| Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | Clinical Oral Investigations | ||||
| Publisher: | SPRINGER HEIDELBERG | ||||
| Place of Publication: | HEIDELBERG | ||||
| Volume: | 27 | ||||
| Number of Issue or Book Chapter: | 8 | ||||
| Page Range: | pp. 4379-4387 | ||||
| Date: | 2023 | ||||
| Institutions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik | ||||
| Identification Number: |
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| Keywords: | ENDODONTICALLY TREATED TEETH; ALVEOLAR BONE LOSS; IN-VITRO; PROSTHETIC TREATMENT; CANAL TREATMENT; ABUTMENT TEETH; TOOTH; POST; OUTCOMES; FERRULE; Dental caries; Dental cements; Dental restoration failure; Dental restoration; Permanent; Tooth; Nonvital; Resin cements; Nonvital tooth; Nonvital teeth; Endodontically treated teeth; Endodontically treated tooth | ||||
| Dewey Decimal Classification: | 600 Technology > 610 Medical sciences Medicine | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Yes | ||||
| Item ID: | 75942 |
Web of ScienceAbstract
ObjectivesThis study aims to investigate the load-to-fracture of procedures changing crown-to-root ratio (R-CRR) aimed to restore severely damaged upper central incisors to avoid tooth extraction compared to implant placement. There is no evidence on load capability after apical root resection (AR), orthodontic extrusion (OE), and surgical crown lengthening (SCL) in respect to R-CRR, ...
Abstract
ObjectivesThis study aims to investigate the load-to-fracture of procedures changing crown-to-root ratio (R-CRR) aimed to restore severely damaged upper central incisors to avoid tooth extraction compared to implant placement. There is no evidence on load capability after apical root resection (AR), orthodontic extrusion (OE), and surgical crown lengthening (SCL) in respect to R-CRR, respectively.Material and methodsHuman maxillary central incisors were endodontically treated, decoronated, and divided into 4 groups (n = 48). The following specimen preparation was performed: (I) adhesive core-and-post build-up (control), (II) as (I) and 2 mm apical root resection (AR), (III) before adhesive core-and-post build-up teeth were shortened 2 mm coronally (OE) (IV) as (I), but specimens were embedded 4 mm instead of 2 mm below the CEJ (SCL), group (V) implant-borne restoration with individual all-ceramic abutments (n = 12; null 4.1/l = 12 mm) (IBR). All specimens received all-ceramic crowns, thermo-mechanical (TML), and subsequent linear loading (LL) until failure. R-CRR were calculated and log-rank, Kruskal-Wallis, Mann-Whitney U, ANOVA, and chi-square tests applied (p = 0.05).ResultsFracture loads after subsequent LL differed significantly (p = 0.001) between groups, while implants showed the highest values. F-max median (min/max) were as follows: (I) 252 (204/542), (II) 293 (243/443), (III) 253 (183/371), (IV) 195 (140/274), and (V) 446 (370/539). Pair-wise comparison showed significant differences (p = 0.001) between group I/IV and group V, I, and IV (p = 0.045), II and IV (p = 0.001), and III compared to IV (p = 0.033), respectively. R-CRR below 1 significantly increased load capability compared to R-CRR = 1.ConclusionsOE appears to preferably ensure biomechanical stability of teeth that are endodontically treated and receive core-and-post and crown placement compared to SCL. AR has no adverse biomechanical impact. R-CRR < 1 is biomechanically beneficial.
Metadata last modified: 18 Mar 2025 10:07
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