Dentistry Commons^™

The Effect Of Preparation Design And Thermal Cycling On The Marginal Accuracy Of Hybrid Ceramic Laminate Veneers, Esraa El Bably, Ossama Saleh Abdelghany, Mostafa Aboushahba, Shereen Ahmed Nossair

Future Dental Journal

Aim: This study investigated the effect of preparation design and thermal cycling on the marginal accuracy of hybrid ceramic laminate veneers. Materials and Methods: A total of twenty 3D printed dies of central incisors prepared with 2 preparation designs; butt joint and palatal wrap design were fabricated. Each type of preparation was assigned into 2 subgroups (n=5/each subgroup) according to the type of material used for fabrication of the laminate veneer; hybrid ceramic and lithium disilicate (served as control). Marginal discrepancy was evaluated using a digital microscope before and after thermocycling. Results: Statistically analysis of marginal gaps revealed that before …

Measuring Accuracy Of Dolphin Imaging Software In Predicting Upper Jaw Soft Tissue Profile Changes In Class Ii Adult Patients Treated With Extraction Versus Non-Extraction., Amr Amin Arif, Esam Nasef, Amira Aboalnaga

Future Dental Journal

Abstract

Objective: To assess the accuracy of Dolphin Imaging software in predicting upper jaw profile changes in class II patients treated by extraction and non-extraction.

Methods: The records of 60 Class II div 1 patients were selected; 30 patients treated by extraction of upper first premolar and 30 patients treated by non-extraction. The Pre- and post-treatment lateral cephalometric x-rays of each patient were traced using Dolphin software. The actual hard tissue changes due to treatment were calculated and installed into the prediction module to generate the predicted profile. The soft tissue measurements of the actual post-treatment and predicted profiles were …

Rapid Direct Wax Up For Provisional Crown Fabrication, Debra A. Woo Dds, Ma, Chi Tran

Pacific Journal of Health

While there are numerous choices for provisionalization, this technique is advantageous when a patient presents with an immediate need for temporization and there is limited time in the schedule for both the patient and provider. Providing an efficient solution using readily available materials that address the esthetics, function and reduction of sensitivity until the patient can be appointed for definitive treatment is illustrated.

Effect Of Different Implant Materials On Stresses Transmitted To Peri-Implant Areas Of Implant-Retained Mandibular Overdenture, Diaa Mohamed Zahran Future University In Egypt, Diaa.Zahran@Fue.Edu.Eg, Aya Fawzy Associate Professor Of Prosthodontics, Future University In Egypt, A.Mohamed@Fue.Edu.Eg, Salah Hegazy Professor Of Prosthodontics, Faculty Of Dentistry, Mansoura University, Salahhegazy2003@Yahoo.Com, Sara M. Shabaan Lecturer At Removable Prosthodontic Department, Faculty Of Oral And Dental Medicine , Badr University, Cairo, Egypt, Ahmed A.Elwahed Shaaban Associate Professor Of Prosthodontics, Future University In Egypt, Ahmed.Abdelwahed@Fue.Edu.Eg

Future Dental Journal

Aim this in vitro study was conducted to evaluate the effect of mechanical loading on different implant materials on supporting structures materials and methods: a total of three implant retained overdentures were used in this study, retained by two implants each (Titanium, polyetheretherketon and zirconia) were placed in epoxy resin casts at the canine area using a surgical guide. Soft liner material was used at the distal extension area to mimic the soft tissues. Two linear strain gauges were bonded buccal and lingual to each implant to measure the peri-implant strains during unilateral and bilateral loading. Results: during bilateral loading …

Effect Of Scan Body Design On The Accuracy Of The Implant Position In Implant Supported Prosthesis, Ahmed Safwat Elghazally ,Future University In Egypt, Ahmed.Elghazally@Fue.Edu.Eg, Bassem Mohsen Associate Professor Of Prosthodontics, Future University In Egypt, Bassem.Mohsen@Fue.Edu.Eg, Amr Hosny Professor Of Prosthodontics, Faculty Of Dentistry – Cairo University In Egypt, Amrelkhadem@Gmail.Com, Hussien G. Elcharkawi Professor Of Prosthodontics, Future University In Egypt, Hussen.Elsharkawi@Fue.Edu.Eg

