MARGINAL ADAPTATION OF VARIOUS CAD/CAM ALL-CERAMIC SUPERSTRUCTURES CEMENTED ON READY AND CUSTOM MADE ZIRCONIA ABUTMENTS | ||||
| Egyptian Dental Journal | ||||
| Article 21, Volume 63, Issue 2 - April (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics), April 2017, Page 1801-1818 PDF (1.38 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2017.75135 | ||||
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| Author | ||||
| Rasha N. Sami | ||||
| Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Cairo University | ||||
| Abstract | ||||
| Statement of the problem: In spite of the varied materials and techniques available for fabricating implant-supported superstructures, reaching an abutment/crown combination that provides standardized results and an accurate fit is still of utmost importance for the success of implant-supported restorations. Purpose of the study: This study aimed to evaluate the marginal adaptation of various CAD/CAM fabricated all-ceramic superstructures cemented on both ready and custom made zirconia abutments. Materials and methods: A total of 30 implant samples were divided into two main groups (n=15) according to the received zirconia abutment design as follows; Group I: readymade zirconia abutments with scalloped 0.5 mm chamfer finish line and Group II: custom made zirconia abutments with uniform 1mm deep chamfer finish line. According to the received ceramic superstructure material each group was further subdivided into three subgroups (n=5) namely; subgroup1: Vita Enamic, subgroup2: IPS e. max CAD and subgroup3: Zirconia. Vertical marginal gap measurements for different groups were carried before cementation using a digital microscope; measurements were repeated again after cementation of the superstructures each on its corresponding abutment. Data were statistically analyzed. Results: Regardless of ceramic superstructure material or cementation, it was found that the ready-made abutments recorded a statistically significant higher mean vertical marginal gap than the custom made abutments. Regardless of abutment designs or superstructure material; it was found that there was a statistically significant increase in mean marginal gap distance after cementation at P-value ≤ 0.05. Conclusions: Based on the clinical acceptability of 120 μm as a marginal gap, the results of the three all-ceramic superstructures were within the acceptable range for both tested abutments. Marginal gap values increased after cementation of various superstructures on different abutments. | ||||
| Keywords | ||||
| marginal adaptation; all-ceramic superstructures; custom abutment; cement-retained restorations; Lithium Disilicate; Zirconia; Vita Enamic | ||||
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