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ORIGINAL ARTICLES
A clinical comparative study of four interocclusal recording materials
Mohammad Kinan Seirawan, Sham Alobeissi, Mazen Doumani, Bilal D Mourshed, Mohammad Yaman Seirawan, Khaled Al-Hallak, Eyad Alshaarani
0, 0(0):0-0
DOI:10.4103/INJO.INJO_23_19  
Objective: The aim of the study was to evaluate the accuracy of four interocclusal recording materials and its effect on the relationship of the casts. Materials and Methods: The study was conducted on a group of 25 partially edentulous patients with upper complete natural dentition and lower bilateral free end edentulous areas. Ten pairs of reference points were drawn on the lateral surfaces of the base of each cast pair when the casts were manually articulated in maximum intercuspation position. The vertical distances between each pair of reference points were measured by a scanner and computerized software. Four interocclusal records were made for each patient by four interocclusal recording materials: zinc oxide eugenol paste, polyvinyl siloxane, Aluwax, and Baseplate wax. The casts were fixed on each record, and the vertical separation, anteroposterior, and lateral displacement were measured and calculated. Results: Polyvinyl siloxane was significantly more likely to lead to successful articulation than other interocclusal recording materials. Aluwax caused the highest vertical separation whereas Baseplate wax caused the greatest lateral displacement between the casts. Conclusion: Polyvinyl siloxane interocclusal recording material was the most accurate whereas Waxes were the least reliable materials.
  1 1,926 57
Comparative evaluation of surface roughness of novel resin composite Cention N with Filtek Z350 XT: In vitro study
Amith Setty, Jyothi Nagesh, Jayashankara Chatra Marigowda, Anil kumar Shivanna, Sharath Kumar Paluvary, Girish Sooranagenahalli Ashwathappa
January-March 2019, 7(1):15-17
DOI:10.4103/INJO.INJO_9_19  
Aim: The aim of this study was to evaluate and compare the surface roughness of Cention N and Filtek Z350 XT resin composite. Null Hypothesis: There is no difference observed in surface roughness between the Cention N and Filtek Z350 XT resin composite. Introduction: The use of resin composites in restorative dentistry has markedly increased in recent years due to increased demand for esthetics. The advent of novel fluoride-releasing resin composite Cention N has brought enormous benefits. Finishing and polishing of composite resin restorations are essential steps in restorative dentistry. However, there are no studies available in literatures regarding the effective use of Soflex finishing and polishing with Cention N. Hence, the purpose of the study was to evaluate the surface roughness of novel resin composite Cention N and compare with Filtek Z350 XT resin composite. Materials and Methods: Sixty-four specimens were prepared in Teflon plastic mold of 8-mm diameter and 2-mm thickness, and were divided into group 1 (Filtek Z350 XT [n = 32]) and group 2 (Cention N [n = 32]). They were further subdivided into group 1A (Matrix finish [n = 16]) and 1B (Soflex [n = 16]), and group 2A (Matrix finish [n = 16]) and 2B (Soflex [n = 16]). Surface roughness was measured using surface profilometer. Results: When comparing the mean values and standard deviations of surface roughness of four groups using one-way ANOVA, it was found that there was a significant difference (P < 0.001) in mean surface roughness between the four groups. Conclusion: All the groups presented the values that are below or approximating baseline value for bacterial or plaque retention.
  1 2,821 407
A clinical comparative study of four interocclusal recording materials
Mohammad Kinan Seirawan, Sham Alobeissi, Mazen Doumani, Bilal D Mourshed, Mohammad Yaman Seirawan, Khaled Al-Hallak, Eyad Alshaarani
April-June 2019, 7(2):30-34
DOI:10.4103/INJO.INJO_23_19  
Objective: The aim of the study was to evaluate the accuracy of four interocclusal recording materials and its effect on the relationship of the casts. Materials and Methods: The study was conducted on a group of 25 partially edentulous patients with upper complete natural dentition and lower bilateral free end edentulous areas. Ten pairs of reference points were drawn on the lateral surfaces of the base of each cast pair when the casts were manually articulated in maximum intercuspation position. The vertical distances between each pair of reference points were measured by a scanner and computerized software. Four interocclusal records were made for each patient by four interocclusal recording materials: zinc oxide eugenol paste, polyvinyl siloxane, Aluwax, and Baseplate wax. The casts were fixed on each record, and the vertical separation, anteroposterior, and lateral displacement were measured and calculated. Results: Polyvinyl siloxane was significantly more likely to lead to successful articulation than other interocclusal recording materials. Aluwax caused the highest vertical separation whereas Baseplate wax caused the greatest lateral displacement between the casts. Conclusion: Polyvinyl siloxane interocclusal recording material was the most accurate whereas Waxes were the least reliable materials.
