Consistency of Labial Finish Line Preparation for Metal Ceramic Crowns: An Investigation of a New Bur

The aim of this study was to evaluate the vertical marginal gap of sintered gold copings and metal-ceramic crowns with different finish line preparations: a beveled round shoulder (BRS) and a beveled long chamfer (BLC), testing the null hypotheses that there are no differences in marginal gap regardless of finish line and phase of restoration (coping or crown). Stainless steel master models were fabricated to simulate tooth preparation for metal-ceramic crowns with different finish lines (BRS and BLC). Ten dies were obtained from each model. Preparations were coated with 2 layers of spacer to 1 mm from the margin. Sintercast gold copings were prepared, sintered and adjusted to the dies. The copings (n=10) were placed onto the master model and the marginal gap was measured in 24 equidistant points using optical microscopy (X230). An opaque and two body ceramic layers were subsequently applied to the copings and the same measuring procedure was performed for the crowns. The data were analyzed statistically using paired and unpaired Student's t-test (α=0.05). Mean marginal gap values (µm) for the copings and crowns were, respectively: 113.6 and 117.1 for the BRS; and 58.2 and 74.3 for the BLC preparation. Significantly greater marginal gaps (p=0.0307) were found for restorations with BRS than with BLC finish line, which also showed statistically significant differences in the gap size between coping and crown (p=0.001). In conclusion, marginal gap is influenced by ceramic application on copings fabricated on BLC preparation, and greater marginal gaps were found for restorations with BRS finish line, rejecting the experimental null hypotheses.

Download Full-text

Veterans Administration Cooperative Studies Project No. 147. Part III: Assessment of blindness in a clinical evaluation of alternative alloys for metal-ceramic crowns

Journal of Prosthetic Dentistry ◽

10.1016/0022-3913(86)90146-0 ◽

1986 ◽

Vol 56 (6) ◽

pp. 692-697 ◽

Cited By ~ 5

Author(s):

Harold F. Morris

Keyword(s):

Clinical Evaluation ◽

Veterans Administration ◽

Metal Ceramic ◽

Ceramic Crowns

Download Full-text

PROSPECTS FOR MANUFACTURING FRAMES OF METAL CERAMIC STRUCTURES OF DENTAL PROSTHESES BY THE METHOD OF SELECTIVE LASER SINTERING

"Medical & pharmaceutical journal "Pulse" ◽

10.26787/nydha-2686-6838-2021-23-6-232-239 ◽

2021 ◽

pp. 232-239

Author(s):

Stepanov V.A. ◽

Shemonaev V.I. ◽

Buyanov E.A. ◽

Grachev D.V. ◽

Parchomenko A.N. ◽

...

Keyword(s):

Objective Assessment ◽

Selective Laser Sintering ◽

Clinical Effectiveness ◽

Study Groups ◽

Laser Sintering ◽

Dental Prostheses ◽

Metal Ceramic ◽

Abutment Teeth ◽

Ceramic Crowns ◽

Solid Tissues

The article presents the results of evaluating the prototyping of metal-ceramic structures made by casting and selective laser sintering. To achieve this goal, 27 patients with fabricated metal-ceramic crowns and bridgeworks were examined. Two study groups were created. The first group included 14 patients for whom dental prosthesis frameworks were made by casting. The second group consisted of 13 people, for whom the frames of dentures were made by the method of selective laser sintering. The analysis of clinical effectiveness was carried out according to the following criteria: 1- precision of the felling of prosthesis frame to solid tissues of abutment teeth; 2- the condition of the marginal periodontium; 3- the integrity of the ceramic cladding. The results of the study showed that the precision to solid tooth tissues of metal-ceramic dental prostheses made by laser selective sintering is higher than of frames made by casting. In accordance to the second criteria the best results were also shown by the participants of the second group. No chipping of the ceramic veneer from the metal-ceramic denture frameworks made by laser selective sintering was found. Thus, dentures which frameworks are made by the method of selective laser sintering are characterized by a higher objective assessment of their precision to the solid tissues of the abutment teeth. Lesions of the marginal periodontium both inflammatory and dystrophic were less in the participants of the second group. The frequency of defects in the coating of metal-ceramic dentures was significantly lower in the case of fabrication frameworks by laser selective sintering.

