Marwa Ahmed Abuoelezz

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Research Title :Effect of two different digital construction techniques of mandibular implant-assisted overdentures on peri-implant bone loss and posterior ridge resorption: a 3-year prospective randomized clinical trial

Authors :Nermeen El Sayed El Khamisy, Radwa Mohsen Kamal Emera, Thuraya Maher Elmanci, Marwa Ahmed Mohamed Abdel Rahman Aboelez

Abstract :Objectives Traditional complete denture (CD) design and fabrication techniques need several clinical and laboratory steps. To improve the qualities of denture base material and get rid of all the problems that come with the conventional fabrication process, novel production methods were approved. In the field of denture manufacture, new materials and computer-aided technology have been explored as potential solutions. So, this study aimed to investigate the effect of two different digital construction techniques of implant-assisted overdentures on peri-implant and posterior mandibular bone resorptions by CBCT. Materials and methods Twenty patients who received mandibular overdenture constructed by different construction techniques were classified equally and randomly into two groups (n = 10 per group): Group M: received milled mandibular overdenture opposed by maxillary complete denture. Group P: received 3D-printed mandibular overdenture opposed by maxillary complete denture. Peri-implant bone loss and posterior ridge resorption were assessed at baseline (T0), at 1 year(T1), and 3 years(T3) by superimposition of pre and post-treatment CBCT.The Shapiro-Wilk test was used to access data that was not normally distributed. Two distinct groups were compared using the Mann-Whitney test. The Wilcoxon signed-rank test was used to compare paired groups. Results Regarding vertical bone loss(VBL), Group P recorded higher VBL in comparison to Group M, where the mean was 0.57 ± 0.13, and 0.52 ± 0.12respectively, at T1 and 0.66 ± 0.11, 0.60 ± 0.12 at T3. There was a statistically significant difference at different times of evaluation within the groups where (P < 0.001). Regarding posterior ridge resorption(PRR), Group P recorded higher PRR in comparison to Group M, where the mean was 381 ± 18.5, 333 ± 17.2 respectively at T1and 533 ± 24.9, 478.5 ± 12.3 at T3. There was a statistically significant difference at different times of evaluation within the groups where (P = 0.005). Conclusion Regarding the preservation of peri-implant alveolar bone and posterior ridge bone, milled implant-assisted complete overdentures may have more favorable clinical outcomes compared to 3D printed implant overdentures in the digitally constructed mandibular overdenture bases retained by two implants. Clinical relevance Both milled and 3D printed implant overdenture impression techniques can be used for the construction of CAD/CAM-implant retained overdenture base. However, in regarding the peri-implant alveolar bone and posterior ridge bone resorption, milled implant-assisted complete overdentures may have more favorable clinical outcomes compared to 3D printed implant overdentures retained by two implants. Clinical trial registry number (No.-NCT06720389) (03/12/2024).

Keywords :Milled denture base, 3D-printing denture base, Posterior ridge resorption, Vertical bone los

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Research Title :Efficiency of different treatment modalities on radiation induced trismus for maxillofacial cases: a parallel randomized clinical trial

Authors : Marwa Ahmed Mohamed Abdel Rahman Aboelez, Abdallah Mohammed Ibrahim, Mohammed A. El-Sawy, Nermeen El sayed El-Khamisy

