The mean marginal bone level change between the 1 month and the 1 year follow-up was -0.17 ± 0.46 mm. The plaque accumulation, presence of calculus, bleeding tendency and peri-implant inflammation indices were low, representing healthy peri-implant conditions. Clinical, radiographic, and patient-reported outcome measures were collected at baseline before implant placement and then during the 1 month and 1 year follow-ups.Īt the 1 year follow-up, 49 restorations could be evaluated. Two weeks after mucosa healing, a screw-retained monolithic zirconia restoration with a CAD/CAM titanium abutment was placed. Implant uncovering and healing abutment placement occurred 12 weeks after insertion. Parallel-walled implants with a conical connection were inserted in a two-stage surgical procedure. ![]() In a prospective case series, 50 molar sites in the posterior region of 46 patients with a minimum age of 18 years and sufficient bone volume and anatomical conditions for placing an implant (≥8 mm) and an anatomical restoration were included. To assess the clinical, radiographic, and patient-reported outcome measures, including the success of screw-retained monolithic zirconia implant-supported restorations with CAD/CAM titanium abutments in the posterior region during a 1-year follow-up. Monolithic-LDS ISSC showed high reliability as an all-ceramic material for screw-retained posterior hybrid-abutment-crowns. Premature chipping fractures might occur in PFZ ISSC. All ISSC failed in a range above physiological chewing forces. PFM ISSC showed significantly higher failure loads after fatigue than PFZ (p = 0.032). PFZ ISSC showed significantly lower failure-loads than monolithic-LDS regardless of artificial aging (p < 0.05). Fatigue did not influence load to failure of any group. All PFM and LDS crowns survived fatigue exposure, whereas 16.7% of PFZ showed chipping failures. Comparisons were statistically analyzed with t-tests and regression-models and corrected for multiple-testing using the Student–Neuman–Keuls method. All samples were exposed to single-load-to-failure without (PFM0, PFZ0, LDS0) or with fatigue (PFM1, PFZ1, LDS1). Half of the specimens (n = 12/group) were subjected to fatigue in a chewing-simulator (1.2 million cycles, 198 N, 1.67 Hz, thermocycling 5–55 ☌). To evaluate the failure-load and survival-rate of screw-retained monolithic and bi-layered crowns bonded to titanium-bases before and after mouth-motion fatigue, 72 titanium-implants (SICvantage-max, SIC-invent-AG) were restored with three groups (n = 24) of screw-retained CAD/CAM implant-supported-single-crowns (ISSC) bonded to titanium-bases: porcelain-fused-to-metal (PFM-control), porcelain-fused-to-zirconia (PFZ-test) and monolithic LDS (LDS-test). Screw-retained solitary monolithic zirconia restorations on ti-base abutments show low complication- and survival rates in the short term. The use of IOS resulted in shorter adjustment times at try-in than conventional impressions for solitary CAD/CAM implant restorations. All 45 restorations could be placed within the two planned appointments and only two minor mechanical complications occurred during the first year of function. A proper fit (no adjustments required) was achieved 39,1% in the digital and 18,2% conventional group respectively. The average adjustment time was 3.35 min (SD ☓.38, range: 0-11 min) for the digital vs. Additionally, restoration survival and mechanical complications with a follow-up of one year was documented.ģ2 Patients with 45 implants were included: 23 restorations in the test (IOS) and 22 in the control (conventional) group. The time required for adjustments at placement was recorded. Randomization was performed after impression taking and patients were to receive either a crown based on the digital or the conventional impression. Of all patients impressions were taken with both an IOS (3M™ TDS) and a conventional (polyether) pick-up impression. Patients with posterior tissue level implants (Straumann RN) replacing solitary teeth were recruited. The purpose of this randomized clinical trial was to compare the required time of potential clinical adjustments of posterior screw-retained monolithic zirconia implant retained crowns based on intraoral optical scanning (IOS) or conventional impressions.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |