Peri-implant marginal bone loss based on the thread size of implant neck area : a 1-year prospective study after loading

Abstract

[한글]

[영문]The aim of this investigation was to compare the amount of marginal bone loss between two types of implants, both of which have threads up to the top of the neck area, but one with micro-threads and the other with macro-threads, and to analyze the effect the two different sized threads have on marginal bone, clinically.The two groups of implants used in this study differ in the thread size of the implant neck area. One(Group A) has bigger size neck thread of 0.35mm depth and 0.6mm pitch, and the other(Group B) has smaller size neck thread of 0.15mm depth and 0.3mm pitch in the 3.0mm neck area. Implants from each group were placed adjacent to each other in the partially edentulous premolar and molar area of 13 patients. In order to minimize the influence the condition of the peri-implant mucosa and plaque accumulation may have on bone loss, adequate oral hygiene instructions were given and periodic clinical examinations of peri-implant mucosa and professional plaque control were performed. Bone loss around each implant was analyzed after one year of functional loading.The average bone loss in Group A was 0.192 ± 0.131mm, and in Group B was 0.147 ± 0.156mm, after 1-year of functional loading. Implants with micro-threads had slightly less marginal bone loss. However, there was no significant difference statistically(p=0.414). None of the implants had any complication during the observation period. And there was no significant difference statistically in mPI and mBI of both study groups.According to present study, it seems that the macro-threads in the neck portion of implant have similar ability for marginal bone preservation compared with micro-threads. However, this study has the limitation of study design.