Protetik Diş Tedavisi Bölümühttps://hdl.handle.net/11655/292024-03-29T00:12:44Z2024-03-29T00:12:44ZTemizleme Yöntemlerinin Tükürük ile Kontamine Yüksek Translüsens Zirkonyanın Bağlanma Dayanımına EtkisiCengiz, Amine Kübrahttps://hdl.handle.net/11655/271542022-11-25T07:44:48Z2022-01-01T00:00:00ZTemizleme Yöntemlerinin Tükürük ile Kontamine Yüksek Translüsens Zirkonyanın Bağlanma Dayanımına Etkisi
Cengiz, Amine Kübra
CENGİZ A.K., The effect of cleaning methods on the bond strength of saliva contaminated high translucent zirconia. Hacettepe University, Faculty of Dentistry, Thesis in Prosthodontics, Ankara, 2022.
The aim of this in vitro study was to evaluate the effect of different celaning methods on the shear bond strength of the saliva contaminated zirconia. The 120 zirconia specimens (7x7x3 mm) were fabricated and abraded with aluminum oxide. Specimens were divided into 8 groups (n=15). Group MDP were first treated with one coat of MDP primer, after then a thin coat of fresh human saliva was painted specimens. Except the control group; all specimens were contaminated saliva like MDP group’s procedure. The specimens were cleaned with Ivoclean solution, concentration of 5.25% NaOCI solution, %1 phytic acid solution, 37% phosphoric gel, air-water spray and Al2O3 additional air-abrasion. Self-adhesive resin cement was applied to all samples with the help of a standard kit. The bond strengths were measured by shear testing after thermal cycling at 5-55 C. (TC 5000) The specimen surfaces were evaluated under stereomicroscope and randomize 1 specimen of the each group was examined by SEM and EDS. Statistical evaluation of the results was made by Kruskal-wallis and Bonferroni analyzes. While air-water spray, phytic acid and phosphoric acid groups showed statistically significantly lower SBS values compared to the control group (p<0.05), no statistically significant difference was found between the Ivoclean, MDP primer, 5.25% NaOCI and Al2O3 groups with the control group. According to the EDS evaluation, phosphorus element in the phosphoric acid group, and carbon element in the phytic acid and air-water spray groups were found at higher concentrations compared to the control group. In this study, primer application containing MDP, Ivoclean paste, 5.25% NaOCI and additional blasting methods before saliva contamination were found to be successful in removing saliva contamination and obtaining high SBS values.
2022-01-01T00:00:00ZTAM KRON PREPARASYONUNDA BİTİŞ SINIRI VE YÜZEY GEOMETRİSİNİN DİJİTAL ÖLÇÜ HASSASİYETİNE ETKİSİ: İN VİTRO ÇALIŞMAGünel, Aylinhttps://hdl.handle.net/11655/271522024-03-20T07:35:22Z2022-01-01T00:00:00ZTAM KRON PREPARASYONUNDA BİTİŞ SINIRI VE YÜZEY GEOMETRİSİNİN DİJİTAL ÖLÇÜ HASSASİYETİNE ETKİSİ: İN VİTRO ÇALIŞMA
Günel, Aylin
GÜNEL A, The effect of finish line and surface geometry on digital impression accuracy in full crown preparation: An in vitro study. Hacettepe University Faculty of Dentistry, Thesis in Prosthodontics, Ankara, 2022 Different preparation designs have been reported to affect accuracy in digital impressions obtained with intraoral scanners. However, studies on the effect of the geometry of the finish line and the sharp surfaces that may occur during the preparation on the digital impression accuracy are insufficient. This study aims to examine the effect of the finish line and surface geometry on digital impression accuracy in full crown preparation. For this purpose, six prepared tooth models with three different finishing lines (shoulder, chamfer, rounded shoulder) and two different occlusal geometries (sharp and rounded) were created. In each group, a reference model was obtained using digital data from an industrial scanner (Atos II TripleScan). Models were scanned with three different intraoral scanners (iTero Element 2, Trios 4, Medit i500) (n=10). Impression accuracy was evaluated by superimposing the reference data with the digital impression data obtained from intraoral scanners by the best-fit program. R software (version 4.1.2) was used for the statistical analysis of the data. Differences between groups and scanners were analyzed using the Mann-Whitney U non-parametric test. In case of a difference between the groups, Conover paired comparison test was applied. The statistical significance level for all analyzes was accepted as p<0.05. For all intraoral scanners, models with shoulder finish lines showed higher deviation values (p<0.05). Models with sharp occlusal geometry showed higher deviation values compared to rounded ones (p<0.05). For all groups clinically acceptable digital impressions were obtained.
