A study of mandibular and maxillary root widths to determine dowel size

Tilk, Mary Ann; Lommel, Tennyson J.; Gerstein, Harold

doi:10.1016/s0099-2399(79)80153-3

Cited by 54 publications

(25 citation statements)

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“…Anyway this kind of technique, even though makes it easier to detect the depth of the post-space, is not able to record properly the root channel anatomy. Considering the better features of an anatomic endodontic post, such as the root dentin preservation (8,20,(29)(30)(31)(32)(33), reduced cement layer (34)(35)(36)(37), minor bubbles formation (38), increased post retention (7,8,39,40), and fracture resistance (41,42), in this study the possibility of producing an anatomic endodontic post through the use of an IOS has been investigated. To the best of our knowledge no studies have yet investigated the IOS capability to detect the post-space for the production of anatomic posts.…”

Section: Discussionmentioning

confidence: 99%

In Vitro Evaluation of the Post-Space Depth Reading With an Intraoral Scanner (Ios) Compared to a Traditional Silicon Impression

Pinto

Arcuri

Carosi

et al. 2017

ORL

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SUMMARYObjectives. The aim of the study was to assess the depth and quality of the post-space reading, using an IOS without scanpost, compared to a traditional silicon technique. Methods. Six extracted bicuspids were decoronated and endodontically treated. After having prepared the space for the posts, a structure in pink acrylic resin was created with two resin elements. At the center of the structure one sample was put at a time. Digital and traditional impressions were taken for each sample. Digital impressions were developed through the Computer-aided design (CAD) software in order to integrate the scanner results into a three-dimensional grid to make the measurements. A K-file was used to measure the length of the postspace of each sample obtained through the traditional silicon impression and subsequently the measurement results were reported on a millimeter gauge. Furthermore, an assessment of the width of the entrances of the post-spaces was carried out. Results. The mean reading depth discrepancy expressed in percentages (19.58%) indicates that the digital impression with current technologies fails to impress clearly the post-space. Standard deviation of the data expressed in percentage is 13.89, suggesting that the values were not similar to each other. In two cases the digital technique has achieved less than 10% difference compared to the traditional technique, but there have been also cases in which the variation in depth has reached almost 40%. The samples that showed the minor discrepancy between the two techniques expressed the widest post-space entrance. Conclusions. In this in vitro study, the application of the IOS for the post-space reading in order to deliver an anatomic post has been proven to be still not reliable, as there are still depth reading limitations for the narrow root channels. In fact, in this type of channels it is difficult to reach with the light beam of the IOS the deepest areas of the post-space, with a consequent incomplete post-space reading.

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Section: Discussionmentioning

confidence: 99%

In Vitro Evaluation of the Post-Space Depth Reading With an Intraoral Scanner (Ios) Compared to a Traditional Silicon Impression

Pinto

Arcuri

Carosi

et al. 2017

ORL

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“…At times, dentists must enlarge the diameter of a root canal for mechanical or pathological reasons, and in these cases, we suggest that the diameter be limited to less than 50% of the root diameter. For convenience in clinical treatment, we compare root diameters 4 mm from the apex as measured by Tilk [21] and list recommended post diameters along with ISO and Pesso reamer sizes (Table 4).…”

Section: Discussionmentioning

confidence: 99%

FEM analysis of the mandibular first premolar with different post diameters

Lin

Wang

et al. 2011

Odontology

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Several reports have pointed out that endodontically treated teeth can lack strength, and that the teeth can be reinforced using posts. However, it has not been clear how to select posts that meet the needs of most clinical situations, particularly in terms of the post diameter, which has a major influence on the occurrence of root fracture. The purpose of this study was to analyze the stress distributions of posts of various diameters during masticatory loads using a finite element method. A 3-dimensional (3D) finite element model of a lower first premolar was developed. We used the image software Geomagic Studio (3D Digital 2002; Geomagic, Research Triangle Park, NC, USA) to reduce the post diameter by 6 ratios to a root diameter of 20, 30, 40, 50, 60, and 80% and then individually implemented them into the root of a tooth. A chewing static force of 100 N was applied as a 45°diag-onal load on the buccal cusp tip, and the r von Mises and r max stresses were calculated. Analysis of the r von Mises values revealed that the stresses were concentrated in the middle 1/3 of both the post and the root surface for all models, as were the r max values. The results also indicated that when the diameter of the post was 50% of that of the root, the stress distributions of the post and the root surface were most favorable. In conclusion, the clinical implications of the results will need to be further studied and discussed.

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“…First, the most important advantage is the preservation of tooth structure. [42][43][44][45][46] A modified fiber post adapts to the root canal rather than adapting the root canal to the post, usually by enlarging it. This is a significant advantage as after endodontic treatment root canals are usually oval-shaped rather than perfectly round.…”

Section: Discussionmentioning

confidence: 99%