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Effect of Veneering Technique on Color Matching of Translucent Ice Zirconia Substructure Veneered with Lithium Disilicate Using Pressable Technique Versus Conventional Layering Technique: An In-Vitro Study

ABSTRACT Aim. This study evaluated the effect of different veneering techniques on the color of translucent Ice zirconia substructure. Methods. A total of twenty translucent Ice Zirconia disc samples 12 mm in a diameter, 0.5 mm in thickness were designed and constructed using zirkonzahn system. The samples were classified into two groups: Group I: (n = 10) veneered by layering technique using IPS emax Ceram 1.0 mm thickness, dentin shade A2. Group II (n = 10) veneered by press-on technique using IPS emax press in-got 1.0 mm thickness, shade A2. Twenty composite resin discs 12mm in diameter and 5mm in thickness in A3 shade, were fabricated to be bonded to ceramic specimens using Dual-curing translucent rely X Unicem automix Self-Adhesive Resin luting cement. The color measurement was done using a spectrophotometer unit and ΔE was calculated. Color parameters were obtained using a spectrophotometer and were used to calculate color difference value with the preselected required color A2 tab according to Vita Classical shade guide (target shade). Color difference value (ΔE=3.7) was considered a clinically acceptable color match. Data were presented as means and standard deviation (SD) values. The independent t-test was used to compare between veneering techniques with 1mm veneer thickness. Results. The results showed that veneering techniques had a significant effect on mean (ΔE) values at P ≤ 0.001. The Press-on technique showed higher statistical significance difference (ΔE) Values (4.55±0.93) than layering technique (ΔE) Values (2.25±1.04) at p ≤ 0.001. Conclusion. The proper color matching of veneered zirconia is greatly affected by the veneering techniques. The layering technique is preferred regarding color matching.
Nourelhouda Salaheddin Misurati, Noora Berhaim, Milad Eshah, Mohamed Zeglam(7-2022)

PREVENTIVE MEASURES IMPLEMENTATION AMONG LIBYAN GENERAL DENTISTS AND PROSTHODONTISTS DURING COVID-19 OUTBREAK IN TRIPOLI: A CROSS-SECTIONAL STUDY.

Abstract Introduction: The available knowledge about Covid-19 mandate applying set of strict preventive measures for medical and dental professions. Dental health personnel are considered among high risk occupation group during the pandemic. Objective: This study aimed to assess the level of adherence to the preventive measures against the coronavirus disease and infection control among prosthodontists and general dentists in Tripoli, Libya. Methods: A questionnaire consisting of 8 questions was distributed among dentists who are working in private clinics or public health centers during Covid-19 pandemic, in Tripoli. Dentists were selected randomly to participate in this survey. Results: This study included a total of 70 dentists forming a response rate of about 87,5% (70 dentists participated out of 80 dentists), a total of 19 were prosthodontists and 51 were general dentists. The results showed that only 32% had attended lectures regarding COVID-19. The percentage of dentists who wear PPE during fixing post insertion complete denture complains and during fixing high spots before final cown/ bridge cementation were (60%, and 61.4%) respectively. During dental treatment, all dentists reported they do keep frequent hand hygiene by using ABHR or water and soap, (72.8%) ask their patients for pre procedural mouth rinse before starting the treatment, (62.8%) stated that they use rubber dam during aerosol generating procedures.. Conclusions: Libyan dentists in this study showed practicing of moderate infection control procedures to minimize transmission of Covid-19, limited comprehension of what constitutes as emergency dental procedures was recognized. Dentists are required for attending awareness days and workshops in this respect. Keywords: COVID-19, Dentists, Preventive measures, Infection control.
Nourelhouda Salaheddin Misurati, Hala Abdallah Traina, Noora Shaaban Berhaim(2-2021)

Assessment of Crown and Fixed Partial Denture Work quality: A Survey among General Dentists and Specialists in Tripoli, Libya

