This in vitro study evaluated the influence of restoration design (bi-layered vs. monolithic) and... more This in vitro study evaluated the influence of restoration design (bi-layered vs. monolithic) and manufacturing technique on the marginal discrepancy and internal fit of 3-unit zirconia fixed dental prostheses (FDPs). Mandibular second premolars and second molars were prepared as abutments in a 3-unit zirconia bridge to develop four groups (n = 10 FDPs): MZ: Monolithic zirconia FDPs, ZL: zirconia framework veneered by the hand-layering technique, ZP: zirconia framework veneered by the heat-pressed technique, and CAD-on: zirconia framework veneered by CAD/CAM lithium-disilicate glass–ceramic. All the zirconia FDPs were cemented to their corresponding die replicas using dual-cure resin cement and were subjected to compressive cyclic loading at a load range for half a million cycles using a universal testing machine. FDPs were sectioned mesiodistally to measure the marginal gap and internal fit using scanning electron microscopy. The measurements were taken at pre-assigned points of ea...
Purpose: To evaluate the effect of restoration design on fracture resistance and stress distribut... more Purpose: To evaluate the effect of restoration design on fracture resistance and stress distribution of veneered and monolithic 3-unit zirconia fixed partial dentures (FDPs) using finite element analysis (FEA). Materials and methods: Identical epoxy resin replicas of mandibular second premolar and second molar (to serve as abutment for the 3-unit bridge) were divided into four groups (n = 10): monolithic zirconia (MZ) restorations; conventional layering veneering technique (ZL), heat-pressed technique (ZP), or CAD/CAM lithium disilicate glass ceramic (CAD-on). Specimens were subjected to compressive cyclic loading on the mesio-buccal cusp of the pontic (load range 50 to 600 N; aqueous environment; 500,000 cycles) in a universal testing machine. Data were statistically analyzed at 5% significance level with Fisher exact test and Kaplan-Meier survival analysis. 3D models were constructed in accordance with experimental groups. The stress distribution in each model was analyzed and evaluated according to the location and magnitude of the maximum principal stresses (MPS) using ANSYS software. Results: Specimens from ZL and ZP groups failed at different stages of the 500,000 cycles fatigue, while CAD-on and MZ restorations survived fatigue test. Statistically, there was a significant difference between the groups (P < .001). The MPS were located under the mesial connector in both monolithic and bilayered 3-unit zirconia FDPs. These stresses were found to be higher in monolithic geometries compared to bilayered zirconia FDPs. Conclusion: Monolithic 3-unit zirconia and CAD-on zirconia frameworks resulted in superior fracture resistance. Restoration design significantly affected the stress distribution of 3-unit zirconia FDPs.
The study compared the fitness accuracy of digitally produced removable partial denture framework... more The study compared the fitness accuracy of digitally produced removable partial denture frameworks using 3D printing selective laser melting technology. Three groups were fabricated; the first group where the frameworks were produced digitally through digital designing and then the frameworks were printed by selective laser melting additive manufacturing (3DP-G1). The second frameworks groups were produced by the lost wax/casting method (C-G2) and the third group was produced by scanning wax-up of the framework and then printed as in the first group (SP-G3). A total of 6 frameworks were produced from each group. Micro-CT images were used to investigate spaces under the frameworks seated on the master casts at five specified locations. Finally, spaces at the same locations were measured by using light-body polyvinyl siloxane impression materials. There was no significant difference among the spaces calculated underneath the 18 frameworks for the three various groups at a significance...
Biomaterials and tissue engineering scaffolds play a central role to repair bone defects. Althoug... more Biomaterials and tissue engineering scaffolds play a central role to repair bone defects. Although ceramic derivatives have been historically used to repair bone, hybrid materials have emerged as viable alternatives. The rationale for hybrid bone biomaterials is to recapitulate the native bone composition to which these materials are intended to replace. In addition to the mechanical and dimensional stability, bone repair scaffolds are needed to provide suitable microenvironments for cells. Therefore, scaffolds serve more than a mere structural template suggesting a need for better and interactive biomaterials. In this review article, we aim to provide a summary of the current materials used in bone tissue engineering. Due to the ever-increasing scientific publications on this topic, this review cannot be exhaustive; however, we attempted to provide readers with the latest advance without being redundant. Furthermore, every attempt is made to ensure that seminal works and significan...
