5 Year Randomized Multicenter Clinical Trial On Single Dental Implants Placed In The Midline Of The Edentulous Mandible

Author : Henny Meijer
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (116 download)

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Download or read book A 5-year Randomized Comparison of 6 Mm with 11 Mm Implant Length, Diameter 4.0mm written by Henny Meijer and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Background:The use of short implants expands treatment options and reduces the need for significant bone augmentation procedures in caseswith diminished bone height in edentulous areas. Recent clinical studies suggest similar survival rates to longer implants. (Rossi et al2016, 2018, Pieri et al 2017 and Naeni et al 2018). Short implants are most often placed in compromised bone situations. The presentstudy compares test and control implants under the same conditions.Aim/Hypothesis:The aim of this multicentre randomized controlled study was to compare the clinical performance of implants with a length of 6 mmwith an 11mm control group, when using early loading in the (pre)molar region in both maxilla and mandible. This paper will presentthe five-year data of the study.Materials and Methods:Six study sites were involved in this international randomized controlled multi-center study. To be included, patients needed to be:between the ages of 20 to 70 years at enrolment, a history of edentulism in the study area for at least 4 months, adjacent teeth tohave natural roots, presence of an opposing dentition and sufficient bone volume to accommodate at least an 11 mm implant.Ninety-five patients with two or three teeth missing in the premolar and molar regions were included. Each patient was randomlyallocated to treatment groups to receive implants with a length of either 6 mm or 11 mm (OsseoSpeedTM 4.0 S), Astra Tech ImplantSystem, Dentsply Sirona Implants. Implants were placed using a one-stage surgical procedure, with loading after 6-7 weeks andrestored with a screw-retained fixed prosthesis. Clinical and radiographic examinations were performed pre-operatively, post-surgery,loading, 6 and 12 months after restoration placement, and annually thereafter.Results:In total 209 implants were inserted (63% mandible, 37% maxilla). From loading to the 5-year follow-up, a mean marginal bone levelchange of 0.02 u00b10.52 mm (bone gain) in the 6 mm group and -0.18 u00b11.05 mm (bone loss) in the 11 mm group was found (P-value:0.923; Mann-Whitney U test). Presence of bleeding on probing was detected around 44% of the 6 mm implants and 33% of the 11mm implants. Probing pocket depths were generally shallow, with a mean of 2.57 u00b10.75 mm in the 6 mm group and 2.91 u00b11.53 mm inthe 11 mm group at time of the 5-year follow-up. Two 6 mm implants failed to integrate (early loss) and one was lost before the 2-yearevaluation. In the 11mm group 1 implant was lost 4 weeks after loading due to bone loss. Besides the loss of these four implants, nocomplications were recorded in the two treatment groups during the five years in use. This give a cumulative survival rate of 93.6% forthe subjects with 6 mm implants and 97.8% for the control group, five years post loading.Conclusions and Clinical Implications:The final data from this randomized multi-center study with a 5-year follow-up indicates that treatment with the Astra Tech ImplantsSystem short implant (6 mm) is as reliable as treatment with implants of standard length (11 mm). This provides a good treatmentoption in situations with limited bone height in the premolar and molar regions.