Future Dental Journal

Background: Several treatment options are planned for completely edentulous patients rehabilitation which were developed to meet patients desires and requirements, starting from conventional complete denture till implant supported fixed full arch cases. Each technique has its own indication and limitations. Passive fit is an important factor for the long-term success of implant- prosthesis, which necessitate accurate transfer of the implant position. Recently, digital impressions have been introduced in dental implant treatment. By the use of scan body and different optical scanning methods, the position of scan bodies can be transferred to a virtual implant position within the dental arch. Material …

Creating Smiles With Digital Workflow And Matrix Transfer Technique In Customizing Personality-Based Smile Designing, Jahnavi Purna Gorripati, Surekha Godbole

International Arab Journal of Dentistry

BACKGROUND: This report is a presentation of a clinical case that follows the Visagism concept for 2D planning and, CAD (Exo CAD) for 3D desiging along 3D printed diagnostic wax-up model for closure of anterior spacing.

Case presentation: A 24-year-old man presented with midline diastema and anterior spacing 11–13, 21–23 and wants a smile designed. This concern was solved following a smile design (Visagism) planned digitally for diagnostic wax and printing a 3D model. The matrix transfer technique has been used to directly convey planned information from 3D-printed diagnostic wax-up to definitive restorations.

Conclusion: In this day and age, cosmetics …

Comparison Of The Failure Load Between Conventional Pmma And Milled Pmma Full Arch Maxillary Interim Prosthesis Fixed On 4 Implants: An In Vitro Study, Tatiana Bou Sakr, Hani Tohme, Natalia Bou Sakr, Victor Ghoubril, Carole Abi Ghosn Yared

International Arab Journal of Dentistry

The principal objective of this study was to compare the failure load between the conventional heat polymerized PMMA and the CAD/CAM milled PMMA interim full arch implant prostheses. The secondary aim was to evaluate the success of the distal extension of the temporary PMMA prosthesis.

A metallic edentulous upper arch model with 4 Straumann screw-retained abutment digital analogs was used to create 15 specimens for each of the 2 groups: Conventional and milled. Failure load was measured on 5 different regions on the left and right side of each specimen with the YLE universal testing machine:

Anterior, premolar, and molar. …

Integration Of Massive Open Online Course (Mooc) In Conventional Teaching And Learning For Fixed Prosthodontics - A Case Study, Nor Faharina Abdul Hamid, Rohana Ahmad, Tong Wah Lim, Nur Hafizah Kamar Affendi, Tengku Fazrina Tengku Mohd Ariff, Melati Mahmud, Siti Mariam Ab Ghani

Journal of Dentistry Indonesia

The potential for Massive Open Online Courses (MOOCs) in clinical dentistry remains vague and inadequately explored. Objectives: The study aims to obtain insight into the development of MOOCs in Fixed Partial Dental Prostheses (FPDPs) and to assess students’ learning preferences, module quality, and interface usability. Methods: The MOOCs was created by seven academicians with prosthodontic backgrounds. After completing the MOOCs and three complementary online discussion sessions, the students (n = 89) were invited to participate in an online survey. SPSS version 23 was used to calculate the frequency, percentage, mean, and standard deviation of categorical data (SD). Results …

Shore A Hardness And Fourier Transform Infrared Spectrophotometer Analysis Of Thymol-Modified Maxillofacial Silicone Material, Manar Hussein Ramadhan, Faiza M. Abdul-Ameer

Maaen Journal for Medical Sciences

The longevity of any prosthesis depends on the materials from which it was fabricated, which is why defects in the material properties may reduce the service life of the prosthesis and necessitate its replacement. This study aims to test the influence of incorporating different weight percentages of thymol micro-powder into the maxillofacial silicone matrix on Shore A hardness of the silicone. Room-temperature vulcanised VST-50 maxillofacial silicone was used to prepare the study specimens. Thymol micro-powder was incorporated into the silicone matrix in two percentages (0.75 wt.% and 1 wt.%). 30 specimens were prepared and then subdivided equally into three groups, …

Use Of A 3d Intraoral Scanner For Prosthetic Rehabilitation Of Cocaine-Induced Oronasal Fistula, Anita Agarwal Bds, Dmd, Mph, Timothy Levine Dmd, Victor Badner Dmd, Mph

The New York State Dental Journal

A novel method using a 3D intraoral scanner (IOS) is used to overcome difficulties in obtaining conventional impressions to fabricate an obturator for a posteriorly located oronasal fistula secondary to chronic nasal cocaine use.

