Precision of fit between implant impression coping and implant replica pairs for three implant systems

Nicoll, Roxanna J.; Sun, Albert Y.T.; Haney, Stephan J; Türkyilmaz, Ilser

doi:10.1016/s0022-3913(13)60008-6

Cited by 20 publications

(12 citation statements)

References 17 publications

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“…Prior work has demonstrated that greater dimensional variation in the machining tolerances during manufacturing produces a more asymmetric connection (Binion, 1996b;Nicoll et al, 2013). Machining tolerances in implant dentistry have been reported in the literature to range from 1 to 120 μm (do Nascimento et al, 2012;Ma et al, 1997;Nicoll et al, 2013), representing a wide variability that influences the fit of prosthetic components and the mechanical stability of the entire implant system (Binion, 1996b;Nicoll et al, 2013). To understand the effect of loading on implant systems, internal connection implant systems were exposed to rotational, vertical, and horizontal forces.…”

Section: Discussionmentioning

confidence: 99%

In vitro assessment of connection strength and stability of internal implant-abutment connections

Kofron

Carstens

Cong

et al. 2019

Clinical Biomechanics

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Background: Various connections have been machined to improve the fit between the dental abutment and implant. In vivo, the instability created by imprecisely fitting components can cause soft tissue irritation and bacterial colonization of the implant system. The aim of this study was to quantify abutment stability under in vitro force applications. Methods: Abutment stability and fit were quantitatively measured after application of rotational, vertical, and horizontal forces. Findings: The abutment connection held by friction (Friction-Fit) was the only group to have 0°angular rotation. A significantly greater vertical force was required to pull the abutment from the implant for the Friction-Fit connection as compared to all other experimental groups. The abutment connection held by a mechanically locking friction-fit with four grooves (CrossFit) and Friction-Fit demonstrated significantly lower lateral movement as compared to all other connections. The remaining connections evaluated included two hexagon connections that rely on screw placement for abutment fit (Conical + Hex #1 and Conical + Hex #2), one connection with protruding slots to align with recessed channels inside the implant (Conical + 6 Indexing Slots), and an internal connection that allows for abutment indexing every 120°(Internal Tri-Channel). Interpretation: Internal connection geometry influenced the degree of abutment movement. Friction-Fit and CrossFit connections exhibited the lowest rotational and horizontal motions. Significant differences were found between Friction-Fit and CrossFit following the application of a vertical force, with the Friction-Fit requiring a significantly greater pull force to separate the abutment from the implant.

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Section: Discussionmentioning

confidence: 99%

In vitro assessment of connection strength and stability of internal implant-abutment connections

Kofron

Carstens

Cong

et al. 2019

Clinical Biomechanics

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“…In a clinical situation, after applying the final torque, superstructure inaccuracy can be revealed in the form of occlusal interferences or changes in the tightness of proximal contacts. [ 12 13 ] In the present study, the frameworks were seated with controlled constant pressure, whereas in the oral cavity when the superstructure is commonly placed with finger or biting pressure on corresponding abutments, marginal gap may decrease due to increased seating force. Nevertheless, this may result in strain development within components or inadequate passive fit.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, this may result in strain development within components or inadequate passive fit. [ 12 13 ]…”

Section: Discussionmentioning

confidence: 99%

“…[ 5 6 7 ] Nevertheless, for implant systems with internal conical connections, a certain amount of axial abutment displacement occurs during tightening, so that as the level of tightening torque increases, the axial displacement of the abutment increases. [ 8 9 10 11 12 ] The axial displacement of the internal conical abutments is attributed to three factors: Wedge effect, settling effect, and machining tolerance. [ 10 ]…”

