad/cam) (an in vitro study)
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Original source:

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Author:

Inas K. Mohammed and Dr. Sabiha Mahdi Kanaan


World Journal of Pharmaceutical Research:

(An ISO 9001:2015 Certified International Journal)

Full text available for: Comparative study of vertical marginal fit on implant abutment using metal ceramic crowns, full contour zirconia crowns (cad/cam) and veneered zirconia crowns (cad/cam) (an in vitro study)

Source type: An International Peer Reviewed Journal for Pharmaceutical and Medical and Scientific Research

Doi: 10.20959/wjpr201712-9451

Copyright (license): WJPR: All rights reserved


Download the PDF file of the original publication


Summary of article contents:

Introduction

The study conducted by Inas K. Mohammed and Dr. Sabiha M. Kanaan focuses on the vertical marginal fit of crowns used in dental implants, specifically comparing metal-ceramic crowns, full-contour zirconia crowns, and veneered zirconia crowns. Proper marginal fitness is crucial for the longevity and success of implant-retained restorations. Discrepancies in fit can lead to various complications such as microbial colonization and peri-implant inflammation, potentially compromising the implant's success.

Marginal Fit and Its Clinical Relevance

Marginal fit refers to the vertical distance between the restoration's edge and the finishing line of the implant abutment. The study emphasizes that an acceptable marginal gap should ideally be under 120 micrometers to minimize the risk of complications associated with micro-leakage. The results indicated that among the three types of crowns evaluated, the full-contour zirconia crowns exhibited the least marginal gaps, making them clinically preferable.

Impact of CAD/CAM Technology

The research highlights the advantages of using CAD/CAM technology in creating dental crowns. The full-contour zirconia crowns fabricated with this technique demonstrated significant precision and superior marginal fit compared to metal-ceramic crowns made using traditional lost wax methods. The study contends that the CAD/CAM method effectively reduces fabrication errors that can occur during conventional processes such as wax modeling and casting, resulting in a better adaptation of the crowns to the implant abutments.

Comparison of Crown Materials

The study further explores the differences in marginal fit among the three crown materials. The findings revealed that metal-ceramic crowns had the highest marginal gap, attributed to the numerous manual processes involved in their creation, which can introduce inaccuracies. Conversely, full-contour zirconia crowns not only showed lower marginal gaps but also eliminated the need for porcelain veneering, thus avoiding complications associated with thermal contraction and material distortion during firing cycles.

Conclusion

In summary, the research concludes that full-contour zirconia crowns manufactured using the CAD/CAM system provide superior marginal fit compared to both metal-ceramic and veneered zirconia crowns. By maintaining a marginal gap within clinically acceptable limits, these crowns can enhance the resilience and success rate of dental implants. The study underlines the importance of material selection and fabrication techniques in achieving optimal outcomes in dental implantology.

FAQ section (important questions/answers):

What is the primary objective of the comparative study?

The study aims to evaluate and compare the vertical marginal fit among three types of crowns: metal-ceramic, full-contour zirconia, and veneered zirconia crowns used in dental implants.

How was the marginal gap measured in the study?

Vertical marginal gaps were measured at four points on each tooth surface using a digital microscope at a magnification of 230X, resulting in a total of 16 measurements per crown.

Which crown type showed the best marginal fit?

The study revealed that full contour zirconia crowns showed the least marginal gap, demonstrating better vertical marginal fit compared to metal-ceramic crowns and veneered zirconia crowns.

What were the marginal gap results for the materials tested?

The mean marginal gaps were 39.239 µm for full contour zirconia, 68.433 µm for veneered zirconia, and 92.513 µm for metal-ceramic crowns, indicating significant differences.

Why is marginal fit important in dental implants?

A proper marginal fit is crucial for preventing plaque accumulation, cement dissolution, and potential microbial colonization, which can lead to peri-implant inflammation and restoration failure.

What fabrication techniques were used for each crown type?

Metal-ceramic crowns were made using lost wax technique, while full-contour and veneered zirconia crowns were constructed using CORETIC 250i CAD-CAM system for enhanced precision.

Glossary definitions and references:

Scientific and Ayurvedic Glossary list for “Comparative study of vertical fit on implant abutments with crowns.”. This list explains important keywords that occur in this article and links it to the glossary for a better understanding of that concept in the context of Ayurveda and other topics.

1) Study (Studying):
The term 'study' refers to the systematic investigation conducted to explore the vertical marginal fit of different crown materials in dental implant restorations. It encompasses the formulation of hypotheses, methodology, data collection, and analysis to draw reliable conclusions about the effectiveness of materials used in dentistry, specifically relating to marginal gaps.

2) Surface:
In the context of this research, 'surface' pertains to the area of the crown that interfaces with the dental implant abutment. The vertical relationship and precise fit between these surfaces are critical for preventing micro-leakage, ensuring the long-term success of implant restorations, and maintaining oral health.

3) Firing:
The term 'firing' refers to the heat treatment process involved in the porcelain veneer application to metal or zirconia frameworks. This process influences the bonding strength between materials, affecting overall fit and durability. Firing cycles can induce thermal expansion or contraction, impacting marginal gaps in the final restoration.

