Marginal gap and internal fit of 3D printed versus milled monolithic zirconia crowns
Abstract Background This study aimed to evaluate and compare the marginal gap using two different methods and the internal fit of 3D printed and zirconia crowns. Methods 3Y-TZP zirconia crowns (n = 20) were manufactured using subtractive milling (group M) and 3D printed (group P). The marginal gap w...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
BMC
2023-07-01
|
| Series: | BMC Oral Health |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s12903-023-03184-8 |
| _version_ | 1797784379458584576 |
|---|---|
| author | Ashraf Refaie Ahmed Fouda Christoph Bourauel Lamia Singer |
| author_facet | Ashraf Refaie Ahmed Fouda Christoph Bourauel Lamia Singer |
| author_sort | Ashraf Refaie |
| collection | DOAJ |
| description | Abstract Background This study aimed to evaluate and compare the marginal gap using two different methods and the internal fit of 3D printed and zirconia crowns. Methods 3Y-TZP zirconia crowns (n = 20) were manufactured using subtractive milling (group M) and 3D printed (group P). The marginal gap was measured at 60 points using vertical marginal gap technique (VMGT). On the other hand, the silicone replica technique (SRT) was used to evaluate the internal fit and was divided into 4 groups: marginal gap, cervical gap, axial gap, and occlusal gap where the thickness of light impression was measured at 16 references. The numerical data was tested for normality using Shapiro–Wilk's test. They were found to be normally distributed and were analyzed using an independent t-test. Results Using VMGT, group P had significantly higher mean marginal gap values of 80 ± 30 µm compared to group M = 60 ± 20 µm (p < 0.001). Also, with the SRT, the marginal gap of group P (100 ± 10 µm) had significantly higher values compared to group M (60 ± 10 µm). The internal fit showed significant difference between the tested groups except for Axial Gap. Conclusions Although milled crowns showed better results. The 3D printed zirconia crowns offer clinically acceptable results in terms of marginal adaptation and internal fit. Both VMGT and SRT are reliable methods for the assessment of the marginal gap. |
| first_indexed | 2024-03-13T00:39:03Z |
| format | Article |
| id | doaj.art-c6162ea673f84803aeccd57c1dd1ac26 |
| institution | Directory Open Access Journal |
| issn | 1472-6831 |
| language | English |
| last_indexed | 2024-03-13T00:39:03Z |
| publishDate | 2023-07-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Oral Health |
| spelling | doaj.art-c6162ea673f84803aeccd57c1dd1ac262023-07-09T11:26:49ZengBMCBMC Oral Health1472-68312023-07-012311710.1186/s12903-023-03184-8Marginal gap and internal fit of 3D printed versus milled monolithic zirconia crownsAshraf Refaie0Ahmed Fouda1Christoph Bourauel2Lamia Singer3Oral Medicine Technology, University Hospital BonnOral Medicine Technology, University Hospital BonnOral Medicine Technology, University Hospital BonnOral Medicine Technology, University Hospital BonnAbstract Background This study aimed to evaluate and compare the marginal gap using two different methods and the internal fit of 3D printed and zirconia crowns. Methods 3Y-TZP zirconia crowns (n = 20) were manufactured using subtractive milling (group M) and 3D printed (group P). The marginal gap was measured at 60 points using vertical marginal gap technique (VMGT). On the other hand, the silicone replica technique (SRT) was used to evaluate the internal fit and was divided into 4 groups: marginal gap, cervical gap, axial gap, and occlusal gap where the thickness of light impression was measured at 16 references. The numerical data was tested for normality using Shapiro–Wilk's test. They were found to be normally distributed and were analyzed using an independent t-test. Results Using VMGT, group P had significantly higher mean marginal gap values of 80 ± 30 µm compared to group M = 60 ± 20 µm (p < 0.001). Also, with the SRT, the marginal gap of group P (100 ± 10 µm) had significantly higher values compared to group M (60 ± 10 µm). The internal fit showed significant difference between the tested groups except for Axial Gap. Conclusions Although milled crowns showed better results. The 3D printed zirconia crowns offer clinically acceptable results in terms of marginal adaptation and internal fit. Both VMGT and SRT are reliable methods for the assessment of the marginal gap.https://doi.org/10.1186/s12903-023-03184-8Yttria-stabilized zirconia crowns3D printingSubtractive manufacturingMarginal gapInternal fit |
| spellingShingle | Ashraf Refaie Ahmed Fouda Christoph Bourauel Lamia Singer Marginal gap and internal fit of 3D printed versus milled monolithic zirconia crowns BMC Oral Health Yttria-stabilized zirconia crowns 3D printing Subtractive manufacturing Marginal gap Internal fit |
| title | Marginal gap and internal fit of 3D printed versus milled monolithic zirconia crowns |
| title_full | Marginal gap and internal fit of 3D printed versus milled monolithic zirconia crowns |
| title_fullStr | Marginal gap and internal fit of 3D printed versus milled monolithic zirconia crowns |
| title_full_unstemmed | Marginal gap and internal fit of 3D printed versus milled monolithic zirconia crowns |
| title_short | Marginal gap and internal fit of 3D printed versus milled monolithic zirconia crowns |
| title_sort | marginal gap and internal fit of 3d printed versus milled monolithic zirconia crowns |
| topic | Yttria-stabilized zirconia crowns 3D printing Subtractive manufacturing Marginal gap Internal fit |
| url | https://doi.org/10.1186/s12903-023-03184-8 |
| work_keys_str_mv | AT ashrafrefaie marginalgapandinternalfitof3dprintedversusmilledmonolithiczirconiacrowns AT ahmedfouda marginalgapandinternalfitof3dprintedversusmilledmonolithiczirconiacrowns AT christophbourauel marginalgapandinternalfitof3dprintedversusmilledmonolithiczirconiacrowns AT lamiasinger marginalgapandinternalfitof3dprintedversusmilledmonolithiczirconiacrowns |