The Back Page Commentary: Let’S Talk About The Real World, Danielle Gehlert Dds

The Journal of the Michigan Dental Association

Dr. Danielle Gehlert, a private practitioner, writes that in the realm of continuing education for dental professionals, there's a need for a shift in focus from idealized, "sexy" cases to real-world patient scenarios. This commentary calls for seminars and programs emphasizing long-term restorative planning, including successes and failures. The practical considerations of patient financial limitations and willingness to engage in dental care must be integral to treatment plans. Real-world cases should reflect the diverse situations dental practitioners encounter and the ethical responsibility to provide affordable and effective treatment options.

N Y State Dent J November 2023

The New York State Dental Journal

In the November 2023 issue, the reader will find the following feature articles:

• Verruciform Xanthoma
• Use of a 3D Intraoral Scanner for Prosthetic Rehabilitation of Cocaine-Induced Oronasal Fistula
• Adenoid Ameloblastoma with Dentinoid

This issue includes regular columns with regional news impacting the New York membership including: editorial and perspectives columns, legal, association activities, component news, continuing education opportunities, and classifieds.

Hollow Bulb Definitive Obturation Of A Post-Covid Mucormycosis Maxillectomy Defect – A Case Report., Ravi M B, Prakash P, Sai Pranathi Putta, Anupama Aradya, Rashmi S, Dhakshaini M R

International Journal of Health and Allied Sciences

The novel Coronavirus, also known as SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2), causes COVID-19.In the wake of COVID-19, incidences of mucormycosis were rising alarmingly, especially rhino-orbital-cerebral mucormycosis.Most cases required surgical intervention followed by the fabrication of obturators.A hollow obturator is the most practical, convenient, and cost-effective solution for prosthodontic rehabilitation. A patient with pain overthe maxillary region (left) reported to the department of Prosthodontics and Crown & Bridge. His past medical history revealed that he tested and recovered from SARS-CoV-2. Clinical, radiographic, and smear tests confirmed rhino-cerebral mucormycosis with post covid pneumonia. Surgical left partial maxillectomy performed 4 months …

Fabrication And Characterization Of Nylon 6 Fiber Via Wet Spinning Method For Application As A Reinforcing Material For A Direct Dental Bridge, Dissa Kirana Wijaya, Nina Djustiana, Yanwar Faza, Arief Cahyanto, Andri Hardiansyah

Makara Journal of Science

Nylon is a biocompatible thermoplastic polymer that is well known for its excellent fracture resistance, making it suitable for fabricating fiber-reinforced composite (FRC)-based dental bridges. FRC is widely used in dentistry. This study aimed to investigate the structural and morphological characteristics of the nylon 6 fiber prepared using five different weights of nylon 6 dissolved in formic acid. The nylon 6 fiber was successfully fabricated via a simple wet spinning method using water as a coagulant. The fiber was then characterized using Fourier transform infrared (FTIR) spectroscopy, optical microscopy, and scanning electron microscopy. FTIR spectroscopy confirmed the presence of nylon …

The Effects Of Boric Acid On The Water Solubility Of Glass Ionomer Cements, Banu Cukurluoz Bayındır, İrem Bağ

Journal of Dentistry Indonesia

Changing the water solubility property of glass ionomer cement (GIC), which is frequently used in pediatric dentistry, is the starting point of this study. Objective: To evaluate the effects of boric acid on the water solubility (WS) of GIC. Methods: The samples were prepared as n=12 in each of four groups: GIC-Conventional glass ionomer cement; BGIC with 1:3 boric acid added to conventional GIC powder; RMGIC-resin-modified glass ionomer cement; BRMGIC with 1:3 boric acid added to RMGIC powder. Weight changes were compared 1, 3 and 24 h after keeping in distilled water. One sample in each group was …

Comparison Of Two Different Intraoral Scanners For Determination Of Caries Related Volume Loss In Caries Removal, Merve Şeker, Elif Alkan, Dilek Tağtekin, Bora Korkut, Funda Yanıkoğlu

