Effect of crown margins on periodontal conditions in regularly attending patients

Bader, James D.; Rozier, R. Gary; McFall, Walter T.; Ramsey, Diane L.

doi:10.1016/0022-3913(91)90053-y

Cited by 106 publications

(78 citation statements)

References 19 publications

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“…However, there is evidence demonstrating the risk of harm that Sub-G prosthetic margins have on the periodontal apparatus compared to prosthetic margins at or above the gingival crevice. 5,[7][8][9][10] …”

Section: Restorative Dentistrymentioning

confidence: 99%

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Limited evidence on the best position for prosthetic margins

Balevi

2013

Evid Based Dent

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Abstracted fromPapageorgiou SN, Papadelli AP, Koidis PT, Petridis HP. Data extraction and synthesis Study selection and quality assessment was carried out by two reviewers. Trials were compared by grouping abutments teeth/abutment surfaces with subgingival margins. Caries incidence was evaluated as a dichotomous variable. The risk ratio (RR) for caries incidence of prosthetic margins was calculated for the direct comparisons and pooled using a random-effects model. The overall quality of evidence supporting the association between secondary caries and margin placement was assessed using the GRADE system.

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Section: Restorative Dentistrymentioning

confidence: 99%

“…This is significant because the progression of gingival recession around prosthetic margins is a common occurrence. 5 Furthermore, significant variation existed in how marginal caries were measured and assessed between included studies. Sub-G crown margins are more difficult to identify visually or tactilely with an explorer.…”

mentioning

confidence: 99%

Limited evidence on the best position for prosthetic margins

Balevi

2013

Evid Based Dent

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“…Given that marginal integrity is a significant criterion in long-term clinical success, a greater cement film (Almeida et al, 2013) results in several complications; including mechanical defects, discoloration and decay (Aboushelib et al, 2012), luting agent dissolution (Colpani et al, 2013 andBaig et al, 2010); microleakage and plaque accumulation (Contrepois et al, 2013, Beuer et al, 2010, and Bergenholtz et al, 1982; increased recurrent caries incidence (Felden et al, 2000); and pulpal inflammation (Bader et al, 1991). While some literature suggests a higher accuracy of marginal fit in metalceramic over all-ceramic restorations, others suggest negligible differences between these restoration types (Pneumans et al 2000).…”

Section: Marginal Integritymentioning

confidence: 99%

“…Established dental literature supports clinically acceptable marginal integrity from 40 to 120 μm (McLean et al, 1971, Bader et al, 1991, Sulaiman et al, 1997, with 120 μm considered the "maximum, tolerable marginal opening" for tooth preparations (Contrepois et al, 2013). Unacceptable or inadequate marginal fits (typically wider than 120 μm) can shorten the longevity of a restoration due to greater cement film exposure (Yucel et al, 2013).…”

Section: Marginal Integritymentioning

confidence: 99%

Evaluating the marginal integrity of lithium disilicate veneers fabricated by digital impressions and CAD/CAM compared to conventional techniques.

Guzelian¹

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DEDICATIONThis dissertation is dedicated to my parents, Charles and Karen Guzelian, and my sister, Krista Guzelian, whose sacrifices for my education, personal development, and wellbeing have positively shaped my growth as a critical thinker and successful young adult.Their unconditional love and constant support for these endeavors cannot be expressed fully in words.iv ACKNOLWEDGEMNTS I would like to thank my thesis advisor, Dr. Amirali Zandinejad, for his patience, guidance, trust, and encouragement throughout the entire research process. Dr. Zandinejad offers a wealth of knowledge on prosthodontics, clinical dental training, and evidencebased dentistry, and he maintained very high standards in this thesis to produce an exceptional final product. Dr. Zandinejad provided confidence in my abilities that I will succeed in dental school and beyond.In addition, I would like to thank my thesis committee members: Dr. Tamer AbdelAzim, for his step-wise clarity during the impressions process and expertise on CAD/CAM applications in dentistry; Dr. Michael Metz, for his high expectations in my degree to yield significant and publishable results; and Dr. Don Demuth, for his willingness to listen and participate in a field outside his own expertise as another prominent, national voice within oral biology.I would like to thank Dr. Dean Morton for approving a non-specialty graduate student to complete a thesis-based degree within his department, a consideration which included specialty equipment, clinical materials, financial support, and faculty involvement to complete the study.I would like to thank Dr. Claudio Maldonado for allowing me access to his laboratory for imaging, which included a stereomicroscope and capturing software. This in vitro study compared marginal gap size in anterior lithium disilicate veneers produced by conventional and digital impressions. One typodont right central incisor was prepared for an all-ceramic cast. Ten conventional veneers were fabricated using Type IV stone, PVS, and IPS e.max press, while ten digital veneers were fabricated using Lava COS (3M ESPE) and IPS e.max CAD/CAM processing and milling. Samples were divided double-blindly, captured at 45X magnification, evaluated at three images per orientation (B-D-M-P), and measured at three distances (largest, smallest, best fit) per image. Data points were entered into SPSS code for one-way and two-way ANOVA, t-testing, Chi square, and odds ratio. Compared to conventional technique, digital veneers recorded greater mean gap distances at all orientations, fewer "good fit" locations, and average gap size ≥ 120 µm. All analysis techniques were statistically significant. In vivo follow-up is necessary to justify digital impressions in clinical settings.vii

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“…32 Poor marginal adaptation in fixed prosthesis leads to increased plaque retention and subsequent changes in the subgingival microflora leading to periodontal disease [33][34][35][36] and secondary caries. 37 Additionally, a large marginal gap leads to increased exposure of the luting agent to the oral environment which may cause increased microleakage and cement dissolution.…”

Section: Marginal Gapmentioning

confidence: 99%

Comparison of marginal fit of lithium disilicate crowns fabricated with CAD-CAM technology using conventional impressions and two intra-oral digital scanners.

Rogers¹

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Effect of crown margins on periodontal conditions in regularly attending patients

Cited by 106 publications

References 19 publications

Limited evidence on the best position for prosthetic margins

Limited evidence on the best position for prosthetic margins

Evaluating the marginal integrity of lithium disilicate veneers fabricated by digital impressions and CAD/CAM compared to conventional techniques.

Comparison of marginal fit of lithium disilicate crowns fabricated with CAD-CAM technology using conventional impressions and two intra-oral digital scanners.

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