Pilotstudie zur Genauigkeit und Dimensionsstabilität von Abformmaterialien mittels industrieller CT-Messungen

Steinhäuser-Andresen, Stefanie; Detterbeck, Andreas; Funk, Christoph; Krumm, Michael; Kasperl, Stefan; Holst, Alexandra Ioana; Hirschfelder, Ursula

doi:10.1007/s00056-011-0015-6

Cited by 29 publications

(29 citation statements)

References 21 publications

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“…The precision of reversible hydrocolloid impressions after extractions is considered sufficient. The margin of error, which has been given as ± 130 μm [43], is higher than the precision of the CBCT [42] .…”

Section: Preliminary Results Of the Feasibility Testmentioning

confidence: 91%

Alveolar Ridge Preservation as a Way to Reduce the Need for Bone Augmentation: Implementation of a New, Non-invasive Method of Measuring Bone Preservation: Study Protocol of a Randomized Controlled Clinical Trial and Feasibility Testing Results

Schnutenhaus¹,

Dreyhaupt²,

Doering³

et al. 2017

Int J Clin Res Trials

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Introduction: The efficacy of alveolar ridge preservation (ARP) in preserving the bone after tooth extractions and before rehabilitation with an implant-supported restoration is examined. A new, non-invasive measurement method to determine the extent of bone preservation is presented. This measurement method is based on a 3D comparison of the condition immediately after extraction with the data of a cone-beam computed tomography (CBCT) eight weeks after extraction. Method:The study is a single-center, randomized, controlled parallel-group clinical investigation. 88 patients who required extraction of a maxillary tooth participated in the study. In 44 patients (intervention group), the socket is filled with a combination of a collagen plug and a collagen membrane introduced in the empty socket immediately after tooth removal (ARP). The 44 patients (control group) experience unassisted socket healing the hyporeflective space. Primary endpoints are (1) bone loss after tooth extraction; (2) the preservation of the alveolar ridge (soft tissue and bone); (3) the need for augmentation during the subsequent implant treatment; and (4) the question whether ARP is more costeffective than the therapy with unassisted socket healing. Patients will be followed for 5 years. Discussion:The extent of bone resorption after tooth extraction significantly influences the subsequent implant placement. Preserving the bone as well as possible is of great importance for the stability, prosthetically correct position and long-term functional success of the implantological treatment. A new, non-invasive method, without additional, study-related X-ray exposure, presented here for the first time, the change in volume of the bone bed can be analyzed. The preliminary results of this feasibility test report a median value of buccal and palatal bone loss of 6.2 mm (control)/4.4 mm (test) and 2.5 mm (control)/2.8 mm (test), respectively. These values are comparable to studies that also determined bone resorption by CBCT.

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Section: Preliminary Results Of the Feasibility Testmentioning

confidence: 91%

Alveolar Ridge Preservation as a Way to Reduce the Need for Bone Augmentation: Implementation of a New, Non-invasive Method of Measuring Bone Preservation: Study Protocol of a Randomized Controlled Clinical Trial and Feasibility Testing Results

Schnutenhaus¹,

Dreyhaupt²,

Doering³

et al. 2017

Int J Clin Res Trials

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“…[16,23,24]) would be eligible in principle but are prohibitively expensive for routine use in clinical practice. Laser scanners, on the other hand, would offer adequate precision for clinical use [8] while not being a viable alternative in practice due to slow data acquisition and a need for high-precision mechanical guidance.…”

Section: Discussionmentioning

confidence: 99%

“…Zwar existieren weitere aktive berüh-rungslose Verfahren, die zum Einscannen von Abformungen verwendet werden können -wie beispielsweise die Computertomographie, die zur Digitalisierung von Abformungen verwendet wurde [16,23,24]. Die hohen Kosten sind für die Rou-…”

Section: Discussionunclassified

Optical 3D scans for orthodontic diagnostics performed on full-arch impressions

et al. 2015

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In strictly quantitative terms, the impression scans did capture relatively large percentages of the total surface. However, the topographic examinations revealed that regions essential for orthodontic model analysis were missing. The malocclusion models were particularly affected. Thus, impression scans performed with structured-light scanners cannot replace scans of positive casts for diagnostic use in orthodontics.

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“…A variety of potential measurement techniques which could have been used for the purpose of this study have been described in the literature including coordinate measurement machines [9], 3D image correlation procedures [22,25], and CT scanning [26]. As repeatedly described, a strain gauge equipped restoration fitting a reference model may also be used for assessing the accuracy of master casts [9,12,14,27,28].…”

Section: Discussionmentioning

confidence: 99%

Variables Affecting the Accuracy of Implant Master Casts: An In Vitro Pilot Study

Karl

Palarie

2014

Journal of Dental Surgery

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Impression and master cast accuracy have been identified as being the major determinants of superstructure fit in implantsupported restorations. The goal of this in vitro investigation was to determine the effects of different transfer components, impression materials, disinfection, storage time, and stone type on master cast accuracy. Following impression making from a reference model with two internal-hex bone-level implants and master cast fabrication (eight experimental groups; n = 5), a bar-type measurement device equipped with a strain gauge was fixed on all master casts while strain development was recorded. Statistical analysis was performed applying ANOVA and paired t-tests with the level of significance set at = 0.05. The transfer components with plastic sleeves caused maximum misfit strain which was significantly greater as compared to click (P = 0.02) and open tray transfer components (P = 0.00). No significant effect on master cast accuracy was recorded for the parameters impression material, impression disinfection, and storage of impressions or casts. Lower strain development was observed in casts poured in type 3 stone as compared to casts poured in type 4 stone (P = 0.01). For the bone-level implant system considered here, the great levels of accuracy could be achieved using pick-up impressions with either click or open tray impression components.

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Pilotstudie zur Genauigkeit und Dimensionsstabilität von Abformmaterialien mittels industrieller CT-Messungen

Cited by 29 publications

References 21 publications

Alveolar Ridge Preservation as a Way to Reduce the Need for Bone Augmentation: Implementation of a New, Non-invasive Method of Measuring Bone Preservation: Study Protocol of a Randomized Controlled Clinical Trial and Feasibility Testing Results

Alveolar Ridge Preservation as a Way to Reduce the Need for Bone Augmentation: Implementation of a New, Non-invasive Method of Measuring Bone Preservation: Study Protocol of a Randomized Controlled Clinical Trial and Feasibility Testing Results

Optical 3D scans for orthodontic diagnostics performed on full-arch impressions

Variables Affecting the Accuracy of Implant Master Casts: An In Vitro Pilot Study

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