Abstract :Background For more than 80% of patients with head and neck cancer, radiation therapy (RT) is a crucial component of their treatment plane which causes impairment for the masticatory apparatus functions leading to trismus. The study objective was to compare the efficacy of different treatment modalities for patients with RT-induced trismus on maximum mouth opening (MMO), visual analogue scale (VAS) (primary outcomes) patient satisfaction (secondary outcome). Methods Thirty-six patients with trismus after radiation therapy were classified equally and randomly into three groups (n = 12 per group): Group A was given threaded tapered screw appliance therapy (TTSA), Group B was given low-level laser therapy (LLLT), and Group C was given both threaded tapered screw appliance and low-level laser therapy (LLLT + TTSA). Maximum mouth opening (MMO), visual analogue scale (VAS) and Gothenburg Trismus Questionnaire (GTQ) scores and time required to achieve normal state were evaluated at baseline, 1, 2, 4 weeks, 3 and 6 months after the intervention. Data were collected and analysed using SPSS software. Results Regarding VAS and MMO, there was a statistically significant difference at different times of evaluation within all groups where (P <.0001). Regarding GTQ, group C recorded the least values for GTQ symptoms followed by group B followed by group A. Between groups A, B, and C at six months, there was a statistically significant difference for VAS. At three and six months, there was a statistically significant difference between all groups for MMO. At three and six months, there was a statistically significant difference between groups for all GTQ domains. Conclusion All available therapy modalities have the potential to effectively improve radiation induced trismus; however, the combination of TTSA and LLLT group appears to yield the most rapid and optimal enhancement. Clinical Trial Registry Number (NCT06413628) (05/12/2024) Retrospectively registered

Keywords : Low-level laser, Radiation therapy, Threaded tapered screw appliance, Trismus

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Research Title :Clinical and Radiographic Outcome Short-span Fixed Partial Dentures Supported by 2 Immediately Placed Implants in the Anterior Mandible: A Long-term Retrospective Analysis

Authors : Mohammed A. El-Sawy, Hazem M Abd El-Aziz, Marwa Ahmed Mohamed Abdel Rahman Aboelez, Mohamed T Khater

Abstract :Objective: To report the implant survival rates, clinical, and radiographic outcomes following a duration of over five years in the function of 2 immediately placed implants supported by a short-span fixed partial denture (FPD) in the anterior mandible. Materials and methods: 100 individuals with immediately placed 2 implants (n=200) to support a 4-unit FPD in the lateral incisor's region of the mandible for long-term functional life with different loading protocols were chosen for this research. The participants were divided into 3 groups according to loading protocol after implant placement. Plaque index (PI), bleeding on probing (BOP), probing depth (PD), radiographic crestal bone level (CBL) and implant survival rate were evaluated. Results: Three implants failed out of 200. Seven years was the average years that the implants were in function, and the overall survival rate was 98.5%. The mean PI was 24.86 in group I, 24.45 in group ΙΙ, and 24.77 in group ΙΙΙ. Group Λ had a mean BOP of 29.48, group ΙΙ had a mean BOP of 29.03, and group ΙΙΙ had a mean BOP of 29.12. For group Ι, the mean PD was 2.03; for group ΙΙ, it was 2.09; and for group ΙΙΙ, it was 2.11. For group Ι, the mean radiographic CBL was 1.69; for group ΙΙ, it was 1.56; and for group ΙΙΙ, it was 1.57. There was no significant difference among the 3 groups regarding PI, BOP, PD, CBL, and implant survival. Conclusions: Within the limitations of this retrospective study, immediate loading protocol of immediately placed dental implants in the mandibular lateral incisor's region is a reliable dental rehabilitation choice and represents a valid alternative to the traditional delayed loading rehabilitation. Clinical significance: Immediate implant placement and immediate loading protocol can be advantageous for both patients and physicians. It can save costs and treatment times, and it might be a good alternative for patients who have high aesthetic standards for their anterior mandible.

Keywords :Fixed Partial Dentures, Anterior Mandible, implant survival rates

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Research Title :A Clinical and Radiographic 3 Years Retrospective Study for Two Types of Locator Retained Mandibular Implant Overdenture

Authors :Christine Raouf, Marwa Ahmed Mohamed Abdel Rahman Aboelez, Ayman Elkashty, Heba Nabil Awad

