Premolar Axial Wall Height Effect on CAD/CAM Crown Retention
| Autor: | Howard W. Roberts, C Gillette, Michael Wajdowicz, S Cushen, Nicholas DuVall, R Buck |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
medicine.medical_treatment Dentistry CAD Crown (dentistry) Random Allocation 03 medical and health sciences 0302 clinical medicine Dental porcelain Premolar medicine Humans Bicuspid General Dentistry Orthodontics Random allocation Crowns business.industry 030206 dentistry Dental Porcelain Resin Cements medicine.anatomical_structure Dental Prosthesis Design Computer-Aided Design business 030217 neurology & neurosurgery |
| Zdroj: | Operative Dentistry. 41:666-671 |
| ISSN: | 1559-2863 0361-7734 |
| DOI: | 10.2341/16-086-l |
| Popis: | SUMMARY Objective: To evaluate the significance of reduced axial wall height on retention of adhesively luted, all-ceramic, lithium disilicate premolar computer-aided design/computer-aided manufacturing (CAD/CAM) crowns based on preparations with a near ideal total occlusal convergence of 10°. Methods: Forty-eight recently extracted premolars were randomly divided into four groups (n=12). Each group received all-ceramic CAD/CAM crown preparations featuring axial wall heights of 0, 1, 2, and 3 mm, respectively, all with a 10° total occlusal convergence. Scanned preparations were fitted with lithium disilicate all-ceramic crowns that were luted with a self-etching resin cement. Specimens were tested to failure at a 45° angle to the tooth long axis with failure load converted to megapascals (MPa) based on the measured bonding surface area. Mean data were analyzed using analysis of variance/Tukey's post hoc test (α=0.05). Results: Lithium disilicate crowns adhesively luted on preparations with 0 axial wall height demonstrated significantly less failure resistance compared with the crowns luted on preparations with axial wall heights of 1 to 3 mm. There was no failure stress difference between preparations with 1 to 3 mm axial wall height. Conclusions: Under conditions of this study, adhesively luted lithium disilicate bicuspid crowns with a total occlusal convergence of 10° demonstrated similar failure resistance independent of axial wall height of 1 to 3 mm. This study provides some evidence that adhesion combined with an ideal total occlusal convergence may compensate for reduced axial wall height. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|