Key Clinical MessageHypohydrotic ectodermal dysplasia is a hereditary disorder, which affects ectodermal derivatives. It manifests several abnormalities of the teeth, and is commonly inherited through female carriers. This case report presents a patient with compromised esthetics and function. A multidisciplinary approach was planned involving an oral pathologist, endodontist, orthodontist and a prosthodontist.
Purpose:
The aim of the study was to evaluate the effect of incorporation of organically modified nanoclay in 1%, 3%, and 5% by weight on the flexural strength, surface hardness, and linear polymerization shrinkage of heat cure denture base material.
Materials and Methods:
One hundred and twenty specimens of heat-polymerized acrylic resin were fabricated. The specimens were divided into four groups (
n
= 10) coded I to IV. Group I was the control group (unmodified acrylic resin specimens). The specimens of the remaining three groups were reinforced with nanoclay (organically modified montmorillonite) nanoparticles to achieve loadings of 1%, 3%, and 5% by weight. The resulting nanocomposites were subjected to mechanical testing and were characterized using X-ray diffraction, scanning electron microscope, and transmission electron microscope.
Results:
The statistical analysis showed that there was no significant increase in flexural strength within and between the groups. The most significant increase in surface hardness was observed between Group I (control) and Group II (1% nanoclay). Linear polymerization shrinkage of the specimens showed a significant decrease in the control and all the experimental groups.
Conclusion:
Addition of 1 wt% nanoclay to polymethyl methacrylate heat cure denture base material could enhance the surface hardness and reduce the linear polymerization shrinkage of the resin. However, there was no significant increase in flexural strength of the resulting nanocomposite.
Aim: The objective of this article is to review information on laser welding of dental alloys. Its rationale, design, advantages, and disadvantages have been reviewed and compared with the conventional techniques of joining dental alloys. Its effects on the commonly used dental alloys and its associated welding defects have also been discussed.Materials and Methods: A broad search of the published literature was performed using Medline and pub med from 1960 to 2012. The key words used for the search were ‘laser welding’, ‘dental alloys’, ‘laser parameters’, ‘welding principle’ and ‘welding procedure’. It was observed that much of the research work was done from the year 2000 onwards. A hand search of textbooks, relevant articles, and manufacturers’ literature was also conducted.Results: Within the limitations of the information obtained and systematically reviewed, it can be inferred that laser beam welding definitely outwits the conventional procedures of joining dental alloys. High precision, accuracy and productivity, reduced distortion, high mechanical strength of the weld joint, corrosion resistant weld joint are a few advantages of laser beam welding technique. The main drawback of laser welding includes its high investment, operating and maintenance costs. To overcome the minor drawbacks of laser welding, TIG welding has been introduced. It involves reduced investment costs, very compact dimensions, low weight, maintenance free and low operating costs.Conclusion: A number of techniques are available for joining dental alloys; each having its own pros and cons. Laser welding still remains the recommended technique due to its precision and accuracy. Continuing research and development are resulting in newer technologies that can overcome the drawbacks of previous techniques. This will provide clinicians and technicians more options in the realm of adequate training and operator expertise.
Key Clinical MessageComplete dentures are poorly tolerated in patients with xerostomia. A salivary reservoir can be incorporated into a denture that provides slow, sustained, and continuous release of salivary substitute. This article describes a simple, cost‐effective, and innovative technique of fabrication and designing of functional maxillary salivary reservoir complete denture.
Temporomandibular joint (TMJ) is a ginglymoarthrodialsynovialcompound joint which consists of an articular disc, 2 bones(mandible and temporal bone), a fibrous capsule, intra-articular fluid, a synovial membrane and ligaments [1]. (fig 1)
Defects in the maxillofacial region can be congenital or acquired, and may negatively affect their physical and psychological health, hence such defects require rehabilitation to improve the quality of life. Maxillofacial prosthesis helps in substituting these missing body parts. The mode of retention is always challenging. Apart from the various modes of retention available, a thorough treatment planning can give a better quality of maxillofacial prostheses. The type of retentive to be given depends on several factors such as the shape and size of the defect, the systemic conditions and the age of the patient. Using ideal retentive aids along with the aesthetic, functional and economic factors helps in achieving successful outcomes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.