Loosening of the fixing screw in single implant crowns: predisposing factors, prevention and treatment options

Kourtis, Stefanos; Damanaki, M; Kaitatzidou, Sofia; Kaitatzidou, Aikaterini; Roussou, Vasiliki

doi:10.1111/jerd.12303

Cited by 66 publications

(64 citation statements)

References 78 publications

(170 reference statements)

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“…6,7 A number of studies have reported screw loosening is one of the major complications of dental implant therapy. 6,7 A number of studies have reported screw loosening is one of the major complications of dental implant therapy.…”

mentioning

confidence: 99%

Effect of different maintenance time of torque application on detorque values of abutment screws in full‐arch implant‐supported fixed prostheses

Al-Otaibi

Alfouzan

Al-Mufleh

et al. 2018

Clin Implant Dent Rel Res

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The application of 35 N-cm for different maintenance time of torque application on implant abutment screw did not appear to affect the detorque value in a multiple implant-supported fixed prosthesis. Maintaining the torque for prolonged time (10 seconds or 30 seconds) was not significantly associated with higher preload than instant torque application in full-arch implant-supported prosthesis.

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mentioning

confidence: 99%

Effect of different maintenance time of torque application on detorque values of abutment screws in full‐arch implant‐supported fixed prostheses

Al-Otaibi

Alfouzan

Al-Mufleh

et al. 2018

Clin Implant Dent Rel Res

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“…With respect to restoration designs, the splinted crown greatly reduced the screw loosening ratio compared to single crown. Factors that affect the screw loosening included: the implant‐abutment connection, cantilevers, the type of restoration and para‐functional habits . Bakaeen et al regarded that the screw loosening might be an early warning sign of biomechanical design problems or occlusal overload .…”

Section: Discussionmentioning

confidence: 99%

“…Based on this outcome, we speculate that bone augmentation procedure screw loosening included: the implant-abutment connection, cantilevers, the type of restoration and para-functional habits. 40 Bakaeen et al regarded that the screw loosening might be an early warning sign of biomechanical design problems or occlusal overload. 41 Timely examination to tighten screws could recover the normal use for patients.…”

Section: Discussionmentioning

confidence: 99%

Risk factors and reoperative survival rate of failed narrow‐diameter implants in the maxillary anterior region

Yang

Chen

Gao

et al. 2019

Clin Implant Dent Rel Res

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Background Narrow‐diameter implants (NDIs) have been proposed to address the dilemma of implant installation in cases of insufficient bone volume. However, the potential risk factors of failed NDIs, and whether reimplants with reliable efficacy are still controversial. Purpose This study aimed to evaluate the survival/success rate of NDIs in the maxillary anterior region and that of reimplants at the same site, as well as to explore the potential risk factors of original and replaced implants. Materials and Methods From January 2015 to April 2019, patients receiving NDIs in the anterior maxilla were enrolled in the present study. Multiple variables were assessed to exploit the risk factor of failed NDIs, including age, sex, implant sites, length, surface characteristics, and healing abutment designs. The relationship between bone augmentation and the number of missing teeth was assessed. For failed NDIs, the reasons for NDIs removal and marginal bone loss (MBL) were analyzed. The details and outcomes of reimplants were evaluated. Results Cumulative survival rates (CSRs) and success rates of 1095 NDIs installed in 835 patients were 96.99% and 96.51%, respectively. In total, 33 of these NDIs failed. TiUnite (TU) surface was a risk factor and it affected the success rate (92.56%) and CSR (92.4%) of NDIs (P < .001). The single NDIs with bone augmentation have lower failure rate. The average MBL for 33 failed NDIs was 1.92 ± 1.91 mm. Additionally, 22 patients with 23 NDIs accepted reimplantation of previously failed NDIs, and the success rate of reimplants was 95.65%. Conclusions Surface characteristic (TU surface) was a risk factor for failure of NDIs in the maxillary anterior region. Bone augmentation simultaneously performed during NDIs implantation was favorable for a single missing tooth. As an alternative plan, the reimplantation of failed NDIs was reliable and stable after successful bone reconstruction.

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“…Cement‐retained restorations indicate more serious biological complications such as a more than 2 mm bone loss, while screw‐retained restorations display more technical problems such as screw loosening . Although screw loosening may occur in both types of restoration, screw‐retained restorations allow easy screw tightening, retrievability, and repair . Consequently, screw‐retained restorations seem to be more desirable than cement‐retained restorations …”

Section: Introductionmentioning

confidence: 99%

“…11 Although screw loosening may occur in both types of restoration, screw-retained restorations allow easy screw tightening, retrievability, and repair. 12 Consequently, screwretained restorations seem to be more desirable than cementretained restorations. 11 Several methods are proposed to facilitate the retrieval of cement-retained implant-supported restorations such as staining of the occlusal surface, 13 digital photography, 14 three-dimensional radiography, 15 and temporary cementation.…”

Section: Introductionmentioning

confidence: 99%

Effect of screw access hole design on the fracture resistance of implant‐supported zirconia‐based restorations

Saboury

Mahshid

Tabatabaian

et al. 2018

J Esthet Restor Dent

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Objective To evaluate the effect of screw access hole design on the fracture resistance of cement‐retained implant‐supported zirconia‐based restorations with screw access holes. Materials and Methods Thirty cement‐retained implant‐supported zirconia‐based molar crown specimens were fabricated. The specimens were divided into 3 groups of 10: without access holes (C), with screw access holes (S), and with screw access holes accompanied with a surrounding zirconia wall (W). The veneering ceramic thickness was 0.8 mm in all groups. Implants were vertically mounted in a metal block. Abutments were screwed on the implants and the specimens were cemented to the abutments. A universal testing machine applied compressive forces to the specimens until fracture. Fracture resistance values of the specimens were measured. One‐way analysis of variance (ANOVA) and Tukey HSD tests were used to analyze data (P < .05). Results The mean fracture resistance values were 5794.85 N for C, 2691.48 N for S, and 3878.06 N for W. The screw access hole design significantly affected the fracture resistance (P < .0001). Significant differences were found between C and S (P < .001), C and W (P < .001), and S and W (P = .026). Conclusions The screw access hole decreased the fracture resistance. A surrounding zirconia wall for the screw access hole increased the fracture resistance. Clinical Significance Screw access hole design may affect the fracture resistance of cement‐retained implant‐supported zirconia‐based restorations with screw access holes. This study introduced a screw access hole design to improve the fracture resistance of these restorations.

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Loosening of the fixing screw in single implant crowns: predisposing factors, prevention and treatment options

Cited by 66 publications

References 78 publications

Effect of different maintenance time of torque application on detorque values of abutment screws in full‐arch implant‐supported fixed prostheses

Effect of different maintenance time of torque application on detorque values of abutment screws in full‐arch implant‐supported fixed prostheses

Risk factors and reoperative survival rate of failed narrow‐diameter implants in the maxillary anterior region

Effect of screw access hole design on the fracture resistance of implant‐supported zirconia‐based restorations

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