Abstract :Introduction This retrospective study aimed to evaluate peri‐implant marginal bone loss (MBL) and prosthetic complications between two types of locator attachments in two implant‐supported mandibular overdentures. Material and Method From the archived records, information about patients who had two implants inserted utilizing two different types of locator attachments into the interforaminal region between November 2019 and December 2023 was obtained. Overall, 60 patients (Total = 120 implants) from the archive records of the Prosthodontics Department, Faculty of Dentistry, Mansoura University, with ages ranging from 40 to 60 (mean age 50), were included in the study. Group I (control): Overall, 30 patients who would be delivered mandibular implant overdenture using conventional locator attachments. Group II (study): Overall, 30 patients who would be delivered mandibular implant overdenture using RTx locator attachments. After the placement of the mandibular overdenture (T0), 6 months (T6), 12 months (T12), and 3 years (T3) later, the marginal bone loss (MBL) was assessed. Prosthetic complications were evaluated for both groups 3 years after prosthetic delivery. Result A statistically significant increase ( p = 0.000) was found in MBL scores at all observation times between both groups. Group II showed a statistical increase in MBL than Group I. For prosthetic complications, no significant difference was found between both groups. Group II showed more matrix wear than Group I however, it was not statistically significant ( p = 0.60). Conclusion Within the limitation of this study, we can conclude the following: Both types of locator attachment (conventional and RTx locator) can be used clinically with no preference concerning the frequency of prosthetic complications. From the MBL perspective, conventional locators are more favorable than RTx locators.

Keywords : implant‐supported mandibular overdentures, locator attachments, Prosthetic complications

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Research Title :Comparison of Direct Intraoral Scan and Traditional Impression for CAD/CAM Mandibular Overdenture Base: RCT on Peri-implant Marginal Bone Changes

Authors :Ahmed Seifeldien, Marwa Ahmed Mohamed Abdel Rahman Aboelez, Ashraf Gebreel, Mohammed M Fouad

Abstract :Aim This study aimed to evaluate the impact of digital vs traditional impression techniques on peri-implant vertical bone resorption in the creation of mandibular overdenture bases supported by four implants using CAD/CAM technology. Materials and methods Twenty edentulous patients were placed in four mandibular implants and randomly divided into groups: (A) the control group (CIG) (n = 10); patients obtained CAD/CAM denture base using conventional impression technique and group (B) the study (DIG) group (n = 10); patients obtained CAD/CAM denture base using digital impression technique. Peri-implant vertical bone height was measured immediately (T0), 6 (T6), and 12 (T12) months after insertion. Peri-implant vertical bone loss (VBL) was calculated first 6 months (T1), the second 6 months (T2), and 1 year (T3) after insertion. Results For both groups, the survival rates of inserted implants were 100%. The amount of VBL in the first year in both groups was within normal ranges. In both groups, VBL significantly decreased over time. The control group recorded significantly higher VBL than (DIG) group at T2 (p = 0.006) and at T3 (p = 0.005). Conclusion Digital intraoral scanning technique may be considered a more beneficial registration method than traditional impression technique for the construction of CAD/CAM 4-implant-assisted overdenture base regarding the preservation of vertical bone levels. Clinical significance Both digital intraoral scanners and conventional impression techniques can be used for the construction of CAD/CAM-implant-assisted overdenture bases regarding the preservation of peri-implant vertical bone resorption. How to cite this article Seifeldeen AR, Aboelez MA, Gebreel AA, et al. Comparison of Direct Intraoral Scan and Traditional Impression for CAD/CAM Mandibular Overdenture Base: RCT on Peri-implant Marginal Bone Changes. J Contemp Dent Pract 2024;25(6):527–534.

Keywords :Bone height changes, CAD/CAM denture base, Digital impression, Implant impression technique, Implant overdenture

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Research Title :Predicting maximum occlusal force and tongue pressure using decision tree analysis in patients diagnosed with head and neck tumors

Authors : Ziyi Bai,Xuewei Han,Yuka I Sumita ,Mariko Hattori,Kosuke Maki ,Marwa Ahmed Mohamed Abdel Rahman Aboelez,Noriyuki Wakabayashi

Abstract :

Keywords : occlusal force, tongue pressure, decision tree, with head and neck tumors

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Research Title :Assessment of the color stability of two silicone elastomers for maxillofacial prostheses upon exposure to cold beverages

