Evaluation of the marginal fit of full ceramic crowns by the microcomputed tomography (micro-CT) technique

ABSTRACT Objective: To evaluate the marginal gap (MG) and absolute marginal discrepancy (MD) of full ceramic crowns with two finish line designs, shoulder and chamfer, using microcomputed tomography (micro-CT) before and after cementation. Materials and Methods: Sixty extracted human maxillary premolar teeth were divided into two groups based on the finish line design: Group I: 90° shoulder and Group II: 135° chamfer. The specimens were further grouped based on the type of full ceramic crown they received: Group A: Feldspathic Cerec inLab ceramic system, Group B: Cerec inLab aluminum oxide ceramic system and Group C: Lithium disilicate press ceramic system. Before cementation, five crowns from each group were scanned using micro-CT in two sections, sagittal and coronal, to determine the MG and MD values for four regions of the crown (sagittal buccal, sagittal lingual, coronal mesial and coronal distal). After cementation and thermal cycling, the scanning was repeated. Measurements were obtained from 10 points for each region, 80 points totally, to evaluate the MG and MD values. Files were processed using NRecon and CTAn software. Results were statistically analyzed using one- and two-way ANOVA and Tukey HSD tests (P = 0.05). Results: Full ceramic systems showed clinically acceptable marginal adaptation values. The Feldspathic Cerec inLab ceramic system generally presented the lowest variance, except in the MG values of the coronal mesial region. The MG and MD values of all ceramics increased significantly after cementation, except in the shoulder preparation design (sagittal buccal region) for MG and in the chamfer preparation design (sagittal lingual region) for MD values. Conclusions: Full-ceramic crowns showed clinically acceptable marginal adaptation values. The Feldspathic Cerec inLab ceramic system (Vitablocs Mark II) generally presented the lowest variance when compared with the other ceramics, except for the MG values on the mesial surface of the coronal section.

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Influence of finish line design on marginal adaptation of electroformed metal-ceramic crowns

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2006.01.009 ◽

2006 ◽

Vol 95 (3) ◽

pp. 237-242 ◽

Cited By ~ 19

Author(s):

Hisaka Shiratsuchi ◽

Futoshi Komine ◽

Yoshiyuki Kakehashi ◽

Hideo Matsumura

Keyword(s):

Marginal Adaptation ◽

Finish Line ◽

Metal Ceramic ◽

Ceramic Crowns ◽

Line Design

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Influence of Cervical Finish Line Type on the Marginal Adaptation of Zirconia Ceramic Crowns

Operative Dentistry ◽

10.2341/08-076-l ◽

2009 ◽

Vol 34 (5) ◽

pp. 586-592 ◽

Cited By ~ 34

Author(s):

M. Comlekoglu ◽

M. Dundar ◽

M. Özcan ◽

M. Gungor ◽

B. Gokce ◽

...

Keyword(s):

Clinical Relevance ◽

Clinical Applications ◽

Zirconia Ceramic ◽

Marginal Adaptation ◽

Finish Line ◽

Zirconia Crowns ◽

Ceramic Crowns ◽

Line Type

Clinical Relevance Cervical finish line type has an influence on the marginal adaptation of Y-TZP restorations. Both shoulder and mini-chamfer exhibited the least marginal opening values for zirconia crowns and can be recommended for clinical applications.

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Evaluation of marginal adaptation of CAD/CAM vs conventional all-ceramic crowns on an implant abutment: An in vitro study

International Journal of Oral Health Dentistry ◽

10.18231/j.ijohd.2021.023 ◽

2021 ◽

Vol 7 (2) ◽

pp. 104-109

Author(s):

Himanshu Aeran ◽

Megha Sagar ◽

Jyotsna Seth

Keyword(s):