Journal of Dentistry Indonesia

Objective: The study aimed to compare cavity volume data obtained with two different intraoral scanners. Methods: One hundred extracted molar teeth were divided into groups according to ICDAS-II classification, and scanned with Cerec Omnicam (Dentsply Sirona) and iTero Element Flex (Align Technology). The caries-infected tissues were removed regarding either minimally invasive or conventional cavity principles. Samples were scanned again and volumetric data were assessed by Meshmixer 3.5 (Autodesk) 3D modeling software. Statistical evaluations were performed with Mann Whitney U test and Spearman’s Correlation test. The significance level was α=0.05. Results: Although there was a significant difference between obtained …

Accuracy And Trueness Of Exporting Computer Aided Designs Of 3-Unit Fixed Dental Prosthesis By 3 Cad Systems, Ezzat Abou-Alnaga, Ashraf Hussein, Ahmed Naguib, Shereen Ahmed Nossair

Future Dental Journal

Objectives: Computer-aided design (CAD) software programs offer the option to export 3D scans and designs across different CADCAM systems, commonly referred to as open CADCAM technology. However, there is insufficient evidence of whether this exporting procedure has an impact on the accuracy of digital designs.This study aimed to investigate the accuracy of exporting of computer aided designs (CAD) of three-unit fixed dental prosthesis using 3 CAD systems. Materials and Methods: Three CAD softwares (inLab 17™, CeraMill Mind™, Dental System 2017™) were used to generate designs of a three-unit fixed partial denture. The designs generated by each CAD software were exported …

Assessment Of The Effect Of Two Different Digital Fabrication Techniques On Marginal And Internal Fit Of Interim Fixed Dental Prothesis, Mohamed A. Shalaby, Mennatallah M. Wahba, Hisham I. Al-Ansari, Ahmed N. Mohamed

Future Dental Journal

Aim: The aim of that study was to evaluate the marginal and internal fit of a 3-unit, and 6-unit interim fixed dental prosthesis manufactured through milling and 3D printing technologies. Materials and Methods: Forty-eight interim fixed dental prostheses (FDP) were equally divided into two groups according to the fabrication technique. In group (MT), specimens were fabricated through milling technology while in group (PT), specimens were obtained by 3D printing. Each group was subdivided equally according to the FDP span length into 3-unit FDP (SFDP), and 6-unit FDP (LFDP). Marginal and internal fit were measured through the superimposition of the digital …

Digital Fabrication Of Attachment For Implant-Anchored Auricular Prosthesis (Case Report)., Hussein El Charkawi Proffesor

Future Dental Journal

Aim: This novel technique, has adopted digital technology to fabricate a customized precision attachment for a patient who has lost his attachment which anchor his implant retained auricular prosthesis. A scanner was used to acquire the ball abutment’ geometry of craniofacial implant in the mastoid area. CAD/CAM technology and special software was used to fabricate a customized small PEEK precision attachment that was no longer available in the market. This attachment was picked-up by an auricular prosthesis. The retention qualities of the auricular prosthesis with this attachment was satisfactory for both the patient and the dentist. This novel approach will …

Computer Guided Versus Conventional Maxillary Sinus Augmentation Using Allogenic Bone Blocks With Simultaneous Implant Placement In Severely Pneumatized Sinuses, Hisham G. Zulhemma Department Of Oral And Maxillofacial Surgery, Future University In Egypt, Egypt. 20172740@Fue.Edu.Eg, Waleed Ragab El-Beialy Professor Of Oral And Maxillofacial Surgery -Cairo University, Egypt. Wbeialy@Yahoo.Com, Ahmed Abd Elsamad Associate Professor Of Oral And Maxillofacial Radiology– Cairo University, Egypt. Abdalsamad_A@Yahoo.Com, Ahmed Abozekry Lecturer Of Oral And Maxillofacial Surgery –Future University In Egypt, Egypt. Ahmed.Kamal@Fue.Edu.Eg

Future Dental Journal

Background: Maxillary sinus lifting is a complex procedure with reported complications in the literature where the presence of sinus septa further complicates the procedure, they including membrane perforation, bleeding. Aim: The aim of this study is to decrease the incidence of membrane perforation which is the most common reported complication, and to determine whether the use of surgical guides could decrease the incidence of membrane perforation. Materials and methods: A total of 12 cases where blindly divided into 2 groups; Group (A) computer guided maxillary sinus lifting and Group (B) conventional sinus lifting, both groups received allogenic bone blocks for …

Analysis Of Changes In Gingiva-Occlusal Parameters As Perceived By Three Middle-East Population., Nadine Nachabeh, Tony Daher, Elie Maalouf Prof, Khalil Kharma, Eliane Kaydouh, Carina Mehanna

International Arab Journal of Dentistry

Purpose. This study aims to compare the effect of various smile parameters (buccal corridor, gummy smile, midline to face discrepancy, with and without upper lip filling) on the perception of smile attractiveness by applying the digital modification of images judged by laypersons from different Middle East populations.