Section: Introductionmentioning

confidence: 99%

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Effect of tightening torque on the marginal adaptation of cement-retained implant-supported fixed dental prostheses

et al. 2015

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Background:The final position of the abutment changes with the amount of tightening torque. This could eventually lead to loss of passivity and marginal misfit of prostheses. The aim of this study was to evaluate the effect of three different tightening torques on the marginal adaptation of 3-unit cement-retained implant-supported fixed dental prostheses (FDPs).Materials and Methods:Two implants (Straumann) were inserted in an acrylic block so that one of the implants was placed vertically and the other at a 15° vertical angle. A straight abutment and a 15° angulated abutment were connected to the vertically and obliquely installed implants, respectively, so that the two abutments were parallel. Then, 10 cement-retained FDPs were waxed and cast. Abutments were tightened with 10, 20, and 35 Ncm torques, respectively. Following each tightening torque, FDPs were luted on respective abutments with temporary cement. The marginal adaptation of the retainers was evaluated using stereomicroscope. FDPs were then removed from the abutments and were sectioned at the connector sites. The retainers were luted again on their respective abutments. Luting procedures and marginal adaptation measurement were repeated. Data were analyzed by ANOVA and least significant difference tests (α = 0.05). After cutting the FDP connectors, the independent samples t-test was used to compare misfit values (α = 0.05).Results:Following 10, 20, and 35 Ncm tightening torques, the marginal discrepancy of the retainers of FDPs significantly increased (P < 0.05). There was no significant difference between the marginal discrepancies of these two retainers (P > 0.05). The marginal gap values of angulated abutment retainers (ANRs) were significantly higher than those of the straight abutment after cutting the connectors (P = 0.026).Conclusion:Within the limitations of this study, the marginal misfit of cement-retained FDPs increased continuously when the tightening torque increased. After cutting the connectors, the marginal misfit of the ANRs was higher than those of the straight abutment retainers.

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“…Analizowany jest w koronach na podbudowie metalowej licowanych ceramiką [1], koronach ceramicznych [18], koronach ceramicznych z tlenku cyrkonu stabilizowanego itrem [2]. Metody oceny dokładności odwzorowania koron i filarów polegają na fizycznych pomiarach odwzorowań wnętrza podbudowy z wykorzystaniem wycisku woskowego i pomiarach filara protetycznego [3,5], wykorzystują technikę skanowania modeli referencyjnych i replik [2,3,19,20], analizę dopasowania korony z wykorzystaniem mikro CT [10] lub CT [21] oraz analizę kształtu z wykorzystaniem światła strukturalnego [4,5]. Jednak żadna z tych metod nie wykorzystuje bezstronnego narzędzia -oceny dopasowania w automatycznej procedurze numerycznej wolnej od błędów związanych z osobą wykonującą pomiar.…”

Section: Omówienie I Dyskusjaunclassified

Ocena szczelności koron protetycznych w zależności od technologii ich wykonania

Ryniewicz

Ryniewicz²,

Bojko³

2015

ELECTROTECHNICAL REVIEW

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Ocena szczelności koron protetycznych w zależności od technologii ich wykonania Streszczenie. Celem opracowania była ocena in vitro szczelności koron ze stopu Co-Cr-Mo na zęby przedtrzonowe i trzonowe wykonanych w trzech technologiach: odlewania, frezowania i stapiania laserowego. Dla porównania dopasowania koron do filarów protetycznych stanowiących modele referencyjne wykorzystano skanowanie światłem strukturalnym i modelowanie w programie Geomagic Qualify 12. Badania pozwoliły stwierdzić, że szczelność koron protetycznych wykonanych w badanych technologiach jest porównywalna i spełnia wymogi kliniczne.

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Precision of fit between implant impression coping and implant replica pairs for three implant systems

Cited by 20 publications

References 17 publications

In vitro assessment of connection strength and stability of internal implant-abutment connections

In vitro assessment of connection strength and stability of internal implant-abutment connections

Effect of tightening torque on the marginal adaptation of cement-retained implant-supported fixed dental prostheses

Ocena szczelności koron protetycznych w zależności od technologii ich wykonania

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