Aim: This study was conducted to evaluate radiographically the effect of nano-hybrid composite resin teeth on mandibular residual ridge using cone beam computerized tomography (CBCT). A comparative study. Materials and Methods: Twelve completely edentulous male patients were randomly divided into two groups according to the artificial tooth material used in complete denture construction. One group received complete dentures with nano-hybrid composite resin teeth and the other group received complete dentures with cross-linked acrylic resin teeth. CBCT was taken at the delivery, 6 months and 12 months follow-up appointments. The evaluation was done for height and width changes of the mandibular residual alveolar ridge at different anatomical sites either in the anterior or posterior part of the mandible. Results: Analysis was done by using two-tailed t-test revealed that increase in amount of bone loss in both groups which is in favor to patients wearing dentures with nanohybrid composite resin teeth, with no statistically significant difference between the two groups. Conclusion: Despite of introduction of new denture tooth material as nanohybrid composite resin teeth, the cross-linked acrylic resin teeth still considered the gold standard denture teeth regarding the degree of occlusal force transmission and preservation of residual alveolar ridge.
Introduction: The implant supported overdentures offered better chewing and masticatory functions. Locator attachment has more advantages than other attachment types. Aim: The aim of the study was to compare radio-graphically the effect of implant locator's height on peri-implant bone height and density in mandibular over-denture. Patients and method: Twelve completely edentulous male patients had received conventional complete maxillary dentures and mandibular overdenture that retained by two implants that were inserted in the canine region by the help of CAD/CAM based surgical guides. The patients were divided randomly into two groups. Group I: the patients were received locator abutment with 1mm in height. Group II: the patients were received locator abutment with 3mm in height, a series of cone beam radiographs were taken at 0, 6, 12 and 18 months starting from the first day of lower over denture installation, peri-implant bone changes regarding height and density were estimated. Results: It was found that the mean marginal bone loss measurements were relatively higher for group I than group II with non-statistical significant difference. The average difference in bone density measurements around the implants for both groups showing initial increase followed by marked decrease through the follow up periods. Conclusion: locator height has an effect on peri-implant bone height, bone density.
Introduction:The locator attachment has been widely and successfully used to support dentures has dual retention and is available in different heights with different retention values; in addition, their repair and replacement are quick and straight forward. Aim: The aim of this study was to compare clinically and radio graphically the biological effect of two different locator heights on peri-implant bone width and probing depth in mandibular implant overdenture wearers. Materials and methods: Conventional complete dentures were constructed for twelve completely edentulous male patients, chosen from Out-clinic of faculty of dentistry Suez Canal University. Two implant were inserted in the lower cusped region then the patients divided randomly into two groups Group A(GA): Six patients received implant retained over denture with 1mm locator height. Group B (GB): Six patients received implant retained over denture with 3mm locator height, the follow up both clinically and radiography were taken at 0, 6, 12 and 18 months starting from the first day of over denture attachment pick up. Peri-implant bone width and probing depth were estimated through the evaluation periods. Results: It was found that the reduction in the peri-implant alveolar buccolingual width and probing depth around the implants were higher in GA than GB at all follow up periods, except for the last follow up period. Conclusion: The locator height has a biological effect on bone width and probing depth as the higher locator height the more preservation of peri-implant bone.
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