Materials and Methods. One hundred and eighty participants are divided into 3 groups (n=60: 30 men and 30 women): Lebanese, Syrian, and Egyptian laypersons. A frontal photo of a woman's smile is manipulated with Photoshop to modify each smile parameter gradually into 3 grades. The total number of smiles assessed is 18.

In …

Distal Cantilever Length Comparison In Esthetic Material For Hybrid Implant Prosthesis: An In Vitro Study., Sana Shams Eddin, Elie Jasser, Mohammad Chams Eddin, Carole Abi Ghosn Yared, Joseph Makzoumi, Paul Boulos

International Arab Journal of Dentistry

Objective: the assessment of distal cantilever length in implant supported infrastructure by comparing the load to fracture in two different framework esthetic materials (Zirconia and Polyetheretherketone (PEEK)) with two different cantilevers loading distances (10mm, 15mm). Material and methods: 20 frameworks were fabricated and divided into 4 groups (n=5): according to the material type Peek, zirconia, and according to the cantilever loading distance (10), or (15) mm and a load-to-fracture test was used until complete fracture of specimens occurs. Results: The effect of material type and cantilever loading distance were statistically significant for the mean load-to-fracture values (P< 0.05). The Zirconia group failed at higher fracture loads (817 N) than the Peek one (651 N). Frameworks with 10 mm cantilever loading distance failed at higher fracture loads than specimens with 15 mm. Conclusion: Peek is a suitable material for all-on-four framework reconstruction in specific situations, and there is a higher success rate when the distal cantilever length is kept at minimal value (10mm).

Evaluation Of Heated Cure Acrylic Immersed In Ozonated Water, Shawq Azmi Tawfeeq, Aseel Mohammed Al-Khafaji

Maaen Journal for Medical Sciences

Background: Denture cleansing is an important step that can prevent the spread of infection and improve a patient's health, the durability of the dentures, and the overall quality of life; therefore, it is necessary to choose a suitable cleanser that, in addition to being effective, does not have an unfavorable effect on the qualities of the denture base resin itself when used for an extended period.

Aim: This research aims to assess the effects of ozonated water on the surface roughness and hardness of heat-cured acrylic resin by immersion technique.

Materials: Sixty bars shape made of heat-cured acrylic were manufactured. …

Evaluation Of Color Difference And Translucency Of Modified Peek Restorations Veneered With Different Veneering Materials Before And After Thermal Cycling, Mohamed Hamdy Abdulmaguied, Tarek Salah Morsi, Mennatallah M. Wahba, Hesham Katamish

Future Dental Journal

Objective: The aim of this study was to investigate the effect of different PEEK veneering materials, as well as thermocycling on the color difference (ΔE) and the translucency parameter (TP) of modified PEEK veneered restorations.

Materials and Methods: Thirty disc shaped specimens of veneered BioHPP (1.5 mm X 12 mm) were randomly divided into three groups (n=10) based on the type of the veneering material. Group (A): Discs veneered with CAD milled Lithium Disilicate, group (B): Discs veneered with pre-cured milled composite, and group (C): Discs veneered with conventional light cured composite. CIELab values were calculated for all specimens over …

Influence Of The Margin Design On The Fracture Resistance Of Implant Supported Monolithic Zirconia Crowns, Camille Haddad, Ryan Harouny, Karim Corbani, Lara Nasr, Ronn Tassidis

International Arab Journal of Dentistry

The purpose of this in vitro study was to test the influence of the margin design of implant supported monolithic zirconia crowns and test if monolithic zirconia crowns with extra fine finish line thickness cemented on zirconia implant abutments can bare the maximum masticatory forces on molars and hence be used in the posterior region. Fourteen identical monolithic zirconia crowns cemented on zirconia implant abutments mounted on titanium bases and fixed on implant replicas embedded in PMMA resin were divided into two groups: group I designed with a 0.5 mm CFL (CFL) and group II with a feather-edge finish line …

