Effect of the Crystallization Process on the Marginal and Internal Gaps of Lithium Disilicate CAD/CAM Crowns
| Autor: | Jae-Hong Kim, Soo-Hyuk Uhm, Seunghan Oh |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Molar
Materials science Article Subject Surface Properties medicine.medical_treatment Silicones lcsh:Medicine Dentistry 02 engineering and technology General Biochemistry Genetics and Molecular Biology Crown (dentistry) law.invention 03 medical and health sciences 0302 clinical medicine Dental porcelain law medicine Lithium disilicate Composite material Crystallization Mandibular right first molar Tooth Crown General Immunology and Microbiology business.industry lcsh:R 030206 dentistry General Medicine Dental Marginal Adaptation 021001 nanoscience & nanotechnology Dental Porcelain Dental Prosthesis Design Computer-Aided Design 0210 nano-technology business Abutment (dentistry) Research Article |
| Zdroj: | BioMed Research International, Vol 2016 (2016) BioMed Research International |
| ISSN: | 2314-6141 2314-6133 |
| DOI: | 10.1155/2016/8635483 |
| Popis: | The aim of this study is to quantify the effect of the crystallization process on lithium disilicate ceramic crowns fabricated using a computer-aided design/computer-aided manufacturing (CAD/CAM) system and to determine whether the effect of crystallization is clinically acceptable by comparing values of fit before and after the crystallization process. The mandibular right first molar was selected as the abutment for the experiments. Fifteen working models were prepared. Lithium disilicate crowns appropriate for each abutment were prepared using a commercial CAD/CAM system. Gaps in the marginal area and 4 internal areas of each crown were measured twice—before and after crystallization—using the silicone replica technique. The mean values of fit before and after crystallization were analyzed using a pairedt-test to examine whether the conversion that occurred during crystallization affected marginal and internal gaps (α=0.05). Gaps increased in the marginal area and decreased in the internal areas after crystallization. There were statistically significant differences in all of the investigated areas (P<0.05). None of the values for marginal and internal fit of lithium disilicate CAD/CAM crowns after crystallization exceeded 120μm, which is the clinically acceptable threshold. |
| Databáze: | OpenAIRE |
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