4) Line:
The 'line' in this research pertains to the finishing line of the implant abutment, which is crucial for defining the margin where the crown meets the abutment. Accurate delineation of this line is vital for achieving proper seal and fit, ultimately influencing the longevity and functionality of the restoration.

5) Measurement:
Measurement is an integral aspect of the study, involving the quantification of vertical marginal gaps between the crown and abutment. Precise measurements using digital microscopy allow researchers to assess the fit of various crown types, facilitating comparisons and ultimately leading to conclusions about material efficacy in dental applications.

6) Table:
In the context of the study, 'table' refers to the organized presentation of data that summarizes the findings, such as mean marginal gaps across different groups. Tables facilitate easy comparison and analysis of results, helping researchers and readers quickly grasp key statistics and trends within the study.

7) Reason:
The term 'reason' encompasses the underlying justifications for observed outcomes in the study. Analyzing reasons for differences in marginal fit among crown types aids in understanding the materials' behaviors and the processes that lead to successful or compromised implant restorations, highlighting factors affecting clinical effectiveness.

8) Inflammation:
Inflammation is a critical medical concern relevant to dental implants, where inadequate marginal fit can lead to microbial colonization, causing periodontal issues. Understanding the relationship between marginal gaps and inflammation assists practitioners in diagnosing potential complications, thereby guiding decisions regarding material choices and restoration techniques.

9) Observation:
Observation refers to the systematic documentation and analysis of the fit and performance of the ceramic crowns in the study. Detailed observations provide insights into the behaviors of different materials under specific conditions, fostering a deeper understanding of dental implant success and areas needing improvement.

10) Science (Scientific):
The term 'science' denotes the systematic approach employed in the study to investigate dental materials and their interactions within clinical settings. Underpinned by scientific methods, the findings contribute to the broader knowledge base of restorative dentistry and enhance the understanding of materials' influences on patient outcomes.

11) Powder:
In this research, 'powder' refers to the porcelain or ceramic materials used in the creation of crowns, which are mixed with liquid to form a workable material. The quality and properties of the powders directly influence the outcomes of the restoration processes and the final properties of the crowns.

12) Wall:
The 'wall' relates to the sides or surfaces of the dental implant abutment and the crowns used in the study. The interaction between these walls is vital to achieving an accurate fit, as poor alignment can lead to significant gaps that threaten the success of the dental restoration.

13) Pur:
The term 'poor' is used in the context of inadequate marginal fit, which can negatively impact the longevity and success of dental restorations. Recognizing poor fit allows practitioners to address potential issues before they lead to complications, highlighting the importance of precise construction techniques.

14) Transformation (Transform, Transforming):
Transformation refers to the process internal to zirconia materials where specific phases alter under heat treatment, enhancing strength and durability. Understanding these transformations during the firing cycle helps optimize fabrication processes, leading to better fitting and more reliable restorations in dental practice.

15) Transmission:
The term 'transmission' pertains to the transfer of forces and stress from the crown to the dental implant. Understanding how forces are transmitted through various materials helps in predicting their performance and durability in real-life clinical situations, prioritizing patient outcomes in restorative dentistry.

16) Discussion:
Discussion within the study context involves the critical analysis of findings, comparing them with existing literature. This allows researchers to contextualize their discoveries and suggest practical applications, furthering the understanding of materials' behaviors and informing clinical decisions in dental restoration practices.

17) Quality:
In this research, 'quality' refers to the overall effectiveness of the dental materials based on their performance in clinical settings. Evaluating quality helps determine the best practices in crown fabrication, ensuring optimal results in terms of fit, aesthetics, and longevity of dental restorations.

18) Weaver:
The term 'Weaver' may refer to a researcher or author involved in prior studies relevant to dental materials. Referencing previous work enriches the discussion, allowing for a deeper exploration of established findings that support the study's methodology and conclusions in restorative dentistry.

19) Field:
The term 'field' indicates the specific area of study, in this case, implantology and restorative dentistry. Acknowledging the challenges and advancements within this field allows researchers to situate their contributions amid ongoing discourse, enhancing the overall understanding of how material choices affect implant success.

20) Lava:
In dental terminology, 'Lava' typically refers to a specific brand or type of CAD/CAM system used for fabricating dental crowns. Such technologies are significant for producing high-precision restorations, directly impacting the study’s focus on material fit and effectiveness in dental applications.

21) Babu:
Babu may refer to a contributor or researcher who has published studies related to dental materials and their effectiveness. Citing Babu’s work allows the study to draw connections with existing research, reinforcing the validity of findings regarding crown fit within the dental implant domain.

22) Hand:
The term 'hand' may refer to manual techniques used in the creation of crowns, particularly in traditional methods like lost wax casting. Understanding 'hand' processes versus CAD/CAM technologies enables a comparison of craftsmanship and precision in dental restoration fabrication, impacting overall fit outcomes.

23) Life:
In this context, 'life' pertains to the longevity and functional success of dental implants and restorations. Assessing the implications of material choices on the quality of life for patients underscores the importance of effective fit and reliable outcomes, driving advancements in dental materials and techniques.

Other Science Concepts:

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Discover the significance of concepts within the article: ‘Comparative study of vertical fit on implant abutments with crowns.’. Further sources in the context of Science might help you critically compare this page with similair documents:

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