Marginal Adaptation ◽

Marginal Fit ◽

Group I ◽

All Ceramic ◽

Cad Cam ◽

Marginal Discrepancy ◽

Laboratory Procedures ◽

Ceramic Crowns ◽

The Mean ◽

Vertical Gap

The survival of fixed prosthodontic restorations depends on the state of the marginal adaptation. Marginal gaps can create a favourable condition for biofilm deposition, thereby contributing to the development of caries and periodontal disease. The longevity of fixed prosthodontic restorations depends on the condition of the marginal adaptation to the abutment teeth. The presented work aimed to study, evaluate and compare the marginal adaptation of All-Ceramic crowns fabricated using conventional laboratory procedures with those fabricated using the CAD/CAM technology.To compare the marginal fit and adaptation of All- Ceramic crowns obtained by conventional techniques and crowns obtained by CAD/CAM technique. The presented study focused on a total of 20 samples divided into two groups viz. Group I (Conventional) and Group II (CAD/CAM) having 10 sample each. The samples were prepared with the straight abutment having a standardized collar height of 2mm, HIOSSEN that was mounted on acrylic blocks using implant analogue, HIOSSEN. A set of crowns was produced by 5-axis milling lithium disilicate using glass-ceramic blocks with laboratory fabrication methods. Another set of zirconia crowns was produced using CAD/CAM technology. Circumferential marginal gap measurements were taken at 12 measurement locations on the hexagonal die marked equidistant to each other. Both the samples were measured for marginal discrepancy at under the stereomicroscope.The results obtained showed that the mean vertical gap for the group II samples showed the least variation in the marginal discrepancy. Although the mean obtained for both the groups showed that the mean vertical marginal discrepancy was within the clinically acceptable level.It can be concluded that within the limitation of the study the data obtained showed that The Mean vertical gap was the maximum for Group I (Conventional group) i.e. 49.25 µm showing maximum variation in marginal fit. While the CAD/CAM Group had shown least vertical marginal discrepancy which depicts statistically significant better marginal fit than those fabricated using conventional laboratory procedures.

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A Comparitive Evaluation of the Marginal Adaptation of Zirconium Coping and Nickel–Chromium Coping Using Shoulder Finish Line Design: An Invitro Study

The Journal of Indian Prosthodontic Society ◽

10.1007/s13191-012-0175-0 ◽

2012 ◽

Vol 12 (4) ◽

pp. 248-251

Author(s):

S. Chandrashekar ◽

Ravindra C. Savadi ◽

Malathi Dayalan ◽

G. T. Prashanth Reddy

Keyword(s):

Marginal Adaptation ◽

Finish Line ◽

Nickel Chromium ◽

Line Design

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Marginal adaptation of zirconium dioxide copings: Influence of the CAD/CAM system and the finish line design

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2013.10.012 ◽

2014 ◽

Vol 112 (2) ◽

pp. 155-162 ◽

Cited By ~ 47

Author(s):

Raúl Euán ◽

Oscar Figueras-Álvarez ◽

Josep Cabratosa-Termes ◽

Rogelio Oliver-Parra

Keyword(s):

Zirconium Dioxide ◽

Marginal Adaptation ◽

Finish Line ◽

Cad Cam ◽

Line Design

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EFFECT OF FINISH LINE DESIGN AND THERMO-MECHANICAL AGING ON THE FRACTURE RESISTANCE OF TWO TYPES OF MONOLITHIC ZIRCONIA CROWNS

Egyptian Dental Journal ◽

10.21608/edj.2017.76461 ◽

2017 ◽

Vol 63 (4) ◽

pp. 3947-3953

Author(s):

Khaled Haggag ◽

Mohammed Hosny ◽

Muhammad Abbas ◽

Hussein Ramadan

Keyword(s):

Fracture Resistance ◽

Finish Line ◽

Zirconia Crowns ◽

Monolithic Zirconia ◽

Line Design ◽

Mechanical Aging

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Marginal Integrity of CAD/CAM Ceramic Crowns Using Two Different Finish Line Designs

Medical Principles and Practice ◽

10.1159/000516833 ◽

2021 ◽

Author(s):

Jaber Hussain Akbar ◽

Ridwaan Omar ◽

Yacoub Al Tarakmah

Keyword(s):

Dental Treatment ◽

Statistical Significance ◽

United States Public Health ◽

Finish Line ◽

Marginal Integrity ◽

Computer Aided ◽

Cad Cam ◽

Group A ◽

Group B ◽

Line Design

Statement of problem- Research on evaluation of crowns made by the latest CAD/CAM systems for their marginal adaptation is scarce. Purpose- The purpose of this in vitro study was to evaluate the marginal integrity of crowns fabricated by the latest Chairside Economical Restorations of Esthetic Ceramic (CEREC) system using two different finish line preparation designs: Chamfer and Shoulder. Material and methods- Typhodont teeth were equally divided into two groups, group A and B. The teeth were prepared for full coverage crowns with a shoulder (group A) and chamfer finish line design (group B). An experienced prosthodontist prepared all crown preparations. Evaluation of six sites per sample was completed by two calibrated, experienced prosthodontists using the modified United States Public Health Services (USPHS) criteria. The descriptive statistics and Z-test were used to evaluate the results. Results- A total of 180 teeth were included in the study (90 teeth in each group). Only two crowns in group A and one crown in group B were clinically unacceptable. There was no statistical significance (p=0.282) between the two groups regarding finish-line design. Conclusions- CEREC system provides clinically acceptable crowns and can safely be utilized in dental treatment. Therefore, Contemporary Dental Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) restorations should be considered as a safe treatment modality by dental professionals.

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