The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro Study
Background: The marginal fit of crowns is of clinical importance. It is found that marginal and occlusal discrepancies are commonly increased following cementation. The resistance of cementing materials is a factor that prevents cast restorations from being correctly seated. Different finish lin...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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JCDR Research and Publications Private Limited
2015-08-01
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| Series: | Journal of Clinical and Diagnostic Research |
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| Online Access: | https://jcdr.net/articles/PDF/6283/12574_CE[Ra1]_F(AK)_PF1(PAK)_PFA(AK)_PF2(PAG).pdf |
| _version_ | 1818526976479068160 |
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| author | Vaishali Nemane Ravikumar Akulwar Suresh Meshram |
| author_facet | Vaishali Nemane Ravikumar Akulwar Suresh Meshram |
| author_sort | Vaishali Nemane |
| collection | DOAJ |
| description | Background: The marginal fit of crowns is of clinical importance.
It is found that marginal and occlusal discrepancies are commonly
increased following cementation. The resistance of cementing
materials is a factor that prevents cast restorations from being
correctly seated. Different finish lines behave differently in
facilitating the escape of the cement. When the escape path of
the cement decreases, the crown fails to seat further.
Materials and Methods: This study was planned with an aim
to evaluate the effect of various finish lines on the marginal
seal and occlusal seat of full crown preparations. Six stainless
steel metal dies were machined to simulate molar crown
preparations. The diameter was 10 mm and height was 6mm.
The occlusal surface was kept flat and a small circular dimple
was machined for reorientation of the wax pattern and metal
copings, margins of various designs were machined accurately.
The margins prepared were Group A- 900
C shoulder, Group BRounded shoulder, Group C- 45 degree sloped shoulder, Group
D- Chamfer, Group E- Long chamfer, Group F- Feather edge.
Full cast metal crowns of base metal alloy were fabricated over
the metal dies. Zinc phosphate luting cement was used for the
cementation. After twenty four hours, the cemented crown and
die assembly were embedded in clear acrylic resin so as to hold
the assembly together while sectioning. Twenty four hours later,
all the samples were sectioned sagitally.
The sectioned halves were focused under a stereomicroscope
and the cement spaces were measured to the nearest micron.
The cement thickness was measured at two points on the
occlusal surface and one at each margin.
Results: Significant differences were observed in the occlusal
seat and marginal seal of all the finish line configurations.
The rounded shoulder had the best occlusal seat, followed by
900
C shoulder. The occlusal seat and marginal seal afforded by
the shoulder finish lines were similar whereas there was a vast
difference in the seating and sealing of long chamfer and feather
edged preparations. They showed the worst occlusal seat.
Conclusion: It was found that the finish lines like shoulder
preparations which exhibit poor sealing prior to complete
cementation allow good seating whereas margins which seal
earlier do not allow escape of cement and hence do not seat
completely. |
| first_indexed | 2024-12-11T06:30:11Z |
| format | Article |
| id | doaj.art-0f580ba4dcc045528f0c3f74177606c7 |
| institution | Directory Open Access Journal |
| issn | 2249-782X 0973-709X |
| language | English |
| last_indexed | 2024-12-11T06:30:11Z |
| publishDate | 2015-08-01 |
| publisher | JCDR Research and Publications Private Limited |
| record_format | Article |
| series | Journal of Clinical and Diagnostic Research |
| spelling | doaj.art-0f580ba4dcc045528f0c3f74177606c72022-12-22T01:17:33ZengJCDR Research and Publications Private LimitedJournal of Clinical and Diagnostic Research2249-782X0973-709X2015-08-0198ZC18ZC2110.7860/JCDR/2015/12574.6283The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro StudyVaishali Nemane0Ravikumar Akulwar1Suresh Meshram2Lecturer, Department of Prosthodontics, Govt Dental College, Mumbai, India.Reader, Department of Prosthodontics, Midsr Dental College, Latur, India.Professor, Department of Prosthodontics, Swami Devi Dayal Hospital and Dental College, Panchkula, Chandigarh, India.Background: The marginal fit of crowns is of clinical importance. It is found that marginal and occlusal discrepancies are commonly increased following cementation. The resistance of cementing materials is a factor that prevents cast restorations from being correctly seated. Different finish lines behave differently in facilitating the escape of the cement. When the escape path of the cement decreases, the crown fails to seat further. Materials and Methods: This study was planned with an aim to evaluate the effect of various finish lines on the marginal seal and occlusal seat of full crown preparations. Six stainless steel metal dies were machined to simulate molar crown preparations. The diameter was 10 mm and height was 6mm. The occlusal surface was kept flat and a small circular dimple was machined for reorientation of the wax pattern and metal copings, margins of various designs were machined accurately. The margins prepared were Group A- 900 C shoulder, Group BRounded shoulder, Group C- 45 degree sloped shoulder, Group D- Chamfer, Group E- Long chamfer, Group F- Feather edge. Full cast metal crowns of base metal alloy were fabricated over the metal dies. Zinc phosphate luting cement was used for the cementation. After twenty four hours, the cemented crown and die assembly were embedded in clear acrylic resin so as to hold the assembly together while sectioning. Twenty four hours later, all the samples were sectioned sagitally. The sectioned halves were focused under a stereomicroscope and the cement spaces were measured to the nearest micron. The cement thickness was measured at two points on the occlusal surface and one at each margin. Results: Significant differences were observed in the occlusal seat and marginal seal of all the finish line configurations. The rounded shoulder had the best occlusal seat, followed by 900 C shoulder. The occlusal seat and marginal seal afforded by the shoulder finish lines were similar whereas there was a vast difference in the seating and sealing of long chamfer and feather edged preparations. They showed the worst occlusal seat. Conclusion: It was found that the finish lines like shoulder preparations which exhibit poor sealing prior to complete cementation allow good seating whereas margins which seal earlier do not allow escape of cement and hence do not seat completely.https://jcdr.net/articles/PDF/6283/12574_CE[Ra1]_F(AK)_PF1(PAK)_PFA(AK)_PF2(PAG).pdffixed partial dentureluting cementsmarginal fitocclusal seat |
| spellingShingle | Vaishali Nemane Ravikumar Akulwar Suresh Meshram The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro Study Journal of Clinical and Diagnostic Research fixed partial denture luting cements marginal fit occlusal seat |
| title | The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro Study |
| title_full | The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro Study |
| title_fullStr | The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro Study |
| title_full_unstemmed | The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro Study |
| title_short | The Effect of Various Finish Line Configurations on the Marginal Seal and Occlusal Discrepancy of Cast Full Crowns After Cementation - An In-vitro Study |
| title_sort | effect of various finish line configurations on the marginal seal and occlusal discrepancy of cast full crowns after cementation an in vitro study |
| topic | fixed partial denture luting cements marginal fit occlusal seat |
| url | https://jcdr.net/articles/PDF/6283/12574_CE[Ra1]_F(AK)_PF1(PAK)_PFA(AK)_PF2(PAG).pdf |
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