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Optimization of Prosthodontic Computer-Aided Designed Models: A Virtual Evaluation of Mesh Quality Reduction Using Open Source Software

Farook TH, Barman A, Abdullah JY, Jamayet NB

J Prosthodont, 2021 Jun;30(5):420-429.
PMID: 33200429 DOI: 10.1111/jopr.13286

PURPOSE: Mesh optimization reduces the texture quality of 3D models in order to reduce storage file size and computational load on a personal computer. This study aims to explore mesh optimization using open source (free) software in the context of prosthodontic application.
MATERIALS AND METHODS: An auricular prosthesis, a complete denture, and anterior and posterior crowns were constructed using conventional methods and laser scanned to create computerized 3D meshes. The meshes were optimized independently by four computer-aided design software (Meshmixer, Meshlab, Blender, and SculptGL) to 100%, 90%, 75%, 50%, and 25% levels of original file size. Upon optimization, the following parameters were virtually evaluated and compared; mesh vertices, file size, mesh surface area (SA), mesh volume (V), interpoint discrepancies (geometric similarity based on virtual point overlapping), and spatial similarity (volumetric similarity based on shape overlapping). The influence of software and optimization on surface area and volume of each prosthesis was evaluated independently using multiple linear regression.
RESULTS: There were clear observable differences in vertices, file size, surface area, and volume. The choice of software significantly influenced the overall virtual parameters of auricular prosthesis [SA: F(4,15) = 12.93, R2 = 0.67, p < 0.001. V: F(4,15) = 9.33, R2 = 0.64, p < 0.001] and complete denture [SA: F(4,15) = 10.81, R2 = 0.67, p < 0.001. V: F(4,15) = 3.50, R2 = 0.34, p = 0.030] across optimization levels. Interpoint discrepancies were however limited to <0.1mm and volumetric similarity was >97%.
CONCLUSION: Open-source mesh optimization of smaller dental prostheses in this study produced minimal loss of geometric and volumetric details. SculptGL models were most influenced by the amount of optimization performed.

Matched MeSH terms: Prosthodontics*
Fulltext Posterior teeth mesialization with mini-implants in an oligodontia patient

Wey, M.C., Wu, C.L., Wong, W.K., Zamri, R., Hagg, U.

Malaysian Dental Journal, 2008;29(2):113-118.
MyJurnal

A case report of a 16 year old male oligodontia patient who presented with a Class I malocclusion on a skeletal I base. He had multiple missing teeth of upper lateral incisors and all premolars except for lower right first premolar. Treatment involved fixed appliance with the aid of mini-implants to mesialize posterior teeth in order to reduce the number of prosthodontic replacement of the remaining missing teeth planned for the future. The application of the mini-implants in the sequence of treatment is presented

Matched MeSH terms: Prosthodontics
Fulltext What dental students think about fixed prosthodontics e-Learning (FPeL)

Marlynda, A., Natasya, A.T., Salleh M.A.M.

Malaysian Dental Journal, 2010;31(1):20-24.
MyJurnal

Introduction: Nowadays, there is a worldwide trend for universities to utilize the benefits of e-learning as a mechanism to facilitate improvements in teaching and learning. Purpose: The aim of this study is to evaluate the effectiveness of using e-learning in the teaching of fixed prosthodontic course i.e. FPeL.

Materials and Methods: This was a retrospective analysis of questionnaire data, collected from fourth and fifth year dental undergraduates at the Faculty of Dentistry, National University of Malaysia (Universiti Kebangsaan Malaysia, UKM). For fixed prosthodontics (FP), all students had received a series of traditional classroom lectures, seminars, video demonstration, preclinical and Fixed Prosthodontics e-Learning or FPeL in semester 1 and 2 during their 4th year. The questionnaire of 4 sections was administered after the students completed fixed prosthodontics course.

Results: Questionnaires were returned by 136 students (80.9% response rate). Unfortunately, the response rate dropped 12.4% when only 115 students accessed and used the FPeL (68.5%). Majority of FPeL users felt PFeL was beneficial to their learning in the fixed prosthodontic course. PFeL users recommended printable version with detailed explanations, illustrated with more photos and with addition of references.

Conclusions: PFeL assisted users in the learning process of fixed prosthodontics.

Matched MeSH terms: Prosthodontics
Fulltext Prosthodontic considerations in the management of oligodontia in growing patients

Yew, Hsu Zenn

Malaysian Dental Journal, 2011;32(1):21-27.
MyJurnal

Congenitally missing teeth creates significant challenges to the clinicians in both diagnosis and management. The need for interdisciplinary involvement is essential for optimum dental care. The purpose of this clinical report is to describe an interdisciplinary management of a 15-year-old adolescent presented with non-syndromic oligodontia. The principle of management is presented with special emphasis on prosthodontic aspects. Various restorative treatment modalities specified for oligodontia patients are outlined.