ABSTRACT Anecdotal evidence suggests that impression materials and techniques used in general dental practice for fixed partial dentures vary from those taught in dental schools. Very few studies have been done in Tripoli, Libya to assess the trends of fixed partial denture practice done by private practitioners. This survey used a questionnaire which was designed to assess the quality of crown and fixed partial denture work amongst dentists in Tripoli, Libya. A questionnaire consisting of 12 questions was distributed randomly among 200 specialists and general dentists who work in private clinics and public health centers in Tripoli; out of which 146 were filled, giving a response rate of 73%. The results showed that, 23.25% mpression, while 98% of prosthodontists always make a primary impression. Only 47.8% of general dentists use retraction cord while 52.3% of the surveyed general dentists never applied retraction cord in crown and bridge practice. Amongst the prosthodontists, 92.85% use gingival retraction cord, 7.14% use electrosurgery for gingival retraction. 38.63% of the surveyed general dentists in this study never disinfect the impression before sending it to the dental laboratory, while 45.7% of prosthodontists always disinfect the impression and 42.2% often, and only 12.1% never. Results showed that 53.49% of the surveyed general dentists never use temporary crown and bridge after tooth preparation, and 46.51% use temporary crown and bridge after tooth preparation, on the other hand 93% of prosthodontists use temporary prosthesis after tooth preparation. Amongst the prosthodontists, and general dentists glass ionomer cement is most commonly used for cementation of fixed partial denture, followed by adhesive resin cement and zinc polycarboxylate cement. It was concluded that, the ideal materials, technique, and armamentarium are required for the long-term success of the fixed prosthodontics work. Most of the prosthodontists used recommended impression materials and techniques, which were not followed by the majority of general dentists. Keywords- Survey; Fixed partial denture; Impression materials; Prosthodontists.
Nourelhouda Salaheddin Misurati, Noora Berhaim(6-2018)

Assessment of Color Difference of Translucent Zirconia Substructure Veneered Using a Layering Technique with Two Different Veneering Thicknesses: An in-vitro study

ABSTRACT Background and objectives. The introduction of zirconia to the dental field created a path for development of new designs and applications, but still, a minimum framework thickness of 0.5 mm with the remaining thickness of the restoration used for building the ceramic veneer was always recommended. This might have possibly affected the final shade of the restoration due to the whitish color of Y-TZP. This in vitro study was designed to assess the color difference of translucent zirconia substructure veneered using a traditional layering technique with two different veneering thicknesses. Methods. A total of twenty translucent Ice zirconia disc samples with standardized dimensions 12 mm in a diameter, 0.5mm in thickness were designed and constructed using zirkonzahn system. The samples were classified into two groups: Group I: (n = 10) veneered by 0.5 mm thickness layering technique using IPS emax Ceram dentin shade A2. Group II (n = 10) veneered by 1 mm thickness layering technique using IPS emax Ceram dentin shade A2. Twenty composite resin discs 12mm in diameter and 5mm in thickness in A3 shade, were fabricated to be bonded to ceramic specimens using Dual-curing translucent rely X Unicem automix Self-Adhesive Resin luting cement. Spectrophotometer was used to measure color parameters L*, a*, b* for all samples. ΔE values were measured to determine color differences between the specimens and the A2 VITA classical shade (target shade). ΔE values were compared with an acceptability threshold (ΔE=3.7). Independent t-test was used to analyze data (P
Noora Berhaim , Nourelhouda Misurati, Milad Eshah, Mohamed Zeglam(7-2022)
موقع المنشور

A to Z INSTRUMENTS AND EQUIPMENTS FOR FIXED PROSTHODONTICS

This book was designed to provide dental students an overview about the instruments which used in fixed Prosthodontics. It is useful as a revision and reference tool. It is also prepared to be easy to read for dental students and general dental practitioner. The book aimed to enhance the knowledge and understanding the application of the instruments and equipment used to make crowns and bridges from the beginning of the diagnosis stage till the delivery of final restoration. Dental practitioner must have a thorough background about the knowledge and function of each instrument to be used in fabrication of a fixed partial denture as a first step in the patient treatment.
Seham Elsawaay(1-2022)