Objectives: To develop and validate a method for application of the Osstell ISQ device in the ass... more Objectives: To develop and validate a method for application of the Osstell ISQ device in the assessment of mini-implant stability. Materials and Methods: An adaptor was developed for attachment of Osstell's SmartPeg onto a variety of orthodontic mini-implants. For validation of the adaptor, Benefit mini-implants were inserted into bone blocks that mimicked different stability conditions. The Osstell device was used to assess mini-implant stability with the adaptor (test measurement) and conventional SmartPeg attachment (gold-standard measurement). Implant stability quotient (ISQ) values were assessed for agreement, repeatability, and reproducibility. Results: Strong positive correlations were found between ISQ values obtained using the novel adaptor and the conventional attachment. Repeatability and reproducibility of ISQ values with the adaptor were similar to those obtained with the conventional attachment. Conclusions: A method was developed and validated to assess the stabi...
Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie, 2021
PURPOSE The aim of this study was to compare classical friction (FR) in passive self-ligating bra... more PURPOSE The aim of this study was to compare classical friction (FR) in passive self-ligating brackets (P-SLBs), active self-ligating brackets (A-SLBs) and a traditional twin bracket, in vitro, and to identify the point of initiation of bracket-archwire engagement. METHODS Nine bracket systems of 0.022 in slot size were FR tested: 5 P‑SLB systems; 4 A‑SLB systems; and a control group of twin brackets with elastomeric ligatures. Single upper right central incisor brackets were mounted on a custom metal fixture for testing. Straight sections of various round and rectangular nickel-titanium (NiTi) archwires (0.016, 0.018, 0.018 × 0.018, 0.020 × 0.020, 0.016 × 0.022, 0.017 × 0.025, 0.019 × 0.025, and 0.021 × 0.025 in) were ligated to the bracket and peak static FR (cN) was measured with an Instron Universal Testing Machine. Ten unique tests each utilizing a new bracket and new archwire were conducted for each group in the dry state. RESULTS FR was significantly different between control, P‑SLB and A‑SLB systems (P < 0.001). P‑SLB groups displayed no significant differences in FR between each other, regardless of archwire size. A‑SLB groups did exhibit significant differences in FR between each other depending on both the bracket system and archwire size. Each A‑SLB system tested possessed a distinctly different pattern of initiation of bracket-archwire engagement. CONCLUSIONS FR between the archwire and bracket slot differs between P‑SLB and A‑SLB systems, with a distinct pattern of FR and bracket-archwire engagement for each A‑SLB system. Understanding the different bracket-wire interactions of SLB systems should help orthodontic clinicians to plan effective and efficient biomechanics with the bracket system of their choice.
... Saturday, March 19, 2011: 1:45 pm-3 pm. Location: Hall C (San Diego Convention Center) Sessio... more ... Saturday, March 19, 2011: 1:45 pm-3 pm. Location: Hall C (San Diego Convention Center) Session Type: Poster ... 3223. Fracture And Flexural Strengths Of Two Alumina Based Ceramic Materials S. LOAIZA, L. ESTUPIÑAN, M. PIÑEROS, G. ARDILA, I. GARCIA, and JR ...
... Kemal Murat Okcu, DDS, PhD; Fevzi Erdemci, DDS; Aydin Gulses, DDS; Metin Sencimen, DDS, PhD. ... more ... Kemal Murat Okcu, DDS, PhD; Fevzi Erdemci, DDS; Aydin Gulses, DDS; Metin Sencimen, DDS, PhD. ... Gülhane Military Medical Academy, Department of oral and maxillofacial surgery, GeneralTevfik Sağlam Cad. ... 1998;8(1):61-4. Kusgoz A, Yildirim T, Kayipmaz S, Saricaoglu S ...
