Abstract
Statement of problem
Although computer-aided design has become popular, restorations are typically designed
from static occlusion and dynamically by using an average-value virtual articulator.
Patient-specific motion recorded by using an intraoral scanner has rarely been used
to design restorations, and its design ability has not been analyzed.
Purpose
The purpose of this clinical study was to record patient-specific motion by using
an intraoral scanner and to analyze its ability to design the morphology of the wear
facets on mandibular first molar crowns.
Material and methods
An intraoral scanner was used to scan complete arch digital casts and to record patient-specific
motion of 11 participants. Right and left mandibular first molars were selected as
the target teeth. The complete crown preparations of the target teeth were virtually
prepared on the digital mandibular casts by using the Geomagic Studio 2013 software
program. High points were created by elevating the wear facets of the target teeth
by 0.3 mm in the occlusal direction to generate digital wax patterns. The Dental System
software program was used to design crowns with the anatomic coping design method.
Occlusal adjustment with static occlusion (STA crown), with the average-value virtual
articulator (DYN crown), and with patient-specific motion (FUN crown) was carried
out. The crowns adjusted with these 3 methods were compared with the original wear
facets. The mean value and root mean square (RMS) of 3D deviation were measured. One-way
ANOVA was used to analyze the influence of the occlusal surface design methods on
the morphology of the wear facets (α=.05).
Results
The STA crowns had the poorest results with the mean ±standard deviation 3D deviation
value of 0.15 ±0.05 mm and RMS value of 0.19 ±0.04 mm. The best results occurred in
the FUN group, with the mean ±standard deviation 3D deviation value of 0.05 ±0.06
mm and RMS value of 0.13 ±0.03 mm. Significant differences were found among the 3
groups (P<.01). Except for the RMS value between the STA and DYN groups, significant differences
were found between groups from the pairwise comparisons.
Conclusions
The occlusal surface of the crowns designed by using the patient-specific motion recorded
with the intraoral scanner had the best coincidence with the morphology of the wear
facets on the original teeth.
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References
- Occlusion and disocclusion time changes in single unit crowns designed by functional generated path technique: a randomised clinical trial.Sci Rep. 2017; 7: 388
- Computer-aided determination of occlusal contact points for dental 3-D CAD.Med Biol Eng Comput. 2006; 44: 445-450
- Computer modeling of occlusal surfaces of posterior teeth with the CICERO CAD/CAM system.J Prosthet Dent. 2000; 84: 154-162
- Comparative study of all-ceramic crowns obtained from conventional and digital impressions: clinical findings.Clin Oral Investig. 2019; 23: 1745-1751
- Will digital impressions eliminate the current problems with conventional impressions?.J Am Dent Assoc. 2008; 139: 761-763
- Clinical performance of CEREC AC Bluecam conservative ceramic restorations after five years--a retrospective study.J Dent. 2015; 43: 1076-1082
- A clinical comparison of digital and conventional impression techniques regarding finish line locations and impression time.J Esthet Restor Dent. 2020; 32: 236-243
- Evaluation of operating time and patient perception using conventional impression taking and intraoral scanning for crown manufacture: a split-mouth, randomized clinical study.Int J Prosthodont. 2018; 31: 55-59
- Intraoral digital impression technique compared to conventional impression technique. A randomized clinical trial.J Prosthodont. 2016; 25: 282-287
- Marginal fit of zirconia copings fabricated after conventional impression making and digital scanning: an in vitro study.J Prosthet Dent. 2020; 124: 221-223
- Randomized clinical trial of a conventional and a digital workflow for the fabrication of interim crowns: an evaluation of treatment efficiency, fit, and the effect of clinician experience.J Prosthet Dent. 2021; 125: 73-81
- Comparative assessment of complete-coverage, fixed tooth-supported prostheses fabricated from digital scans or conventional impressions: a systematic review and meta-analysis.J Prosthet Dent. 31 October 2020; ([Epub ahead of print])https://doi.org/10.1016/j.prosdent.2020.09.017
- Marginal adaptation of zirconia complete-coverage fixed dental restorations made from digital scans or conventional impressions: a systematic review and meta-analysis.J Prosthet Dent. 2021; 125: 603-610
- Evaluation for the fully automatic inlay reconstruction by means of the biogeneric tooth model.Int J Comput Dent. 2006; 9: 101-111
- Comparison of ozone gas and sodium hypochlorite/chlorhexidine two-visit disinfection protocols in treating apical periodontitis: a randomized controlled clinical trial.Clin Oral Investig. 2017; 21: 995-1005
