Screw loosening in angulation-correcting single implant restorations: A systematic review of in vitro studies

Pitman, Jeremy; Craenenbroeck, Maja Van; Glibert, Maarten; Christiaens, Véronique

doi:10.1016/j.prosdent.2022.08.003

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…Previous studies have shown that increased gingival height results in higher stresses on both the abutment and the screw (Bordin et al, 2019) along with lower RTVs (Siadat et al, 2015) as increased gingival height leads to increased crown to implant ratio. Even though it was nonsignificant, CFS had higher RTV values than CFA, which may be related to the angle between the screwdriver and the screw in CFA that resulted in a different preload value at the screw head (Opler et al, 2020; Pitman et al, 2022).…”

Section: Discussionmentioning

confidence: 97%

Effect of internal connection type and screw channel angle on the screw stability of anterior implant‐supported zirconia crowns

Çakmak

Güven

Dönmez

et al. 2023

Clinical Oral Implants Res

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ObjectivesTo investigate the effect of implant–abutment connection and screw channel angle on screw stability by comparing a newly introduced and an established connection, before and after cyclic loading.Materials and MethodsImplants (N = 44) with Torcfit (TF) or Crossfit (CF) connection were divided to be restored with a straight (CFS and TFS) or an angled screw access channel (CFA and TFA) titanium‐base abutment (n = 11). CFA and TFA received screw‐retained crowns, whereas CFS and TFS received hybrid zirconia abutments and cement‐retained crowns. The initial torque value (ITV) of each complex (ITVI) and removal torque value (RTV) after 24 h (RTVI) were measured. Screws were replaced with new ones, ITVs were recorded again (ITVF), and crowns were cyclically loaded (2.4 million cycles, 98 N) to measure RTVs again (RTVF). Percentage torque loss was calculated. Data were analyzed (α = 0.05).ResultsITVs were similar among groups (p ≥ .089). CF led to higher RTVs (p ≤ .002), while CFS had higher RTVI than CFA (p = .023). After 24 h, CFS had lower percentage torque loss than TF, while CFA had lower percentage torque loss than TFA (p ≤ .011). After cyclic loading, CF led to lower percentage torque (p < .001).ConclusionThe implant–abutment connection affected the removal torque values. However, no screw loosening occurred during cyclic loading, which indicated a stable connection for all groups. Screw access channel angle did not affect screw stability after cyclic loading.

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Section: Discussionmentioning

confidence: 97%

Effect of internal connection type and screw channel angle on the screw stability of anterior implant‐supported zirconia crowns

Çakmak

Güven

Dönmez

et al. 2023

Clinical Oral Implants Res

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“…Considering recent recommendations regarding the retention of implant‐supported single crowns, screw‐retained reconstructions are favored over cement‐retained restorations to prevent the risk of peri‐implant infections with possible residual cement surpluses (Sailer et al, 2022; Staubli et al, 2017; Wilson Jr., 2009). However, anatomical variations with undercuts, post‐extraction ridge alterations, insufficient bone volume, and natural angulation of the maxillary teeth hamper palatal positioning of the screw‐access hole and axial loading of the implant (Chappuis et al, 2013; Pitman et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…To overcome poor esthetic results due to an access hole on the vestibular surface, the concept of angulated screw channels (ASCs) for titanium implants was introduced in 2015 (Garcia‐Gazaui et al, 2015; Pitman et al, 2022; Rella et al, 2021). Depending on the system, ASCs allow an axis correction of up to 25° and shift of the screw‐access hole to the more favorable palatal position (Edmondson et al, 2022; Rella et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Influence of straight versus angulated screw channel titanium bases on failure loads of two‐piece ceramic and titanium implants restored with screw‐retained monolithic crowns: An in‐vitro study

Helal

Gierthmuehlen

Bonfante

et al. 2023

Clinical Oral Implants Res

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ObjectiveTo analyze the influence of titanium‐base (straight [SSC]/angulated‐screw‐channel [ASC]) on failure‐loads and bending‐moments of two‐piece ceramic and titanium–zirconium implants restored with monolithic‐zirconia crowns after fatigue.Materials and MethodsThirty‐two anterior monolithic‐screw‐retained zirconia crowns were divided into four groups (n = 8/group) according to the factors: (1) type of implant material: two‐piece titanium–zirconium implant (Ti–Zr; control‐group) versus two‐piece ceramic implant (CI; test‐group) and (2) type of titanium‐base: SSC (0° angle) versus ASC (25°). An intact implant was used for field emission gun‐scanning electronic microscopy (FEG‐SEM) characterization and Raman spectroscopy for phase analyses and residual stress quantification. All samples were exposed to fatigue with thermodynamic loading (1.2‐million‐cycles, 49 N, 1.6 Hz, 5–55°C) at a 30° angle. Surviving specimens were loaded until failure (SLF) and bending moments were recorded. Failed samples were examined using light microscope and SEM. Statistical analyses included ANOVA and Mann–Whitney U‐test.ResultsRaman‐spectroscopy revealed the presence of residual compressive stresses. FEG‐SEM revealed a roughened surface between threads and polished surface at the cervical‐collar of the ceramic implant. All samples survived fatigue and were free of complications. Mean bending‐moments (±SD) were: Ti‐Zr‐0: 241 ± 45 N cm, Ti‐Zr‐25: 303 ± 86 N cm, CI‐0: 326 ± 58 N cm, CI‐25: 434 ± 71 N cm. Titanium‐base and implant‐material had significant effects in favor of ASC titanium bases (p = .001) and ceramic‐implants (p < .001). Failure analysis after SLF revealed severe fractures in ceramic implants, whereas titanium implants were restricted to plastic deformation.ConclusionsCeramic and titanium implants exhibited high reliability after fatigue, with no failures. From a mechanical perspective, titanium bases with ASC can be recommended for both ceramic and titanium implants and are safe for clinical application.

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Longevity of different abutments placed on narrow diameter implants: Assessment of structural damage and loosening

Lenz,

Santos,

Griggs

et al. 2024

Dental Materials

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Screw loosening in angulation-correcting single implant restorations: A systematic review of in vitro studies

Cited by 6 publications

References 22 publications

Effect of internal connection type and screw channel angle on the screw stability of anterior implant‐supported zirconia crowns

Effect of internal connection type and screw channel angle on the screw stability of anterior implant‐supported zirconia crowns

Influence of straight versus angulated screw channel titanium bases on failure loads of two‐piece ceramic and titanium implants restored with screw‐retained monolithic crowns: An in‐vitro study

Longevity of different abutments placed on narrow diameter implants: Assessment of structural damage and loosening

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