This in vitro study evaluated the influence of restoration design (bi-layered vs. monolithic) and... more This in vitro study evaluated the influence of restoration design (bi-layered vs. monolithic) and manufacturing technique on the marginal discrepancy and internal fit of 3-unit zirconia fixed dental prostheses (FDPs). Mandibular second premolars and second molars were prepared as abutments in a 3-unit zirconia bridge to develop four groups (n = 10 FDPs): MZ: Monolithic zirconia FDPs, ZL: zirconia framework veneered by the hand-layering technique, ZP: zirconia framework veneered by the heat-pressed technique, and CAD-on: zirconia framework veneered by CAD/CAM lithium-disilicate glass–ceramic. All the zirconia FDPs were cemented to their corresponding die replicas using dual-cure resin cement and were subjected to compressive cyclic loading at a load range for half a million cycles using a universal testing machine. FDPs were sectioned mesiodistally to measure the marginal gap and internal fit using scanning electron microscopy. The measurements were taken at pre-assigned points of ea...
Purpose: To evaluate the effect of restoration design on fracture resistance and stress distribut... more Purpose: To evaluate the effect of restoration design on fracture resistance and stress distribution of veneered and monolithic 3-unit zirconia fixed partial dentures (FDPs) using finite element analysis (FEA). Materials and methods: Identical epoxy resin replicas of mandibular second premolar and second molar (to serve as abutment for the 3-unit bridge) were divided into four groups (n = 10): monolithic zirconia (MZ) restorations; conventional layering veneering technique (ZL), heat-pressed technique (ZP), or CAD/CAM lithium disilicate glass ceramic (CAD-on). Specimens were subjected to compressive cyclic loading on the mesio-buccal cusp of the pontic (load range 50 to 600 N; aqueous environment; 500,000 cycles) in a universal testing machine. Data were statistically analyzed at 5% significance level with Fisher exact test and Kaplan-Meier survival analysis. 3D models were constructed in accordance with experimental groups. The stress distribution in each model was analyzed and evaluated according to the location and magnitude of the maximum principal stresses (MPS) using ANSYS software. Results: Specimens from ZL and ZP groups failed at different stages of the 500,000 cycles fatigue, while CAD-on and MZ restorations survived fatigue test. Statistically, there was a significant difference between the groups (P < .001). The MPS were located under the mesial connector in both monolithic and bilayered 3-unit zirconia FDPs. These stresses were found to be higher in monolithic geometries compared to bilayered zirconia FDPs. Conclusion: Monolithic 3-unit zirconia and CAD-on zirconia frameworks resulted in superior fracture resistance. Restoration design significantly affected the stress distribution of 3-unit zirconia FDPs.
The study compared the fitness accuracy of digitally produced removable partial denture framework... more The study compared the fitness accuracy of digitally produced removable partial denture frameworks using 3D printing selective laser melting technology. Three groups were fabricated; the first group where the frameworks were produced digitally through digital designing and then the frameworks were printed by selective laser melting additive manufacturing (3DP-G1). The second frameworks groups were produced by the lost wax/casting method (C-G2) and the third group was produced by scanning wax-up of the framework and then printed as in the first group (SP-G3). A total of 6 frameworks were produced from each group. Micro-CT images were used to investigate spaces under the frameworks seated on the master casts at five specified locations. Finally, spaces at the same locations were measured by using light-body polyvinyl siloxane impression materials. There was no significant difference among the spaces calculated underneath the 18 frameworks for the three various groups at a significance...
Biomaterials and tissue engineering scaffolds play a central role to repair bone defects. Althoug... more Biomaterials and tissue engineering scaffolds play a central role to repair bone defects. Although ceramic derivatives have been historically used to repair bone, hybrid materials have emerged as viable alternatives. The rationale for hybrid bone biomaterials is to recapitulate the native bone composition to which these materials are intended to replace. In addition to the mechanical and dimensional stability, bone repair scaffolds are needed to provide suitable microenvironments for cells. Therefore, scaffolds serve more than a mere structural template suggesting a need for better and interactive biomaterials. In this review article, we aim to provide a summary of the current materials used in bone tissue engineering. Due to the ever-increasing scientific publications on this topic, this review cannot be exhaustive; however, we attempted to provide readers with the latest advance without being redundant. Furthermore, every attempt is made to ensure that seminal works and significan...