- CAD-CAM in dentistry.J Am Dent Assoc. 1988; 117: 715-720
- Accuracy of occlusal contacts for crowns with chairside CAD/CAM techniques.Int J Comput Dent. 2010; 13: 303-316
- Biogeneric tooth: a new mathematical representation for tooth morphology in lower first molars.Eur J Oral Sci. 2005; 113: 333-340
- A new mathematical process for the calculation of average forms of teeth.J Prosthet Dent. 2005; 94: 561-566
- Glossary of digital dental terms.J Prosthodont. 2016; 25: S2-S9
- Mirror-image anterior crown fabrication with computer-aided design and rapid prototyping technology: a clinical report.J Prosthet Dent. 2013; 109: 75-78
- The fabrication of a CAD/CAM ceramic crown to fit an existing partial removable dental prosthesis: a clinical report.J Prosthet Dent. 2012; 108: 143-146
- Cerec Smile Design--a software tool for the enhancement of restorations in the esthetic zone.Int J Comput Dent. 2013; 16: 255-269
- Virtually designed and CAD/CAM-fabricated lithium disilicate prostheses for an esthetic maxillary rehabilitation: a senior dental student clinical report.J Prosthet Dent. 2015; 113: 282-288
- Integrating conventional and CAD/CAM digital techniques for establishing canine protected articulation: a clinical report.J Prosthet Dent. 2016; 115: 515-519
- Evaluation of biogeneric design techniques with CEREC CAD/CAM system.J Adv Prosthodont. 2015; 7: 431-436
- Functionally-generated pathway theory, application and development in Cerec restorations.Int J Comput Dent. 2001; 4: 25-36
- A new concept for the integration of dynamic occlusion in the digital construction process.Int J Comput Dent. 2012; 15: 109-123
- Complete assessment of occlusal dynamics and establishment of a digital workflow by using target tracking with a three-dimensional facial scanner.J Prosthodont Res. 2019; 1: 120-124
- Virtual articulators and virtual facebow transfers: digital prosthodontics!!!.J Indian Prosthodont Soc. 2015; 15: 291
- Accuracy of dynamic virtual articulation: trueness and precision.J Prosthodont. 2019; 28: 436-443
- The rotation vs translation behavior during habitual opening and closing movements of the mandible and the relationship to movement paths of condylar points.Int J Comput Dent. 2020; 23: 17-26
- The effect of residual dentition on the dynamic adjustment of wear facet morphology on a mandibular first molar crown.J Prosthodont. 2021; 30: 351-355
- Design of occlusal wear facets of fixed dental prostheses driven by personalized mandibular movement.J Prosthet Dent. 03 February 2021; ([Epub ahead of print])https://doi.org/10.1016/j.prosdent.2020.09.055
- 4D clinical imaging for dynamic CAD.Int J Dent. 2013; 2013: 690265
- A reverse digital workflow by using an interim restoration scan and patient-specific motion with an intraoral scanner.J Prosthet Dent. 2021; 126: 19-23
- Comparison between occlusal errors of single posterior crowns adjusted using patient specific motion or conventional methods.Appl Sci. 2020; 10: 9140
- Accuracy of digital and conventional impression techniques and workflow.Clin Oral Investig. 2013; 17: 1759-1764
- Recent advances in dental optics - part I: 3D intraoral scanners for restorative dentistry.Opt Lasers Eng. 2014; 54: 203-221
- Influence of conventional and digital intraoral impressions on the fit of CAD/CAM-fabricated all-ceramic crowns.Clin Oral Investig. 2016; 20: 2403-2410
- Precision of maxillo-mandibular registration with intraoral scanners in vitro.J Prosthodont Res. 2020; 64: 114-119
- A technique for verifying the accuracy of the virtual mounting of digital scans against the actual occlusal contacts.J Prosthet Dent. 2019; 121: 729-732
- Deformation of the human mandible during simulated tooth clenching.J Dent Res. 1994; 73: 56-66
- Biomechanics and functional distortion of the human mandible.J Investig Clin Dent. 2015; 6: 241-251
- Three-dimensional evaluation of mandibular deformation during mouth opening.Int J Comput Dent. 2019; 22: 21-27
- Influence of clenching intensity on bite force balance, occlusal contact area, and average bite pressure.J Dent Res. 1999; 78: 1336-1344
- Tooth displacement in shortened dental arches: a three-dimensional finite element study.J Prosthet Dent. 2014; 111: 460-465
- Tooth displacement due to occlusal contacts: a three-dimensional finite element study.J Oral Rehabil. 2006; 33: 874-880
Article info
Publication history
Published online: August 21, 2021
Publication stage
In Press Corrected ProofFootnotes
L.L. and H.C. contributed equally to this work.
Supported by the National Natural Science Foundation of China (grant numbers 52035001); National Key R&D Program of China (grant numbers 2019YFB1706900); Capital Science and Technology Leading Talent Project (grant numbers Z191100006119022).
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