Authors :Anshul Chugh, Mariko Hattori, Marwa Ahmed Mohamed Abdel Rahman Aboelez, Noriyuki Wakabayashi

Abstract :Purpose: This study investigated the color stability of different commercially available silicone materials for facial prostheses upon exposure to everyday beverages. It was hypothesized that the beverages would not alter the color of the silicone under conditions simulating daily exposure. Methods: Sixty specimens were fabricated using two materials – VST-50 and Silfy – and exposed to commercially available cold mineral water, tea, or coffee. Specimen color was evaluated on days 1 and 15. The color was measured with a spectrophotometer based on CIELab system and color differences were calculated as ΔE. Statistical analysis was performed using the Kruskal-Wallis test and Mann-Whitney U test. Results: The mean ΔE values after 15 days of exposure to mineral water, cold green tea, and coffee were 1.016, 3.480, and 3.636 for VST-50 and 0.440, 0.798, and 1.425 for Silfy, respectively. Both materials showed significant differences in color, and VST-50 showed a greater color change than Silfy, especially for coffee. Conclusion: Pigmented silicone elastomers have low color stability, leading to an overall color change in silicone prostheses when exposed to pigmented beverages. Color changes in such prostheses can be mitigated by selecting materials with better color stability to extend their longevity.

Keywords :color stability, everyday beverages, maxillofacial prosthesis, silicone elastomers

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Research Title :Effect of Wearing a Maxillofacial Prosthesis on Masticatory Rhythm Improvement in Mandibulectomy Patients

Authors :Xuewei Han, Mihoko Haraguchi, Yuka I Sumita, Marwa Ahmed Mohamed Abdel Rahman Aboelez

Abstract :

Keywords :Maxillofacial Prosthesis, Masticatory Rhythm, Mandibulectomy

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Research Title :Vertical versus angled immediately loaded implants for assisting maxillary overdentures with locator attachments: A preliminary results of one-year randomized clinical trial

Authors : Marwa Ahmed Mohamed Abdel Rahman Aboelez, Christine Raouf, Mohamad Hossam El-Din Helmy, Moustafa Elsyad

Abstract :Objectives This study aimed to evaluate the clinical outcomes and patient satisfaction of 4‐implant‐assisted maxillary overdentures using two different designs. Materials and Methods Thirty edentulous participants received four implants in the maxillary ridge. The patients were randomly divided into two equal groups: (1) the control (CG, Vertical) group ( n = 15); participants received four vertical implants with straight locator attachments to retain maxillary overdentures, and (2) the study (SG, Angled) group ( n = 15); participants received four angled implants with angled locator attachments to retain maxillary overdentures. Peri‐implant tissue health [Plaque (PL) and gingival (GI) indices, pocket depth (PD), implant stability (ISQ) and crestal bone loss (CBL)] were evaluated after denture insertion (T0), 6 (T6), and 12 (T12) months after insertion. Patient satisfaction was evaluated using a visual analog scale (VAS) after 12 months. Results The survival rates were 96.7% and 95% for the control and study groups respectively. PL, GI, and PD increased significantly in both groups with the passage of time. No significant difference in PL, GI, PD, and ISQ was noted between groups at all observation times. CG showed higher CBL than SG at T12. For the VAS results, there was no significant difference between groups. SG recorded significantly higher satisfaction regarding comfort with maxillary and mandibular dentures, retention of mandibular dentures, oral hygiene, the ability to chew hard food, and occlusion than CG. Conclusion Within the limitations of this study, angled implants with angled locator attachments may be recommended to retain maxillary overdentures opposing intact dentition or fixed restoration as it was associated with improvements of several parameters of peri‐implant tissue health and patient satisfaction compared to vertical implants with straight locator attachments.

