Influence of the abutment height and connection timing in early peri‐implant marginal bone changes: A prospective randomized clinical trial

Abstract

Aim The aim of this study was to compare the influence of the abutment height and insertion timing on early marginal bone loss (MBL) in posterior mandibular partial implant‐supported restorations. Material and methods The study was planned as a prospective, randomized, controlled parallel group including subjects in need of at least two implants for the restoration of an edentulous posterior mandibular area. The patients were allocated into Groups A (implants immediately connected to 2‐mm height abutments), B (immediately connected 1‐mm height abutments), and C (2‐mm abutments were inserted in a second‐stage surgery). Each subject was placed in a 1‐year follow‐up program, including examination assessment of various soft tissue and bone‐level parameters. Results A total of thirty‐three patients, including sixty‐eight implants, were enrolled in this study. One implant was lost on group C after the first month of healing. A mean MBL change of 0.719 ± 0.361, 0.651 ± 0.379, and 0.754 ± 0.672 mm was computed for groups A, B, and C, respectively, with no significant differences found. The early MBL at T1 was an independent predictor variable for the marginal bone alterations that were assessed at T3 (p < 0.001). Conclusion The first‐month MBL variation is a predictor factor of the bone alterations that might occur after 1 year of treatment. The early connection of final prosthetic abutments with distinct heights does not seem to reduce the 1‐year MBL rate when compared with traditional treatment protocols.

Biological width establishment around dental implants is influenced by abutment height irrespective of vertical mucosal thickness: A cluster randomized controlled trial

“…Limited but noticeable marginal bone loss occurred in the first period ( T 1 – T 0 ) before loading, as recently described elsewhere (Borges, Leitao, Pereira, Carvalho, & Galindo‐Moreno, ). MBL was similar in the 4 groups (A1, A3, B1, B3) during this period and is probably due to the remodeling process caused by surgical trauma related to implant insertion and uncovering, and to the two healing abutment disconnections performed for prosthetic reasons (impression taking and subsequent try‐in of the crown) (Koutouzis, Gholami, Reynolds, Lundgren, & Kotsakis, ; Tatarakis et al, ).…”

Implant vs abutment level connection in implant supported screw‐retained fixed partial dentures with cobalt‐chrome framework: 1‐year interim results of a randomized clinical study

“…During the first year, periimplant bone remodeling could be influenced by several factors such as surgical procedures, numbers of surgical stages, repetitive disconnections during prosthetic procedures, type of implant connection and the establishment of the supracrestal tissue. [33][34][35] According to present findings, it was observed better results in marginal bone maintenance and soft-tissue parameters around AL Concerning the soft tissue, the IL group presented a significant worsening in BoP and PPD with time, while there was a significant improvement in the AL group. After 6 months and 1 year, the difference between the groups resulted to be statistically significant.…”

“…A greater amount of MBL is reported to occur in the early stage of healing. During the first year, periimplant bone remodeling could be influenced by several factors such as surgical procedures, numbers of surgical stages, repetitive disconnections during prosthetic procedures, type of implant connection and the establishment of the supra‐crestal tissue …”

Influence of abutment disconnection on peri‐implant marginal bone loss: A randomized clinical trial

“…More recently, another retrospective study observed an inverse relationship between abutment height and peri‐implant marginal bone loss and estimated a height of 2.5 mm as adequate to neutralize the bone loss (Spinato, Galindo‐Moreno, Bernardello, & Zaffe, ). However, a prospective study failed to detect differences between 1 and 2 mm height abutments over a 1‐year follow‐up period (Borges, Leitao, Pereira, Carvalho, & Galindo‐Moreno, ).…”

“…2018). However, a prospective study failed to detect differences between 1 and 2 mm height abutments over a 1-year follow-up period (Borges, Leitao, Pereira, Carvalho, & Galindo-Moreno, 2018).…”