360 degrees peri-implant, keratinised, soft-tissue grafting with stereolithographic-aided dressing plate

Use of digital technologies in fabrication of a custom healing stent after stage II implant surgery for advanced jaw reconstruction

This report describes the fabrication of a custom healing stent for second stage implant surgery in advanced jaw reconstruction. Postoperative computed tomography data and digital dental implant component libraries were used to create a custom healing stent to fit connected implant abutments without the need for a definitive abutment impression. After segmentation of the dental implants and importation into a computer-aided design software program, the appropriate digital implant componentry was aligned to the dental implants. The healing stent was then virtually designed, rapid prototyped, and then converted into a biocompatible and sterilizable material by using conventional laboratory methods. The methods presented offer clinicians the opportunity to insert a healing stent at second stage implant surgery with no need to create a stent or obtain an impression during the procedure.

The use of dental implants, cast bars and sleeve overdentures in oral cancer patients

Surgical resection of an oral tumour (and the associated free flap reconstruction) can significantly alter the oral anatomy. The lack of sulcus depth, alveolar ridge, presence of a mobile flap and limited tongue movement can make it impossible for patients to control a removable prosthesis. To help this cohort of patients, dental implants can be invaluable. The Oral Rehabilitation Team at Central Manchester University Dental Hospital have used dental implants to rehabilitate oral cancer patients for over thirty years. After their resective surgery, a number of patients were dentally rehabilitated with a laboratory-made, precious metal-alloy bar supported by at least four dental implants. A metal-alloy under-sleeve retained overdenture was then provided to fit over the milled bar. The majority of the 50 patients in this case series had tumours in the anterior floor of the mouth. It was noted that 76% of the patients received a rim resection and were reconstructed with a fasciocutaneous, soft tissue free flap. Six percent of patients received a segmental resection and were reconstructed with either a fibular or deep circumflex iliac artery free flap. The dental implants and sleeve overdentures had a survival rate of 100%. None of the dentures lost retention, implying that the frictional grip between the overcasting and the milled bar was sufficient to appease the retention demands of this cohort. However, 10% of patients encountered complications. This would suggest a success (or complication free) rate of 90% for this cohort of 50 oncology patients. This would still imply that milled bars/sleeve overdentures carry a relatively low maintenance burden and may be a useful treatment option for oral cancer patients.

Soft tissue augmentation procedures at second-stage surgery: a systematic review

OBJECTIVES

The aim of this systematic review was to evaluate the efficacy of different soft tissue augmentation/correction methods in terms of increasing the peri-implant width of keratinized mucosa (KM) and/or gain of soft tissue volume during second-stage surgery.

MATERIALS AND METHODS

Screening of two databases, MEDLINE (PubMed) and EMBASE (OVID), and hand search of related articles, were performed. Human studies reporting on soft tissue augmentation/correction methods around submucosally osseointegrated implants during second-stage surgery up to July 31, 2015 were considered. Quality assessment of the selected full-text articles was performed according to the Cochrane collaboration's tool to assess the risk of bias.

RESULTS

Overall, eight prospective studies (risk of bias: high) and two case series (risk of bias: high) were included. Depending on the surgical technique and graft material used, the enlargement of keratinized tissue (KT) ranged between -0.20 and 9.35 mm. An apically positioned partial-thickness flap/vestibuloplasty (APPTF/VP) in combination with a free gingival graft (FGG) or a xenogeneic graft material (XCM) was most effective. Applying a roll envelope flap (REF) or an APPTF in combination with a subepithelial connective tissue graft (SCTG), mean increases in soft tissue volumes of 2.41 and 3.10 mm, respectively, were achieved. Due to the heterogeneity of study designs, no meta-analysis could be performed.

CONCLUSIONS

Within the limitations of this review, regarding the enlargement of peri-implant KT, the APPTF in the maxilla and the APPTF/VP in combination with FGG or XCM in the lower and upper jaw seem to provide acceptable outcomes. To augment peri-implant soft tissue volume REF in the maxilla or APPTF + SCTG in the lower and upper jaw appear to be reliable treatment options.

CLINICAL RELEVANCE

The localization in the jaw and the clinical situation are crucial for the decision which second-stage procedure should be applied.

Computerized tomography, stereolithography and dental implants in the rehabilitation of oral cancer patients

As survival rates improve it is important to consider the quality of life for oral cancer patients post-treatment. The primary goal is removal of the tumour, however, with a gradual increase in survival rates, post-operative rehabilitation is now becoming increasingly important. Specialists in restorative dentistry, along with oral and maxillofacial surgeons, general dental practitioners and other members of the multidisciplinary team play a vital role in planning treatment for, and rehabilitating, these patients. This paper presents a case series to show how recent advances in computerized tomography (CT) and the use of stereolithographic models can help in the rehabilitation of oral cancer patients.

CLINICAL RELEVANCE

The principles discussed can also be applied to other patients undergoing dental implant treatment to help plan and carry out treatment and improve the quality of peri-implant tissues.