Photoelastic analysis to compare implant-retained and conventional obturator dentures

Abstract

Abstract. The use of photoelastic analysis contributes to the rehabilitation of patients with oral-sinus-nasal sequelae, which in turn affect important functions such as chewing, swallowing, and speech. The prosthetic rehabilitation with implant-retained dentures is a suitable treatment option. The purpose of this study was to verify, by using a photoelastic analysis, the stress distribution in implant-retained palatal obturator dentures (relined or not) associated with different attachment systems (O-ring, bar-clip, and bar-clip associated with distally placed O-rings). Two photoelastic models were obtained from an experimental maxillary cast presenting an oral-nasal communication.One model had two 13-mm length implants placed on the left region. A total of eight colorless maxillary obturators were fabricated and subsequently four of them were relined with soft silicone soft, and three had attachment systems associated. The assembly (model/attachment system/prosthesis) was positioned in a circular polariscope and a 100-N load was applied at 10 mm∕s. The results showed that the denture relining influenced the distribution and amount of stress on the models. The O-ring group displayed the lowest stress levels, followed by bar-clip system associated with distally placed O-rings and bar-clip groups.

Stress analysis in oral obturator prostheses: imaging photoelastic

“…These results corroborate with some studies [14][15][16] which consider that the O-ring attachment system (Fig. 2) transfers less stress to the implants in comparison to the bar-clip system (Fig.…”

Photoelastic Stress Analysis in Prosthetic Implants of Different Diameters: Mini, Narrow, Standard or Wide

“…Furthermore, previous studies [4,5,[12][13][14] reported that the use of narrow-diameter implants may reduce the osseointegration surface and consequently affect the biomechanical behavior of implants and prosthetic components. Also, wider diameter implants exhibited greater mechanical resistance.…”

Stress analysis in oral obturator prostheses over parallel and tilted implants: photoelastic imaging

“…Without this technique, these regions would receive shorter implants or would require bone graft, increasing the complexity, time and cost of the treatment. [1][2][3] Allied to implants, different types of attachment systems are usually indicated for improving the retention and stability of overdentures, [4][5][6][7][8] such as ball systems, magnet, and bars, and it is also possible to associate them with one another. 4,5,[7][8][9][10][11] The dental literature has shown many studies that approach the distribution of forces in order to collect better background information for planning of overdentures.…”

“…4,5,[7][8][9][10][11] The dental literature has shown many studies that approach the distribution of forces in order to collect better background information for planning of overdentures. 4,5,[7][8][9]12 A photoelasticity method through images has been widely applied in dentistry and allows a direct observation of stress distribution on structures, based on the ability of certain transparent materials to display color standards named isochromatic fringes when they are loaded and observed through a polarized light. 4,5,7,13 Thereby, this study aimed to evaluate the stress distribution through the photoelastic method in implant-retained palatal obturators over two parallel implants and one tilted using different attachment systems and conventional obturator (without implants).…”

“…[1][2][3] Allied to implants, different types of attachment systems are usually indicated for improving the retention and stability of overdentures, [4][5][6][7][8] such as ball systems, magnet, and bars, and it is also possible to associate them with one another. 4,5,[7][8][9][10][11] The dental literature has shown many studies that approach the distribution of forces in order to collect better background information for planning of overdentures. 4,5,[7][8][9]12 A photoelasticity method through images has been widely applied in dentistry and allows a direct observation of stress distribution on structures, based on the ability of certain transparent materials to display color standards named isochromatic fringes when they are loaded and observed through a polarized light.…”