EFFECT OF MARGIN CONFIGURATION ON MARGINAL ADAPTATION OF ALL CERAMIC CROWNS A LITERATURE OF REVIEW

All -ceramic restorations are nowadays widely accepted in the anterior and posterior regions. The geometry of tooth preparation has been the subject of many debates without clear evidence that one type of finish line provides consistently superior marginal fit. Therefore, the main interest of the present research was directed toward the influence of margin configuration on marginal adaptation of all ceramic crowns. Articles were selected on the basis of they had sufficient information related to types of the finish line and related factors effect on marginal adaptation of all ceramic crowns. The results of this study revealed that the best finish line chose for all ceramic restorations still remains a difficult goal to be achieved. arabic 14 English 84
Seham Ali Elsawaay*, Milad Mustafa Eshah, Mohamed Albasher Zeglam(1-2019)
موقع المنشور

Radiographical outcomes of fixed dental prosthesis abutment teeth (Retrospective study)

The aim of the present study was to evaluate abutments of crowns and conventional fixed dental prosthesis in terms of complying Ante’s law, and periapical lesions through a retrospective analysis of orthopantomographs (OPTGs) of patients in private dental clinic. In this study, the digital OPTGs of adult patients between the ages of 30 and 75 who appealed to private dental clinic for the first time to have their fixed prosthetic treatment needs met were used. The routine dental radiographs were taken in the first appointment of the patients. The periapical health of all teeth restored with crowns and bridges were evaluated by radiographic criteria according to periapical index (PAI). The present study comprised panoramic radiographs belongs to43 women and 27 men with an age range of 30 to 75 years old. No relationship was observed between gender and periapical lesion. While the amount of fixed prosthesis was highest in the lower jaw with 54%. The most commonly used abutment tooth were premolar teeth.36% of bridges didn’t meet the requirements of Ante’s law. More periapical lesion were observed among the restorations which doesn’t meet the requirements of Ante’s law. According to the results of the present study, the restoring of missing teeth with FPDs may cause different periapical pathologies. Optimum evaluation of abutments regarding to Ante’s law and periapical status may decrease the complications that could be observed in long term prognosis of FPDs arabic 11 English 76
Seham A. Elsawaay, Enas A.Khamakhim(5-2019)
عرض

Evaluation of the shear bond and bi-axial flexural strength of zircona core veneered by CAD/CAM and PRESS-ON technique

The aim of this in vitro study is to compare the shear bond and bi-axial flexural strengths of samples veneered with, CAD/CAM-fabricated zirconia core, and Press-on technique, with the definition its mode of failure. Twenty zirconia core discs were made using IPs e.max ZirCAD and CAD/CAM technology. These were divided equally in to two groups. Group one was veneered by CAD-on technique using IPs e.max CAD, and group two was veneered by Press-on technique using IPs e.max ZirPress, then all the discs are thermocycled. The specimens were exposed to shear bond and biaxial flexural strength testing. Mode of failure was evaluated by SEM. All data were collected and analyzed statistically by SPSS, with significance level 5%, where P≤ 0.05. The t- test analysis of shear strength test showed statistically significant difference at (p < 0.05) for CAD-on group. While there were no statistically significant difference at (p < 0.05) for the biaxial flexural strength test between the two groups. CAD-on group showed adhesive/cohesive failure, while press-on group showed cohesive failure within the veneering ceramic. This study concluded that, the bond strength between zirconia core and veneer was affected by the veneering technique. CAD-on technique showed statistically significant high bond strength over Press-on technique arabic 20 English 98
Seham Ali Elsawaay*, Milad Mustafa Eshah, Mohamed Al basher Zeglam(1-2018)