  1 2,518 271
Comparison of bond strength and fracture toughness of metal–ceramic restorations fabricated by conventional lost-wax technique and selective laser sintering
Rajneesh Kumar, Rupali Pathak, Priya Singh, Sonali Mahajan, Devesh Tiwari, Prachi Deval
April-June 2019, 7(2):43-45
DOI:10.4103/INJO.INJO_26_19  
Introduction: Porcelain fused to metal is the most common restoration. The success of the prosthesis greatly depends on the mechanical bonding between the metal alloy and the ceramic. Newer techniques such as selective laser sintering (SLS) and computer-aided design are fast replacing the lost-wax technique due to ease of fabrication. This study was carried out to ascertain the best possible technique to ensure success. Materials and Methods: Forty strips of cobalt–chromium (Co–Cr) metal were fabricated and divided into two groups (lost-wax technique vs. SLS technology), which were then bonded with ceramic and compared for bond strength and fracture toughness. Results: SLS group showed higher bond strength than conventional lost-wax technique (CAST) group but lowered fracture toughness. This difference was also found to be statistically significant. Conclusion: The lost-wax technique is a time-tested method that needs not be abandoned until successful evolution of emerging technologies is firmly established.
  1 1,876 235
REVIEW ARTICLES
Adverse effects of tooth bleaching: A review
Fatima L AlOtaibi
April-June 2019, 7(2):53-55
DOI:10.4103/INJO.INJO_22_19  
Current bleaching methods mainly use hydrogen peroxide as the active agents. Tooth whitening is achieved either by in-office bleaching technique or self-applied or home bleach method. This review focused mainly on the adverse outcomes of tooth bleaching such as cervical root resorption, crown fracture, tooth sensitivity, mucosal reaction, and enamel surface alterations produced during the treatment and the management of vital and non-vital teeth-bleaching procedures. Cervical root resorption is one of the unwanted effects observed with the internal bleaching, especially seen with thermo-catalytic procedures. There is a possibility of crown fracture after intracoronal bleaching most likely due to the extensive removal of the intracoronal dentin. One of the common side effects of external tooth bleaching is the tooth sensitivity that ranged between 15% and 65%. Another important adverse effect of high concentration of hydrogen peroxide bleaching is the mucosal irritation ranged between 30% and 35%. Morphologic changes of enamel were also observed with the use of higher concentration of bleaching agents. In view of this review, it is highly desirable to take all the necessary precautions and considerations while performing tooth-bleaching treatment.
  1 4,407 413
Need for speed in orthodontics: A review of noninvasive methods to accelerate the orthodontic tooth movement
T Sri Santosh, Konkati Srikanth, Dasagari Haritha, Mandadi Lohith Reddy, Bukkarayasamudram Ravi Chandra, Reshu Parmar
July-September 2020, 8(3):48-51
DOI:10.4103/INJO.INJO_20_20  
Orthodontic treatment improves facial and smile esthetics along with oral function and psychosocial well being of an individual. Prolonged treatment time is one of the greatest challenges in orthodontics which declines patient’s satisfaction and increases the exposure of the patient to oral health risks such as decalfication of teeth, dental caries, periodontal disease, and root resorption. Most of the orthodontists are interested in noninvasive procedures which will also increase the acceptance of the treatment for both orthodontists and patients. Noninvasive methods that have shown promising results to accelerate the orthodontic tooth movement are vibrational forces, photobiomodulation, and low-intensity pulsed ultrasound (LIPUS). The current evidence presented in this review have shown successful results which is fascinating, further research is needed to explore the utility of these methods as an adjunct in the speciality of orthodontics to reduce the overall treatment duration, risks associated with prolonged treatment and increase patient’s compliance.
  1 1,240 110
* Source: CrossRef