Study Results
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View full resultsBasic Information
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COMPLETED
NA
12 participants
INTERVENTIONAL
2015-12-31
2016-03-31
Brief Summary
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Detailed Description
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The Institutional Board(IRB) of the Stomatological Hospital of Fourth Military Medical University(FMMU) would be in supervision of the whole study and is responsible for the quality assurance plan, data check and source data verification.
Subject recruitment would done within those patients visit the department of prosthodontics of the Stomatological Hospital of FMMU and have an interest towards this study. One clinician would be appointed to enroll the subjects according to the standards. To avoid errors, all the examinations done in the study shall be accomplished by the same clinician and the crowns fabricated in the study shall be designed by the same technician. The clinician and the technician participated would receive adequate training before the study to ensure their performance. Every subject in the study should assign informed consents at the beginning of the study and establish case report forms(CRFs). During the study, if adverse events(such as crown chipping, crown dropping or iatrogenic gingivitis, etc) happen, subjects are required to contact the investigator within 24 hours; and the investigator should then report to the IRB within 24 hours. Following treatment or compensation would be done according to the clauses stated in the informed consent signed by the subjects.
The whole study needs subjects in total. During the study, subjects have their own right to quit the study at any time if they have discussed with the investigator in advance. These subjects then are deemed as "unavailable". If subjects don't contact the investigator and quit the study(the investigators can't contact them within the follow-up period), their records then are deemed as "missing".
All the information collected in the study would be protected and only be used within this study. The statistical analysis of this study would be processed with the aid of the department of statistics of FMMU.
Conditions
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Study Design
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RANDOMIZED
CROSSOVER
TREATMENT
SINGLE
Study Groups
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FGP design (FGP, AVR)
use functional generated path to execute different occlusal surface designs of the artificial crown and evaluate its efficacy
FGP
To execute FGP technique, the occlusal surface of the interim should be back cut to leave at least 1mm occlusal space. Then apply the recording resin. Ask the subjects to close the mouth to maximum intercuspal position then perform right lateral, left lateral and protrusive movements in succession ending in maximum intercuspation position. Excessive resin then should be trimmed off and Bausch articulating paper would be used to mark the intercuspal contacts. Zinc oxide is then applied to check eccentric occlusion, trimmed off resin if there're interferences. Then the interim would be used as a copy to design the occlusal surface of the crown. (CAD/CAM)
AVR
the crowns in this group would be designed by setting virtual articulator to average mode (CAD/CAM)
conventional design (CON)
use conventional method to execute different occlusal surface designs of the artificial crown and evaluate its efficacy
No interventions assigned to this group
Interventions
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FGP
To execute FGP technique, the occlusal surface of the interim should be back cut to leave at least 1mm occlusal space. Then apply the recording resin. Ask the subjects to close the mouth to maximum intercuspal position then perform right lateral, left lateral and protrusive movements in succession ending in maximum intercuspation position. Excessive resin then should be trimmed off and Bausch articulating paper would be used to mark the intercuspal contacts. Zinc oxide is then applied to check eccentric occlusion, trimmed off resin if there're interferences. Then the interim would be used as a copy to design the occlusal surface of the crown. (CAD/CAM)
AVR
the crowns in this group would be designed by setting virtual articulator to average mode (CAD/CAM)
Other Intervention Names
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Eligibility Criteria
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Inclusion Criteria
* the antagonist of the abutment tooth is purely natural or received minimum restorations that does not change its morphology too much
* no orthodontic treatment history
* stable occlusion
* no parafunctional movements existed
Exclusion Criteria
* the morphology of the antagonist of the abutment tooth has been largely changed by previous treatment
* no contact exists between the abutment tooth and its antagonist
* orthodontic treatment history
* unstable occlusion
* existed parafunctional movements
* participated in other clinical studies
18 Years
65 Years
ALL
Yes
Sponsors
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Air Force Military Medical University, China
OTHER
Responsible Party
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Ji-hua Chen
Dean, Professor
Principal Investigators
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Jihua Chen, PhD
Role: STUDY_CHAIR
Stomatological Hospital of FMMU
Locations
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Stomatological Hospital of Fourth Military Medical University
Xi’an, Shanxi, China
Countries
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References
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Mehl A. A new concept for the integration of dynamic occlusion in the digital construction process. Int J Comput Dent. 2012;15(2):109-23. English, German.