Objectives: To develop and validate a method for application of the Osstell ISQ device in the ass... more Objectives: To develop and validate a method for application of the Osstell ISQ device in the assessment of mini-implant stability. Materials and Methods: An adaptor was developed for attachment of Osstell's SmartPeg onto a variety of orthodontic mini-implants. For validation of the adaptor, Benefit mini-implants were inserted into bone blocks that mimicked different stability conditions. The Osstell device was used to assess mini-implant stability with the adaptor (test measurement) and conventional SmartPeg attachment (gold-standard measurement). Implant stability quotient (ISQ) values were assessed for agreement, repeatability, and reproducibility. Results: Strong positive correlations were found between ISQ values obtained using the novel adaptor and the conventional attachment. Repeatability and reproducibility of ISQ values with the adaptor were similar to those obtained with the conventional attachment. Conclusions: A method was developed and validated to assess the stabi...
Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie, 2021
PURPOSE The aim of this study was to compare classical friction (FR) in passive self-ligating bra... more PURPOSE The aim of this study was to compare classical friction (FR) in passive self-ligating brackets (P-SLBs), active self-ligating brackets (A-SLBs) and a traditional twin bracket, in vitro, and to identify the point of initiation of bracket-archwire engagement. METHODS Nine bracket systems of 0.022 in slot size were FR tested: 5 P‑SLB systems; 4 A‑SLB systems; and a control group of twin brackets with elastomeric ligatures. Single upper right central incisor brackets were mounted on a custom metal fixture for testing. Straight sections of various round and rectangular nickel-titanium (NiTi) archwires (0.016, 0.018, 0.018 × 0.018, 0.020 × 0.020, 0.016 × 0.022, 0.017 × 0.025, 0.019 × 0.025, and 0.021 × 0.025 in) were ligated to the bracket and peak static FR (cN) was measured with an Instron Universal Testing Machine. Ten unique tests each utilizing a new bracket and new archwire were conducted for each group in the dry state. RESULTS FR was significantly different between control, P‑SLB and A‑SLB systems (P < 0.001). P‑SLB groups displayed no significant differences in FR between each other, regardless of archwire size. A‑SLB groups did exhibit significant differences in FR between each other depending on both the bracket system and archwire size. Each A‑SLB system tested possessed a distinctly different pattern of initiation of bracket-archwire engagement. CONCLUSIONS FR between the archwire and bracket slot differs between P‑SLB and A‑SLB systems, with a distinct pattern of FR and bracket-archwire engagement for each A‑SLB system. Understanding the different bracket-wire interactions of SLB systems should help orthodontic clinicians to plan effective and efficient biomechanics with the bracket system of their choice.
... Saturday, March 19, 2011: 1:45 pm-3 pm. Location: Hall C (San Diego Convention Center) Sessio... more ... Saturday, March 19, 2011: 1:45 pm-3 pm. Location: Hall C (San Diego Convention Center) Session Type: Poster ... 3223. Fracture And Flexural Strengths Of Two Alumina Based Ceramic Materials S. LOAIZA, L. ESTUPIÑAN, M. PIÑEROS, G. ARDILA, I. GARCIA, and JR ...
... Kemal Murat Okcu, DDS, PhD; Fevzi Erdemci, DDS; Aydin Gulses, DDS; Metin Sencimen, DDS, PhD. ... more ... Kemal Murat Okcu, DDS, PhD; Fevzi Erdemci, DDS; Aydin Gulses, DDS; Metin Sencimen, DDS, PhD. ... Gülhane Military Medical Academy, Department of oral and maxillofacial surgery, GeneralTevfik Sağlam Cad. ... 1998;8(1):61-4. Kusgoz A, Yildirim T, Kayipmaz S, Saricaoglu S ...
Uploads