Effects of different torque levels on the implant-abutment interface in a conical internal connection

Abstract

The fit of the implant-abutment interface was assessed by the metallographic technique and by scanning electron microscopy (SEM), using solid abutment types at different torque levels. Forty Morse taper connections and forty solid abutments were used at different torque levels (repeated after 10 minutes) in the following groups (n = 10): 25 Ncm (group g1), 30 Ncm (group g2), 35 Ncm (group g3), and 40 Ncm (group g4). The samples were embedded in a metallographic resin, sectioned lengthwise, and polished. SEM images were used to measure the linear contacts and the fits between abutments and the internal walls of the implant. The overall mean gap and standard deviation were as follows: 9.0 ± 1.36 µm for group g1, 7.9 ± 2.81 µm for group g2, 2.0 ± 0.76 µm for group g3, and 0.3 ± 0.40 µm for group g4. A significant difference was observed in the average fit values between the groups (p < 0.05). The linear area of contact between the abutment and the implant increased as torque augmented. This study demonstrated that higher insertion torque values in a conical internal connection increase the fit (contact) of the implant-abutment interface.

Alveolar Ridge Reconstruction with Titanium Meshes and Simultaneous Implant Placement: A Retrospective, Multicenter Clinical Study

“…The implants used in this study, in fact, present a conical connection (10°) combined with an internal hexagon, characterized by high mechanical stability [28–30]. The conical implant-abutment connections can guarantee high stability, as demonstrated by several recent works [32–34]. In addition, these implants possess an integrated platform switching [29, 30]; this is useful to maintain and preserve the tissue volumes, as previously reported [35–37]; accordingly, a minimal bone resorption was found around the implants, with a mean overall peri-implant marginal bone loss of 0.40 mm (±0.20) 4 months after the implant placement; this bone loss increased to 0.43 mm (±0.15) at the 1-year follow-up control.…”

The Impact of Implant–Abutment Connection on Clinical Outcomes and Microbial Colonization: A Narrative Review

“…Finally, we can say that the conical implant connection system is more favorable insofar as the maintenance of the marginal bone is concerned [7,22,[26][27][28][29][30][31].…”

Impact of implant insertion torque on success of implant-an evidence based review

“…11,30 Thus, several studies have been done to determine the association between insertion torque and bone related changes and have concluded a positive correlation between the two. [10][11][12][13][14][15][16][17][18][19][20] The relation between insertion torque, osseointegration and implant success-an evidence based overview: Successful osseointegration is an outcome of good quality of primary stability which in turn depends on insertion torque. [31][32][33] Osseointegration is a structural and functional association between living bone and the loading implant interface, is crucial for implant stability, and is well thought-out a requirement for implant loading and clinical success of end osseous dental implants in long run.…”

“…Few studies have indicated insertion torque near the range of 35 Ncm to be satisfactory while some found no bone damage up to 176 Ncm. 3,10,16,17 However, impact of high and low insertion torque depends on various parameters. 18 In this review article we will discuss the effect of high insertion torque and bone related changes which ultimately decide the success and failure of an implant.…”