International Journal of Dentistry Research 2024; 9(2): 46-48 ;   DOI:10.31254/dentistry.2024.9204

Research Article

Analysis of Resistance Form of Molar Crown Preparations for Full-Coverage Porcelain Fused to Metal Crowns: A Prospective Study at The University of Ghana Dental School

Stephen Ekow Ankoh¹ , Patrick Caldicock Ampofo¹ , Sandra Ama Hewlett¹ , Ebenezer Anno Nyako¹ , Tom AKuetteh Ndanu² , Akua Boakyewaa Konadu¹ , Ruby Yayra Goka¹ , Nana Frimpomaa Adu-Ampomah^1,3 , Gladia Toledo Mayari Yabang⁴ , Neil Quartey Papafio⁵

Stephen Ekow Ankoh,Patrick Caldicock Ampofo,Sandra Ama Hewlett,Ebenezer Anno Nyako,Tom AKuetteh Ndanu,Akua Boakyewaa Konadu,Ruby Yayra Goka,Nana Frimpomaa Adu-Ampomah,Gladia Toledo Mayari Yabang,Neil Quartey Papafio

1. Department of Restorative Dentistry, University of Ghana Dental School, Accra, Ghana
2. Department of Community Dentistry, University of Ghana Dental School, Accra, Ghana
3. Dental department, Adabraka Polyclinic, Accra, Ghana
4. Department of Orthodontics and Paedodontics, University of Ghana Dental School, Accra, Ghana
5. Department of Dental Biomaterial Sciences, University of Ghana Dental School, Accra, Ghana

*Author to whom correspondence should be addressed.

Received: 25th April, 2024 / Accepted: 27th July, 2024 / Published : 30th August, 2024

Abstract

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Background: A good molar crown preparation with adequate resistance form for a porcelain fused to metal (PFM) crown should have a minimum height of 4mm, a maximum width of 10mm and a height-to-width ratio of at least 0.4. Aims and Objectives: To determine whether the molar crown preparations for full-coverage PFM crowns made by Resident dentists at the University of Ghana Dental School (UGDS) meet the recommended requirements for resistance form. Study design: This is a cross-sectional study to analyse the resistance form of molar crown preparation of patients scheduled for fullcoverage PFM crown. Materials and Methods: This was a prospective study to analyse the height, width, and height towidth ratio (some of the intrinsic factors of resistance form) of 77 molar crown preparations. The height, width, and height-to-width ratio of each molar die were determined using the Exocad software. A descriptive summary of the various heights, widths and height-to-width ratio were summarized as means and their standard deviations. Chi-square test was used to compare the acceptability levels of the variables with their respective recommended clinically acceptable values. Results: The mean height and mean width of all the molar dies were 3.3±0.8mm and 10.1±1.1mm respectively. The mean height-to-width ratio of all the molar dies was 0.3±0.1. Only 19.5% of the dies were able to achieve the recommended height, and 18.2% of the molar dies had a minimum height-to-width ratio of 0.4 which is required for molar crown preparation. Conclusion: The findings of this study did not meet most of the recommended clinically acceptable values of the resistance form of molar crown preparations. The authors recommend organising in-service training or continuous professional development for clinicians who lack the skills in crown preparation in order to perfect their skills to create acceptable prepared crowns with adequate resistance form and to conduct a longitudinal clinical study to assess the
crown preparations and the longevity of their fabricated crowns.

Keywords

Resistance form, Height, Width, Molar tooth, Porcelain fused to metal crown.

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