Keywords :angled implants, maxillary, overdenture, patient satisfaction, peri-implant tissue health

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Research Title :Efficacy of stabilization splint and low level laser therapy for patients with chronic closed lock from non‐reducible displaced temporo‐mandibular joint discs. A parallel randomized clinical trial

Authors :Noha Hosny, Aisha Zakaria Mostafa, Marwa Ahmed Mohamed Abdel Rahman Aboelez

Abstract :Background: Stabilization splint therapy (SST) and low level laser therapy (LLLT) are effective non-invasive treatment for temporo-mandibular disorder (TMD) patients. However, the specific efficacy of each therapy in patients with chronic closed lock (CCL) from temporo-mandibular joints (TMJ) disc displacement without reduction (DDwoR) remains unknown. Aim: To assess and compare the efficacy of SST and LLLT alone or in combination in patients with CCL from TMJ DDwoR . Methods: This parallel randomized clinical trial included 42 patients who were diagnosed with CCL from TMJ DDwoR. Patients were allocated equally and randomly into three treatment groups: group I received combined SST and LLLT, group II received LLLT and group III received SST. Maximum mouth opening (MMO), visual analogue scale (VAS), muscle and joint palpation scores, and time required to achieve normal state, were evaluated at baseline, one week, two weeks, four weeks, three months, and six months after the intervention. Data was collected and analyzed using SPSS software. Results: Regarding MMO and VAS, a statistically significant improvement was found between group I versus group II and versus group III at all evaluation times. Regarding muscle and joint palpation scores, a statistically significant difference was found between group I versus group III, while non-significant difference was found between group I and group II. A statistically significant faster improvement was found in group I versus group III and versus group II. Conclusion: All treatment modalities can be effective in management of CCL from a TMJ DDwoR cases but the combined SST and LLLT group seems to provide the best and quickest improvement.

Keywords :closed lock, low- level laser, stabilisation splint, temporo- mandibular join

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Research Title :Angled ball and locator attachments for immediate loaded inclined implants used to retain maxillary overdentures: A cross over study of patient satisfaction and oral health related quality of life

Authors :Marwa Ahmed Mohamed Abdel Rahman Aboelez, Mona Galal Abo Elezz, Abdelrahman Elsaid Abdraboh, Moustafa Elsyad

Abstract :Background: Objectives: The aim of this was to compare the influence of two different angulated abutment designs on patient satisfaction, oral health-related quality of life, and prosthetic aspects of implant-supported maxillary overdentures. Materials and methods: For this cross-over study, 18 patients with completely edentulous maxillary ridges opposing implant-retained mandibular overdentures received 4 implants between the maxillary sinuses using computer-guided surgery. The anterior implants were installed at canine/lateral incisor areas and inclined 15° labially. The posterior implants were inserted just anterior to the maxillary sinuses and inclined 15o distally. Eight patients received maxillary overdentures retained by angled ball attachment (ball overdenture [BOD]) and angled locator attachment in random order. After 6 months, patients indicated satisfaction with their prosthesis using a visual analog scale (VAS), and oral health impact profile (OHIP-14). Moreover, postinsertion prosthodontic maintenance and complications were recorded for both attachments. Comparisons of patient satisfaction and prosthetic complications between groups were performed using the Wilcoxon matched-pairs test and the McNemar test, respectively. Results: Locator overdenture (LOD) recorded significantly higher scores than the BOD group regarding all the VAS questions except for ease of cleaning (p < 0.007). LOD recorded significantly higher patient satisfaction regarding the pronunciation of sounds (p = 0.009), painful aching (p = 0.018), feeling tense (p = 0.011), unsatisfactory diet (p = 0.013), irritability with people (p = 0.005), and life in general (p = 0.004). The most common complications were matrix activation/renewal (n = 34). BOD showed a significantly higher incidence of attachment loosening (p = 0.002), and teeth fracture (p = 0.049) than LOD. LOD showed a significantly higher incidence of attachment wear and replacement than BOD (p <0.001). There was no difference between groups regarding soft tissue complications. Conclusion: Within the limitations of this study, and in terms of improved patient-centered outcomes, angled locator attachments are recommended to retain maxillary implant overdentures opposed by implant retained mandibular overdentures at it was associated with increased patient satisfaction and oral health-related quality of life than angled ball attachments. However, locator attachment was associated with more postinsertion prosthodont

