hrvatski

Upotreba metode objektnog rastera za testiranje upotrebe kratkih mini implantata za retenciju donje pokrovne proteze

Introduction: Insertion of short mini dental implants (short MDIs) could be the new treatment modality for cases of extreme mandibular ridge resorption. Aim was to test the behavior of dental implants being both, slim and short (short MDIs) for complete over-denture (OD) retention by digital image correlation (DIC).Materials and methods: Based on CBCT scans of patients with extremely atrophied man-dible (interforaminal height < 10 mm), six identical models of an average extremely re-sorbed mandible were virtually built and 3D printed. In each model, four MDIs (6, 8 or 10 mm long ; 2 or 2.5 mm wide) were inserted interforaminally and CoCr reinforced over-dentures (OD) were loaded using a testing machine with 150N loads applied on the den-ture molar region bilaterally, unilaterally and the on anterior region. The precise measure-ment of von Mises Strain and vertical displacement was conducted using the DIC method. Results: Von Mises Strain showed very low values on all models ranging from 0.46 % to 1.23 %, with the highest values observed at the zone of bone-denture contact and at sites closer to the force application. The DIC showed, in all loading stages, identical spreading direction with the maximum strain value within the bone-denture contact line. The same mean value of vertical displacement was measured for all three types of loading, amount-ing to 0.2 mm on all the models. It followed that the vertical displacement was the result of denture subsidence due to “o-ring” elasticity.Conclusion: DIC has demonstrated a low level of uniformly distributed strain that allows the use of short MDIs for the retention and stabilization of mandibular OD.

extremely atrophied mandible ; mandibular overdenture ; short one-piece mini-implants ; digital image correlation

nije evidentirano

engleski

Digital image correlation analysis of mandibular overdenture retained by four short mini dental implants

Introduction: Insertion of short mini dental implants (short MDIs) could be the new treatment modality for cases of extreme mandibular ridge resorption. Aim was to test the behavior of dental implants being both, slim and short (short MDIs) for complete over-denture (OD) retention by digital image correlation (DIC).Materials and methods: Based on CBCT scans of patients with extremely atrophied man-dible (interforaminal height < 10 mm), six identical models of an average extremely re-sorbed mandible were virtually built and 3D printed. In each model, four MDIs (6, 8 or 10 mm long ; 2 or 2.5 mm wide) were inserted interforaminally and CoCr reinforced over-dentures (OD) were loaded using a testing machine with 150N loads applied on the den-ture molar region bilaterally, unilaterally and the on anterior region. The precise measure-ment of von Mises Strain and vertical displacement was conducted using the DIC method. Results: Von Mises Strain showed very low values on all models ranging from 0.46 % to 1.23 %, with the highest values observed at the zone of bone-denture contact and at sites closer to the force application. The DIC showed, in all loading stages, identical spreading direction with the maximum strain value within the bone-denture contact line. The same mean value of vertical displacement was measured for all three types of loading, amount-ing to 0.2 mm on all the models. It followed that the vertical displacement was the result of denture subsidence due to “o-ring” elasticity.Conclusion: DIC has demonstrated a low level of uniformly distributed strain that allows the use of short MDIs for the retention and stabilization of mandibular OD.

extremely atrophied mandible ; mandibular overdenture ; short one-piece mini-implants ; digital image correlation

nije evidentirano