Journal of Dentomaxillofacil Radiology, Pathology and Surgery
Volume:12 Issue: 3, Summer 2023

 Translucency is one of the important optical properties of tooth color materials and it is greatly affected by the thickness of material. This study concerns comparing the translucency parameter (TP) of five different composite resins in different thicknesses.

Five brands of composite resins; Gradia (GC) ,Crystalline (Confi-dental) Vit-l-escence (Ultradent) in A2, and Herculite XRV (Kerr), Opallis (FGM) in enamel A2 (EA2) shades were selected to enroll the study. Color coordinates of each composite were determined at 0.5, 1, and 1.5 mm thicknesses on a white backing, the backing of material itself and a black backing were calculated by using a spectrophotometer to evaluate the translucency parameter (TP) of the study materials. The masking ability was also calculated from the specimens on the material itself and on black backing. The values under 2 were estimated as imperceptible. One-way ANOVA, T-test and Tukey HSD were employed for statistical analysis.

Opallis (EA2) showed the less TP values in all thicknesses in comparison to the other materials (p< 0.05) but there was no statistically significant difference between TP values of Gradia and Opallis in 1.5 and 0.5 mm-thick. The masking ability values recorded for all specimens at different thicknesses, were in the range of perceptible.

In this study, translucency of Opallis (EA2) and Gradia(A2) was less than the other enamel /universal shade composites. For this reason, it would be concluded that if the restoration thickness is ≤1.5mm, these enamel/universal shade composite resins cannot mask the black background color.

Oroantral Fistula (OAF) is a pathologic and epithelialized path between the oral cavity and the maxillary sinus. Various reasons can lead to its development, the most common of which is the extracion of upper molar teeth. Any condition that leads to traumatized tooth extraction or conditions that make tooth extraction more difficult, such as: improper use of an dental elevator, teeth with long roots near the sinus, dental infections, etc., increase the probability of this problem.The most common age of occurrence of OAF is between 30 & 60 years old.most studies suggest that smaller fistulas have a chance of healing spontaneously, but larger types and those that persist for a longer period of time usually do not heal without intervention. It can lead to uncomfortable side effects such as pain, sinusitis, air escaping from the mouth to the nose, and even a change in the person's voice and overall discomfort in the patient. Various surgical and non-surgical treatments have been proposed for the management of OAF. Non- surgical treatments include blocking the area by placing different materials inside defect, and surgical treatments include closing the area with local and regional flaps or in combination with Autografts and Allografts, etc. The purpose of this review article is to investigate the etiology factors of OAF, the prevalence rate and the ways of its management by various surgical and non- surgical treatments.

Basal cell carcinoma (BCC) is the most common skin cancer. The nature of BCC is slow growth, locally invasive and rarely impacts other areas of the body. Because exposure to sunlight for a long time is the main cause of BCC, it usually occurs in the head and neck area, and the nose has the highest risk of involvement. Most patients with BCC are treated with surgery, leading to poor cosmetic results. Nasal defects can be reconstructed using flap surgery or using extraoral prostheses or a combination of these two methods. If the lesion is large, surgical reconstruction is limited. In addition, radiotherapy before surgery delays the wound healing process and increases the risk of failure. Therefore, when we cannot use surgical methods for reconstruction, we can use prosthetic reconstruction methods. The advantages of prosthetic reconstruction include better color matching, comfort, no need for a graft donor site, and lower cost. The present report describes the clinical techniques of   fabricating a nasal prosthesis in a patient with total rhinectomy and upper lip resection due to basal cell carcinoma.

When placing a proximal resin composite restoration, it is recommended to use a matrix system for restoring interproximal surfaces. Although sectional matrix systems are useful, they can be technique-sensitive and are passively placed. There is a need for an improved matrix band that overcomes these shortcomings. The objective of this study is to introduce a new technique for interproximal restoration of composite resin using a matrix system.

Determining the prevalence of tooth erosion in each population with the aim of estimating dental health status and identifying risk groups is a research necessity. Evidence suggests an increase in the prevalence of this disorder in the population. This study aimed to investigate the prevalence of dental wear in patients admitted to the dentistry department of Guilan was conducted.

This cross-sectional descriptive – analysis study of 140 patients in Guilan University of Medical Sciences in 1398 will be evaluated. Demographic information about the gender and age of the patients were collected and analyzed in terms of tooth wear (Erosion, Abrasion, Attrition, Abfraction) were examined. The data were analyzed by software SPSS for windows version 16 at the significant level of 0/05.

Descriptive findings showed that out of 140 people, 85 (60.7%) women and 55 (39.3%) were male. Also, the age distribution of participants in the research showed that the age group was less than 50 years old (49.3%) and the age group was over 50 years old (50.7%). The mean age of the participants in the study was 29.25 ± 15.7. In the sample, Attrition showed the highest prevalence with 75.2% and Abrasion with 0.7% lower prevalence. The prevalence of multiple lesions and Erosion was 4.1% and 22.6%, respectively..

Among the various dental abrasions, Attrition was the highest prevalence in the population. There was no significant correlation between age and gender with different types of tooth wear.

Indirect metal-ceramic restorations can be repaired intra-orally  by using composite resins. The purpose of this study was  to evaluate the effect of  several adhesives and metal primer on shear bond strength(SBS)of flowable composite to nickel-chromium(Ni-Cr) alloy.

In this in vitro study, 100 Ni-Cr alloy specimens were casted measuring 2x10x8 mm. The surface of all specimens was sandblasted, and they were randomly assigned to five groups (n=20) of no primer or adhesive (group 1 or control),alloy primer (AP; group 2), AP+Single Bond 2 (SB2) adhesive (group 3),AP+G-Premio Bond (group 4), and G-Premio Bond alone (group 5).Flowable composite was bonded to the surfaces in cylindrical plastic molds (3 mm in diameter and height). The specimens were stored in distilled water at room temperature for 24 hours. Thermocycling was performed for 1000 cycles. The SBS was measured by a universal testing machine. Failure mode was also evaluated under a stereomicroscope.

The SBS of composite to alloy was the highest in G-Premio group (20.09±14.27MPa), and the lowest in the control group (11.11±5.35MPa). The failure mode in the four experimental groups was mainly mixed while the control specimens showed adhesive failure(P≤0.05).

It maybe concluded that G-Premio universal adhesive can create a strong bond to Ni-Cr alloy.