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Restoring Teeth That Are Endodontically Treated Through Existing Crowns

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Restoring Teeth That Are Endodontically Treated Through Existing Crowns Endodontics Restoring teeth that are endodontically treated through existing crowns. Part II: Survey of restorative materials commonly used GlennTrautmann,DMDVJamesL Gutmann, DDSVMarthaE Nunn DDS PhD=/ David E, Witherspoon, BDSc, MSVJay D, Shulman, DMD, MA, MSPH^ ' Objective: A survey was undertaken fc cafegorize fhe maferials used for Ihe restoration of endodonfic access openings through complete-coverage crowns after completion of nonsurgical raot canal treatment Method and materials: The survey package consisted of a cover letter stating instructions rationale and purpose for the quesfionnaire. a questionnaire of 8 short-answer questions, and a stamped self-' addressed envelope. A randomized sample of acfive denfisfs (300 general practifioners, 300 prosthodon- ftsts, and 300 endodonfists|, was selecfed. Collected dafa were analyzed with the chi-square analysis Results: Mosf general pracfitioners (937.), endodontists (61%), and prosthodontists (75%] reported that fhey frequentiy or always permanently restore teefh affer nonsurgical roof canal freafment. Empress was the all-ceramio sysfem used mosf commonly by prosthodontists (42%) and general practifioners (38%), A Sfafistically significanf difference in restorative maferiai preference was found (P < 0.0001 ), depending on the type of crown used. Conclusion: Amalgam alone and in combination with bonding agenfs are msferi- als of choice for restoration of access openings fhrough all-metal oomplefe crowns, while resin composite is the choice for all types ot complefe crowns involving porcelain. Endodonfisfs preferred "other maferials (Quintessence int2000.31:719-728) Key words: amalgam, bonding agent, complete-cove rage orown, glass-ionomer cement, nonsurgical root canal freafmenf, resin composite, survey he need for evidence-based treatment is surfacing CLINICAL RELEVANCE: Information gafhered from this Tthroughout the medical and dental cotnmunity as a survey will institufe guidelines for an in vitro sfudy fo iden- consequence of society's demand for responsible and tify whioh currently used maferials minimize leakage in predictable health care. The escalating avalanche of restored endodontic access openings through complete- new knowledge and increasing public expectation and coverage crowns. demand for successful outcomes from the set^'ices ren- dered by health science professionals have been identi- fied as 2 major factors pushing the need for evidence- based treatment,' However, over the past 25 years, the 'Graduate Residenf-Graduate Endodonfics, Ospartmert oí Restorafive Sciences, Bayloi College of Dentisfry, Texas ASM University Sysfem, explosion of new techniques, materials, and treatment Healffi Science Center, Oallas, Texas. philosophies in dentistry has created a trend to rely on ^Professor and Director ol Graduate Erdodontics, Department of anecdotal information and disregard the importance of Restorafive Sciences, Baylor College ol Dentistry, Te^as ASM University clinicai research. The anecdotal approach, however Sysfem, Health Science Center, Dallas, Texas. seductive and appealing, cannot stand up to an evi- ^Assistant Professor, Deparfment of Public Health Sciences, Baylor dence-based foundation when the responsibility of car- College of Dentistry, Texas ASful University System, Healffi Science ing for people is involved,^ It is necessary therefore, to Center, Dallas, Texas. adapt evidence-based support for the selection of 'Assistant Profess or-Gradua te Endodontios, Department of Resforative Sciences, Baylor College of Dentistry, Texas ASM University System, treatment choices that combine both the chnical and Healtti Science Center, Dallas, Texas, research directives that result in the delivery of quality ^Associate Professor, Deparfment of Publio Health Sciences, Baylor and predictable oral health care. College oí Dentistry, Texas ASM University System, Health Science Advances in current technology provide the practi- Center, Dallas, Texas. tioner with a variety of choices in materials for restoring Reprint iequesfs; Dr James L Gulmann. Baylor College of Dentistry, endodonticaily treated teeth. At times, these materials Graduate Endodonfics (Room 335], 3302 Gasten Avenue, Dallas, Texas 75246, E-mail: [email protected] are introduced to the practitioner through an aggressive Quintessence International 719 • Trautmann et al marketing strategy and may lack proper scientific test- issues. Issues included the practitioner's understanding ing to guarantee longevity and performance. Therefore, of coronal leakage and tbe preference of contemporary clinicians are exposed to a wide range of rnaterials for restorative materials to be used witb various types of which success is determined by trial and error. complete-coverage crowns. Tbe questions focused on One aspect of the materials' properties is the ability tbe clinical scenario of endodontically accessed teeth to obtain proper coronal seal, thereby protecting tbe witb preexisting complete-coverage crowns. pulp and internal anatomy of the tooth from bacterial In part I of this survey, different case situations exposure. However, to seal against all oral fluids is encountered in practice were addressed, including the impossible, and, to date, none of tbe presently available longevity and failure of crowns, the pulpal condition, restorative materials provides a complete seal.'