Keywords :locator attachment, ball attachments , inclined implants

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Research Title :Triangular mesh reduction of digitized maxillectomy defects for prosthetic rehabilitation: A 3D deviation study

Authors :Mahmoud E Elbashti, Amel Aswehlee, Marwa Ahmed Mohamed Abdel Rahman Aboelez, Pedro Molinero-Mourelle, Martin Schimmel

Abstract :Objectives To evaluate the effect of different amounts of triangular mesh reduction on the trueness of digitized complete-arch dentate and edentulous maxillectomy defects models. Material and Methods Twenty gypsum maxillectomy defect models (dentate and edentate group: n=10) were digitized using the Trios 3 intraoral scanner, scanning the teeth, mucosa and maxillectomy defect. These datasets (reference, R0) were saved as standard tessellation language (STL) files, and triangular mesh reduction was performed using Meshmixer's reduction tool. Digital test-datasets with file sizes reduced by 50%(R1), 75%(R2), and 90%(R3) were generated (each: n=20). Each test-dataset was compared to the R0 file using 3D evaluation software (GOM Inspect), applying automated pre-alignment followed by a global best-fit alignment, and root mean square (RMS) 3-dimensional (3D) deviations were calculated. Statistical analyses were performed, at a level of significance of α=0.05. Results The number of triangles, and STL file size were synchronized with each other and inversely proportional to the amount of mesh reduction. The resulting mean percentages of the STL file sizes were 50.00% for R1, 24.93% for R2, and 10.00% for R3. There were no 3D deviations at 50% triangular mesh reduction. The 3D deviations increased with the amount of mesh reduction: at 75% reduction the median deviations were lower (dentate:0.0016mm, IQR:0.0015-0.0018; edentate:0.0016mm, IQR:0.0015-0.0016), than at 90% (dentate:0.004mm, IQR:0.0038-0.0041; edentate:0.003mm, IQR:0.0036-0.0039). A statistically significant increase in 3D deviations was observed with higher degrees of mesh reduction (p<0.001). Conclusions Triangular mesh reduction results in a significant increase in 3D deviations if the reduction is more than 75%. Clinical Significance Digital models of patients with maxillectomy defects can be saved with a mesh reduction of 50% without affecting the trueness. The use of a 50% m

Keywords : maxillectomy defects, scanners, digital evaluation, truness

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Research Title :Comparing two different angulated abutment designs on marginal bone loss around divergent two implants retaining mandibular overdentures: A radiographic prospective study.

Authors :Marwa Ahmed Mohamed Abdel Rahman Aboelez

Abstract :Objectives: the aim of this study was to radiographically compare the inuence of two different angulated abutment designs on marginal bone loss around 30-degree divergent two implants retaining mandibular overdentures. Materials and Methods: Thirty six patients were selected. For each patient, two distally inclined dental implants (3.5 mm × 13 mm) were bilaterally inserted in the canine regions by using stereolithography stent. Patients were divided into two groups as follows: Group AB (n=18) : Patients received two ball attachments which were screwed to the angulated overdenture abutments. Group AL (n = 18): Patients received two locator attachments which were screwed to the angled overdenture abutments. Marginal bone loss was assessed at the time of implant insertion (baseline), and after every 12 months up to 36 months by using digital periapical radiographs. Results: Both groups showed insignicant difference at the mesial aspect in peri- implant bone loss at 12 months. But, ball group recorded a signicant increase in peri-implant bone loss (0.26)) in comparison to locator group (0.23). But, at the distal aspect there was a statistically insignicant difference between both groups at 12, 24 and 36 months Conclusion: The locator attachment can be considered more favorable than the ball attachments regarding the peri-implant bone loss around 15 distally inclined implants used for assisting mandibular complete over denture.

Keywords : Mandibular implant overdenture, Angled abutment and peri-implant bone los

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