Guest guest Posted January 17, 2012 Report Share Posted January 17, 2012 I think length and surface texture and post design ( taper/parallel) all are imp for retention of a post....LENGTHStudies have reported that the length of the post hasa significant effect on its retention and in mostinstances, the more deeply the post is placed, the moreretentive it becomes.40Leary et al.41also found thatposts with a length of at least 3-quarters of the lengthof the root offered the greatest rigidity and least rootdeflection (bending) when compared with posts thatwere a half or a quarter the root length (Fig. 1). Shortposts are especially dangerous and have a much higherfailure rate..DESIGN and SURFACESome studiesreported that the parallel-sidedposts provided superior retention when compared withtapered posts; however, others41,51,52have indicatedthat threaded posts are the most retentive, followed byparallel posts, with tapered posts the least retentive.Another study reported that serrations on the post surface increased retention when compared with a smoothsurface.49Tapered posts produced the greatest stress at thecoronal shoulder, and parallel posts generated theirgreatest stress at the apex of the canal preparation.53Parallel posts resisted tensile, shear, and torquingforces better than tapered posts and distributed stressmore uniformly along their length during function.51Several studies have reported that a well-adapted, passively luted, parallel-sided post provided the mostretentive post with the least stresshere is the link to the articlehttp://www.endoexperience.com/documents/Factorsaffectingretentionofpostsystems.pdf From: shirine <shirineshahul@...> Sent: Tuesday, 17 January 2012 3:27 AM Subject: restorative n endo q can anyone please answer 1.what is restorative complexity index? 2.characteristic for best retention of post a.length b.taper c.superficial texture thank u shirine. Quote Link to comment Share on other sites More sharing options...
Guest guest Posted January 17, 2012 Report Share Posted January 17, 2012 thank u.......... From: Divi Divi <divi_ore@...> " " < > Sent: Tuesday, 17 January 2012 4:12 PM Subject: Re: restorative n endo q  I think length and surface texture and post design ( taper/parallel)  all are imp for retention of a post....LENGTHStudies have reported that the length of the post hasa significant effect on its retention and in mostinstances, the more deeply the post is placed, the moreretentive it becomes.40Leary et al.41also found thatposts with a length of at least 3-quarters of the lengthof the root offered the greatest rigidity and least rootdeflection (bending) when compared with posts thatwere a half or a quarter the root length (Fig. 1). Shortposts are especially dangerous and have a much higherfailure rate..DESIGN and SURFACESome studiesreported that the parallel-sidedposts provided superior retention when compared withtapered posts; however, others41,51,52have indicatedthat threaded posts are the most retentive, followed byparallel posts, with tapered posts the least retentive.Another study reported that serrations on the post surface increased retention when compared with a smoothsurface.49Tapered posts produced the greatest stress at thecoronal shoulder, and parallel posts generated theirgreatest stress at the apex of the canal preparation.53Parallel posts resisted tensile, shear, and torquingforces better than tapered posts and distributed stressmore uniformly along their length during function.51Several studies have reported that a well-adapted, passively luted, parallel-sided post provided the mostretentive post with the least stresshere is the link to the articlehttp://www.endoexperience.com/documents/Factorsaffectingretentionofpostsystems.pdf From: shirine <shirineshahul@...> Sent: Tuesday, 17 January 2012 3:27 AM Subject: restorative n endo q  can anyone please answer 1.what is restorative complexity index? 2.characteristic for best retention of post a.length b.taper c.superficial texture thank u shirine. Quote Link to comment Share on other sites More sharing options...
Guest guest Posted January 17, 2012 Report Share Posted January 17, 2012 Please look into the following atachment it is given in detail..http://www.rcseng.ac.uk/fds/publications-clinical-guidelines/clinical_guidelines/documents/complexityassessment.pdf On Tue, Jan 17, 2012 at 3:27 AM, shirine <shirineshahul@...> wrote: can anyone please answer 1.what is restorative complexity index? 2.characteristic for best retention of post a.length b.taper c.superficial texture thank u shirine. Quote Link to comment Share on other sites More sharing options...
Guest guest Posted January 17, 2012 Report Share Posted January 17, 2012 thank u very much. From: manochitra d <manochithradurairaju@...> Sent: Wednesday, 18 January 2012 2:22 AM Subject: Re: restorative n endo q  Please look into the following atachment it is given in detail..http://www.rcseng.ac.uk/fds/publications-clinical-guidelines/clinical_guidelines/documents/complexityassessment.pdf On Tue, Jan 17, 2012 at 3:27 AM, shirine <shirineshahul@...> wrote:  can anyone please answer 1.what is restorative complexity index? 2.characteristic for best retention of post a.length b.taper c.superficial texture thank u shirine. Quote Link to comment Share on other sites More sharing options...
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