Matched MeSH terms: Prosthodontics
Fulltext An audit of the turnaround time of fixed prosthodontics cases in the ceramic laboratory

Khan, A., Mohd Noor, N.S., Sukumaran, P., Sheikh Aladin, S.H.A., Wai Ying, Y.

Ann Dent, 2016;22(2):1-8.
MyJurnal

This clinical audit is aimed to provide an insight into the performance of dental technicians in rendering
fixed prosthodontics services at Faculty of Dentistry, University of Malaya. A retrospective audit was
carried out between 1st of November 2014 and 31st January 2015 using data derived from records and
monthly returns of the technicians, which are kept at the ceramic laboratory. Retrospective data on
cases of diagnostic wax-ups, full metal crowns, metal ceramic crowns, all ceramic crowns and bridges
that were sent to ceramic laboratory for fabrication from 1st of September 2013 to 31st of August 2014
was systematically extracted from the record and tabulated categorically in SPSS version 22.0. The
turnaround time in workings day for diagnostic wax-ups and the prostheses was calculated by deducting
exit date from entry date. Subsequently, the turnaround time and the complexity of cases were categorized
accordingly. The association of turnaround time and the complexity of the cases was analysed using
Fisher Exact test with p value < 0.05. Within this time frame, a total of 102 cases of diagnostic waxups,
36 cases of crown and 18 cases of bridges were fabricated. 57.8% of diagnostic wax-ups were
completed within 3 days. 100% of 1 unit crown were completed within 7 days and 94.4% of bridges were
completed within 14 days. There was a significant association of turnaround time and the complexity of
the cases for diagnostic wax-ups and crowns with p value

Matched MeSH terms: Prosthodontics
Fulltext Maxillary and mandibular anterior crown width/height ratio and its relation to various arch perimeters, arch length, and arch width groups

Shahid F, Alam MK, Khamis MF

Eur J Dent, 2016 3 2;9(4):490-499.
PMID: 26929686 DOI: 10.4103/1305-7456.172620

OBJECTIVE: To investigate the maxillary and mandibular anterior crown width/height ratio and its relation to various arch perimeters, arch length, and arch width (intercanine, interpremolar, and intermolar) groups.
MATERIALS AND METHODS: The calculated sample size was 128 subjects. The crown width/height, arch length, arch perimeter, and arch width of the maxilla and mandible were obtained via digital calliper (Mitutoyo, Japan). A total of 4325 variables were measured. The sex differences in the crown width and height were evaluated. Analysis of variance was applied to evaluate the differences between arch length, arch perimeter, and arch width groups.
RESULTS: Males had significantly larger mean values for crown width and height than females (P ≤ 0.05) for maxillary and mandibular arches, both. There were no significant differences observed for the crown width/height ratio in various arch length, arch perimeter, and arch width (intercanine, interpremolar, and intermolar) groups (P ≤ 0.05) in maxilla and mandible, both.
CONCLUSIONS: Our results indicate sexual disparities in the crown width and height. Crown width and height has no significant relation to various arch length, arch perimeter, and arch width groups of maxilla and mandible. Thus, it may be helpful for orthodontic and prosthodontic case investigations and comprehensive management.

Matched MeSH terms: Prosthodontics
Fulltext Unsplinted metal reinforced implant retained overdenture for an edentulous arch

Nur Hafizah Kamar Affendi, Nor Faharina Bt Abd Hamid

Compendium of Oral Science, 2017;4(1):40-46.
MyJurnal

Objective: This article discuss a clinical case of implant retained overdenture as a predictable and effective treatment for completely edentulous arch. Material and method: A patient with an edentulous maxilla and periodontically compromised teeth in the mandible was treated using a specific surgical and prosthodontic protocol. Patient was followed for 12 months postloading. Result: The implants are still osseointegrated and able to maintain healthy mucosa surrounding implants. The patient have verbally indicated that she is satisfied with the design that gives her comfort and function. Conclusions: It appears that unsplinted freestanding implants can be used as a predictable treatment for edentulous arch.

Matched MeSH terms: Prosthodontics
Fulltext Esthetic Clasp Cast Partial Denture

Turagam N, Mudrakola DP, Yelamanchi RS, Deepthi M, Natarajan M

J Int Soc Prev Community Dent, 2019 02 14;9(1):94-98.
PMID: 30923701 DOI: 10.4103/jispcd.JISPCD_220_18

Denture esthetics as defined by Glossary of prosthodontics terms the effect produced by a dental prosthesis that affects the beauty and attractiveness of the person. [1] Removable partial dentures (RPDs) are the widely accepted and treatment of choice for most cases as it is both effective and affordable. Partially edentulous treatment planning includes both esthetics and masticatory function. A prosthesis that is highly esthetic will improve patient's motivation and acceptance. It is a very wrong notion to expect that patients will tolerate unesthetic partial dentures because good masticatory capability has been achieved. Esthetics plays a vital role in the success of partial dentures, and the length and mobility of the patient's lips play a significant role in achieving it. [2] Patients with short lips or highly mobile lips pose problems as esthetics are compromised because most clasp arms, denture borders, and other components will show when the patient smiles or speaks. [3] RPDs can easily look artificial; hence, special emphasis should aim toward restoring function, phonetics, esthetics with a long-term benefits which requires meticulous attention during fabrication. This case reports is an esthetic clasp designed for a cast partial denture for a young girl for esthetic and function.

