Fracture Strength of Implant Screw-Retained All-Ceramic Crowns with the Use of the Angulated Screw Channel: A Pilot Study

Drew, Alexander P.; Randi, Anthony; DiPede, Louis; Luke, Allyn

doi:10.11607/prd.3952

Cited by 18 publications

(25 citation statements)

References 10 publications

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“…In a two‐piece zirconia custom abutment, loading forces might be greater in the area where the abutment connects to the implant and where the abutment is thinner. The results of this study confirm those of previous ones related to the clinical performance of two‐piece zirconia custom abutments 11 , 29 . In the design and fabrication of CAD/CAM one‐piece or two‐piece zirconia custom abutments this thickness is controlled by the manufacturer.…”

Section: Discussionsupporting

confidence: 87%

“…Comparable with results described by Drew and Zandaparsa, the mode of failure of all the samples was fracture at the apical segment of the ceramic piece, with no visible damage or plastic deformation of the titanium sleeve, abutment screw, or implant analog 11,29 . In previous studies, 25,28 one‐piece zirconia custom abutments demonstrated lower bending forces in the area of the apical hexagon, leading to the lowest mean fracture load when compared with two‐piece zirconia custom abutments.…”

Section: Discussionsupporting

confidence: 79%

“…Similar to other in vitro studies, implant analogs were secured in autopolymerizing acrylic resin 11,20,25,30 . However in the future, new results could be obtained from using another material with a modulus of elasticity and volume comparable to human alveolar bone.…”

Section: Discussionmentioning

confidence: 76%

“…The thickness for two‐piece zirconia custom abutments in this area ranges between 0.40 and 0.60 mm. Drew also reported this area to be a possible weak point of 0.432 mm in thickness 11 . The angulation of the screw channel, however, had a statistically significant and negative influence on the strength of the two‐piece zirconia custom abutment.…”

Section: Discussionmentioning

confidence: 99%

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Influence of Screw Channel Angulation on the Fracture Resistance of Zirconia Abutments: An In Vitro Study

Garcia‐Hammaker

Saglik

Sierraalta

et al. 2020

Journal of Prosthodontics

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Purpose The aim of this study was to investigate the effect of implant screw channel angulation on the fracture resistance of zirconia abutments without artificial aging. Materials and Methods Ten implant replicas were embedded in a jig of autopolymerizing acrylic resin. Using a surveyor and a metallic platform, the implant replicas were mounted centrally and with an angulation of 30°. A maxillary left central incisor crown was fabricated from pattern resin and scanned. The digital design of a monolithic zirconia implant abutment‐crown was completed using a 3D imaging software. For all specimens of this group (ASC25), the screw channel was positioned at 25° to the lingual. Following fabrication, the samples were attached onto the embedded implant replicas and manually torqued to 35 Ncm as recommended by the manufacturer. The monolithic zirconia implant abutment‐crowns were mounted in a metallic platform, positioned perpendicular to the indenter, and subjected to loading until failure. Crosshead speed was set at 0.5 mm/min for the universal testing machine. Data from a similar in vitro study where straight zirconia custom abutments (ASC0) were subjected to static load until failure was used as a control group. An unpaired Student's t‐test was used to determine if fracture resistance based on load at failure and maximum load in each group were significantly different from each other (ASC25 vs ASC0). Statistical significance level was inferred at p ≤ 0.05 Results Group ASC25 fractured at a mean (SD) load of 215.49 (47.10) N and a mean (SD) maximum load of 420.50 (17.18) N. Group ASC0 fractured at a mean (SD) load of 534.04 (133.77) N and a mean (SD) maximum load of 762.69 (109.59) N. The difference was statistically significant for both mean load and mean maximum load at failure (p ≤ 0.05). The survival rate of 0° zirconia abutments was significantly higher than that of 25° ASC zirconia abutments. Conclusions Within the limitations of this in vitro study the mean fracture load was significantly higher in the group with a straight channel angulation.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

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Influence of Screw Channel Angulation on the Fracture Resistance of Zirconia Abutments: An In Vitro Study

Garcia‐Hammaker

Saglik

Sierraalta

et al. 2020

Journal of Prosthodontics

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“…This contour can put excess pressure on these tissues, hence causing recession. Also, ASC abutments have limitations such as screw preload or torque, screw stripping, and abutment fracture beyond an angle correction of 15° 30,31 …”

Section: Discussionmentioning

confidence: 99%

Managing restorative space, color matching, and tooth replacement with a novel implant through interdisciplinary treatment: A case report of partial anodontia and malformed teeth in the esthetic zone

Chu

Sarnachiaro²,

Mieleszko³

et al. 2020

J Esthet Restor Dent

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A case report of tooth agenesis and excessive intraarch space due to tooth size discrepancies and malformed teeth is presented. Interdisciplinary treatment including orthodontics, implant surgery, prosthodontics, and laboratory fabrication with dissimilar restoration and material types was used to accomplish an esthetic and functional outcome. Proper diagnosis of individual tooth width and proportion were key elements in treatment. Clinical Significance Knowledge and understanding of the relationships of the mandibular to maxillary anterior teeth and shade management of dissimilar restoration types will allow the interdisciplinary team to achieve the desired esthetic restorative result.

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Effect of cyclic loading on reverse torque values of angled screw channel systems

Mulla

Seghi

Johnston

et al. 2022

The Journal of Prosthetic Dentistry

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Fracture Strength of Implant Screw-Retained All-Ceramic Crowns with the Use of the Angulated Screw Channel: A Pilot Study

Cited by 18 publications

References 10 publications

Influence of Screw Channel Angulation on the Fracture Resistance of Zirconia Abutments: An In Vitro Study

Influence of Screw Channel Angulation on the Fracture Resistance of Zirconia Abutments: An In Vitro Study

Managing restorative space, color matching, and tooth replacement with a novel implant through interdisciplinary treatment: A case report of partial anodontia and malformed teeth in the esthetic zone

Effect of cyclic loading on reverse torque values of angled screw channel systems

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