Download Full-text

Precision of fit of two margin designs for metal-ceramic crowns

Primary Dental Care ◽

10.1308/135576108783328382 ◽

2008 ◽

Vol os15 (1) ◽

pp. 32-32

Author(s):

P Limkangwalmongkol ◽

GJ Chiche ◽

MB Blatz

Keyword(s):

Metal Ceramic ◽

Ceramic Crowns

Download Full-text

Oral Rehabilitation of Severe Dentoalveolar Trauma: A Clinical Report

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-10-00121 ◽

2012 ◽

Vol 38 (6) ◽

pp. 757-761 ◽

Cited By ~ 2

Author(s):

Fonda G. Robinson ◽

Larry L. Cunningham

Keyword(s):

Clinical Examination ◽

Motor Vehicle ◽

Motor Vehicle Accident ◽

Clinical Report ◽

Oral Rehabilitation ◽

Endosseous Implants ◽

Vehicle Accident ◽

Metal Ceramic ◽

Dentoalveolar Trauma ◽

Ceramic Crowns

This clinical report describes the oral rehabilitation of an adult male who suffered severe dentoalveolar trauma as a result of a motor vehicle accident. The specific objectives of this treatment were to restore esthetics and masticatory function. Treatment included removal of fractured roots, placement of multiple endosseous implants, and placement of anterior and posterior metal-ceramic crowns and fixed partial dentures. Three year clinical examination revealed no pathology associated with the rehabilitation. The patient's esthetic and functional expectations were successfully achieved.

Download Full-text

Influence of veneering technique on the fit of metal-ceramic crowns

Dental Materials ◽

10.1016/j.dental.2018.08.135 ◽

2018 ◽

Vol 34 ◽

pp. e65-e66 ◽

Cited By ~ 1

Author(s):

P. Kunz ◽

A.B.F. Fernandes ◽

L.F. Cunha ◽

G.M. Correr ◽

C.C. Gonzaga

Keyword(s):

Metal Ceramic ◽

Ceramic Crowns

Download Full-text

Features of odontopreparation for metal-ceramic crowns using dental navigation technologies

Rossiiskaya stomatologiya ◽

10.17116/rosstomat20211404138 ◽

2021 ◽

Vol 14 (4) ◽

pp. 38

Author(s):

A.V. Ivaschenko ◽

A.E. Yablokov ◽

A.M. Nesterov ◽

M.V. Shcherbakov ◽

I.O. Buentsov ◽

...

Keyword(s):

Metal Ceramic ◽

Ceramic Crowns

Download Full-text

Comparison of Different Cervical Finish Lines of All-Ceramic Crowns on Primary Molars in Finite Element Analysis

Materials ◽

10.3390/ma13051094 ◽

2020 ◽

Vol 13 (5) ◽

pp. 1094 ◽

Cited By ~ 1

Author(s):

Chin-Yun Pan ◽

Ting-Hsun Lan ◽

Pao-Hsin Liu ◽

Wan-Ru Fu

Keyword(s):

Finite Element ◽

Maximum Stress ◽

Primary Root ◽

Biomechanical Analysis ◽

Primary Tooth ◽

Finish Line ◽

Element Analysis ◽

All Ceramic ◽

Ceramic Crowns ◽

Loading Type

This study aimed to conduct a stress analysis of four types of cervical finish lines in posterior all-ceramic crowns on the primary roots of molar teeth. Four different types of finish lines (shoulder 0.5 mm, feather-edged, chamfer 0.6 mm, and mini chamfer 0.4 mm) and two all-ceramic crown materials (zirconia and lithium disilicate) were used to construct eight finite element primary tooth models with full-coverage crowns. A load of 200 N was applied at two different loading angles (0° and 15°) so as to mimic children’s masticatory force and occlusal tendency. The maximum stress distribution from the three-dimensional finite element models was determined, and the main effect of each factor (loading type, material, and finish line types) was evaluated in terms of the stress values for all of the models. The results indicated that the loading type (90.25%) was the main factor influencing the maximum stress value of the primary root, and that the feather-edged margin showed the highest stress value (p = 0.002). In conclusion, shoulder and chamfer types of finish lines with a 0.4–0.6 mm thickness are recommended for deciduous tooth preparation, according to the biomechanical analysis.

Download Full-text