2022-01-01T00:00:00ZİMPLANT ÜSTÜ DİJİTAL ÖLÇÜLERDE TARAMA GÖVDELERİNDE YAPILAN MODİFİKASYONUN DİJİTAL ÖLÇÜ HASSASİYETİNE ETKİSİ: IN VITRO ÇALIŞMAUzel, Sema Mervehttps://hdl.handle.net/11655/271512024-03-18T11:33:41Z2022-01-01T00:00:00ZİMPLANT ÜSTÜ DİJİTAL ÖLÇÜLERDE TARAMA GÖVDELERİNDE YAPILAN MODİFİKASYONUN DİJİTAL ÖLÇÜ HASSASİYETİNE ETKİSİ: IN VITRO ÇALIŞMA
Uzel, Sema Merve
UZEL S.M., The Effect of Scanbody modifications on Digital Impressions on Implants on Digital Impression Accuracy: In Vitro Study. Hacettepe University, Faculty of Dentistry, Thesis in Prosthodontics , Ankara, 2022. There is not enough information in the literature on the effect of modifications made on the scanbodies used in the digital workflow of implant restorations on the impression accuracy. The aim of this study is to examine the effect of the modifications made on the digital impressions taken with different intraoral scanners on the impression accuracy. For this purpose, two implants were placed in the partial maxillary edentulous model produced by a 3D printer. In order to determine the three-dimensional position of the implants, scanning was performed with a laboratory scanner and a reference dataset was obtained. In the study, 4 groups were formed according to the modifications made to the scan bodies: Group 1; no modifications were made, Group 2; A 2x3 mm wide area was excised from the proximal surface, Group 3; A 3x4 mm wide area was excised from the proximal surface, Group 4; The 3x6 mm wide area covering part of the screw entry slot has been removed. Digital impressions were taken with three different intraoral scanners (Itero Element 2, 3shape Trios 4, Medit i500) in each group (n=10). The digital data obtained from intraoral scanners, the reference data set and the measurement precision were evaluated by using the mathematical registration algorithm program. Mann-Whitney U non-parametric statistical analysis test was used to evaluate the results. A statistically significant difference was found between the groups in both implant sites, independent of the intraoral scanner (p<0.05). While there was no significant difference between intraoral scanners in Groups 1 and 2 (p>0.05), a significant difference was found between scanners in Groups 3 and 4 (p<0.05). When the angular deviation values are examined, the statistical difference between the devices for both implant regions is not significant (p>0.05). Modifications made to the scanning bodies affect the measurement accuracy. The accuracy of intraoral scanners on the implant in partial edentulism is similar.
2022-01-01T00:00:00Zİmplant Destekli Sabit Protez Yapımında Direkt Dijital Ölçü İçin Kullanılan Farklı Tarama Postlarının Hassasiyetinin Değerlendirilmesi: Metodolojik Klinik ÇalışmaDEMİR, Fatmanurhttps://hdl.handle.net/11655/270302024-03-18T11:33:16Z2022-01-01T00:00:00Zİmplant Destekli Sabit Protez Yapımında Direkt Dijital Ölçü İçin Kullanılan Farklı Tarama Postlarının Hassasiyetinin Değerlendirilmesi: Metodolojik Klinik Çalışma
DEMİR, Fatmanur
Information with regards to effects of implant scanbody and its CAD library used in digital workflow in fabrication of implant supported restoration is not clinically evidence based. The purpose of this study was to evaluate clinically the precision of different scanbodies used for direct digitalization of implant supported restorations, and the 3D implant position recordings as well. Twenty-five patients receiving two implant supported restorations in treatment of short-span partial edentulism were enrolled into the study. Three different scanbodies, original, non-original and generic, were employed for direct digitalization using a confocal microscopy scanning intraoral scanner with image stitching algorithm. Full contour restorations were CAD/CAM fabricated from each digital record, and were evaluated in terms of implant fit, axial- and occlusal-contact. Additionally, patients’ impressions for digitalization and delivery procedures were recorded using a visual analog scale. Scanbody scan recordings were subjected to reverse engineering for analytical evaluation of 3D virtual implant positioning. All restorations presented passive fit in connection to supporting implants, differences in relation with regards to contact both in occlusion to antagonist and axial to neighbor tooth were statistically insignificant. (p>0.05) Patients defined intraoral scanner use as low in anxiety, ease in practice, restoration adjustment short in time and high in comfort as well. Reverse engineering analytics of implant angulations between the implants medial and lateral to midline did not significantly differed statistically. (p>0.05) Differences in scan post properties did not have an effect on direct digitalization of implants towards to clinical accuracy of short fixed partial dentures, and 3D implant position recording as well.
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