Matched MeSH terms: Prosthodontics
Fulltext Blending the appearance of all-ceramic crowns in fluo-rosis condition with direct chair-side technique

Siti Mariam Ab Ghani, Ahmad Syahir Ahmad Zu Saifudin, Muhammad Aliff Ikram Noor Zari, Teh Adilla Mustaza

Compendium of Oral Science, 2015;2(1):47-51.
MyJurnal

Dental fluorosis incidence had been reported to be affecting children widely, especially in water-fluoridated ar-ea. As these children grow into young adults, perceived aesthetic problems arise mainly due to their concern with generalized mottled and stained teeth appearance. Fixed prosthodontics treatment involving single anterior tooth in patients with generalized fluorosis condition had been found challenging due to aesthetic restorability to blend with fluorosis condition. Clinical considerations: A simplified procedural direct chair-side technique of mimicking fluorosis condition onto anterior all-ceramic crowns are discussed in this paper. The mimicked fluoro-sis is reversible and has the opportunity to be adjusted according to the patient’s fluorosis condition thus hinder-ing the need to redo the crown in the future. Conclusions: The appearance of anterior all-ceramic crowns with direct chair-side staining technique provided blended and harmonized well with the dental fluorosis condition in both patients thus, giving natural looking smile.

Matched MeSH terms: Prosthodontics
Fulltext Students perception and satisfactory level in preclinical fixed prosthodontic teaching: post and core

Marlynda Ahmad, Natasya Ahmad Tarib

Malaysian Dental Journal, 2008;29(2):128-134.
MyJurnal

Introduction: Preclinical teaching using simulation is very beneficial in training dental graduates. The use of laboratory simulation for its undergraduate training during the preclinical years has been used in dental education. Purpose: The aim of this study was to evaluate student’s perception, self evaluation and satisfactory level in preparing duralay burn-out post and core in preclinical fixed prosthodontics sessions.

Materials and Methods: The participants comprised of 104 fourth year dental undergraduates in the Faculty of Dentistry Universiti Kebangsaan Malaysia. The students had undergone preclinical session for endodontics during the 3rd year and had already completed root canal treatment on single rooted tooth. The same tooth was used for preclinical post and core preparation. The gutta percha was partially removed and the root canal was prepared. They then proceeded with the preparation of duralay build-up/pattern based on the lecture, video demonstration and manual given. Once completed and satisfied with their work, students were asked to answer the questionnaires in the simulation manual.

Results: Student response rate was 88.46% (92/104). Majority of the students were satisfied with their canal preparation, with about 5mm gutta percha left apically, appropriately shaped canal with sufficient retention and resistance form. They also thought that the surface of the duralay was good with no voids. With regards to the coronal preparation, majority of them incorporated ferrule effect and prepared preliminary crown preparation. More than half of the students claimed the level of difficulty of this procedure was moderate. Furthermore, majority of them said that the lecture and the preclinical manual were sufficient and helpful. The help from the supervisors was also benefit in preparing duralay burnout post and core.

Conclusions: From this study, majority of fourth year dental students could perform appropriate canal preparation as well as duralay pattern post and core. Only one student did not feel competent and confident in doing canal preparation and duralay pattern post and core. Our teaching methods and aids were proven to help them in preparing these tasks.

Matched MeSH terms: Prosthodontics
Fulltext Floating teeth appearance: A radiographic dilemma

Rahman NA, Harun MH, Rahman SA, Mohammad NSA

J Taibah Univ Med Sci, 2020 Apr;15(2):160-165.
PMID: 32368214 DOI: 10.1016/j.jtumed.2020.02.005

Gorham disease (GD) is an extremely rare disorder that is characterised by massive osteolysis of the affected bone with unknown aetiology and an unpredictable prognosis. Additionally, no standard treatment is available for GD. This article describes a case report of a 61-year-old Malay woman who was diagnosed with GD of the anterior mandible without a prior history of trauma. She presented with pain and mobility of the dentoalveolar segment for 3 months. The radiographic findings showed "floating teeth" with widening of the periodontal ligament space and localized area of bony destruction. Histopathologically, there was proliferation of numerous dilated endothelial-lined channels within the intertrabecular tissue. Some areas of bone were replaced by fibrous connective tissue giving rise to the appearance of a benign fibroosseous lesion. The patient was managed with simple removal of the affected bone segment under local anaesthesia, followed by prosthodontic rehabilitation. Healing of the surgical site was uneventful, and no recurrence was reported at the 3-year follow-up.

Matched MeSH terms: Prosthodontics