Ikeda A, Miura H, Okada D, Tokuda A, Shinogaya T. The effect of occlusal contacts on adjacent tooth. J Med Dent Sci. 2005 Dec;52(4):195-202.
Alhouri N, Watts DC, McCord JF, Smith PW. Mathematical analysis of tooth and restoration contour using image analysis. Dent Mater. 2004 Nov;20(9):893-9. doi: 10.1016/j.dental.2004.06.003.
Vasconcelos FS, Neves AC, Silva-Concilio LR, Cunha LG, Rode Sde M. Influence of anatomic reference on the buccal contour of prosthetic crowns. Braz Oral Res. 2009 Jul-Sep;23(3):230-5. doi: 10.1590/s1806-83242009000300002.
Kohal RJ, Gerds T, Strub JR. Effect of different crown contours on periodontal health in dogs. Clinical results. J Dent. 2003 Aug;31(6):407-13. doi: 10.1016/s0300-5712(03)00070-8.
Takada J, Ono T, Miyamoto JJ, Yokota T, Moriyama K. Association between intraoral pressure and molar position and inclination in subjects with facial asymmetry. Eur J Orthod. 2011 Jun;33(3):243-9. doi: 10.1093/ejo/cjq060. Epub 2010 Sep 9.
Olthoff L, Meijer I, de Ruiter W, Bosman F, van der Zel J. Effect of virtual articulator settings on occlusal morphology of CAD/CAM restorations. Int J Comput Dent. 2007 Apr;10(2):171-85. English, German.
Memon S. A Comparative Evaluation of the Effect of Double Casting Technique Using Functionally Generated Path and Conventional Single Casting with Respect to Functional Articulation, Patient Satisfaction and Chair Side Time, in Single Unit Molar Teeth: An In Vivo Study. J Indian Prosthodont Soc. 2014 Dec;14(Suppl 1):119-25. doi: 10.1007/s13191-014-0379-6. Epub 2014 Jul 10.
Curtis SR. Functionally generated paths for ceramometal restorations. J Prosthet Dent. 1999 Jan;81(1):33-6. doi: 10.1016/s0022-3913(99)70232-5.
Wiklund L, Rossi F, Strata P, van der Want JJ. The rat olivocerebellar system visualized in detail with anterograde PHA-L tracing technique, and sprouting of climbing fibers demonstrated after subtotal olivary lesions. Eur J Morphol. 1990;28(2-4):256-67.
Ender A, Mormann WH, Mehl A. Efficiency of a mathematical model in generating CAD/CAM-partial crowns with natural tooth morphology. Clin Oral Investig. 2011 Apr;15(2):283-9. doi: 10.1007/s00784-010-0384-z. Epub 2010 Feb 9.
Becker CM, Kaldahl WB. Current theories of crown contour, margin placement, and pontic design. 1981. J Prosthet Dent. 2005 Feb;93(2):107-15. doi: 10.1016/j.prosdent.2004.11.005. No abstract available.
Hazen SP, Osborne JW. Relationship of operative dentistry to periodontal health. Dent Clin North Am. 1967 Mar:245-54. No abstract available.
Yuodelis RA, Weaver JD, Sapkos S. Facial and lingual contours of artificial complete crown restorations and their effects on the periodontium. J Prosthet Dent. 1973 Jan;29(1):61-6. doi: 10.1016/0022-3913(73)90140-6. No abstract available.
Koidis PT, Burch JG, Melfi RC. Clinical crown contours: contemporary view. J Am Dent Assoc. 1987 Jun;114(6):792-5. doi: 10.14219/jada.archive.1987.0189.
Parkinson CF. Excessive crown contours facilitate endemic plaque niches. J Prosthet Dent. 1976 Apr;35(4):424-9. doi: 10.1016/0022-3913(76)90010-x.
Cho SH, Chang WG. Mirror-image anterior crown fabrication with computer-aided design and rapid prototyping technology: a clinical report. J Prosthet Dent. 2013 Feb;109(2):75-8. doi: 10.1016/S0022-3913(13)60018-9.
Other Identifiers
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IRB-REV-2015039
Identifier Type: -
Identifier Source: org_study_id
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