Effect of proximal box elevation on fracture resistance and microleakage of premolars restored with ceramic endocrowns.
<h4>Background</h4>Restoration of endodontically treated premolar is in high risk for biomechanical failure, and often presents with subgingival margins. Proximal box elevation (PBE) has been used to relocate subgingival cavity outlines.<h4>Objective</h4>To evaluate the influ...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2021-01-01
|
| Series: | PLoS ONE |
| Online Access: | https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0252269&type=printable |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850046170419691520 |
|---|---|
| author | Hong Zhang He Li Qian Cong Zhimin Zhang Aobo Du Ying Wang |
| author_facet | Hong Zhang He Li Qian Cong Zhimin Zhang Aobo Du Ying Wang |
| author_sort | Hong Zhang |
| collection | DOAJ |
| description | <h4>Background</h4>Restoration of endodontically treated premolar is in high risk for biomechanical failure, and often presents with subgingival margins. Proximal box elevation (PBE) has been used to relocate subgingival cavity outlines.<h4>Objective</h4>To evaluate the influence of PBE on fracture resistance and gingival microleakage of premolars with endodontic access cavities following ceramic endocrown.<h4>Methods</h4>Eighty sound maxillary premolars with standardized Class II cavities on mesial surfaces were randomly assigned to four groups (n = 20 in each group). Groups E1, E2 and E3, with proximal margins located in dentin/cementum, 2 mm below the cemento-enamel junction (CEJ), simulated subgingival location. Group E4 (supragingival group), with proximal margins located in enamel, 1 mm above the CEJ, was used as the positive control. For margin elevation of the proximal cavities, bulk-fill Smart Dentin Replacement (SDR), a visible light cured resin composite, was applied in group E1, and conventional resin composite (3M Z350 XT, a light-activated composite) was placed in group E2. Group E3 was only treated with a ceramic crown and served as the negative control. In all groups, computer-aided design (CAD) ceramic endocrowns were adhesively inserted, and fracture resistance, failure mode and microleakage were evaluated.<h4>Results</h4>A higher fracture resistance value was observed in PBE groups E1 and E2, regardless of the materials used (P = 0.038, and 0.010, respectively, vs E3), and fracture resistance in group E1 was higher than that in group E2. In teeth without PBE, the percentage of catastrophic failures reached 70%. Compared to group E3, a lower frequency distribution of microleakage was detected in supragingival group E4 (P = 0.031). No increased percentage of microleakage was observed in groups treated with PBE.<h4>Conclusion</h4>For endodontically treated maxillary premolars restored with ceramic endocrowns, PBE increases fracture resistance but not microleakage. |
| format | Article |
| id | doaj-art-9ca2b8ea42e64e4eac487d0691c5387a |
| institution | DOAJ |
| issn | 1932-6203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj-art-9ca2b8ea42e64e4eac487d0691c5387a2025-08-20T02:54:31ZengPublic Library of Science (PLoS)PLoS ONE1932-62032021-01-01165e025226910.1371/journal.pone.0252269Effect of proximal box elevation on fracture resistance and microleakage of premolars restored with ceramic endocrowns.Hong ZhangHe LiQian CongZhimin ZhangAobo DuYing Wang<h4>Background</h4>Restoration of endodontically treated premolar is in high risk for biomechanical failure, and often presents with subgingival margins. Proximal box elevation (PBE) has been used to relocate subgingival cavity outlines.<h4>Objective</h4>To evaluate the influence of PBE on fracture resistance and gingival microleakage of premolars with endodontic access cavities following ceramic endocrown.<h4>Methods</h4>Eighty sound maxillary premolars with standardized Class II cavities on mesial surfaces were randomly assigned to four groups (n = 20 in each group). Groups E1, E2 and E3, with proximal margins located in dentin/cementum, 2 mm below the cemento-enamel junction (CEJ), simulated subgingival location. Group E4 (supragingival group), with proximal margins located in enamel, 1 mm above the CEJ, was used as the positive control. For margin elevation of the proximal cavities, bulk-fill Smart Dentin Replacement (SDR), a visible light cured resin composite, was applied in group E1, and conventional resin composite (3M Z350 XT, a light-activated composite) was placed in group E2. Group E3 was only treated with a ceramic crown and served as the negative control. In all groups, computer-aided design (CAD) ceramic endocrowns were adhesively inserted, and fracture resistance, failure mode and microleakage were evaluated.<h4>Results</h4>A higher fracture resistance value was observed in PBE groups E1 and E2, regardless of the materials used (P = 0.038, and 0.010, respectively, vs E3), and fracture resistance in group E1 was higher than that in group E2. In teeth without PBE, the percentage of catastrophic failures reached 70%. Compared to group E3, a lower frequency distribution of microleakage was detected in supragingival group E4 (P = 0.031). No increased percentage of microleakage was observed in groups treated with PBE.<h4>Conclusion</h4>For endodontically treated maxillary premolars restored with ceramic endocrowns, PBE increases fracture resistance but not microleakage.https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0252269&type=printable |
| spellingShingle | Hong Zhang He Li Qian Cong Zhimin Zhang Aobo Du Ying Wang Effect of proximal box elevation on fracture resistance and microleakage of premolars restored with ceramic endocrowns. PLoS ONE |
| title | Effect of proximal box elevation on fracture resistance and microleakage of premolars restored with ceramic endocrowns. |
| title_full | Effect of proximal box elevation on fracture resistance and microleakage of premolars restored with ceramic endocrowns. |
| title_fullStr | Effect of proximal box elevation on fracture resistance and microleakage of premolars restored with ceramic endocrowns. |
| title_full_unstemmed | Effect of proximal box elevation on fracture resistance and microleakage of premolars restored with ceramic endocrowns. |
| title_short | Effect of proximal box elevation on fracture resistance and microleakage of premolars restored with ceramic endocrowns. |
| title_sort | effect of proximal box elevation on fracture resistance and microleakage of premolars restored with ceramic endocrowns |
| url | https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0252269&type=printable |
| work_keys_str_mv | AT hongzhang effectofproximalboxelevationonfractureresistanceandmicroleakageofpremolarsrestoredwithceramicendocrowns AT heli effectofproximalboxelevationonfractureresistanceandmicroleakageofpremolarsrestoredwithceramicendocrowns AT qiancong effectofproximalboxelevationonfractureresistanceandmicroleakageofpremolarsrestoredwithceramicendocrowns AT zhiminzhang effectofproximalboxelevationonfractureresistanceandmicroleakageofpremolarsrestoredwithceramicendocrowns AT aobodu effectofproximalboxelevationonfractureresistanceandmicroleakageofpremolarsrestoredwithceramicendocrowns AT yingwang effectofproximalboxelevationonfractureresistanceandmicroleakageofpremolarsrestoredwithceramicendocrowns |