Rehabilitation Of A Patient With Single Complete Tooth Supported Overdenture Against The Unmodified Natural Dentition Using Functionally Generated Path Technique- A Case Report, Dr.Akanksha Shinde, Dr.Nilesh Bulbule, Dr.Varun Bhatt, Dr.Gayathri B, Dr.Amit Jagtap

International Arab Journal of Dentistry

Meyer’s proposed chew-in technique also called functionally generated path (FGP) technique, is indicated for the restoration of an edentulous arch that is opposed by natural teeth as it does seem to provide the most accurate method of recording occlusal patterns, also help to minimize the effects of negative factors, and to overcome the deficiencies of articulators [1]. As stated by Rudd and Morrow, this technique is especially suitable for tooth-supported complete dentures, due to inherent stability of tooth-supported record bases helps in recording jaw relationships accurately.

Whenever a single complete denture is opposed by natural dentition, problems observed are abrasion …

Orofacial Esthetic Scale (Oes) And Psychosocial Impact Of Dental Aesthetic Questionnaire (Pidaq): Development And Psychometric Properties Of The Central Indian Version, Gunjan H. Taori, Amit Reche Mds, Chinmayee Dahihandekar Mds, Kaustubh Mantri, Neshant Rathi

International Arab Journal of Dentistry

Background: Orofacial Esthetic Scale (OES) is use to test psychometric properties of Indian population and Indian version of Psychosocial Impact of Dental Aesthetic Questionnaire (PIDAQ) for psychometric evaluation. The aim of this study is to develop Orofacial Esthetic Scale (OES) and to test psychometric properties of individuals in Indian version in the cultural environment in central India.

Materials and methods: A hospital based cross sectional study was done where altogether 30 questions were asked to patients, their relatives and Dentists. Out of which 8 questions were related to Orofacial Esthetics Scale(OES) whereas 24 pertaining to Psychosocial Impact of Dental Aesthetic …

Effect Of Different Surface Treatments And Application Times On Shear Bond Strength Between Polyetheretherketone And Composite Resin, Alper Ozdogan, Basak Topdagi

Journal of Dentistry Indonesia

Objective: To investigate the effect of various surface treatments and different application times on shear bond strength between polyetheretherketone and composite resin. Methods: A total of 110 disc-shaped polyetheretherketone specimens were randomly divided into 9 groups and 4 different surface treatments (control, sandblasting, tribochemical silica coating, sulfuric acid) were applied. The sandblasting, tribochemical silica coating, and sulfuric acid processes were performed 3 different times (10s, 15s, 20s). Then, the composite resins were applied to the treated surfaces of the polyetheretherketone specimens. The shear bond strength test and scanning electron microscopy analysis were performed. The data were statistically analyzed using …

Modified Maxillary Palatal Ramp Prosthesis To Guide Mandibular Deviation Following Segmental Mandibulectomy For Squamous Cell Carcinoma, Manu Rathee, Sujata Chahal, Maqbul Alam, Prachi Jain

Journal of Dentistry Indonesia

Benign or malignant tumor is one of the frequent causes of resection of the mandible. The extent and location of the tumor decides the mode of treatment of the neoplastic lesion. Surgical removal of oral neoplasm leads to an extensive resection of the mandible along with the associated structures. Objective: This case report describes the use of palatal ramp prosthesis to guide the mandible during movements and restore a stable occlusal relationship with an additional acrylic buccal pad to achieve partial esthetics. Case Report: A 30-years-old female patient reported with the inability to chew food following the mandibular resection of …

Evaluation Of Porcelain To Metal Bond Strength On Use Of Recast Nickel-Chromium Alloy, Prakash Manne, Kavya Ravuri

Manipal Journal of Medical Sciences

Purpose: The objective is to assess how the bond between metal and ceramic is impacted by recasting the base metal alloy. Materials and Methods: A total of 78 metal-ceramic specimens were created using beryllium-free nickel-chromium alloy from Dentalloy International Pvt Ltd. There were 26 specimens in each of the three groups, and they were all prepared differently. The first group was cast from 100% fresh alloy and served as the control. The second group was made by mixing 50% used (once cast) alloy and 50% fresh alloy. The third group was cast using 100% reused (once-cast) alloy. All of the …