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yxfbbiedtj · Wysłany: Wto 4:32, 22 Mar 2011

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~ 3 pile retention . Into the part of the location can be flexible according to the specific circumstances of teeth design. In 1 case as an example : The patient , female , 37 years old,[link widoczny dla zalogowanych], left maxillary first molar was root, root surface after tooth preparation in subgingival 2 ~ 3ITIITI. Palatal root thick,[link widoczny dla zalogowanych], cheeks root parallel, three tubes have reached the preliminary requirements. There are two designs : ① palatal root placed into the part of the cheeks with cast cast post and core root . ② cheeks were placed into the root part of the palatal root cast cast post and core . Considered as a function of the maxillary first molar sharp tongue ,[link widoczny dla zalogowanych], then choose the second design. If only two root canal teeth can be used to have to choose a relatively long cast post and core cast root canal . If the time for the design of residual crown in May 2008 Volume 5, l5 less of preparation should also be considered healthy tooth , the root uneven line in place to take care of different road . And the ease of clinical operation . 3.3 Most studies show that the diameter of the pile diameter,[link widoczny dla zalogowanych], root diameter of 1 / 3 of the most appropriate [ 41. Min Back experimental results show that increasing the diameter of the pile of retention had little effect . So . Are currently not in favor of the diameter to increase by increasing retention . 3.4 The form of the previous results show that the adhesive power of parallel piles large imprison than conical pile . In addition, the choice is between indications restoration key to the success of this experiment, repeated after 1 year , 1 case of mandibular first molar root bifurcation by splitting removal , repair of the case before the X ray shows a root bifurcation Widened periodontal ligament . Molar residual crown and root reserves , not only to avoid the absorption of alveolar bone after tooth extraction , the elongation of the jaw teeth , adjacent teeth tilt problem, but also avoid free missing. However, production of tedious post-core molars , and ParaPost casting molar root canal system was applied to multiple nuclear pile , taking into account the stability of a cast post and core into a root canal system of pre- convenient. But it must be strictly selected indications. And follow the rules,[link widoczny dla zalogowanych], to receive a good restoration results. I