Outcomes of preformed metal crowns placed with the conventional and Hall techniques: A systematic review and meta‐analysis

Abstract

Background Preformed metal crowns (PMCs) have been used to restore carious primary molars and have a high success and survival rate. There are two methods currently employed for PMC placement ‐ the conventional technique (CT) and Hall technique (HT). Aim This systematic review aims to compare the outcomes of PMCs placed using the CT and HT. Design This systematic review was conducted according to the Preferred Reporting Items for Systematic Review and Meta‐analysis statement. A literature search of five databases was performed up to 23 August 2022. Clinical studies comparing carious primary molars restored with PMCs using either technique with a minimum 12‐month follow‐up were included. Risk of bias (RoB) assessment was performed using the National Institutes of Health Quality Assessment tool. Results Five articles met the inclusion criteria, and four were included for meta‐analysis. The 12‐ and 24‐month success and survival rates were above 85% for both groups, with no significant differences shown at 12 and 24 months. The HT requires a shorter treatment duration, is more cost‐effective and has a high level of acceptability among parents when compared to the CT. Four articles were rated fair, and one article was rated good in the RoB assessment. Conclusion Greater consideration may be given towards using the HT as part of standard treatment procedures in managing carious primary molars. Future studies should standardise reporting of outcomes to facilitate a more homogeneous pool of data for future meta‐analysis.

Use of the Hall Technique by dentists in East China: A questionnaire‐based cross‐sectional survey

“…The usage of the HT, however, varied among different studies. Compared with the high usage in the UK (96%), 8 our study and the study in the United States reported that less than half of the respondents used the HT 18 . Moreover, only 5.7% of the respondents from Germany had used the HT 22 .…”

“…Compared with the high usage in the UK (96%), 8 our study and the study in the United States reported that less than half of the respondents used the HT. 18 Moreover, only 5.7% of the respondents from Germany had used the HT. 22 The high usage of the HT in the UK may be because the HT was introduced to the undergraduate paediatric dentistry curriculum before 2010.…”

“…Previous evidence reported similar effectiveness of the HT with PMCs and even greater longevity than conventional restorations 13–17 . Moreover, the HT requires a shorter treatment duration, is more cost‐effective, and has a high level of acceptability among parents 16,18 . The HT is now regarded as one of several biological management options for carious primary molars and is widely used among dentists across the UK, 9 New Zealand, 13 and Australia 19 …”

“…[13][14][15][16][17] Moreover, the HT requires a shorter treatment duration, is more cost-effective, and has a high level of acceptability among parents. 16,18 The HT is now regarded as one of several biological management options for carious primary molars and is widely used among dentists across the UK, 9 New Zealand, 13 and Australia. 19 Despite recommendations and evidence, the HT is not broadly applied around the world.…”

Reasons for Crown Failures in Primary Teeth: A Systematic Review and Meta-Analysis (Preprint)

“…Since the publication of this systematic review, several RCTs have been published, and including these additional articles to arrive at an updated systematic review is a key objective of the article presented herein. Several systematic reviews have also reported on the efficacy of individual restorative materials such as stainless steel, zirconia, and prefabricated crowns [9][10][11]. As an addition to this accruing body of literature, the systematic review reported herein presents a qualitative assessment of crown retention rates and the impact of technical and biological factors on the overall success and acceptability of crowns for the primary tooth.…”