How to cite this article:
Dang MK, Ram SM. Evaluation of the stress distribution and displacement of the denture base in edentulous mandible with varied implant positions. J Contemp Dent 2011; 1 (2):14-20.
To evaluate the stress distribution and displacement of the denture base in a three dimensional finite element edentulous mandibular model with varied implant positions.
1)To evaluate the stresses induced by implants placed in the anterior region of the edentulous mandible. 2)To evaluate the stresses induced by implants placed in the anterior and posterior region of the edentulous mandible. 3)To compare the stresses induced by implants placed in the anterior and posterior region of the edentulous mandible. 4)To evaluate the displacement of the denture base with implants placed in the anterior and posterior region of the edentulous mandible.5)To compare the displacement of the denture base with implants placed in the anterior and posterior region of the edentulous mandible.
Materials and Methods
The materials used were Nobel Biocare Mk III long implants 3.75×13mm and short 5.0×7.0 implants, with O-ball head attachment. ANSYS: Version 8.0 software was used to create a threedimensional model of an edentulous mandible and the two implants. Three models were prepared having different implant positions and locations. MODEL 1 Two long implants were placed interforaminally in lateral incisor region one on either side, MODEL 2 Four long implants placed were interforaminally in the central incisor and canine region two on either side and, MODEL 3 Two long implants were placed interforaminally in lateral incisor region one on either side and two short implants were placed in premolar region 3mm posterior to the mental foramen, one on either side. Two types of load were given ie. vertical load of 325N was applied in second premolar and first molar region and 10N load at 150 angulation was applied in the anterior incisors area. The models were loaded separately and stress pattern, amount of stresses and amount of displacement were analysed for each model.
The observations obtained from the ANSYS software were analysed and evaluated. Model 3 showed the least amount of stress and displacement as compared to the other models.
When the implants were spread across the arch both anteriorly and posteriorly, the stress induced in the bone and displacement of the denture base was seen to be less.
Girish R. Karandikar,
Anita G. Karandikar,
Madhur Vasudev Navlani
Although most malocclusions pertaining to irregularities of teeth resolve through moving teeth, occasional malocclusions confront us with a disharmonious inter-jaw-relationship owing to faulty size and/ or faulty anteroposterior location of the jaws or dentoalveolar regions. These malocclusions do not always respond favorably to conventional tooth moving appliances and are ideal candidates for appliances that have the capability of molding bones as well as relocating them. Through this article, the authors outline a way that General Dentists can get enough ‘food for thought’ for treating such cases on their own by using simple removable appliances. Additional reading/training may be needed to get to use the functional appliances with felicity.
Pulp therapy helps in preserving a pulpally involved primary tooth by eliminating bacteria and their products and ensures hermetic seal of the root canals so that the primary tooth can complete its function without harming the successor or affecting the health of the patient. A thorough understanding of the pulp morphology and root formation and resorption in primary teeth as well as different materials and techniques used is imperative for a successful pulp therapy. One of the major areas of continued research is in the area of finding obturating materials to suit the specific properties of these teeth. This article seeks to present a review of the major obturating materials and techniques with their modifications as well as their advantages and disadvantages.
Oral lichen planus (OLP) is a chronic mucosal condition commonly encountered in clinical dental practice. Lichen planus is believed to represent an abnormal immune response in which epithelial cells are recognized as foreign, secondary to changes in the antigenicity of the cell surface. It has various oral manifestations, the reticular form being the most common. The erosive and atrophic forms of OLP are less common, yet are most likely to cause symptoms. Topical corticosteroids constitute the mainstay of treatment for symptomatic lesions of OLP. Recalcitrant lesions can be treated with systemic steroids or other systemic medications. However, there is only weak evidence that these treatments are superior to placebo. Given reports of a slightly greater risk of squamous cell carcinoma developing in areas of erosive OLP, it is important for clinicians to maintain a high index of suspicion for all intraoral lichenoid lesions. Periodic follow-up of all patients with OLP is recommended.
In modern world, to spread the confusion and panic among the people terrorist can use biological weapon. In such Bioterrorism attack health professionals plays a key role. This paper reviews the historical aspect, definition, classification of bioterrorism agents and the role of dentistry in such catastrophic event.
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Sumanthini M, Malgaonkar MA. Management of non vital maxillary central incisors with open apex using Mineral Trioxide Aggregate apical plugs – Case report. J Contemp Dent 2011; 1 (2):40-43.
The case report describes the treatment of maxillary central incisors with open apex, due to apical root resorption, as a consequence of trauma experienced three years earlier. Open apices pose a challenge during endodontic treatment. Several materials and methods have been widely studied and tried in the past. Obtaining an adequate apical seal is of paramount importance regardless of the material or technique used. In the present case the involved teeth were treated nonsurgically using white Mineral Trioxide Aggregate (MTA) as an artificial apical barrier. The treated teeth were asymptomatic and the follow up clinical and radiographic examination showed healing with apparent regeneration of periradicular tissues. Extrusion of MTA beyond the root end was not an obstacle in the healing process. MTA can be considered an effective material to treat infected open apex teeth with large periapical lesions.
Ashvini M. Padhye,
Sudarshan G. Kadam
Factitious or self-induced injuries are inflicted based on habit, frequently associated with psychogenic background; related only in manner by which they are produced, bearing no particular anatomic, etiologic or microscopic similarities. The following case report attributes a suspicious periodontal lesion to self-induced injury.
Compound odontomas are considered as hamartomatous malformation rather than true neoplasms & are generally asymptomatic . The exact etiology is unknown and is often associated with the overretained deciduous teeth, most commonly in maxillary anterior region. In this case, multiple denticles or rudimentary teeth numbering 42 were enucleated from the mandibular symphysis region of 17 yr old female which makes this case rare and unusual. Evidence of concrescence, fusion, dilaceration were observed in the denticles enucleated, the size of which ranged from 2mm to 10mm.
Oral squamous cell carcinoma (OSCC) is a well known malignancy which accounts for more than 90% of all oral cancers. OSCC are malignant tumors that frequently invade bone and bone invasion is a common clinical problem. Bone invasion by oral squamous cell carcinoma may progress by either an infiltrative or an erosive histological pattern. The pattern of bone invasion co-relates with the clinical behavior of OSCC thus having a potential prognostic value. The present case report is of a 35-year- old female patient presenting with a lesion in the lower right buccal vestibule which was histopathologically confirmed as OSCC. The type of bony invasion was also assessed microscopically. The objective of this paper was to define the characteristics associated with each histological pattern of invasion and its significance when reviewing oral squamous cell carcinoma with mandibular invasion.