*' The and the pracfitioncrs' views on the relevance of leak- integrity of these materials must therefore be investi- age to the ultimate success of the crown. In part II of gated to provide a scientific basis for their clinical use. the survey, the respondents' attitudes toward perma- Endodontists estimate that 20% to 50% of root nent restoration of' endodontically treated teeth and canal treatment is performed through complete-cover- specific restorative techniques for sealing the access age crowns.= Once the coronal aspect of the root canal cavity of teeth treated through complete-coverage system is exposed to the oral environment through crowns are addressed. leaking crown tnargins or recurrent caries, the ingress The attitudes and pracfices of general practitioners, of bacteria to the periapicai tissues may be unavoid- prosthodontists, and endodonfists as ascertained from able. Likewise, coronal leakage has been identified as this survey were compared with chi-squared tests of a major factor in the bacterial contamination of previ- independence. All stafistical analyses were performed ously treated root canals and tbe subsequent failure of with SPSS statisfical software (version 9.0, SPSS). tbis treatment.^"" Given that coronal leakage is a sig- nificant cause of the failure of nonsurgical root canal treatment (NSRCT), tbe long-term success of root RESULTS canal therapy that is performed through existing artifi- cial crowns is highly dependent on the seal of the Nine hundred surveys were initially mailed within a access opening made through the crown. time span of 90 days. Of the 900 surveys sent out, 543 For teeth with complete-coverage crowns, marginal were completed and returned, representing a 60% leakage and intermaterial leakage must be considered response. As described previously, tbe survey was when the materials used to seal tbe NSRCT access designed to address 2 distinct issues. The results of opening from the ingress of oral microorganisms are questions that addressed the issues of the longevity evaluated. The restorative materiai placed in the access and failure of crowns, the pulpal condition on entry cavity of these teeth should allow minimal or no leak- througb a complete-coverage crown, the respondents' age. Tbe cboice of restorative material placed in tbe atfitude toward restoration of recently endodontically access opening of crowned teeth that receive NSRCT is treated teeth, and their views on the relevance of leak- based routinely on empiricism and personal prefer- age to the success or failure of the endodontic therapy ence.'^ Presently, tbere are no studies tbat provide evi- are described in part I of tbis series.'^ dence-based research as to tbe best material for the res- This section of the survey targeted tbe issue of torafion of the access opening through artificial crowns. restoring the endudontically treated, complete-cover- The purpose of this study was to categorize, age fixed crown on completion of endodontic therapy through the data obtained in a survey, the materials and provisional restoration of the tootb during the used by practitioners for tbe restoration of endodontic course of tbe endodontic procedure. Practitioners access openings through complete-coverage crowns. were asked whetber they restored access openings The data in the first part of the survey identified issues through complete-coverage crowns, the type of ail- concerning the long-term success of complete-cover- ceramic system used (if any), and what types of materi- age restorations, their need for nonsurgical root canal als they used to restore access openings through vari- treatment, and its association with leakage when ous types of complete-coverage crowns. The applicable encountered in contemporary clinical practice.'^ questions from the survey are shown in Fig 1. The overall response to the first question was 99% (535/543). Table 1 details the responses of each prac- METHOD AND MATERIALS titioner group along with the respective response rates for restoring access openings of endodontically The design of the questionnaire for this study was treated, crowned teeth, AH practitioner groups had detailed in part I of this series."
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